# Gurukul Technicals Institute: every public page > Gurukul Technicals Institute (GTI) is a science and computer education institute in Delhi, India: courses at the head office and at authorised member centres, science project kits, and free learning material. Head office A-10, Chief Commissioner Colony, opposite Rana Pratap Bagh, Delhi 110007. Phone 011 2721 1512. ## Main pages - [Home](https://engineergurukul.com/) - [Courses](https://engineergurukul.com/courses/): every course family and course - [Learning paths](https://engineergurukul.com/courses/paths/) - [Store: projects and kits](https://engineergurukul.com/store/) - [Verify a certificate](https://engineergurukul.com/verify-certificate/) - [Contact](https://engineergurukul.com/contact/) - [Resources](https://engineergurukul.com/resources/) ## Courses - [Computer & Office Skills](https://engineergurukul.com/courses/computer-office/): Use a computer with confidence at home and at work: documents, spreadsheets, the internet and fast, accurate typing. - [Accounting & Business Software](https://engineergurukul.com/courses/accounting/): Keep the books of a business on the computer, including GST, in the accounting software most Indian offices use. - [Programming & Web Development](https://engineergurukul.com/courses/programming/): Write programs and build web pages, from the first lines of C to databases and IT security. - [Design & Digital Skills](https://engineergurukul.com/courses/design/): Lay out posters, cards and documents for print with desktop publishing tools. - [Hardware & Networking](https://engineergurukul.com/courses/hardware/): Assemble, maintain and repair computers, set up networks and repair mobile phones. - [School Skills](https://engineergurukul.com/courses/school-skills/): Skills that go beside school: coding with Scratch, mental maths, handwriting, speaking with confidence, staying safe online and using AI sensibly. - [Other Programmes](https://engineergurukul.com/courses/other/): Communication and vocational courses offered alongside computer education. - [ADCA, advanced computer applications](https://engineergurukul.com/courses/computer-office/adca/): ADCA at Gurukul Technicals Institute, Delhi: computer fundamentals, Windows and the internet, Word, Excel, PowerPoint and typing, with study books and practice tests. - [Basic computer and the internet](https://engineergurukul.com/courses/computer-office/basic-computer/): A basic computer course for first-time users: parts of a computer, Windows, files and folders, browsing, email, online safety and typing practice, in Delhi and at member centres. - [MS Office](https://engineergurukul.com/courses/computer-office/ms-office/): MS Office course at Gurukul Technicals Institute: Word letters and reports, Excel formulas, IF and VLOOKUP, charts, and PowerPoint presentations, with timed practice tests. - [Typing in English, Hindi and regional languages](https://engineergurukul.com/courses/computer-office/typing/): Touch typing course in English, Hindi and regional languages: posture, the home row, the finger-to-key map, accuracy before speed, measuring WPM and an online typing test. - [Data entry and office automation](https://engineergurukul.com/courses/computer-office/data-entry-office/): Data entry and office automation: accuracy and speed, spreadsheets with data validation, forms, templates, mail merge and shortcuts that remove repeated work, with a study book and practice tests. - [Advanced Excel and data analysis](https://engineergurukul.com/courses/computer-office/advanced-excel/): Advanced Excel and data analysis: cleaning data, tables, XLOOKUP and INDEX/MATCH, SUMIFS and COUNTIFS, pivot tables, charts, what-if analysis and a simple dashboard, with practice tests. - [Computer basics for absolute beginners and seniors](https://engineergurukul.com/courses/computer-office/computer-basics-seniors/): A patient computer and smartphone course for seniors and absolute beginners: mouse and keyboard, apps, photos, WhatsApp, video calls, email, UPI and OTP safety, and settings for comfort. - [Tally with GST](https://engineergurukul.com/courses/accounting/tally-gst/): Tally with GST course in Delhi: the golden rules of accounting, companies, ledgers, vouchers and stock items in TallyPrime, GST invoices and reports, plus Excel for accounts. - [Basic accounting and bookkeeping](https://engineergurukul.com/courses/accounting/accounting-basics/): Basic accounting and bookkeeping: the accounting equation, golden rules, journal, ledger, cash book, trial balance, final accounts, bank reconciliation and the idea of GST, with worked examples in rupees. - [C and C++](https://engineergurukul.com/courses/programming/c-cpp/): C and C++ course: data types, loops, arrays, functions, pointers and files in C, then classes, inheritance, virtual functions, templates and the STL in C++. - [Java](https://engineergurukul.com/courses/programming/java/): Java course at Gurukul Technicals Institute: the JDK and JVM, data types, loops, arrays, strings, classes, inheritance, interfaces, exceptions, ArrayList and HashMap. - [HTML and web design](https://engineergurukul.com/courses/programming/web-design/): HTML and web design course: HTML5 structure, text, links, images, tables and forms, semantic elements, CSS selectors, the box model, Flexbox, Grid and responsive layouts. - [Python programming](https://engineergurukul.com/courses/programming/python/): Python programming for beginners: print and input, variables, decisions, loops, lists and dictionaries, functions, files, errors and a small project, with a study book and practice tests. - [JavaScript and interactive web pages](https://engineergurukul.com/courses/programming/javascript-web/): JavaScript for web pages: variables, functions, arrays and objects, the DOM, events and form validation, plus HTML and CSS revision, with study books and practice tests. - [WordPress website building](https://engineergurukul.com/courses/programming/wordpress/): WordPress website building: domains and hosting in general terms, the dashboard, pages and posts, the block editor, themes, menus, images, plugins, forms, security, backups and launching the site. - [Mobile apps with MIT App Inventor](https://engineergurukul.com/courses/programming/app-inventor/): Mobile apps with MIT App Inventor: the Designer and Blocks editors, buttons and screens, events and variables, lists, the Canvas, sensors, TinyDB storage, testing on a phone and building the APK. - [Web development, networking, databases and IT security (class 10 pass)](https://engineergurukul.com/courses/programming/it-diploma/): IT programme for class 10 pass students: HTML and CSS web pages, MySQL databases and SQL, computer networking and cyber security, with study books and practice tests. - [DTP, desktop publishing](https://engineergurukul.com/courses/design/dtp/): DTP course in Delhi: page layout, typography, RGB and CMYK colour, print resolution, vector and raster graphics, CorelDRAW tools and print-ready PDFs. - [CorelDRAW](https://engineergurukul.com/courses/design/coreldraw/): CorelDRAW course at Gurukul Technicals Institute: the workspace and tools, shaping and arranging objects, typography, CMYK colour, and a visiting card and poster ready for print. - [Graphic design with Canva and Photoshop basics](https://engineergurukul.com/courses/design/canva-design/): Graphic design with Canva and Photoshop basics: alignment, contrast, colour and fonts, posters, cards and social posts, editing photographs, and preparing files for print and screen. - [Video editing](https://engineergurukul.com/courses/design/video-editing/): Video editing basics: shots and framing, storyboards, organising clips, the timeline, cuts and transitions, titles, audio, colour and exporting, with a study book and practice tests. - [Digital marketing basics](https://engineergurukul.com/courses/design/digital-marketing/): Digital marketing basics: the customer journey, websites and search, social media planning, email and WhatsApp messages, simple paid ads and measuring results, with honest advertising practice. - [Photography and photo editing](https://engineergurukul.com/courses/design/photography/): Photography and photo editing with a phone or a camera: light, the exposure triangle, focus, composition, portraits and product photos, editing with free tools, file formats, backups and sharing. - [3D design with Tinkercad](https://engineergurukul.com/courses/design/tinkercad-3d/): 3D design with Tinkercad: the workplane, shapes and holes, moving and aligning, measuring in millimetres, designing a keychain, a pencil holder and a house, preparing STL files for 3D printing and fixing mistakes. - [Hardware and networking](https://engineergurukul.com/courses/hardware/hardware-networking/): Hardware and networking course in Delhi: motherboard, CPU, RAM, storage, SMPS, assembling a PC, BIOS, Windows and drivers, LAN cables, IP addresses and troubleshooting. - [PC maintenance](https://engineergurukul.com/courses/hardware/pc-maintenance/): PC maintenance course: the parts inside a PC, RAM and storage, BIOS, installing Windows and drivers, finding faults, preventive care, and keeping the computer secure. - [Mobile repairing](https://engineergurukul.com/courses/hardware/mobile-repairing/): Mobile repairing course in Delhi: parts inside a smartphone, repair tools and bench safety, lithium-ion batteries, charging and display faults, software resets and data privacy. - [Basic electronics](https://engineergurukul.com/courses/hardware/basic-electronics/): Basic electronics: electrical safety, reading circuit symbols, resistors, capacitors, diodes and LEDs, transistors, the 555 timer, the multimeter, breadboards and soldering, with a study book and practice tests. - [Drone and IoT basics](https://engineergurukul.com/courses/hardware/iot-drone/): Drone and IoT basics: sensors and microcontrollers, Wi-Fi and dashboards, how a multirotor flies, drone parts, battery safety and the rules to check before flying, with a study book and practice tests. - [Robotics, KG to class 2](https://engineergurukul.com/courses/robotics/robotics-kg-2/): Robotics for KG to class 2 at Gurukul Technicals Institute, Delhi: short, hands-on sessions building simple circuits and moving models with lights, switches, magnets and motors. - [Robotics, class 3 to 8](https://engineergurukul.com/courses/robotics/robotics-3-8/): Basic robotics for class 3 to 8 at Gurukul Technicals Institute, Delhi: a fire alarm, a robotic car, a crane and more, built from loose components, then first Arduino projects. - [Robotics, class 8 to 12](https://engineergurukul.com/courses/robotics/robotics-8-12/): Advanced robotics for class 8 to 12 in Delhi: line follower and obstacle robots, L293D motor drivers, PWM, Arduino sensors, DTMF mobile control and embedded systems. - [Scratch coding for kids](https://engineergurukul.com/courses/school-skills/scratch-coding/): Scratch coding for children: sprites and the stage, motion, loops, decisions, variables, messages, a simple game and sharing projects safely, with a friendly study book and practice quizzes. - [Abacus and Vedic maths](https://engineergurukul.com/courses/school-skills/abacus-vedic-maths/): Abacus and Vedic maths for children: place value on the abacus, addition and subtraction, mental imagery, multiplication shortcuts, squares, base methods and checking answers. - [Handwriting and calligraphy](https://engineergurukul.com/courses/school-skills/handwriting-calligraphy/): Handwriting and calligraphy: posture and grip, letter shapes and spacing in English and Devanagari, speed with legibility, then brush-pen and italic calligraphy strokes and layouts. - [Public speaking and confidence](https://engineergurukul.com/courses/school-skills/public-speaking/): Public speaking and confidence: handling stage fear, voice and body language, structuring a speech, storytelling, notes and slides, debate, group discussion and feedback. - [Cyber safety for students](https://engineergurukul.com/courses/school-skills/cyber-safety/): Cyber safety for school students: strong passwords, privacy and digital footprint, cyberbullying, games and in-app purchases, scams, fake news, screen time and who to tell when something goes wrong. - [AI and ChatGPT literacy for students](https://engineergurukul.com/courses/school-skills/ai-literacy/): AI and ChatGPT literacy for students: how AI and chatbots work, writing prompts, checking facts, bias, privacy, deepfakes and using AI honestly for learning, with a study book and practice quizzes. - [Game design basics](https://engineergurukul.com/courses/school-skills/game-design/): Game design basics for students: goals, rules and the game loop, a one-page design document, characters and levels, scoring and win states, building in Scratch, the ideas behind an engine such as Godot, playtesting and p - [Maths olympiad foundation (class 6 to 8)](https://engineergurukul.com/courses/school-skills/maths-olympiad/): Maths olympiad foundation for class 6 to 8: number patterns, divisibility and primes, fractions and ratio, algebra thinking, geometry, counting, logic puzzles, speed and work, and exam strategy, with worked examples. - [English for kids (class 1 to 5)](https://engineergurukul.com/courses/school-skills/english-kids/): English for kids in class 1 to 5: sounds and letters, spelling simple words, nouns, verbs and adjectives, simple sentences, reading short passages aloud, talking about yourself, describing pictures, rhymes and polite wor - [Creative writing for students](https://engineergurukul.com/courses/school-skills/creative-writing/): Creative writing for school students: finding ideas, characters, setting, plot, dialogue, show-don’t-tell, poems, diary entries and letters, editing your own work, and writing honestly, with grammar revision. - [Financial literacy for teenagers](https://engineergurukul.com/courses/school-skills/financial-literacy/): Financial literacy for teenagers: needs and wants, budgeting, saving and an emergency fund, banks and UPI, simple and compound interest, inflation, goals, scams, OTP fraud and loan-app traps, GST on a bill and first earn - [Science fair skills](https://engineergurukul.com/courses/school-skills/science-fair-skills/): Science fair skills for school students: choosing a question, the scientific method, planning and safety, building a working model, testing and recording, graphs, the project report, the display board, the presentation a - [Spoken English](https://engineergurukul.com/courses/other/spoken-english/): Spoken English course: greetings, everyday conversation, pronunciation, office and telephone English, job interviews and group discussions, with English grammar practice. - [Shorthand](https://engineergurukul.com/courses/other/shorthand/): Shorthand course at Gurukul Technicals Institute: writing by sound, strokes and vowel signs, short forms, graded dictation and transcription, with English grammar and typing. - [Computer teacher training](https://engineergurukul.com/courses/other/teacher-training/): Computer teacher training at Gurukul Technicals Institute: computer fundamentals, Windows and the internet, Word, Excel and PowerPoint, for people who want to teach. - [Beautician](https://engineergurukul.com/courses/other/beautician/): Beautician course at Gurukul Technicals Institute: salon hygiene, skin types, hair care, manicure and pedicure, makeup, threading, waxing, the patch test and first aid. - [Dress design](https://engineergurukul.com/courses/other/dress-design/): Dress design course at Gurukul Technicals Institute: tailoring tools, fabrics, the sewing machine, body measurements, pattern drafting, seams, hems and fashion illustration. ## Learning paths - [Computer basics to an office job](https://engineergurukul.com/courses/paths/computer-basics-to-office-job/): From the first click to the desk of a front office, data entry or admin assistant. - [Accounts assistant](https://engineergurukul.com/courses/paths/accounts-assistant/): From computer basics to keeping the books of a business in Tally, with GST. - [Zero to web developer](https://engineergurukul.com/courses/paths/zero-to-web-developer/): From a first web page to a WordPress site, and the databases and security behind websites. - [Python and data](https://engineergurukul.com/courses/paths/python-and-data/): From a first program to cleaning, summarising and querying data. - [Designer](https://engineergurukul.com/courses/paths/designer/): From design principles to print, photographs and video. - [Hardware and networking technician](https://engineergurukul.com/courses/paths/hardware-and-networking-technician/): From the parts of a PC to a working office network. - [Mobile repair technician](https://engineergurukul.com/courses/paths/mobile-repair-technician/): From safe electronics to a phone repair bench of your own. - [Kids: Scratch to Python to the web](https://engineergurukul.com/courses/paths/kids-scratch-to-python-to-web/): From snapping blocks together to writing real code and a first web page. - [School skills for exam confidence](https://engineergurukul.com/courses/paths/school-skills-for-exam-confidence/): Neat writing, fast maths, clear speaking and safe, sensible use of technology. - [Robotics: from circuits to Arduino and IoT](https://engineergurukul.com/courses/paths/robotics-from-circuits-to-arduino-and-iot/): From the first LED on a breadboard to a connected device and how a drone flies. - [Spoken English and interview readiness](https://engineergurukul.com/courses/paths/spoken-english-interview-readiness/): From everyday conversation to a confident interview and a tidy resume. - [Content creator](https://engineergurukul.com/courses/paths/content-creator/): Design, photographs, video and the marketing basics that help them be seen. - [Young learners: reading, writing and a first science project](https://engineergurukul.com/courses/paths/young-learners-foundation/): From the sounds of letters to a story of their own and a project on the exhibition table. - [Money sense: from pocket money to the books of a business](https://engineergurukul.com/courses/paths/financial-literacy-and-money-sense/): Budgets, banks and interest first, then the accounting and Excel behind a business. - [Teach at a computer centre](https://engineergurukul.com/courses/paths/computer-teacher/): From computer basics to teaching them: ADCA, typing and teacher training. ## Website pages - [About us](https://engineergurukul.com/about-us/): Gurukul Technicals Institute is a science and computer education institute in Delhi. Working projects and models with DIY kits and spares are what we make, and do it yourself is what we teach. - [Open a franchise centre](https://engineergurukul.com/franchise/): Run your computer centre as a member centre of Gurukul Technicals Institute. The Delhi head office supplies a member kit, study notes, exams and certificates for your students. - [Best out of waste project ideas for school, class 1 to 10](https://engineergurukul.com/best-out-of-waste-project-ideas/): Twenty-four best-out-of-waste ideas grouped by class, with the materials, what each one teaches, and the one working part that turns a craft project into a science model. - [How to choose a working model for a science exhibition](https://engineergurukul.com/how-to-choose-a-working-model-for-science-exhibition/): What judges score, how to match the model to your class and chapter, working versus static models, and a four-week plan from choosing the topic to the two-minute explanation. - [Class 12 physics investigatory project: how it is marked and how to present it](https://engineergurukul.com/class-12-physics-investigatory-project-guide/): The CBSE practical marks, what "investigatory" means, 25 topics grouped by unit with matching kits, the file format examiners expect, and the viva questions to prepare for. - [Robotics for kids: what age to start and what to learn at each age](https://engineergurukul.com/robotics-for-kids-what-age-to-start/): A parent guide to starting robotics: what a child can do at KG to Class 2, Class 3 to 8 and Class 8 to 12, what no-code, block coding and Arduino mean, and how to choose a class or a kit. - [For Class 3 to 8](https://engineergurukul.com/robotics-classes-class-3-to-8/): Basic robotics classes for Class 3 to 8 at Gurukul Technicals Institute, Delhi. Maximum practical, minimum theory: students learn basic electronics by building a working project in every session, from loose components, w - [For Class 8 to 12](https://engineergurukul.com/robotics-classes-class-8-to-12/): Advanced robotics and coding classes for Class 8 to 12 at Gurukul Technicals Institute, Delhi. Students move from basic electronics to Arduino programming and embedded systems, and build an autonomous robot along the way - [Robotics classes for kids in Delhi](https://engineergurukul.com/robotics-classes-in-delhi/): Hands-on robotics, Arduino and coding classes for kids from KG to Class 12 at the institute in Delhi, with weekday, weekend and summer batches and programmes for schools. - [For KG to Class 2](https://engineergurukul.com/robotics-classes-kg-to-class-2/): Robotics and coding classes for the youngest learners, KG to Class 2, at Gurukul Technicals Institute in Delhi. Sessions are short and hands-on: children build simple moving models with lights, switches, magnets and moto - [Robotics classes for schools](https://engineergurukul.com/robotics-classes-for-schools/): Gurukul Technicals Institute runs robotics and coding workshops inside schools in Delhi and nearby, from a one-day workshop to a weekly robotics programme for the whole year. ## Franchise guide - [Guide to opening a computer training centre](https://engineergurukul.com/franchise/guide/) - [Is a computer training centre right for you?](https://engineergurukul.com/franchise/guide/is-a-computer-centre-right-for-you/): An honest look at what running a computer training centre asks of you, who it suits, and the questions to answer before you spend anything. - [The member centre model: who does what](https://engineergurukul.com/franchise/guide/member-centre-model/): What the Delhi head office supplies, what you do as the centre owner, what you need to apply and how joining works, taken from the facts on the franchise page. - [Choosing a location and space for your centre](https://engineergurukul.com/franchise/guide/location-and-space/): How to choose where to open: footfall, size per seat, power, internet, seating, ventilation, signage and the checks to make before you sign a rent agreement. - [Computers and equipment checklist for a new centre](https://engineergurukul.com/franchise/guide/computers-and-equipment/): What to buy for a training centre: computers, new versus second-hand, UPS, printer, projector, Wi-Fi, furniture and spares, with advice on what to check before paying. - [Setting up the lab: layout, wiring, safety and light](https://engineergurukul.com/franchise/guide/setting-up-the-lab/): How to arrange the computer lab so every student can see the board, how to get the wiring done safely by an electrician, and how to plan lighting, airflow and a tidy look. - [Planning your first batches and timetable](https://engineergurukul.com/franchise/guide/first-batches/): How to build a timetable, choose batch sizes, use morning and evening slots, mix courses sensibly and keep records, so your first months run smoothly. - [Getting students: honest local marketing that works](https://engineergurukul.com/franchise/guide/getting-students/): Practical ways to fill your batches: demo classes, school tie-ups, WhatsApp, a Google Business profile, referrals, posters and the honest claims to make. - [Running a demo class that turns visitors into students](https://engineergurukul.com/franchise/guide/running-a-demo-class/): A step by step plan for a free demo class: who to invite, what to teach in 45 minutes, how to talk to parents, what to say about fees and how to follow up. - [Fees, receipts and bookkeeping for a training centre](https://engineergurukul.com/franchise/guide/fees-and-bookkeeping/): How to keep clear records of student fees, give receipts, track expenses, keep personal and business money apart and understand GST in general terms. - [Hiring and training instructors](https://engineergurukul.com/franchise/guide/hiring-and-training-instructors/): How to find, interview, train and keep good teachers: what to look for, a trial class, an induction, feedback, fair pay and the faculty certificates head office provides. - [Using the franchise portal, step by step](https://engineergurukul.com/franchise/guide/using-the-franchise-portal/): How a member centre signs in, enrols students, hands over login slips, follows practice test results, requests certificates and reads notices in the franchise portal. - [The student journey from enquiry to certificate](https://engineergurukul.com/franchise/guide/student-journey/): Every step a student goes through at a member centre, from the first enquiry and demo class to admission, study, practice tests, the centre exam and the certificate. - [Teaching with the free resources on this site](https://engineergurukul.com/franchise/guide/teaching-with-free-resources/): How to use the free study books, practice tests, project guides, kids lessons, ebooks, learning paths and calculators on this site in your classes. - [Working with parents and schools](https://engineergurukul.com/franchise/guide/parents-and-schools/): How to talk to parents, keep them informed, handle complaints, and build a respectful relationship with nearby schools through talks, workshops and project days. - [Robotics and project classes for schools](https://engineergurukul.com/franchise/guide/robotics-and-project-classes/): How to plan and run hands-on robotics, electronics and science project sessions for school students, with safety, materials, a session plan and links to free guides. - [Safety, discipline and data privacy at a centre](https://engineergurukul.com/franchise/guide/safety-discipline-and-data-privacy/): Practical rules for a safe, orderly centre: fire and electrical safety, child safety, behaviour rules, online safety, student records and passwords. - [Growing from one centre to two](https://engineergurukul.com/franchise/guide/growing-from-one-centre-to-two/): When a second centre makes sense, how to know your first one is ready, what to document, how to choose a manager and how to avoid stretching yourself too thin. - [Common mistakes new centres make](https://engineergurukul.com/franchise/guide/common-mistakes/): The usual errors of first-time centre owners, from overspending on equipment and hiring weak teachers to poor records and promises that cannot be kept, and how to avoid them. - [A 90 day launch plan, week by week](https://engineergurukul.com/franchise/guide/ninety-day-launch-plan/): A week by week plan for your first three months: decide, prepare the premises and lab, hire, market, run demo classes, open your first batches and review what happened. ## Detailed project guides - [All guides](https://engineergurukul.com/resources/projects/) - [Balloon-powered car](https://engineergurukul.com/resources/projects/balloon-powered-car/): Build a car from cardboard, bottle caps and a balloon that is pushed along by escaping air, and measure how far and how fast it goes. A free first lesson in Newton’s third law. - [Pinhole camera (camera obscura)](https://engineergurukul.com/resources/projects/pinhole-camera/): Make a camera with no lens, only a tiny hole in foil, that shows the world outside upside down on a paper screen. A free way to prove that light travels in straight lines and to test the image-size rule yourself. - [Electromagnet crane](https://engineergurukul.com/resources/projects/electromagnet-crane/): Wind a coil of wire on an iron nail, power it with two cells, hang it from a cardboard crane and use it to lift steel paper clips. Then test how the number of turns changes the lifting power. - [Cardboard circuit board: series and parallel circuits](https://engineergurukul.com/resources/projects/cardboard-circuit-board/): Build a cardboard board with two torch bulbs, a paper-clip switch, an LED and a resistor, and compare series and parallel circuits yourself. See why one is dim, one is bright, and what happens when a bulb goes out. - [Lemon battery: electricity from fruit](https://engineergurukul.com/resources/projects/lemon-battery/): Push a zinc-coated nail and a copper strip into a lemon and measure the voltage. Join cells in series to try to make a low-current LED glow faintly or to run a small digital clock, then test which fruit gives the most vo - [Box solar cooker from a pizza box](https://engineergurukul.com/resources/projects/box-solar-cooker/): Turn a pizza box, foil, black paper and cling film into a solar oven, then measure how hot it gets and test the effect of the reflector, the cover and the colour of the floor. - [Weather station: rain gauge and wind vane](https://engineergurukul.com/resources/projects/rain-gauge-and-wind-vane/): Make a rain gauge from a plastic bottle and a wind vane from a straw and a pin, then record rain, wind direction and wind strength every day for two weeks and draw charts of your own weather. - [Self-watering planter from a plastic bottle](https://engineergurukul.com/resources/projects/self-watering-bottle-planter/): Turn a plastic bottle and a strip of old cotton cloth into a planter that waters itself by capillary action. Grow seedlings in it, and compare their growth with plants that are watered by hand. - [Plant maze: do plants grow towards light?](https://engineergurukul.com/resources/projects/plant-maze-phototropism/): Build a dark box with shelves that form a maze and a single hole for light, plant a seedling at the bottom, and watch it twist its way up to the light. A classic biology investigation of phototropism, with controls. - [Layered water filter from a plastic bottle](https://engineergurukul.com/resources/projects/layered-water-filter/): Build a filter from gravel, sand, charcoal and cotton in a cut bottle, clean a sample of muddy water, and measure how much clearer it becomes. Learn what filtration can and cannot do, and why the water is still not safe - [Make recycled paper from waste paper](https://engineergurukul.com/resources/projects/recycled-paper-making/): Turn old newspaper and used sheets into new paper with a home-made frame, a bowl of pulp and a sponge. Test its strength and thickness, and learn how paper is made and why recycling matters. - [Pythagoras theorem: a cardboard puzzle model](https://engineergurukul.com/resources/projects/pythagoras-theorem-puzzle/): Make a cardboard tray with four triangles and three squares that fit together in two different ways, and prove for yourself that the square on the hypotenuse equals the sum of the squares on the other two sides. - [Hydraulic robotic arm from syringes](https://engineergurukul.com/resources/projects/hydraulic-robotic-arm/): Build a cardboard robot arm that is lifted and gripped by water pushed through tubes from syringes on a control panel. A hands-on introduction to Pascal’s law, force, pressure and simple robotics, with no electricity at - [Bristlebot: a toothbrush robot that walks](https://engineergurukul.com/resources/projects/bristlebot-vibration-robot/): Make a tiny robot from an old toothbrush head, a small motor with an off-centre weight and one AAA cell. It vibrates and creeps across the table. Then race it, steer it and test what makes it faster. - [Mini wind turbine that lights an LED](https://engineergurukul.com/resources/projects/mini-wind-turbine/): Build a small wind turbine with blades cut from a plastic bottle and a toy motor used as a generator, light an LED, and measure how the voltage changes with the wind speed and with the number of blades. - [Build a science quiz game in Python](https://engineergurukul.com/resources/projects/python-science-quiz-game/): Write a complete quiz program with Python: a list of questions, a score, shuffling, a fact after each answer, a timer and a saved best score. No extra parts needed, only a computer and free software. ## Science project ideas (1028) - [Project idea finder](https://engineergurukul.com/resources/project-ideas/) ### Physics, Class 1 to 5 - [Balloon-powered car](https://engineergurukul.com/resources/project-ideas/balloon-car/): Air rushing backwards out of the balloon pushes the car forwards. This is Newton’s third law: every action has an equal and opposite reaction. - [Magnetic fishing game](https://engineergurukul.com/resources/project-ideas/magnet-fishing/): Magnets attract things made of iron and most kinds of steel, but not paper, plastic, wood, aluminium or copper. - [Paper cup telephone](https://engineergurukul.com/resources/project-ideas/cup-telephone/): Sound is a vibration. Your voice makes the cup vibrate, the tight string carries the vibration, and the other cup turns it back into sound. - [Simple electric circuit with a switch](https://engineergurukul.com/resources/project-ideas/simple-circuit/): Electricity flows only round a complete loop. The switch opens and closes the loop, turning the bulb off and on. - [Sink or float, and the clay boat](https://engineergurukul.com/resources/project-ideas/sink-or-float/): Whether something floats depends on its density and its shape. A ball of clay sinks, but the same clay shaped into a boat floats, because it pushes aside more water. - [Air pressure holds up water](https://engineergurukul.com/resources/project-ideas/air-pressure-card/): Air pushes on everything around us. When the glass is turned over, the air pressure pushing up on the card is enough to hold the water in. - [CD hovercraft](https://engineergurukul.com/resources/project-ideas/cd-hovercraft/): Air from the balloon forms a thin cushion under the CD. The cushion cuts friction with the table, so the hovercraft glides. - [Bottle-cap water wheel that lifts a weight](https://engineergurukul.com/resources/project-ideas/bottle-cap-water-wheel-lifts-a-weight/): Falling water pushes on the cups of the wheel and makes it turn. The turning axle winds up a thread and lifts a small weight, so the energy of moving water becomes useful work. - [Thread spool crane with a fixed pulley](https://engineergurukul.com/resources/project-ideas/thread-spool-fixed-pulley-crane/): A single fixed pulley does not make a load lighter, but it changes the direction of the pull, so you lift a load up by pulling down. That is why cranes, flagpoles and wells use pulleys. - [Ruler seesaw: balancing coins at different distances](https://engineergurukul.com/resources/project-ideas/ruler-seesaw-balancing-coins/): A lever balances when the weight times its distance from the pivot is equal on both sides. One coin far from the middle balances two coins placed half as far away. - [Shoebox shadow theatre: light travels in straight lines](https://engineergurukul.com/resources/project-ideas/shoebox-shadow-puppet-theatre/): A shadow forms because light travels in straight lines and cannot bend round an object. Moving the puppet nearer the torch makes its shadow larger and fuzzier; nearer the screen makes it smaller and sharper. - [How a stick’s shadow changes through the day](https://engineergurukul.com/resources/project-ideas/shadow-stick-length-through-the-day/): The shadow of a fixed stick is long in the morning, shortest around midday and long again in the evening, and it swings from west to east as the Sun moves across the sky. Shadow length depends on how high the Sun is. - [Tissue box rubber band guitar: what changes the pitch?](https://engineergurukul.com/resources/project-ideas/tissue-box-rubber-band-guitar-pitch/): Sound is made by vibration. A thin, tight or short rubber band vibrates faster and gives a higher note; a thick, loose or long one vibrates slower and gives a lower note. The hollow box makes the sound louder. - [Water bottle xylophone: pitch and the amount of water](https://engineergurukul.com/resources/project-ideas/glass-bottle-xylophone-water-levels/): Tapping a glass bottle makes the glass and the water vibrate, and more water makes the vibration slower and the note lower. Blowing across the top vibrates the air instead, so the bottle with the most water gives the hig - [Dancing rice drum: seeing sound vibrations](https://engineergurukul.com/resources/project-ideas/dancing-rice-drum-sound-vibration/): Sound travels through the air as vibrations. A loud sound near a stretched plastic sheet makes the sheet vibrate, and grains of rice on it jump, even though nothing touches the drum. - [Why does a clay ball sink but a clay boat float?](https://engineergurukul.com/resources/project-ideas/clay-boat-shape-and-floating/): The same lump of clay sinks as a ball but floats as a bowl, because the bowl shape pushes aside much more water. Floating depends on the shape and the water displaced, not only on the weight. - [How much salt makes an egg float?](https://engineergurukul.com/resources/project-ideas/egg-floats-in-salt-water-test/): An egg sinks in plain water but floats in salty water. Dissolving salt makes the water denser, so it pushes up harder on the egg. Measuring the salt needed turns a trick into a real experiment. - [Balloon in a bottle: air takes up space](https://engineergurukul.com/resources/project-ideas/balloon-in-a-bottle-air-takes-space/): A balloon hung inside a sealed bottle will not blow up, because the air already in the bottle has nowhere to go. Make a small hole in the bottle and the balloon inflates easily, proving that air is real and takes up spac - [Which shoe sole grips best? Friction on a tilting ramp](https://engineergurukul.com/resources/project-ideas/shoe-sole-friction-ramp-test/): Friction is the force that stops things sliding. A rough rubber sole needs the board to be tilted much more steeply before it slides than a smooth plastic sole, so the angle at which an object starts to slide is a simple - [What can a magnet pull through? Paper, cloth, wood and water](https://engineergurukul.com/resources/project-ideas/what-can-a-magnet-pull-through/): A magnet’s pull passes through paper, cloth, plastic, glass, wood and water, but gets weaker with distance. Only iron, steel and a few other metals are pulled by it, and a steel sheet in the way weakens the pull a great - [Floating needle compass that finds north](https://engineergurukul.com/resources/project-ideas/floating-needle-compass-in-a-bowl/): Stroking a steel needle with a magnet turns it into a weak magnet. Floated on water so it can turn freely, the needle lines up north to south, because the Earth itself acts like a giant magnet. - [Paper spiral snake that spins over warm air](https://engineergurukul.com/resources/project-ideas/paper-spiral-snake-rising-warm-air/): Warm air is lighter than cool air and rises. A paper spiral hung above a warm surface spins as the rising air pushes on its sloping coils, showing convection, the way heat spreads in air and water. - [Black tin versus white tin: which gets hotter in the sun?](https://engineergurukul.com/resources/project-ideas/black-and-white-tins-in-the-sun-heat-test/): A dark surface soaks up most of the sunlight that falls on it and gets hot, while a white or shiny surface reflects most of it and stays cooler. This is why we wear light colours in summer and why solar heaters are paint - [Bottle with three holes: water pressure grows with depth](https://engineergurukul.com/resources/project-ideas/bottle-with-three-holes-water-pressure-and-depth/): Water squirts furthest from the lowest hole in a bottle, because the weight of all the water above it presses on it. Pressure in a liquid increases with depth, which is why dam walls are thickest at the bottom. - [Ice cream stick catapult: how far does a pom-pom fly?](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-catapult-launch-test/): Pulling the arm down stores energy in the bent stick and rubber bands, and letting go turns it into the motion of the pom-pom. More bend means more stored energy and a longer flight, and the launch angle changes the dist - [Paper helicopter: wing length and fall time](https://engineergurukul.com/resources/project-ideas/paper-helicopter-wing-length-test/): A strip of paper with two folded wings spins as it falls, because air pushing on the slanted wings makes it turn. Longer wings catch more air and slow the fall, while adding paper clips makes it fall faster. Air resistan - [Plastic bag parachutes: does a bigger canopy fall slower?](https://engineergurukul.com/resources/project-ideas/plastic-bag-parachute-size-test/): A parachute slows a fall because its wide canopy pushes against a lot of air. Bigger canopies take longer to fall with the same load, and a small hole in the top makes the fall steadier instead of swinging. - [Balloon rocket on a string: action and reaction](https://engineergurukul.com/resources/project-ideas/balloon-rocket-on-a-string-line/): Air rushing out of the balloon’s neck pushes the balloon the other way along the string. The bigger the balloon, the further it travels. This is Newton’s third law, the same rule that lifts a real rocket. - [Cardboard bird that balances on a fingertip by its beak](https://engineergurukul.com/resources/project-ideas/balancing-cardboard-bird-on-a-fingertip/): A cardboard bird with coins hidden in its wing tips balances on its beak and even wobbles back upright when pushed. Adding weight far forward and low moves the bird’s centre of gravity to just below the beak, so it canno - [Cardboard castle drawbridge raised by thread and spools](https://engineergurukul.com/resources/project-ideas/cardboard-drawbridge-with-thread-and-spools/): A drawbridge is a lever hinged at one end, raised by threads that run over pulleys at the top of the gate and are wound on an axle. The model shows how a lever, pulleys and a wheel and axle work together to lift a load w - [Village well model: a wheel and axle that lifts a bucket](https://engineergurukul.com/resources/project-ideas/bottle-and-spool-wheel-and-axle-well/): Turning a large wheel moves a small axle with greater force, so a bucket of water can be lifted with a light push on the handle. The bigger the handle circle compared with the axle, the easier the lift but the more turns - [A screw is a wrapped ramp: paper triangle on a pencil](https://engineergurukul.com/resources/project-ideas/paper-triangle-on-a-pencil-screw-model/): Wrapping a paper triangle round a pencil turns its sloping edge into a spiral thread, just like a screw. A screw is an inclined plane wound round a rod, which is why it goes in with little force but needs many turns. - [Steel spoon mirrors: why one side flips your face](https://engineergurukul.com/resources/project-ideas/steel-spoon-curved-mirror-reflections/): The back of a shiny spoon is a convex mirror and always shows a small, upright, wide view. The bowl side is a concave mirror: it shows your face upside down from far away and large and upright when very close. - [Kaleidoscope from old CD case strips and a chips tube](https://engineergurukul.com/resources/project-ideas/kaleidoscope-from-cd-case-strips/): Three mirrors set in a triangle reflect light again and again, turning a few coloured beads into a symmetrical pattern of many images. It shows how reflection works and how multiple reflections multiply images. - [Making a rainbow with a mirror in a bowl of water](https://engineergurukul.com/resources/project-ideas/rainbow-from-a-mirror-in-a-bowl-of-water/): Sunlight looks white but is a mixture of colours. Water with a mirror in it acts like a prism, bending each colour by a slightly different amount, so the reflected beam fans out into red, orange, yellow, green, blue, ind - [The bending pencil: refraction in water, oil and glass](https://engineergurukul.com/resources/project-ideas/bent-pencil-in-a-glass-refraction-test/): A pencil standing in a glass of water looks broken at the surface because light bends when it passes from water into air. Different liquids bend light by different amounts, and a coin hidden under the rim of a cup reappe - [Water drop magnifier: a lens from a single drop](https://engineergurukul.com/resources/project-ideas/water-drop-magnifier-on-a-plastic-sheet/): A drop of water on clear plastic has a curved top, like a convex lens, and makes small print look bigger. A rounder, smaller drop magnifies more. It shows how lenses in magnifying glasses, spectacles and microscopes work - [Spinning colour disc: seven colours blend into white](https://engineergurukul.com/resources/project-ideas/spinning-colour-disc-seven-colours-to-white/): A disc painted with the seven rainbow colours looks almost white when spun fast, because the eye cannot keep up and mixes the colours together. White light is a mix of all colours, which is the reverse of a prism splitti - [Twanging ruler: how length changes pitch and loudness](https://engineergurukul.com/resources/project-ideas/twanging-ruler-length-and-pitch/): A ruler held over the edge of a table and twanged vibrates and makes a sound. A short overhang vibrates fast and gives a high note; a long overhang vibrates slowly and gives a low note. A harder twang makes a louder soun - [Cardboard ear trumpet that collects faint sounds](https://engineergurukul.com/resources/project-ideas/cardboard-cone-ear-trumpet-sound-collector/): A wide cone gathers sound waves from a large area and funnels them into the ear, so faint sounds become louder and clearer. Used the other way round, it sends your voice in one direction like a megaphone. - [Which spinning top lasts longest? Paper plate and bottle-cap tops](https://engineergurukul.com/resources/project-ideas/spinning-tops-which-shape-spins-longest/): A top stays upright while it spins fast, then wobbles and falls as friction slows it. Tops with a wide, heavy rim and a sharp point usually spin for longer. - [Rubbed balloon lifts paper bits and bends a thin stream of water](https://engineergurukul.com/resources/project-ideas/charged-balloon-paper-bits-and-water-stream/): Rubbing a balloon on hair gives it an electric charge. A charged object attracts light things like paper bits and even bends a stream of water. - [Which spoon gets hot first? Steel, wood and plastic with butter and beads](https://engineergurukul.com/resources/project-ideas/which-spoon-conducts-heat-best-butter-and-beads/): Heat travels along a solid by conduction. Metals pass heat quickly, while wood and plastic pass it slowly, so a bead stuck on a metal spoon with butter drops off first. - [Blow over a paper strip and watch it rise: fast air, low pressure](https://engineergurukul.com/resources/project-ideas/blowing-over-a-paper-strip-bernoulli-lift/): When you blow across the top of a paper strip it lifts instead of staying down. Fast-moving air has lower pressure than still air, so the stronger pressure below pushes the paper up. - [Coin drops into a glass when the card is flicked: inertia tricks](https://engineergurukul.com/resources/project-ideas/coin-drop-card-flick-inertia-tablecloth/): Objects keep their state of rest unless a force acts on them. When the card is flicked quickly, the coin does not move sideways and drops straight down into the glass. - [Which ball bounces highest? Drop height and floor surface test](https://engineergurukul.com/resources/project-ideas/which-ball-bounces-highest-drop-height-and-surface/): A ball stores energy when it is squashed and gives most of it back as it bounces. Different balls and surfaces return different fractions of the energy, so the bounce height changes. - [Pepper runs from soap: surface tension and a soap-powered boat](https://engineergurukul.com/resources/project-ideas/pepper-and-soap-surface-tension-boat/): The surface of water behaves like a thin stretched skin. Soap weakens this skin where it touches, so the stronger pull from the surrounding water drags the floating pepper outwards. - [Tin-can telephone: does a tight string carry sound better?](https://engineergurukul.com/resources/project-ideas/tin-can-telephone-string-tension-test/): Sound travels along a taut string as vibrations. A loose string cannot carry the vibration well, so the voice becomes faint. - [Drinking straw pan pipes: tube length and pitch](https://engineergurukul.com/resources/project-ideas/drinking-straw-pan-pipes-pitch/): A shorter air column vibrates faster and gives a higher pitch. Seven straws of different lengths make a simple scale. - [Paddle-wheel boat from a bottle and a rubber band](https://engineergurukul.com/resources/project-ideas/bottle-cap-paddle-wheel-rubber-band-boat/): The wheel pushes water backwards and the water pushes the boat forward, as in Newton’s third law. The twisted rubber band supplies the energy. - [Ice-cream stick tilt maze: guiding a marble by gravity](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-tilt-maze-rolling-marble/): A marble always rolls downhill. Tilting the board changes its direction and speed, so the player has to plan the slopes. - [Balloon-skin tin can drum where sound makes rice dance](https://engineergurukul.com/resources/project-ideas/tin-can-balloon-drum-dancing-rice/): Sound is a vibration. When a loud sound hits the stretched balloon, it vibrates and makes grains of rice jump, so we can see the vibration. - [The pepper that runs away from soap: surface tension](https://engineergurukul.com/resources/project-ideas/pepper-and-soap-surface-tension-run/): The surface of water acts like a thin stretched skin that holds light grains of pepper on top. A touch of soap breaks this skin in one place, and the pepper rushes away from it. - [How strong is paper? Folds, tubes and a stack of books](https://engineergurukul.com/resources/project-ideas/paper-folds-and-strength-book-load/): A flat sheet of paper is weak, but when it is folded into a tube, a fan or a triangle it can carry heavy books. You test different shapes of paper to see which holds the most. - [Wrap an ice cube: foil, wool, newspaper or cloth?](https://engineergurukul.com/resources/project-ideas/ice-cube-wraps-which-keeps-ice-longest/): Insulators slow the flow of heat into an ice cube, so it melts more slowly. By wrapping equal cubes in different household materials and weighing the meltwater, you find which ones insulate best. - [Glass bottle xylophone: water level and pitch](https://engineergurukul.com/resources/project-ideas/steel-glass-and-bottle-xylophone-pitch/): The pitch of a note from a tapped bottle depends on the amount of water in it: more water gives a lower note when tapped. You tune bottles into a scale and learn how vibration speed sets pitch. - [The spoon that rings like a bell: sound through string](https://engineergurukul.com/resources/project-ideas/spoon-on-string-church-bell-sound/): Vibrations pass much better through a solid string than through air. A steel spoon hung from a string and tapped on a table sounds faint, but when you press the string to your ear it rings like a deep bell. - [Straw rocket launcher: which fin shape flies the farthest?](https://engineergurukul.com/resources/project-ideas/straw-rocket-fin-shapes-flight/): A paper rocket is pushed off by a puff of air, and its fins keep it pointing straight. Changing only the fin shape while keeping everything else the same is a fair test of how fins help flight. - [Paper planes: dart, glider and wide-wing flight distance and time](https://engineergurukul.com/resources/project-ideas/paper-plane-dart-glider-wing-flight-test/): A paper plane flies by gliding: its wings make lift and the nose is pushed forward by the throw, while drag slows it. Different shapes trade speed for glide time. - [Sound guessing jars: shake and listen](https://engineergurukul.com/resources/project-ideas/sound-guessing-jars-shake-and-listen/): Different things make different sounds when shaken, because hard, soft, big and small things hit the inside of the jar differently. We can use hearing to work out what is hidden. - [Which fruits and vegetables float? Predict and test](https://engineergurukul.com/resources/project-ideas/fruit-and-vegetable-float-chart-predict-and-test/): Some fruits and vegetables float and some sink in water, depending on how much of the body is air and how heavy it is for its size. Predicting before testing is how scientists work. - [Foil boat: how many coins can it carry before it sinks?](https://engineergurukul.com/resources/project-ideas/foil-boat-how-many-coins-before-it-sinks/): The shape of a boat decides how much it can carry. A wide boat with high sides pushes aside more water and so carries more than a flat sheet. - [Magnet treasure hunt: what in my home is magnetic?](https://engineergurukul.com/resources/project-ideas/magnet-treasure-hunt-around-the-home/): A magnet attracts only some materials, mostly those with iron. Many things that look metallic, like a steel spoon or a coin, may not be magnetic. - [Magnet pole push: two toy cars that chase and run away](https://engineergurukul.com/resources/project-ideas/magnet-pole-push-race-cars/): Every magnet has two poles. Unlike poles pull together and like poles push apart, and we can use the push to move a small car without touching it. - [Paint mixing: a colour wheel from red, yellow and blue](https://engineergurukul.com/resources/project-ideas/paint-mixing-primary-colour-wheel/): Three paints, red, yellow and blue, can be mixed to make many other colours. Mixing shows how colours relate to each other. - [Torch and coloured cellophane: mixing lights on a wall](https://engineergurukul.com/resources/project-ideas/torch-and-cellophane-light-colour-mixing/): Coloured light mixes differently from paint. Where beams of red, green and blue light overlap, we see new colours, and all three together look almost white. - [Hand shadow animals: big and small shadows with a torch](https://engineergurukul.com/resources/project-ideas/hand-shadow-animals-and-distance-from-the-torch/): A shadow forms when something blocks light. The nearer the object is to the light, the bigger and softer the shadow is. - [Toy shadow length: does a higher torch make a shorter shadow?](https://engineergurukul.com/resources/project-ideas/toy-shadow-length-and-torch-height/): The length of a shadow depends on where the light is. A high light gives a short shadow and a low light gives a long one, like the Sun at noon and in the evening. - [Toy car ramp: does a steeper slope make the car go farther?](https://engineergurukul.com/resources/project-ideas/toy-car-ramp-height-and-distance-rolled/): A car rolling down a slope speeds up. A steeper ramp gives it more speed, so it rolls farther along the floor. - [Pencil rollers: how wheels help move a heavy box](https://engineergurukul.com/resources/project-ideas/pencil-rollers-move-a-heavy-box/): Rolling is easier than sliding. Rollers under a load reduce the friction, which is how the wheel was a great invention. - [Cardboard gears with paper teeth that turn each other](https://engineergurukul.com/resources/project-ideas/cardboard-gears-with-paper-teeth/): Two gears with teeth that mesh turn in opposite directions, and a small gear spins faster than a big one. - [Drinking straw whistle: shorter straw, higher sound](https://engineergurukul.com/resources/project-ideas/drinking-straw-whistle-pitch-changer/): Sound is made by vibrations. A shorter vibrating column of air gives a higher sound, and a longer one gives a lower sound. - [Comb and paper kazoo: feel your voice buzz](https://engineergurukul.com/resources/project-ideas/comb-and-paper-kazoo-buzzing-sound/): Vibrating paper makes a buzzing sound louder. We can feel the vibration on our lips. - [Does sound travel through water? The spoon and bowl test](https://engineergurukul.com/resources/project-ideas/sound-through-water-spoon-tap-test/): Sound can travel through liquids and solids as well as air. In water it travels even faster than in air. - [Feel your voice: humming throat and dancing salt on cling film](https://engineergurukul.com/resources/project-ideas/feel-your-voice-humming-and-sound-sprinkle/): Voice is a vibration. We can feel it in the throat and see the vibration make salt grains jump on a stretched sheet. - [Ice cube melting: sun, shade, cloth and steel plate](https://engineergurukul.com/resources/project-ideas/ice-cube-melting-in-sun-shade-and-cloth/): Heat melts ice. The speed of melting depends on how warm the place is and whether the ice is covered or not. - [Does water take up more room when it freezes?](https://engineergurukul.com/resources/project-ideas/does-freezing-water-need-more-room-bottle-test/): Water expands a little when it freezes. Ice takes up more space than the same water, which is why ice floats. - [Simple diamond paper kite and a flying test](https://engineergurukul.com/resources/project-ideas/simple-diamond-paper-kite-flying-test/): A kite flies because wind pushes on it at a slant and string holds it. The tail keeps it steady. - [Paper plane race: which fold flies the farthest?](https://engineergurukul.com/resources/project-ideas/paper-plane-folds-distance-race/): Wing shape and fold change how far a plane flies. A fair test means launching each plane the same way and measuring the distance. - [Paper clip on the nose: does weight help a plane glide?](https://engineergurukul.com/resources/project-ideas/paper-clip-weighted-plane-nose-weight-test/): The position of weight changes how a plane flies. A little weight in the front makes it steady, but too much makes it dive. - [Paper pinwheel that spins in the breeze](https://engineergurukul.com/resources/project-ideas/paper-pinwheel-that-spins-in-the-breeze/): Moving air can push on slanted blades and make them turn. Wind energy is used the same way in windmills. - [Static comb: lifting paper bits and bending a water stream](https://engineergurukul.com/resources/project-ideas/static-comb-and-paper-bits-dance/): Rubbing some things together gives them an electric charge, called static electricity. A charged comb can pull tiny paper bits and bend a thin water stream. - [Rain stick from a cardboard tube: the sound of falling rain](https://engineergurukul.com/resources/project-ideas/rain-stick-from-a-cardboard-tube/): Many grains falling past obstacles make a sound like rain. We hear the vibrations of grains hitting the tube walls and the pins. ### Chemistry, Class 1 to 5 - [Rainbow in a glass (density tower)](https://engineergurukul.com/resources/project-ideas/density-rainbow/): Water with more sugar dissolved in it is denser, so it sinks below water with less sugar. Layers of differently sweetened, coloured water stack up like a rainbow. - [Erupting volcano model](https://engineergurukul.com/resources/project-ideas/erupting-volcano/): Vinegar (an acid) reacts with baking soda (a base) and gives off carbon dioxide gas, which pushes the foam out. Real volcanoes erupt molten rock, so the model shows the shape of a volcano, not its cause. - [Turmeric paper strips that spot soaps and acids](https://engineergurukul.com/resources/project-ideas/turmeric-paper-strips-acid-base-tester/): Turmeric contains a yellow dye called curcumin that turns reddish brown in a base such as soap water and stays yellow in an acid such as lemon juice. Home-made turmeric strips work like litmus paper and let you sort kitc - [Growing sugar crystals on a string, like mishri](https://engineergurukul.com/resources/project-ideas/sugar-crystals-on-a-string-mishri/): Hot water dissolves far more sugar than cold water. As a very strong sugar solution cools and slowly loses water, the extra sugar comes out of solution as crystals that grow on a string, which is exactly how mishri is ma - [Crystal shapes of salt, sugar and alum under a magnifier](https://engineergurukul.com/resources/project-ideas/crystal-shapes-salt-sugar-under-a-magnifier/): Each substance makes crystals of its own fixed shape: salt forms cubes, sugar forms slanted blocks, and alum forms pointed double pyramids. Looking at grains with a magnifier shows that crystals are not random lumps but - [Stirring or warm water: which dissolves sugar faster?](https://engineergurukul.com/resources/project-ideas/stirring-or-warm-water-dissolves-sugar-faster/): Dissolving gets faster when the water is warmer, when the liquid is stirred, and when the sugar is in smaller pieces. A fair test with a stopwatch shows which of these three has the biggest effect. - [Making salt from salty water in a sunny tray](https://engineergurukul.com/resources/project-ideas/salt-from-brine-by-sun-evaporation-tray/): When salt water is left in the sun, only the water escapes as vapour and the salt stays behind as white crystals. This is how salt pans on the coast of Gujarat and Tamil Nadu produce the salt we eat. - [Measuring the gas from baking soda and vinegar with a balloon](https://engineergurukul.com/resources/project-ideas/baking-soda-vinegar-balloon-gas-measure/): Baking soda and vinegar react to make carbon dioxide gas, which inflates a balloon fitted over the bottle. Using more baking soda makes a bigger balloon, until the vinegar is used up and extra baking soda does nothing. - [Baking soda invisible ink revealed without any heat](https://engineergurukul.com/resources/project-ideas/baking-soda-invisible-ink-no-heat-reveal/): A message written in baking soda water dries invisible, but a wash of turmeric water or purple grape juice turns the writing a different colour because baking soda is a base and these juices are indicators. No heat or fl - [Chromatography of the colours in candy coatings](https://engineergurukul.com/resources/project-ideas/candy-coating-colour-chromatography/): The coloured coating on candies such as Gems is often a mixture of several food dyes. Water climbing up filter paper carries the dyes at different speeds, so a single dot of colour spreads into separate bands and shows w - [Ice melting race: salt, sugar, sand or nothing?](https://engineergurukul.com/resources/project-ideas/ice-melting-race-salt-sugar-sand/): Sprinkling salt on ice makes it melt faster than plain ice, sugar helps a little, and sand hardly at all. Dissolved substances lower the temperature at which water freezes, so salted ice keeps melting even in air that is - [Three states of water in a bag taped to a sunny window](https://engineergurukul.com/resources/project-ideas/three-states-of-water-in-a-window-bag/): A zip bag with a little water and an ice cube, taped to a sunny window, shows all three states of water: the ice melts, the water evaporates, and the vapour condenses into drops on the cool upper part of the bag that run - [Lava bottle with oil, water and a fizzing tablet](https://engineergurukul.com/resources/project-ideas/oil-water-fizzing-tablet-lava-bottle/): Oil floats on water because it is less dense, and the two do not mix. A piece of fizzing antacid tablet (ENO or similar) dropped in makes carbon dioxide bubbles that lift blobs of coloured water up through the oil and le - [Floating egg: how many spoons of salt does it take?](https://engineergurukul.com/resources/project-ideas/floating-egg-how-much-salt-does-it-take/): A fresh egg sinks in plain water but floats once enough salt is dissolved, because dissolving salt makes the water denser than the egg. Counting the spoons needed turns a trick into a measurement of density. - [Naked bouncy egg: vinegar dissolves the shell](https://engineergurukul.com/resources/project-ideas/naked-bouncy-egg-vinegar-dissolves-shell/): An eggshell is calcium carbonate, which reacts with the acid in vinegar and fizzes away as carbon dioxide, leaving the egg held only by its soft membrane. The rubbery egg also swells, showing that water passes into it th - [Frost on a tin can using only ice and salt](https://engineergurukul.com/resources/project-ideas/frost-on-a-tin-with-ice-and-salt/): Crushed ice mixed with salt gets colder than ice alone, below the freezing point of water. The outside of a tin filled with the mix becomes so cold that water vapour from the air freezes on it as a white frost, which nev - [Does dissolved sugar still weigh the same?](https://engineergurukul.com/resources/project-ideas/does-dissolved-sugar-still-weigh-the-same/): When sugar disappears into water, its mass does not disappear: the sugar water weighs exactly as much as the sugar and the water did separately. Weighing before and after shows that dissolving spreads the sugar out but d - [Why apple slices turn brown and what stops it](https://engineergurukul.com/resources/project-ideas/apple-browning-lemon-juice-test/): A cut apple turns brown when enzymes in it react with oxygen in the air. Lemon juice, salt water, sugar water and cold slow or stop the change, which shows how cooks keep fruit looking fresh. - [Candy colour race: hidden dyes in coated sweets](https://engineergurukul.com/resources/project-ideas/candy-colour-race-coffee-filter/): Coloured sweets often use a mix of dyes, and water carrying them up paper moves different dyes at different speeds. You split the colours of several sweets and learn how to separate a mixture without any chemicals. - [Which fabric soaks up the most water: cotton, nylon, wool or polyester?](https://engineergurukul.com/resources/project-ideas/fabric-absorbency-towel-cotton-nylon/): Cotton and wool fibres absorb a lot of water, while nylon and polyester absorb little. By weighing identical fabric squares before and after soaking, you find which fabric is best for towels and which for raincoats. - [Walking rainbow: colours that climb a paper towel](https://engineergurukul.com/resources/project-ideas/walking-rainbow-paper-towel-colours/): Water climbs up paper and carries colours with it. When red and yellow meet in the middle they make orange, and blue and yellow make green. - [Water drops on a coin: how many drops fit?](https://engineergurukul.com/resources/project-ideas/water-drops-on-a-coin-and-wax-paper/): Water drops hold together like a skin and make a dome. A coin can hold many drops before the water spills over. - [What dissolves in water? A kitchen tray test](https://engineergurukul.com/resources/project-ideas/what-dissolves-in-water-kitchen-tray-test/): Some things disappear in water, such as salt and sugar, and some do not, such as sand and flour. We call the first group soluble. - [Soap bubble wands: do square wands make square bubbles?](https://engineergurukul.com/resources/project-ideas/soap-bubble-wands-in-different-shapes/): Bubbles are always round, whatever the shape of the wand. Soap film pulls itself into the shape with the least surface, which is a sphere. ### Biology, Class 1 to 5 - [What do seeds need to sprout?](https://engineergurukul.com/resources/project-ideas/seed-germination/): Seeds need water, air and warmth to germinate. Most seeds sprout even in the dark, but the seedlings need light to turn green and keep growing. - [Parts of a plant model](https://engineergurukul.com/resources/project-ideas/parts-of-a-plant/): Roots take in water and hold the plant firm, the stem carries water up, leaves make food using sunlight, and flowers make seeds. - [Bean seed against a glass jar: a root and shoot diary](https://engineergurukul.com/resources/project-ideas/bean-seed-glass-jar-root-shoot-diary/): A seed pressed between wet paper and the glass wall of a jar lets you watch the root come out first and grow down, then the shoot grow up and open its first leaves. Drawing it every day records how a seedling develops. - [Turn a sprouting seed sideways: do roots still grow down?](https://engineergurukul.com/resources/project-ideas/roots-grow-down-turned-seedling-test/): When a sprouting seed is turned on its side, the root bends to keep growing downwards and the shoot bends upwards. Plants sense gravity, and the response is called gravitropism (or geotropism). - [Plastic bag over a leafy twig: collect the water leaves give off](https://engineergurukul.com/resources/project-ideas/bag-over-leafy-twig-transpiration-water/): A clear bag tied over a leafy branch fills with droplets within a few hours, while a bag over a bare branch stays dry. Leaves lose water vapour through tiny pores (stomata), a process called transpiration. - [Leaf rubbing album: parallel and net vein patterns](https://engineergurukul.com/resources/project-ideas/leaf-rubbing-vein-pattern-album/): Rubbing a crayon over paper laid on a leaf prints its vein pattern. Grass, banana and wheat leaves show parallel veins; peepal, mango and hibiscus leaves show a branching net, and the pattern tells you which group the pl - [Human skeleton from cardboard tubes, straws and bottle caps](https://engineergurukul.com/resources/project-ideas/cardboard-tube-skeleton-from-waste/): A life-size or half-size skeleton built from waste shows the main bones of the body, how the skull protects the brain, how the ribs make a cage around the heart and lungs, and where the joints let us bend. - [Five senses stations: mystery box, smell jars and sound tins](https://engineergurukul.com/resources/project-ideas/five-senses-stations-mystery-box/): Five simple stations test touch, smell, hearing, sight and taste one at a time. Each sense organ collects a different kind of information and sends it to the brain, which works out what the object is. - [Eggshells in cola, juice, milk and water: a tooth decay model](https://engineergurukul.com/resources/project-ideas/eggshell-in-cola-juice-tooth-decay-model/): Eggshells soaked in cola and fruit juice soften, stain and lose material within days, while shells in milk and water stay hard. Eggshell, like tooth enamel, is a hard mineral that acids slowly dissolve, so sugary and aci - [Glitter germs: which handwashing method removes the most?](https://engineergurukul.com/resources/project-ideas/glitter-germs-handwashing-test/): Glitter or turmeric mixed with a little oil stands in for germs on the hands. Rinsing with water alone leaves most of it, while 20 seconds of soap and rubbing removes nearly all, showing why proper handwashing matters. - [Balcony bird diary: a 2 week tally of the birds around you](https://engineergurukul.com/resources/project-ideas/balcony-bird-diary-tally-chart/): Watching the same spot for 15 minutes each morning and evening and tallying every bird seen shows which species live nearby, when each is active and what it eats. The diary becomes a small record of local biodiversity. - [Ant trails: which foods do ants choose and how do they find them?](https://engineergurukul.com/resources/project-ideas/ant-trail-food-choice-observation/): Tiny drops of sugar water, salt water, oil and plain water set out near an ant trail show which foods ants prefer and how a few scouts quickly bring many workers along a chemical trail. Wiping a damp tissue across the tr - [Celery stalk in coloured water: how water climbs a stem](https://engineergurukul.com/resources/project-ideas/celery-stalk-coloured-water-climb/): Plants pull water up through thin tubes in their stems. When the water is coloured, the colour travels up inside the stalk and shows exactly where the tubes run, all the way to the leaves. - [White flower with a split stem that drinks two colours](https://engineergurukul.com/resources/project-ideas/white-flower-split-stem-two-colours/): A single white flower can turn two colours when its stem is split and each half drinks a different dye. It shows that water travels in separate channels all the way up to the petals. - [Funnel and tube stethoscope to hear the heartbeat](https://engineergurukul.com/resources/project-ideas/funnel-and-tube-stethoscope-hear-your-heartbeat/): A funnel and a rubber tube can carry the sounds of the heart to your ear. You hear a steady lub-dub that is made as the heart valves close. - [Four body joints from waste: ball, hinge, pivot and gliding](https://engineergurukul.com/resources/project-ideas/four-body-joints-from-waste-ball-hinge-pivot-gliding/): Where two bones meet, a joint lets them move in a particular way. Models made from waste show how a ball and socket, a hinge, a pivot and a gliding joint each allow a different movement. - [Clay mouth model with the four tooth types and their jobs](https://engineergurukul.com/resources/project-ideas/clay-mouth-model-four-tooth-types-and-what-they-do/): Our teeth have different shapes for different jobs. Incisors cut, canines tear, premolars and molars crush and grind, and each kind can be matched to the food it deals with. - [Tea-stained eggshell: water, brush or toothpaste, which cleans best?](https://engineergurukul.com/resources/project-ideas/tea-stained-eggshell-brushing-with-and-without-toothpaste/): Foods and drinks can stain the surface of teeth, and brushing removes the stain. Stained eggshells stand in for teeth to compare rinsing, brushing with water and brushing with toothpaste. - [Balanced thali plate model: what each food group does for the body](https://engineergurukul.com/resources/project-ideas/balanced-thali-plate-model-food-groups/): A good meal has foods that give energy, foods that build the body and foods that protect it. A paper or clay thali shows roti and rice, dal, vegetables, curd and fruit in sensible amounts. - [Bamboo, pine cone and brick insect hotel for garden helpers](https://engineergurukul.com/resources/project-ideas/bamboo-and-brick-insect-hotel-for-solitary-bees/): Many helpful insects, such as solitary bees, need small holes to nest or shelter. A hotel made from waste gives them a safe place and lets you observe from a distance who moves in. - [Seed travel models: wind wing, fluff parachute, floating husk, hook and spring](https://engineergurukul.com/resources/project-ideas/seed-travel-models-wind-water-hook-and-spring/): Plants spread their seeds far from the parent so the young plants have room to grow. Paper and cloth models copy how wind, water, animals and bursting pods carry seeds. - [Paper plate food chain and food web spinner](https://engineergurukul.com/resources/project-ideas/paper-plate-food-chain-spinner/): Energy passes from the Sun to plants and then to animals that eat them. The spinner shows who eats whom and why the chain starts with a producer. - [Cardboard flower with removable parts that shows pollination](https://engineergurukul.com/resources/project-ideas/cardboard-flower-model-removable-parts-pollination/): A flower has sepals, petals, stamens and a pistil. Pollen travels from the stamen to the stigma, which starts the making of seeds. - [Egg tray seed nursery: which seeds sprout first?](https://engineergurukul.com/resources/project-ideas/egg-tray-seed-nursery-germination-race/): Seeds need water, air and warmth to sprout. The nursery lets children compare how fast different seeds germinate and then plant them out. - [Which bag ripens bananas faster? Ethylene gas at home](https://engineergurukul.com/resources/project-ideas/banana-ripening-paper-bag-ethylene/): Ripe fruits release a gas called ethylene that makes other fruits ripen faster. By keeping green bananas in different bags and with a ripe fruit, you see how trapping this gas speeds up ripening. - [Paper-cup stethoscope for listening to a heartbeat and counting it](https://engineergurukul.com/resources/project-ideas/paper-cup-stethoscope-heartbeat-listening/): Sound from the heart is passed through the chest and can be gathered by a cup, which makes it louder in your ear. Counting the beats gives the heart rate. - [Sprouting moong and chana: a five-day length and weight log](https://engineergurukul.com/resources/project-ideas/sprouts-moong-chana-growth-weight-log/): Soaked seeds wake up, absorb water and start to grow roots and shoots. Measuring weight and sprout length every day shows how quickly the seed changes, and why sprouts are a popular food. - [Nature walk collection tray with labels](https://engineergurukul.com/resources/project-ideas/nature-walk-collection-tray-with-labels/): Plants and their parts come in many sizes, shapes and colours. Collecting and sorting fallen things makes us look closely and notice differences. - [Leaf colour matching chart: how many greens?](https://engineergurukul.com/resources/project-ideas/leaf-colour-matching-paint-chart/): Leaves are not all the same green. Their colours show the plant type and age, and children learn to compare and name shades. - [Mustard seeds on wet cotton wool: a growing diary](https://engineergurukul.com/resources/project-ideas/mustard-seeds-growing-on-wet-cotton-wool/): Seeds need water, air and warmth to sprout. Mustard seeds grow quickly, so we can see roots and shoots within days. - [Sprouting moong in a wet cloth: day by day](https://engineergurukul.com/resources/project-ideas/sprouting-moong-dal-in-a-wet-cloth/): Dry seeds are alive. With water they wake up and sprout, and the sprouts are a healthy food full of nutrients. - [Onion roots growing in a jar of water](https://engineergurukul.com/resources/project-ideas/onion-roots-growing-in-a-glass-jar/): An onion bulb can grow roots when it touches water. We can watch the roots grow day by day and measure them. - [Grass head: a sock friend with growing hair](https://engineergurukul.com/resources/project-ideas/grass-head-sock-with-sawdust-and-seeds/): Seeds grow when kept in damp soil and light. The sock holds the soil and the grass grows out of it like hair. - [Seed collection box: 12 seeds from the kitchen and garden](https://engineergurukul.com/resources/project-ideas/seed-collection-and-sorting-egg-box/): Seeds differ in shape, size, colour and surface. Each shape helps the plant spread its seeds by wind, water or animals. - [Does a plant lean towards the window light?](https://engineergurukul.com/resources/project-ideas/plant-leans-towards-the-window-light-test/): Plants grow towards light. A seedling kept by a window bends towards it, and turns back if we turn the pot around. - [Heartbeat count: resting and after 20 jumps](https://engineergurukul.com/resources/project-ideas/heartbeat-count-before-and-after-jumping/): The heart beats faster when the body works harder. We can feel the pulse and count it to see the change. - [How big is my breath? Blowing up a balloon](https://engineergurukul.com/resources/project-ideas/balloon-breath-how-big-is-my-breath/): Our lungs hold air. We can compare how much air different people can blow out in one breath by measuring a balloon. - [Fingerprint cards: loops, whorls and arches](https://engineergurukul.com/resources/project-ideas/fingerprint-cards-loops-whorls-and-arches/): Every person has a different pattern of ridges on their fingertips. The patterns fall into a few main types: loops, whorls and arches. - [Egg carton teeth model: incisors, canines and molars](https://engineergurukul.com/resources/project-ideas/egg-carton-teeth-model-and-brushing/): We have different teeth for different jobs: cutting, tearing and grinding. A model helps us remember them and brush each properly. - [Regrowing carrot and beetroot tops in a shallow dish](https://engineergurukul.com/resources/project-ideas/regrowing-carrot-and-beetroot-tops-in-a-dish/): Plants store food in roots like carrot and beetroot. If the top is kept in water, it uses that stored food to sprout new leaves. ### Maths, Class 1 to 5 - [Fraction wall](https://engineergurukul.com/resources/project-ideas/fraction-wall/): Strips cut into halves, thirds, quarters and smaller parts show which fractions are equal (2/4 is the same as 1/2) and which fraction is bigger. - [Bottle-cap abacus that shows ones, tens, hundreds and thousands](https://engineergurukul.com/resources/project-ideas/bottle-cap-place-value-abacus/): Each rod of the abacus stands for a place: ones, tens, hundreds and thousands. Ten caps on one rod are worth exactly one cap on the next rod to the left, so the number 2,346 is 2 caps, 3 caps, 4 caps and 6 caps from left - [Base-ten blocks from matchsticks, matchboxes and a carton](https://engineergurukul.com/resources/project-ideas/matchbox-base-ten-blocks/): A single matchstick is one, a bundle of ten is a ten, a flat of ten bundles is a hundred and a box of ten flats is a thousand. Seeing the sizes side by side shows why 1,000 is so much more than 100. - [Hundred chart with coloured windows for skip counting patterns](https://engineergurukul.com/resources/project-ideas/hundred-chart-pattern-windows/): On a 10 by 10 chart of 1 to 100, counting in twos, fives and tens makes straight columns, counting in nines makes a diagonal and counting in threes makes slanting stripes. Patterns appear because the chart has ten number - [Clothes-peg number line with a jumping frog for adding](https://engineergurukul.com/resources/project-ideas/clothes-peg-number-line-jumper/): Adding is jumping forwards along the number line and subtracting is jumping backwards. The frog shows that 7 + 5 and 5 + 7 land on the same number, and that 12 take away 5 brings you back to 7. - [Fraction pizza circles with a spinner that matches equal parts](https://engineergurukul.com/resources/project-ideas/fraction-pizza-spinner-board/): Circles cut into 2, 3, 4, 6, 8 and 12 equal slices show that 1/2 is the same amount as 2/4, 3/6, 4/8 and 6/12, and that two slices of 1/3 plus one of 1/6 make 5/6, which is less than one whole pizza. - [Sliding decimal point board for tenths and hundredths](https://engineergurukul.com/resources/project-ideas/sliding-decimal-point-board/): The digits of a number stay in order while the decimal point slides. Moving the point one place to the right multiplies by 10 (3.45 becomes 34.5) and one place to the left divides by 10 (3.45 becomes 0.345). - [Times-table string art on a ten-point circle](https://engineergurukul.com/resources/project-ideas/times-table-string-art-circle/): Join the last digits of a multiplication table in order on a circle marked 0 to 9: the two times table draws a pentagon, the three times table a ten-pointed star, the five times table a single line, and the nine times ta - [Paper plate angle maker with a sliding arm and degree scale](https://engineergurukul.com/resources/project-ideas/paper-plate-angle-maker/): Two plates joined at the centre open like a fan to show any angle from 0 to 360 degrees. The scale shows that a right angle is 90 degrees, a straight angle 180 degrees and a full turn 360 degrees, and the arm names each - [Nail and rubber-band geoboard for shapes, perimeter and area](https://engineergurukul.com/resources/project-ideas/nail-geoboard-shapes-and-area/): Rubber bands stretched round nails on a square grid make triangles, rectangles and other polygons in seconds. Counting the unit squares inside a shape gives its area, and a rectangle 3 by 4 always has area 12 and perimet - [Tangram set with a fraction and area table for each piece](https://engineergurukul.com/resources/project-ideas/tangram-fraction-area-set/): The seven tangram pieces are cut from one square. The two large triangles are each one quarter of the square, the medium triangle, the square and the parallelogram are each one eighth, and the two small triangles are eac - [Hinged mirror pair that shows symmetry and how many images appear](https://engineergurukul.com/resources/project-ideas/hinged-mirror-symmetry-box/): A single mirror stood on a shape shows its line of symmetry: half a butterfly becomes a whole one. Two mirrors hinged together show more and more copies as the angle closes: at 90 degrees you see 4 copies in all, at 60 d - [Bottle-cap pie chart built from a class survey of favourite games](https://engineergurukul.com/resources/project-ideas/bottle-cap-pie-chart-class-survey/): A survey of 30 classmates is shown as coloured bottle caps on a circle. If 12 chose cricket, cricket gets 12 out of 30 of the circle, which is 144 degrees, and the slices of the pie add up to the full 360 degrees of the - [Multiplication snakes and ladders board from a cereal box](https://engineergurukul.com/resources/project-ideas/multiplication-snakes-and-ladders-board/): Landing on a square means answering a multiplication fact. Repeated practice helps children learn tables and see the patterns in them. - [Cardboard teaching clock with movable hour and minute hands](https://engineergurukul.com/resources/project-ideas/cardboard-teaching-clock-movable-hands/): The minute hand goes round 12 times for every one round of the hour hand. Learners can set times and see how hours, minutes and angles connect. - [Ice-cream stick fraction wall for halves, quarters and eighths](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-fraction-wall/): Equal parts of the same whole can be compared by length. The wall shows that one half equals two quarters and four eighths. - [How much does rice swell? Water ratio and volume maths](https://engineergurukul.com/resources/project-ideas/rice-and-water-ratio-swelling/): Rice soaks up water and swells, and the amount of cooked rice depends on the ratio of rice to water. By measuring in cups you practise ratio and volume and see how much bigger the rice becomes. - [Scaling a recipe: ratios, fractions and measuring cups](https://engineergurukul.com/resources/project-ideas/scaling-a-recipe-ratio-and-measuring-cups/): A recipe is a set of ratios, so halving or doubling it means multiplying every amount by the same number. You rewrite a simple recipe for 2, 8 and 12 people and practise fractions and unit conversion. - [Button sorting game: colour, size and number of holes](https://engineergurukul.com/resources/project-ideas/button-sorting-sets-by-colour-shape-size/): The same set of things can be sorted in many ways, and each rule makes different groups. Sorting is the first step of handling data and of seeing patterns. - [Feely bag: guess the shape by touch alone](https://engineergurukul.com/resources/project-ideas/feely-bag-shape-guessing-game/): We can know shapes by their edges and corners, not only by looking. Feeling flat and solid shapes trains children to count sides, corners and curves. - [Measuring with my hand span and my foot](https://engineergurukul.com/resources/project-ideas/hand-span-and-foot-measuring-with-my-body/): Measuring means comparing with a unit. Hand spans and feet are handy units, but they differ from person to person, which is why we need a standard unit like the centimetre. - [Shape detective: find circles, squares and triangles at home](https://engineergurukul.com/resources/project-ideas/shape-detective-collage-from-around-the-house/): Shapes are everywhere around us. Looking for them helps children name shapes and count their sides and corners. - [Bead string patterns: AB, AAB and ABC necklaces](https://engineergurukul.com/resources/project-ideas/bead-string-patterns-ab-aab-abc/): A pattern is something that repeats in a set order. Making and continuing patterns builds the skill of predicting what comes next. - [Dot rangoli: patterns with lines and symmetry on dots](https://engineergurukul.com/resources/project-ideas/dot-rangoli-patterns-on-squared-paper/): Joining dots makes patterns that have symmetry. Both halves of the drawing look the same, like a rangoli. - [Paper tiles that fit together: which shapes leave no gaps?](https://engineergurukul.com/resources/project-ideas/paper-tiles-that-fit-together-without-gaps/): Some shapes, like squares, triangles and hexagons, can cover a floor without gaps. Others, like circles, leave gaps. This is why floors are tiled with certain shapes. - [Cardboard clock with hands that move: hours and half hours](https://engineergurukul.com/resources/project-ideas/cardboard-clock-with-moving-hands/): A clock face has twelve numbers, and the short hand shows hours while the long hand shows minutes. Moving the hands helps us read time. - [My day on a clock chart: wake, school, play and sleep](https://engineergurukul.com/resources/project-ideas/my-day-clock-routine-chart/): Time passes in hours, and we can show our day as parts on a clock. This helps us plan our time and see how long each task takes. - [Number hopscotch: hop to add and subtract](https://engineergurukul.com/resources/project-ideas/floor-hopscotch-adding-and-subtracting-game/): Adding is moving forward on a number line and subtracting is moving back. Hopping makes the idea physical and fun. - [Paper money class shop: buy, sell and give change](https://engineergurukul.com/resources/project-ideas/paper-money-class-shop-role-play/): Money is used to buy things, and shopkeepers give back change. Playing shop teaches adding prices, counting notes and finding change. - [Rupee coins and notes matching cards](https://engineergurukul.com/resources/project-ideas/rupee-coin-and-note-matching-cards/): Money has different values, and we can make the same amount in many ways. Matching games help children count in ones, twos, fives and tens. - [Weekly pocket money chart: save, spend and share](https://engineergurukul.com/resources/project-ideas/weekly-pocket-money-tally-chart/): Money can be saved, spent or shared. Writing it in a chart shows where it goes and helps children plan. ### Earth and space, Class 1 to 5 - [Solar system model](https://engineergurukul.com/resources/project-ideas/solar-system-model/): The eight planets in order from the Sun, and how much bigger the giant planets are than Earth. Real distances are far too large to show to scale, so say so on your label. - [Water cycle in a bowl](https://engineergurukul.com/resources/project-ideas/water-cycle/): Warm water evaporates, the vapour condenses into drops on the cold cover, and the drops fall back like rain: the water cycle in miniature. - [Phases of the moon model](https://engineergurukul.com/resources/project-ideas/moon-phases/): Half of the Moon is always lit by the Sun. As the Moon travels round the Earth we see different amounts of that lit half, which gives the phases. They are not caused by the Earth’s shadow. - [Rain gauge](https://engineergurukul.com/resources/project-ideas/rain-gauge/): Rainfall is measured as the depth of water that would collect on flat ground, in millimetres. A straight-sided container gives a fair reading. - [Layers of the Earth model](https://engineergurukul.com/resources/project-ideas/layers-of-the-earth/): The Earth has a thin rocky crust, a thick hot mantle, a liquid outer core and a solid inner core. - [Balloon-and-bottle barometer with a two-week weather log](https://engineergurukul.com/resources/project-ideas/bottle-barometer-weather-log/): Air pressure changes from day to day. When the outside pressure rises it presses the balloon skin inwards and the straw pointer tips up; when pressure falls before rain, the pointer tips down. - [Bottle wind vane on a compass rose that logs wind direction](https://engineergurukul.com/resources/project-ideas/wind-vane-with-compass-rose/): A wind vane turns until its large tail is pushed downwind, so the small arrow head points into the wind. Winds are named by the direction they come from, and the direction often changes before the weather does. - [Water cycle in a zip bag taped to a sunny window](https://engineergurukul.com/resources/project-ideas/water-cycle-in-a-zip-bag/): Sunlight warms the water, some of it evaporates into vapour, the vapour cools on the plastic and condenses into droplets, and the droplets run down as "rain". The same four stages drive the real water cycle. - [Cut-away model of a composite volcano with magma chamber and vents](https://engineergurukul.com/resources/project-ideas/composite-volcano-cross-section-model/): A composite volcano is built from alternating layers of hardened lava and ash. Magma rises from a chamber deep below through a central pipe and sometimes side vents, and the cut-away shows how the inside connects to the - [Spinning globe and torch that shows day, night and sunrise times](https://engineergurukul.com/resources/project-ideas/day-and-night-globe-with-torch/): The Earth spins on its axis once a day, so one half faces the Sun and has day while the other half has night. Places further east on the globe turn into the light first, which is why the sun rises earlier in Kolkata than - [Paper-cup constellation projector for seven Indian sky patterns](https://engineergurukul.com/resources/project-ideas/constellation-projector-cups/): Stars seem to form patterns called constellations. Cups with pinholes in the right pattern throw those patterns onto a dark wall, so a child learns to recognise Orion, the Great Bear, Cassiopeia and others before finding - [Planet sizes compared with fruit and seeds from the kitchen](https://engineergurukul.com/resources/project-ideas/planet-sizes-from-fruit-and-seeds/): The eight planets differ hugely in size. With the Earth as a peppercorn, Jupiter is a small orange and the Sun would be a ball about 44 centimetres across, so everyday objects show the true sizes far better than equal-si - [Shadow stick that finds true north and the real local noon](https://engineergurukul.com/resources/project-ideas/shadow-stick-finds-noon-and-north/): A vertical stick's shadow is longest at sunrise, shrinks until the Sun is highest, then grows again. The shortest shadow lies along the north-south line, pointing north for most of India for most of the year, and the tim - [Moon crater tray that tests how drop height changes crater size](https://engineergurukul.com/resources/project-ideas/moon-crater-impact-flour-tray/): Craters on the Moon were made by rocks hitting its surface. Dropping marbles into flour from different heights shows that faster impacts make wider craters with longer rays, and that the Moon keeps its craters because it - [Cloth windsock that shows wind direction and strength](https://engineergurukul.com/resources/project-ideas/cloth-and-wire-windsock-wind-strength/): A windsock points away from the wind and lifts higher as the wind gets stronger. It is used at airports and can be compared with a Beaufort chart. - [Moon diary: sketching the Moon’s shape and rise time for 30 nights](https://engineergurukul.com/resources/project-ideas/moon-diary-thirty-nights/): The Moon’s lit shape changes in a steady cycle of about 29.5 days, and it rises roughly 50 minutes later each night. Your own sketches show this pattern better than any picture in a book. - [Pebble collection: sort by colour, feel and weight](https://engineergurukul.com/resources/project-ideas/pebble-sorting-by-feel-colour-and-weight/): Rocks and pebbles come from bigger rocks that wear down. They differ in colour, smoothness and weight, and we can sort them by these properties. - [My weather diary with sun, cloud and rain symbols](https://engineergurukul.com/resources/project-ideas/two-week-weather-diary-chart-with-symbols/): Weather changes from day to day. Writing it daily lets us see patterns, such as how many sunny days there were in a week. - [Cloud watching sketch book with cloud shapes](https://engineergurukul.com/resources/project-ideas/cloud-watching-sketch-book/): Clouds come in different shapes and heights, and each kind tells us something about the weather coming. - [Paper windsock that shows wind strength and direction](https://engineergurukul.com/resources/project-ideas/paper-windsock-wind-checker/): A windsock blows out like a flag in the wind. It points away from the wind direction and rises higher when the wind is stronger. - [Map of my room drawn on squared paper](https://engineergurukul.com/resources/project-ideas/map-of-my-room-on-squared-paper/): A map is a picture of a place seen from above, drawn smaller than real. Using squares to stand for steps shows what scale means. - [Picture map from home to school with landmarks](https://engineergurukul.com/resources/project-ideas/home-to-school-picture-map-with-symbols/): A map can show the way with landmarks and symbols. Children learn directions such as left, right, near and far. - [Garden treasure hunt using north, south, east and west](https://engineergurukul.com/resources/project-ideas/garden-treasure-hunt-with-compass-directions/): Directions are named by the Sun and the compass. We find east where the Sun rises, then work out north, south and west. - [Evaporation race: wet cloth in sun, shade and wind](https://engineergurukul.com/resources/project-ideas/evaporation-race-wet-cloth-in-sun-and-shade/): Water dries by evaporation, turning into invisible vapour. Heat and wind make this happen faster. ### Electronics and robotics, Class 1 to 5 - [Conductor or insulator? Tester with one cell and a bulb](https://engineergurukul.com/resources/project-ideas/conductor-or-insulator-tester-with-one-cell-and-bulb/): Some materials let electric current pass and some do not. A bulb lights up when the circuit is complete and a conductor is in the gap. - [Cardboard lighthouse that lights with one cell and a bulb](https://engineergurukul.com/resources/project-ideas/cardboard-lighthouse-with-a-bulb/): A complete circuit with a cell, a bulb and a switch makes light. A lighthouse model shows how light guides ships at night. ### Environment, Class 1 to 5 - [Plastic bottle bird feeder](https://engineergurukul.com/resources/project-ideas/bottle-bird-feeder/): Waste plastic can be reused instead of thrown away, and a feeder lets you observe local birds. Keep a diary of which birds visit and when. - [Food chain and food web model](https://engineergurukul.com/resources/project-ideas/food-chain/): Energy passes from plants to plant-eaters to meat-eaters. Taking one living thing out of the web affects all the others. - [Four-bin waste sorting game with 40 picture cards](https://engineergurukul.com/resources/project-ideas/four-bin-waste-sorting-game/): Household waste belongs in different bins: wet kitchen waste for composting, dry recyclables, hazardous items like batteries and medicines, and sanitary waste. Sorting cards into four coloured bins teaches the habit and - [What rots and what does not: a six-week burial test](https://engineergurukul.com/resources/project-ideas/what-rots-burial-test/): Natural materials such as peels and leaves are broken down by soil organisms within weeks, paper and cotton more slowly over weeks to months, while plastic, foil and glass stay almost unchanged. Burying samples and diggi - [How much water a dripping tap wastes, measured and scaled to a year](https://engineergurukul.com/resources/project-ideas/dripping-tap-water-loss-measure/): A tap that drips once a second seems harmless, but catching the drips for ten minutes and multiplying up shows it wastes well over a thousand litres a year, enough to fill about eight 200-litre drums. Measurement turns a - [Bucket versus running tap: measuring water used for daily tasks](https://engineergurukul.com/resources/project-ideas/bucket-versus-running-tap-comparison/): The same task, such as brushing teeth, washing hands or washing a plate, uses many times more water when the tap runs than when water is taken from a mug or bucket. Measuring both ways gives the family hard numbers for s - [Biodiversity diary of one square metre kept for a month](https://engineergurukul.com/resources/project-ideas/one-metre-square-biodiversity-diary/): Even one square metre of garden or wasteland holds dozens of kinds of living things: grasses, weeds, ants, beetles, spiders, snails, birds that visit. Watching the same patch daily and recording every species shows how r - [Gravity-fed bottle bird feeder that refills itself](https://engineergurukul.com/resources/project-ideas/gravity-fed-bottle-bird-feeder/): Seeds fall under gravity to fill a small tray as birds eat them, so the feeder keeps itself topped up. It shows gravity and also helps garden birds in the hot summer. - [Newspaper roll pencil stand](https://engineergurukul.com/resources/project-ideas/newspaper-roll-pencil-stand/): Old newspaper can be turned into something useful. Reusing paper saves trees and reduces waste. - [Bottle cap mosaic picture of a fish or a flower](https://engineergurukul.com/resources/project-ideas/bottle-cap-mosaic-picture/): Plastic caps can be reused to make art. We sort by colour and see how many small parts make a large picture. - [Egg carton flowers and a crawling caterpillar](https://engineergurukul.com/resources/project-ideas/egg-carton-flowers-and-caterpillar/): Waste egg cartons can be turned into toys and decorations. A caterpillar model also shows the first stage of a butterfly. - [Old sock puppet family for a storytelling show](https://engineergurukul.com/resources/project-ideas/old-sock-puppet-family-for-storytelling/): Old clothes can be reused instead of thrown away. Making puppets and telling stories also builds speaking and imagination. - [Newspaper gift bag to replace plastic bags](https://engineergurukul.com/resources/project-ideas/newspaper-gift-bag-no-plastic/): A strong paper bag can be folded from old newspaper, which cuts down use of plastic bags. Folding and gluing teach geometry too. - [Plastic bottle hanging planter for a small herb](https://engineergurukul.com/resources/project-ideas/plastic-bottle-hanging-planter/): A waste bottle can hold soil and a living plant. Drainage holes let extra water out so roots do not rot. ### Computing and coding, Class 1 to 5 - [Scratch game: catch the falling fruit with a bowl](https://engineergurukul.com/resources/project-ideas/scratch-catch-the-falling-fruit-game/): Variables keep score and lives, and a forever loop with an if block checks again and again whether the fruit touched the bowl. This is the core idea of every simple video game. - [Scratch maze game that senses wall colour](https://engineergurukul.com/resources/project-ideas/scratch-maze-game-arrow-keys-colour-sensing/): The sprite reads the colour under it with the touching colour block, so you can draw any maze and the game still works. It shows how input from the keyboard turns into movement. - [Scratch times-table quiz with random questions and score](https://engineergurukul.com/resources/project-ideas/scratch-times-table-quiz-with-ask-and-answer/): A loop asks random multiplication questions, reads what you type with the answer block and compares it with the right product. It shows how a program takes input and makes decisions. - [Scratch animated story of a monsoon day using broadcasts](https://engineergurukul.com/resources/project-ideas/scratch-monsoon-day-story-with-broadcast-messages/): Broadcast messages let sprites talk to each other, so scenes happen in order without anyone clicking. It shows how separate scripts cooperate in one program. - [Scratch road-crossing safety game with a pedestrian signal](https://engineergurukul.com/resources/project-ideas/scratch-road-crossing-safety-game-traffic-signal/): A signal sprite changes between stop and walk using wait blocks, and a child sprite checks the signal before moving. It teaches road safety and conditional logic together. - [Scratch Hindi to English word game using two lists](https://engineergurukul.com/resources/project-ideas/scratch-hindi-english-word-match-game-with-lists/): Two lists hold matching words at the same positions, and the program picks a random position to ask a question. It shows how lists store related data in order. ### Physics, Class 6 to 8 - [Balloon-powered car](https://engineergurukul.com/resources/project-ideas/balloon-car/): Air rushing backwards out of the balloon pushes the car forwards. This is Newton’s third law: every action has an equal and opposite reaction. - [Simple electric circuit with a switch](https://engineergurukul.com/resources/project-ideas/simple-circuit/): Electricity flows only round a complete loop. The switch opens and closes the loop, turning the bulb off and on. - [Sink or float, and the clay boat](https://engineergurukul.com/resources/project-ideas/sink-or-float/): Whether something floats depends on its density and its shape. A ball of clay sinks, but the same clay shaped into a boat floats, because it pushes aside more water. - [Air pressure holds up water](https://engineergurukul.com/resources/project-ideas/air-pressure-card/): Air pushes on everything around us. When the glass is turned over, the air pressure pushing up on the card is enough to hold the water in. - [CD hovercraft](https://engineergurukul.com/resources/project-ideas/cd-hovercraft/): Air from the balloon forms a thin cushion under the CD. The cushion cuts friction with the table, so the hovercraft glides. - [Hydraulic arm with syringes](https://engineergurukul.com/resources/project-ideas/hydraulic-arm/): Pressure applied to a liquid in a closed system is passed on equally in every direction (Pascal’s law), so pushing one syringe moves its partner and lifts the arm. - [Electromagnet](https://engineergurukul.com/resources/project-ideas/electromagnet/): An electric current in a coil of wire makes a magnetic field. Wound round an iron nail, the coil becomes a magnet you can switch off, and more turns of wire make it stronger. - [Simple electric motor](https://engineergurukul.com/resources/project-ideas/simple-electric-motor/): A coil carrying current in a magnetic field feels a force and turns. Scrape the insulation off one end of the coil wire completely, but off only the top half of the other end: the current then flows for half of each turn - [Periscope](https://engineergurukul.com/resources/project-ideas/periscope/): Light reflects from a plane mirror at the same angle at which it arrives. Two mirrors at 45 degrees send the light down the tube, so you can see over a wall. - [Wind turbine that lights an LED](https://engineergurukul.com/resources/project-ideas/wind-turbine-led/): A small DC motor works as a generator when its shaft is turned: if the blades spin fast enough, the motor turns motion energy into electrical energy that lights the LED. - [Static electricity and a jar electroscope](https://engineergurukul.com/resources/project-ideas/jar-electroscope/): Rubbing a balloon moves electric charge onto it. A charged object attracts light things, and in the electroscope the two foil leaves get the same charge and push apart. - [Pinhole camera](https://engineergurukul.com/resources/project-ideas/pinhole-camera/): Light travels in straight lines, so rays from the top of an object pass through the pinhole and land at the bottom of the screen. The image is upside down. - [Rubber band powered car](https://engineergurukul.com/resources/project-ideas/rubber-band-car/): Winding the rubber band stores elastic potential energy, which turns into motion (kinetic) energy as it unwinds and turns the axle. - [Plastic bottle vacuum cleaner](https://engineergurukul.com/resources/project-ideas/bottle-vacuum-cleaner/): A small fan blows air out of the back of the bottle, lowering the pressure inside, so outside air rushes in through the nozzle carrying dust and paper bits with it. - [Bottle-cap water wheel that lifts a weight](https://engineergurukul.com/resources/project-ideas/bottle-cap-water-wheel-lifts-a-weight/): Falling water pushes on the cups of the wheel and makes it turn. The turning axle winds up a thread and lifts a small weight, so the energy of moving water becomes useful work. - [Thread spool crane with a fixed pulley](https://engineergurukul.com/resources/project-ideas/thread-spool-fixed-pulley-crane/): A single fixed pulley does not make a load lighter, but it changes the direction of the pull, so you lift a load up by pulling down. That is why cranes, flagpoles and wells use pulleys. - [Ruler seesaw: balancing coins at different distances](https://engineergurukul.com/resources/project-ideas/ruler-seesaw-balancing-coins/): A lever balances when the weight times its distance from the pivot is equal on both sides. One coin far from the middle balances two coins placed half as far away. - [Does a steeper ramp need more force? Cardboard ramp test](https://engineergurukul.com/resources/project-ideas/cardboard-ramp-angle-and-pulling-force/): An inclined plane lets you move a load up with less force than lifting it straight, but over a longer distance. The gentler the slope, the smaller the pull needed and the longer the path. - [How a stick’s shadow changes through the day](https://engineergurukul.com/resources/project-ideas/shadow-stick-length-through-the-day/): The shadow of a fixed stick is long in the morning, shortest around midday and long again in the evening, and it swings from west to east as the Sun moves across the sky. Shadow length depends on how high the Sun is. - [Tissue box rubber band guitar: what changes the pitch?](https://engineergurukul.com/resources/project-ideas/tissue-box-rubber-band-guitar-pitch/): Sound is made by vibration. A thin, tight or short rubber band vibrates faster and gives a higher note; a thick, loose or long one vibrates slower and gives a lower note. The hollow box makes the sound louder. - [Water bottle xylophone: pitch and the amount of water](https://engineergurukul.com/resources/project-ideas/glass-bottle-xylophone-water-levels/): Tapping a glass bottle makes the glass and the water vibrate, and more water makes the vibration slower and the note lower. Blowing across the top vibrates the air instead, so the bottle with the most water gives the hig - [Why does a clay ball sink but a clay boat float?](https://engineergurukul.com/resources/project-ideas/clay-boat-shape-and-floating/): The same lump of clay sinks as a ball but floats as a bowl, because the bowl shape pushes aside much more water. Floating depends on the shape and the water displaced, not only on the weight. - [How much salt makes an egg float?](https://engineergurukul.com/resources/project-ideas/egg-floats-in-salt-water-test/): An egg sinks in plain water but floats in salty water. Dissolving salt makes the water denser, so it pushes up harder on the egg. Measuring the salt needed turns a trick into a real experiment. - [Balloon in a bottle: air takes up space](https://engineergurukul.com/resources/project-ideas/balloon-in-a-bottle-air-takes-space/): A balloon hung inside a sealed bottle will not blow up, because the air already in the bottle has nowhere to go. Make a small hole in the bottle and the balloon inflates easily, proving that air is real and takes up spac - [The bottle that crushes itself: air pressure and cooling](https://engineergurukul.com/resources/project-ideas/warm-bottle-crushed-by-cold-water/): A capped bottle of warm air shrinks and crumples when it is cooled quickly, because the cooled air inside takes up less space and presses less, while the air outside keeps pressing in. It shows that air pressure is a rea - [Simple pendulum: does length or weight change the swing time?](https://engineergurukul.com/resources/project-ideas/simple-pendulum-length-and-swing-time/): The time for one swing of a pendulum depends on its length, not on how heavy the bob is or how wide it swings (for small swings). A longer pendulum swings more slowly. Pendulum clocks are built on this rule. - [Which shoe sole grips best? Friction on a tilting ramp](https://engineergurukul.com/resources/project-ideas/shoe-sole-friction-ramp-test/): Friction is the force that stops things sliding. A rough rubber sole needs the board to be tilted much more steeply before it slides than a smooth plastic sole, so the angle at which an object starts to slide is a simple - [Two-spool block and tackle that halves the effort](https://engineergurukul.com/resources/project-ideas/two-spool-block-and-tackle-lift/): A movable pulley hanging with the load shares the weight between two lengths of string, so you need only about half the force to lift it, but you must pull twice as much string. Adding pulleys trades distance for force. - [Floating needle compass that finds north](https://engineergurukul.com/resources/project-ideas/floating-needle-compass-in-a-bowl/): Stroking a steel needle with a magnet turns it into a weak magnet. Floated on water so it can turn freely, the needle lines up north to south, because the Earth itself acts like a giant magnet. - [Mapping a bar magnet’s field with a small compass](https://engineergurukul.com/resources/project-ideas/mapping-a-magnetic-field-with-a-small-compass/): A small compass placed near a bar magnet points along the field at that spot. Joining many such points draws the field lines, which loop from the north pole round to the south pole and crowd together where the field is s - [Paper spiral snake that spins over warm air](https://engineergurukul.com/resources/project-ideas/paper-spiral-snake-rising-warm-air/): Warm air is lighter than cool air and rises. A paper spiral hung above a warm surface spins as the rising air pushes on its sloping coils, showing convection, the way heat spreads in air and water. - [Black tin versus white tin: which gets hotter in the sun?](https://engineergurukul.com/resources/project-ideas/black-and-white-tins-in-the-sun-heat-test/): A dark surface soaks up most of the sunlight that falls on it and gets hot, while a white or shiny surface reflects most of it and stays cooler. This is why we wear light colours in summer and why solar heaters are paint - [Which cup keeps tea hot the longest? Insulation test](https://engineergurukul.com/resources/project-ideas/which-cup-keeps-tea-hot-longest/): Heat flows from hot things to cooler surroundings. Materials like thermocol, cloth and air pockets slow this flow and are called insulators, while metal lets heat through quickly. A lid matters because much heat escapes - [Bottle and straw thermometer that shows expansion](https://engineergurukul.com/resources/project-ideas/bottle-and-straw-liquid-thermometer/): Liquids expand when heated and shrink when cooled. Coloured water in a sealed bottle rises up a narrow straw when the bottle is warmed and falls when it is cooled, which is exactly how a liquid thermometer works. - [Bottle with three holes: water pressure grows with depth](https://engineergurukul.com/resources/project-ideas/bottle-with-three-holes-water-pressure-and-depth/): Water squirts furthest from the lowest hole in a bottle, because the weight of all the water above it presses on it. Pressure in a liquid increases with depth, which is why dam walls are thickest at the bottom. - [Ketchup sachet diver that sinks when you squeeze](https://engineergurukul.com/resources/project-ideas/ketchup-sachet-cartesian-diver/): A sachet with a small air bubble just floats in a bottle of water. Squeezing the bottle raises the pressure, squashes the bubble, and the sachet becomes denser and sinks; let go and it rises. Submarines and fish control - [Ice cream stick catapult: how far does a pom-pom fly?](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-catapult-launch-test/): Pulling the arm down stores energy in the bent stick and rubber bands, and letting go turns it into the motion of the pom-pom. More bend means more stored energy and a longer flight, and the launch angle changes the dist - [Marbles in a ruler groove: passing on a push](https://engineergurukul.com/resources/project-ideas/marbles-in-a-ruler-groove-momentum/): When one marble rolls into a line of touching marbles, one marble shoots off the far end; roll two in and two leave. The push, or momentum, passes right through the line, as in a Newton’s cradle. - [Paper helicopter: wing length and fall time](https://engineergurukul.com/resources/project-ideas/paper-helicopter-wing-length-test/): A strip of paper with two folded wings spins as it falls, because air pushing on the slanted wings makes it turn. Longer wings catch more air and slow the fall, while adding paper clips makes it fall faster. Air resistan - [Plastic bag parachutes: does a bigger canopy fall slower?](https://engineergurukul.com/resources/project-ideas/plastic-bag-parachute-size-test/): A parachute slows a fall because its wide canopy pushes against a lot of air. Bigger canopies take longer to fall with the same load, and a small hole in the top makes the fall steadier instead of swinging. - [Balloon rocket on a string: action and reaction](https://engineergurukul.com/resources/project-ideas/balloon-rocket-on-a-string-line/): Air rushing out of the balloon’s neck pushes the balloon the other way along the string. The bigger the balloon, the further it travels. This is Newton’s third law, the same rule that lifts a real rocket. - [Cardboard marble roller coaster: height, speed and loops](https://engineergurukul.com/resources/project-ideas/cardboard-strip-marble-roller-coaster/): A marble released from high up gains speed as it rolls down, trading height (potential energy) for speed (kinetic energy). It can climb a hill or go round a loop only if it started higher than the top of that hill or loo - [Cardboard bird that balances on a fingertip by its beak](https://engineergurukul.com/resources/project-ideas/balancing-cardboard-bird-on-a-fingertip/): A cardboard bird with coins hidden in its wing tips balances on its beak and even wobbles back upright when pushed. Adding weight far forward and low moves the bird’s centre of gravity to just below the beak, so it canno - [Cardboard castle drawbridge raised by thread and spools](https://engineergurukul.com/resources/project-ideas/cardboard-drawbridge-with-thread-and-spools/): A drawbridge is a lever hinged at one end, raised by threads that run over pulleys at the top of the gate and are wound on an axle. The model shows how a lever, pulleys and a wheel and axle work together to lift a load w - [Village well model: a wheel and axle that lifts a bucket](https://engineergurukul.com/resources/project-ideas/bottle-and-spool-wheel-and-axle-well/): Turning a large wheel moves a small axle with greater force, so a bucket of water can be lifted with a light push on the handle. The bigger the handle circle compared with the axle, the easier the lift but the more turns - [A screw is a wrapped ramp: paper triangle on a pencil](https://engineergurukul.com/resources/project-ideas/paper-triangle-on-a-pencil-screw-model/): Wrapping a paper triangle round a pencil turns its sloping edge into a spiral thread, just like a screw. A screw is an inclined plane wound round a rod, which is why it goes in with little force but needs many turns. - [Wedge test: which blade shape splits clay most easily?](https://engineergurukul.com/resources/project-ideas/wedge-shape-and-splitting-clay-test/): A wedge turns a push on its wide back into strong sideways pushes along its sloping sides, which split material apart. Thin, long wedges split clay with less force than short, blunt ones, which is why knives and axes are - [Three classes of lever on one working board](https://engineergurukul.com/resources/project-ideas/three-classes-of-lever-working-board/): Levers differ by where the fulcrum, load and effort sit. A seesaw has the fulcrum in the middle, a wheelbarrow has the load in the middle, and tongs have the effort in the middle. Three working ice cream stick levers on - [Steel spoon mirrors: why one side flips your face](https://engineergurukul.com/resources/project-ideas/steel-spoon-curved-mirror-reflections/): The back of a shiny spoon is a convex mirror and always shows a small, upright, wide view. The bowl side is a concave mirror: it shows your face upside down from far away and large and upright when very close. - [Kaleidoscope from old CD case strips and a chips tube](https://engineergurukul.com/resources/project-ideas/kaleidoscope-from-cd-case-strips/): Three mirrors set in a triangle reflect light again and again, turning a few coloured beads into a symmetrical pattern of many images. It shows how reflection works and how multiple reflections multiply images. - [Making a rainbow with a mirror in a bowl of water](https://engineergurukul.com/resources/project-ideas/rainbow-from-a-mirror-in-a-bowl-of-water/): Sunlight looks white but is a mixture of colours. Water with a mirror in it acts like a prism, bending each colour by a slightly different amount, so the reflected beam fans out into red, orange, yellow, green, blue, ind - [The bending pencil: refraction in water, oil and glass](https://engineergurukul.com/resources/project-ideas/bent-pencil-in-a-glass-refraction-test/): A pencil standing in a glass of water looks broken at the surface because light bends when it passes from water into air. Different liquids bend light by different amounts, and a coin hidden under the rim of a cup reappe - [Water drop magnifier: a lens from a single drop](https://engineergurukul.com/resources/project-ideas/water-drop-magnifier-on-a-plastic-sheet/): A drop of water on clear plastic has a curved top, like a convex lens, and makes small print look bigger. A rounder, smaller drop magnifies more. It shows how lenses in magnifying glasses, spectacles and microscopes work - [Spinning colour disc: seven colours blend into white](https://engineergurukul.com/resources/project-ideas/spinning-colour-disc-seven-colours-to-white/): A disc painted with the seven rainbow colours looks almost white when spun fast, because the eye cannot keep up and mixes the colours together. White light is a mix of all colours, which is the reverse of a prism splitti - [Twanging ruler: how length changes pitch and loudness](https://engineergurukul.com/resources/project-ideas/twanging-ruler-length-and-pitch/): A ruler held over the edge of a table and twanged vibrates and makes a sound. A short overhang vibrates fast and gives a high note; a long overhang vibrates slowly and gives a low note. A harder twang makes a louder soun - [Cardboard ear trumpet that collects faint sounds](https://engineergurukul.com/resources/project-ideas/cardboard-cone-ear-trumpet-sound-collector/): A wide cone gathers sound waves from a large area and funnels them into the ear, so faint sounds become louder and clearer. Used the other way round, it sends your voice in one direction like a megaphone. - [Which spinning top lasts longest? Paper plate and bottle-cap tops](https://engineergurukul.com/resources/project-ideas/spinning-tops-which-shape-spins-longest/): A top stays upright while it spins fast, then wobbles and falls as friction slows it. Tops with a wide, heavy rim and a sharp point usually spin for longer. - [Egg drop cushion: how much padding keeps a boiled egg whole?](https://engineergurukul.com/resources/project-ideas/egg-drop-cushion-box-impact-time/): A soft cushion makes the egg stop more slowly, so the force on it is smaller. The same change in motion over a longer time means a smaller force. - [Rubbed balloon lifts paper bits and bends a thin stream of water](https://engineergurukul.com/resources/project-ideas/charged-balloon-paper-bits-and-water-stream/): Rubbing a balloon on hair gives it an electric charge. A charged object attracts light things like paper bits and even bends a stream of water. - [Finding the centre of gravity of odd cardboard shapes with a plumb line](https://engineergurukul.com/resources/project-ideas/centre-of-gravity-plumb-line-cardboard-shapes/): Every object has one point where its weight seems to act, the centre of gravity. A shape hung from a pin comes to rest with this point directly below the pin, which lets you find it with a plumb line. - [Which spoon gets hot first? Steel, wood and plastic with butter and beads](https://engineergurukul.com/resources/project-ideas/which-spoon-conducts-heat-best-butter-and-beads/): Heat travels along a solid by conduction. Metals pass heat quickly, while wood and plastic pass it slowly, so a bead stuck on a metal spoon with butter drops off first. - [Convection currents: coloured hot water rising and cold water sinking](https://engineergurukul.com/resources/project-ideas/convection-currents-in-a-tank-coloured-hot-and-cold-water/): Warm water is lighter than cold water, so it rises, while cold water sinks. This movement forms convection currents which carry heat through liquids and air. - [Archimedes’ principle with a rubber band balance and an overflow can](https://engineergurukul.com/resources/project-ideas/archimedes-principle-rubber-band-balance-overflow-can/): An object in water feels lighter. The upward force, the buoyant force, equals the weight of the water it pushes aside, and the rubber band shows it by shrinking. - [Blow over a paper strip and watch it rise: fast air, low pressure](https://engineergurukul.com/resources/project-ideas/blowing-over-a-paper-strip-bernoulli-lift/): When you blow across the top of a paper strip it lifts instead of staying down. Fast-moving air has lower pressure than still air, so the stronger pressure below pushes the paper up. - [Coin drops into a glass when the card is flicked: inertia tricks](https://engineergurukul.com/resources/project-ideas/coin-drop-card-flick-inertia-tablecloth/): Objects keep their state of rest unless a force acts on them. When the card is flicked quickly, the coin does not move sideways and drops straight down into the glass. - [Rolling beats sliding: pencils as rollers under a heavy book](https://engineergurukul.com/resources/project-ideas/rolling-versus-sliding-friction-pencils-and-rubber-band/): It is much easier to roll a load on rollers than to slide it over the surface. A rubber band stretches less when the load rolls, showing that rolling friction is smaller than sliding friction. - [Speed of sound from an echo off a wall, a clap and a stopwatch](https://engineergurukul.com/resources/project-ideas/speed-of-sound-from-an-echo-and-a-stopwatch/): Sound travels at a finite speed, about 340 metres every second in air. A clap that returns as an echo from a far wall lets you work out this speed with only a stopwatch and a tape. - [Why the sky is blue and sunsets are red: milk in water and a torch](https://engineergurukul.com/resources/project-ideas/why-the-sky-is-blue-milk-in-water-and-a-torch/): Tiny particles scatter blue light more than red light. Light through a slightly milky tank looks blue from the side and orange-red from the far end, like a sky and a sunset. - [Which ball bounces highest? Drop height and floor surface test](https://engineergurukul.com/resources/project-ideas/which-ball-bounces-highest-drop-height-and-surface/): A ball stores energy when it is squashed and gives most of it back as it bounces. Different balls and surfaces return different fractions of the energy, so the bounce height changes. - [Cardboard gear train: how gears change speed and direction](https://engineergurukul.com/resources/project-ideas/cardboard-gear-train-speed-and-direction/): Gears pass motion from one shaft to the next. A small gear driving a large one turns it more slowly but with more turning force, and neighbouring gears turn in opposite directions. - [Pepper runs from soap: surface tension and a soap-powered boat](https://engineergurukul.com/resources/project-ideas/pepper-and-soap-surface-tension-boat/): The surface of water behaves like a thin stretched skin. Soap weakens this skin where it touches, so the stronger pull from the surrounding water drags the floating pepper outwards. - [Rolled newspaper tube bridge: how much can it carry?](https://engineergurukul.com/resources/project-ideas/newspaper-tube-bridge-load-test/): A flat sheet of paper bends easily, but the same paper rolled into a tube becomes strong. The bridge shows how shape, not material, decides strength. - [Arch bridge versus beam bridge from cardboard strips](https://engineergurukul.com/resources/project-ideas/cardboard-arch-versus-beam-bridge/): An arch pushes sideways on its supports and carries a load by compression. A flat beam of the same material sags because the bottom is stretched. - [CD and balloon hovercraft that glides on a cushion of air](https://engineergurukul.com/resources/project-ideas/cd-balloon-hovercraft-glides-on-air/): A thin layer of air under the disc removes most friction, so the hovercraft slides a long way with a tiny push. It shows how reducing friction changes motion. - [CD and paper Newton colour disc that turns white when spun](https://engineergurukul.com/resources/project-ideas/cd-newton-colour-disc-spinner/): White light is a mixture of the seven spectrum colours. When a disc painted in rainbow sectors spins fast, the eye blends the colours and sees a pale white or grey. - [Tin-can telephone: does a tight string carry sound better?](https://engineergurukul.com/resources/project-ideas/tin-can-telephone-string-tension-test/): Sound travels along a taut string as vibrations. A loose string cannot carry the vibration well, so the voice becomes faint. - [Drinking straw pan pipes: tube length and pitch](https://engineergurukul.com/resources/project-ideas/drinking-straw-pan-pipes-pitch/): A shorter air column vibrates faster and gives a higher pitch. Seven straws of different lengths make a simple scale. - [Cardboard model houses with different roofs: which stays cooler?](https://engineergurukul.com/resources/project-ideas/cardboard-house-roof-insulation-heat-test/): A roof of insulating material like thermocol slows the passage of heat into the house, so the inside stays cooler. The test compares four roof types. - [Rubber-band powered cardboard car on CD wheels](https://engineergurukul.com/resources/project-ideas/rubber-band-cardboard-car-cd-wheels/): A twisted rubber band stores elastic energy that turns the axle and moves the car. Winding it more stores more energy and the car goes farther. - [Paddle-wheel boat from a bottle and a rubber band](https://engineergurukul.com/resources/project-ideas/bottle-cap-paddle-wheel-rubber-band-boat/): The wheel pushes water backwards and the water pushes the boat forward, as in Newton’s third law. The twisted rubber band supplies the energy. - [Archimedes screw water lifter from a bottle and a plastic tube](https://engineergurukul.com/resources/project-ideas/bottle-and-hose-archimedes-screw-water-lifter/): Turning a spiral of tube lifts water uphill without a pump. The device is a screw that lifts water in a few turns, used for thousands of years. - [Pot-in-pot clay cooler: how evaporation keeps food cool](https://engineergurukul.com/resources/project-ideas/pot-in-pot-evaporative-cooler-test/): Water evaporating from wet sand between two clay pots takes heat from the inner pot. The test shows a temperature drop with no electricity. - [Pinhole camera from a chips tube that shows an upside-down world](https://engineergurukul.com/resources/project-ideas/chips-tube-pinhole-camera-upside-down-image/): Light travels in straight lines, so light from the top of an object goes to the bottom of the screen through a tiny hole. The image on the screen is upside down. - [Milk carton periscope that lets you see round corners](https://engineergurukul.com/resources/project-ideas/milk-carton-periscope-with-two-mirrors/): Two mirrors set at 45 degrees reflect light twice and bring the view from a higher point to your eye. It shows the laws of reflection. - [Ice-cream stick tilt maze: guiding a marble by gravity](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-tilt-maze-rolling-marble/): A marble always rolls downhill. Tilting the board changes its direction and speed, so the player has to plan the slopes. - [Rubber-band spring balance with a cardboard scale and straw pointer](https://engineergurukul.com/resources/project-ideas/rubber-band-spring-balance-cardboard-scale/): The stretch of a rubber band grows with the load. A scale marked with known weights turns it into a simple balance that measures weight. - [Pizza box solar oven that warms a cup of water](https://engineergurukul.com/resources/project-ideas/pizza-box-solar-oven-warm-water/): Foil reflects sunlight into the box, a clear cover traps heat, and a black cup absorbs it. The test shows how reflection, absorption and trapping of heat make a solar cooker. - [Balloon-skin tin can drum where sound makes rice dance](https://engineergurukul.com/resources/project-ideas/tin-can-balloon-drum-dancing-rice/): Sound is a vibration. When a loud sound hits the stretched balloon, it vibrates and makes grains of rice jump, so we can see the vibration. - [Popcorn: does soaking the kernels change how many pop?](https://engineergurukul.com/resources/project-ideas/popcorn-moisture-and-popping-rate/): Each popcorn kernel holds a tiny drop of water. When heated, the water turns to steam and builds pressure until the hard shell bursts. You test dry, lightly soaked and over-soaked kernels and count the percentage that po - [Cooking time against size: potato cubes in boiling water](https://engineergurukul.com/resources/project-ideas/potato-cube-size-and-boiling-time/): Heat moves into a potato from the outside by conduction, so a bigger piece takes much longer to cook through. By boiling cubes of different sides and noting when a fork goes in, you find the link between size and cooking - [What dries clothes fastest: sun, shade, wind or folding?](https://engineergurukul.com/resources/project-ideas/clothes-drying-rate-thickness-wind/): Water leaves wet cloth by evaporation, which speeds up with heat, wind and open surface area. You hang identical wet cloths in different conditions and weigh them each hour to find which dries fastest. - [Shadow size against torch distance: similar triangles at home](https://engineergurukul.com/resources/project-ideas/torch-shadow-size-and-distance-ratio/): Light travels in straight lines, so the shadow of an object grows larger as the torch moves closer. Measuring several distances and comparing ratios shows that the shadow follows similar triangles. - [How tall must a mirror be to see your whole body?](https://engineergurukul.com/resources/project-ideas/bathroom-mirror-height-to-see-full-self/): To see your whole body in a flat mirror, the mirror need be only half as tall as you, and it does not depend on how far you stand. You test this with a small mirror, a tape and a friend. - [Glass bottle xylophone: water level and pitch](https://engineergurukul.com/resources/project-ideas/steel-glass-and-bottle-xylophone-pitch/): The pitch of a note from a tapped bottle depends on the amount of water in it: more water gives a lower note when tapped. You tune bottles into a scale and learn how vibration speed sets pitch. - [Ruler twang: how overhang length changes pitch](https://engineergurukul.com/resources/project-ideas/ruler-overhang-pitch-and-vibration/): A ruler pressed on a table and plucked gives a higher note when less of it hangs over the edge. By counting vibrations per second for each overhang length, you find how length controls frequency. - [How many sheets of paper can a fridge magnet still hold?](https://engineergurukul.com/resources/project-ideas/fridge-magnet-sheets-of-paper-strength/): The pull of a magnet gets weaker as the gap between it and the steel grows. By stacking sheets between a magnet and a steel surface, you measure how quickly magnetic force falls with distance. - [Coat hanger balance: weigh sugar, salt and rice by comparison](https://engineergurukul.com/resources/project-ideas/coat-hanger-balance-weighs-kitchen-items/): A balance compares two masses by checking that they pull equally on both sides of a pivot. You build one from a hanger and use it with a reference weight to measure the mass of kitchen items. - [Water siphon from a kitchen tube: height difference and flow rate](https://engineergurukul.com/resources/project-ideas/kitchen-tubing-water-siphon-height-and-flow/): A siphon moves water up and over a barrier without a pump, because the longer falling column of water pulls the liquid along. You measure how the height difference between two buckets changes the flow rate. - [The stuck jar lid: why warm water loosens a metal cap](https://engineergurukul.com/resources/project-ideas/stuck-jar-lid-hot-water-expansion/): Metals expand when heated, and a thin metal lid heats faster than the glass jar below it. A tight cap that will not turn becomes loose after a short dip in warm water, which shows thermal expansion at work. - [Which surface colour heats up fastest in the sun? Four can test](https://engineergurukul.com/resources/project-ideas/surface-colour-and-sunlight-heating-cans/): Dark and dull surfaces absorb more sunlight than light and shiny ones. The temperature rise of equal cans of water under the same sun shows which colour is best for a solar heater and which suits a roof. - [Vertical Savonius turbine from two halves of a plastic bottle](https://engineergurukul.com/resources/project-ideas/savonius-bottle-wind-turbine-spins-in-a-fan-breeze/): A vertical-axis wind turbine spins whichever way the wind blows. The curved half-bottle blades catch more push on the open side than the round side, so the rotor keeps turning. - [Overshot against undershot water wheel lifting the same load](https://engineergurukul.com/resources/project-ideas/overshot-against-undershot-water-wheel-test/): Water can turn a wheel by weight from above (overshot) or by push from below (undershot). Timing how fast each wheel lifts a small weight shows which uses water more efficiently. - [Hand-crank generator: voltage against cranking speed](https://engineergurukul.com/resources/project-ideas/hand-crank-generator-lights-an-led-from-a-toy-motor/): Turning a small DC motor by hand makes a voltage, so the motor acts as a generator. Faster cranking gives higher voltage and brighter light, showing that mechanical energy changes into electrical energy. - [Pot-in-pot clay cooler that keeps vegetables fresh without electricity](https://engineergurukul.com/resources/project-ideas/zeer-pot-clay-pot-in-pot-cooler-for-vegetables/): Water evaporating from wet sand between two clay pots cools the inner pot. This is how farmers can store vegetables cooler without a fridge. - [Sprinkler irrigation model from a drilled pipe and a bucket head](https://engineergurukul.com/resources/project-ideas/sprinkler-irrigation-model-from-a-drilled-pipe/): A rotating or fixed sprinkler spreads water as small jets over a field. The model shows how water pressure, hole size and height decide how far and how evenly water falls. - [Canal lock model that lifts a boat between two water levels](https://engineergurukul.com/resources/project-ideas/canal-lock-model-lifts-a-paper-boat-between-levels/): A lock raises or lowers boats by letting water in or out of a chamber between gates. The model shows how water finds its own level and moves a boat with no engine lift. - [Archimedes screw water lifter from a bottle and a coil of tube](https://engineergurukul.com/resources/project-ideas/archimedes-screw-water-lifter-from-a-bottle-and-tube/): A screw turning in a tilted tube lifts water upward, an idea used for thousands of years to irrigate fields. The model shows how a simple machine moves water uphill without a motor. - [Hand pump model from a bottle, tube and two one-way flaps](https://engineergurukul.com/resources/project-ideas/bottle-hand-pump-model-with-two-one-way-flaps/): A hand pump uses a piston and one-way valves to lift water from a well. The model shows how pushing and pulling the handle makes water move in one direction. - [Straw rocket launcher: which fin shape flies the farthest?](https://engineergurukul.com/resources/project-ideas/straw-rocket-fin-shapes-flight/): A paper rocket is pushed off by a puff of air, and its fins keep it pointing straight. Changing only the fin shape while keeping everything else the same is a fair test of how fins help flight. - [Gaganyaan-style crew capsule with a parachute to land an egg astronaut](https://engineergurukul.com/resources/project-ideas/gaganyaan-capsule-parachute-egg-drop/): A crew capsule coming back from space is slowed by a parachute and lands softly. A larger parachute canopy gives more air drag and a slower fall, which protects the passenger. - [Bounce height of cricket, tennis and rubber balls on grass, concrete and sand](https://engineergurukul.com/resources/project-ideas/ball-bounce-cricket-tennis-rubber-surfaces/): How high a ball bounces depends on both the ball and the surface. Some of the ball’s energy is lost as sound, heat and a dent in the surface at each bounce, which explains why pitches matter in cricket. - [Flat sole, studs and spikes: friction on a muddy tray](https://engineergurukul.com/resources/project-ideas/studs-flat-sole-spikes-muddy-tray-friction/): Friction is the force that stops a shoe from slipping. On wet mud, the grip depends on the sole pattern, because studs and spikes dig in and rubber flat soles slide on a film of water. - [Ruler-drop reaction time: dominant hand, other hand and a warning sound](https://engineergurukul.com/resources/project-ideas/ruler-drop-reaction-time-dominant-hand/): The distance a ruler falls before you catch it tells how fast you react. Comparing hands and signals shows what can speed up or slow down a response, which is important in cricket and sprint starts. - [Paper planes: dart, glider and wide-wing flight distance and time](https://engineergurukul.com/resources/project-ideas/paper-plane-dart-glider-wing-flight-test/): A paper plane flies by gliding: its wings make lift and the nose is pushed forward by the throw, while drag slows it. Different shapes trade speed for glide time. - [Kite flying physics: tail length, string angle and wind speed](https://engineergurukul.com/resources/project-ideas/kite-flying-physics-tail-angle-wind/): A kite stays up because the wind pushes on it at an angle. The forces of wind, weight and string tension balance. A longer tail steadies the kite, and a higher wind speed raises the string angle. - [Balance point of a cricket bat, a hockey stick and a broom handle](https://engineergurukul.com/resources/project-ideas/bat-and-hockey-stick-balance-point/): Every object has a balance point, the centre of gravity, where its weight seems to act. In sports equipment it is not at the middle, and where it lies changes how the object feels in the hand. - [Standing long jump: does an arm swing add distance?](https://engineergurukul.com/resources/project-ideas/standing-long-jump-arm-swing-data/): The distance of a jump depends on the take-off speed and angle. Swinging the arms adds to the speed of the body’s launch, which is why athletes use them. - [30 metre sprint speeds of a class timed with a pair of stopwatches](https://engineergurukul.com/resources/project-ideas/sprint-30m-timing-gate-class-speeds/): Average speed equals distance divided by time. Timing a short run shows differences in speed in a class, and also how reaction time of the timekeeper can add error. - [Playground seesaw: where must two children sit to balance?](https://engineergurukul.com/resources/project-ideas/playground-seesaw-where-children-sit-balance/): A seesaw balances when the turning effect (moment) on one side equals that on the other. A lighter child must sit farther from the pivot to balance a heavier child. - [Carrom striker slide: how powder changes friction and stopping distance](https://engineergurukul.com/resources/project-ideas/carrom-striker-powder-friction-slide/): Carrom players sprinkle fine powder on the board to make the striker glide. Measuring how far a striker slides with and without powder shows how a thin layer lowers friction. - [Which fruits and vegetables float? Predict and test](https://engineergurukul.com/resources/project-ideas/fruit-and-vegetable-float-chart-predict-and-test/): Some fruits and vegetables float and some sink in water, depending on how much of the body is air and how heavy it is for its size. Predicting before testing is how scientists work. - [Foil boat: how many coins can it carry before it sinks?](https://engineergurukul.com/resources/project-ideas/foil-boat-how-many-coins-before-it-sinks/): The shape of a boat decides how much it can carry. A wide boat with high sides pushes aside more water and so carries more than a flat sheet. - [Magnet pole push: two toy cars that chase and run away](https://engineergurukul.com/resources/project-ideas/magnet-pole-push-race-cars/): Every magnet has two poles. Unlike poles pull together and like poles push apart, and we can use the push to move a small car without touching it. - [Torch and coloured cellophane: mixing lights on a wall](https://engineergurukul.com/resources/project-ideas/torch-and-cellophane-light-colour-mixing/): Coloured light mixes differently from paint. Where beams of red, green and blue light overlap, we see new colours, and all three together look almost white. - [Toy shadow length: does a higher torch make a shorter shadow?](https://engineergurukul.com/resources/project-ideas/toy-shadow-length-and-torch-height/): The length of a shadow depends on where the light is. A high light gives a short shadow and a low light gives a long one, like the Sun at noon and in the evening. - [Toy car ramp: does a steeper slope make the car go farther?](https://engineergurukul.com/resources/project-ideas/toy-car-ramp-height-and-distance-rolled/): A car rolling down a slope speeds up. A steeper ramp gives it more speed, so it rolls farther along the floor. - [Cardboard gears with paper teeth that turn each other](https://engineergurukul.com/resources/project-ideas/cardboard-gears-with-paper-teeth/): Two gears with teeth that mesh turn in opposite directions, and a small gear spins faster than a big one. - [Drinking straw whistle: shorter straw, higher sound](https://engineergurukul.com/resources/project-ideas/drinking-straw-whistle-pitch-changer/): Sound is made by vibrations. A shorter vibrating column of air gives a higher sound, and a longer one gives a lower sound. - [Does sound travel through water? The spoon and bowl test](https://engineergurukul.com/resources/project-ideas/sound-through-water-spoon-tap-test/): Sound can travel through liquids and solids as well as air. In water it travels even faster than in air. - [Feel your voice: humming throat and dancing salt on cling film](https://engineergurukul.com/resources/project-ideas/feel-your-voice-humming-and-sound-sprinkle/): Voice is a vibration. We can feel it in the throat and see the vibration make salt grains jump on a stretched sheet. - [Ice cube melting: sun, shade, cloth and steel plate](https://engineergurukul.com/resources/project-ideas/ice-cube-melting-in-sun-shade-and-cloth/): Heat melts ice. The speed of melting depends on how warm the place is and whether the ice is covered or not. - [Does water take up more room when it freezes?](https://engineergurukul.com/resources/project-ideas/does-freezing-water-need-more-room-bottle-test/): Water expands a little when it freezes. Ice takes up more space than the same water, which is why ice floats. - [Simple diamond paper kite and a flying test](https://engineergurukul.com/resources/project-ideas/simple-diamond-paper-kite-flying-test/): A kite flies because wind pushes on it at a slant and string holds it. The tail keeps it steady. - [Paper plane race: which fold flies the farthest?](https://engineergurukul.com/resources/project-ideas/paper-plane-folds-distance-race/): Wing shape and fold change how far a plane flies. A fair test means launching each plane the same way and measuring the distance. - [Paper clip on the nose: does weight help a plane glide?](https://engineergurukul.com/resources/project-ideas/paper-clip-weighted-plane-nose-weight-test/): The position of weight changes how a plane flies. A little weight in the front makes it steady, but too much makes it dive. - [Static comb: lifting paper bits and bending a water stream](https://engineergurukul.com/resources/project-ideas/static-comb-and-paper-bits-dance/): Rubbing some things together gives them an electric charge, called static electricity. A charged comb can pull tiny paper bits and bend a thin water stream. - [Rain stick from a cardboard tube: the sound of falling rain](https://engineergurukul.com/resources/project-ideas/rain-stick-from-a-cardboard-tube/): Many grains falling past obstacles make a sound like rain. We hear the vibrations of grains hitting the tube walls and the pins. - [Long spring waves: transverse and longitudinal pulses you can see](https://engineergurukul.com/resources/project-ideas/long-spring-transverse-and-longitudinal-waves/): A long coiled spring or a stretched coil of telephone cord can carry two kinds of waves: sideways shakes make transverse waves and push-pull shakes make longitudinal waves. In both, the wave travels along but the coils o - [Which rubbing makes the strongest charge? Balloon and paper bits test](https://engineergurukul.com/resources/project-ideas/rubbed-balloon-material-ranking-paper-bits/): Rubbing a balloon with different materials gives different amounts of static charge, and a charged balloon picks up small paper bits. Counting the bits lifted ranks the materials from weak to strong charging. - [Butter on spoon handles: which material conducts heat fastest?](https://engineergurukul.com/resources/project-ideas/butter-on-spoons-heat-conduction-race/): Spoons of steel, aluminium, wood and plastic with butter dabbed on the handles are placed in hot water, and the butter melts and drops first on the best conductor. It shows that metals conduct heat well and wood and plas - [Convection currents drawn with food colour in hot and cold water](https://engineergurukul.com/resources/project-ideas/convection-currents-food-colour-hot-and-cold-water/): Hot water is lighter than cold water, so hot coloured water released into cold water rises in a stream, while cold coloured water released into warm water sinks. This movement of a fluid carrying heat is convection and d ### Chemistry, Class 6 to 8 - [Rainbow in a glass (density tower)](https://engineergurukul.com/resources/project-ideas/density-rainbow/): Water with more sugar dissolved in it is denser, so it sinks below water with less sugar. Layers of differently sweetened, coloured water stack up like a rainbow. - [Erupting volcano model](https://engineergurukul.com/resources/project-ideas/erupting-volcano/): Vinegar (an acid) reacts with baking soda (a base) and gives off carbon dioxide gas, which pushes the foam out. Real volcanoes erupt molten rock, so the model shows the shape of a volcano, not its cause. - [Red cabbage indicator](https://engineergurukul.com/resources/project-ideas/red-cabbage-indicator/): Red cabbage juice changes colour with acids and bases: pink or red in acids, purple when neutral, and blue, green or yellow in bases. - [Lemon and potato battery](https://engineergurukul.com/resources/project-ideas/fruit-battery/): Two different metals in an acidic juice make an electric cell, turning chemical energy into electrical energy. One lemon gives less than one volt, so several are joined in series (the copper of one to the zinc of the nex - [What makes iron rust?](https://engineergurukul.com/resources/project-ideas/what-makes-iron-rust/): Iron rusts only when both air (oxygen) and water are present, and salt water speeds it up. Nails kept dry, or in boiled water sealed with a layer of oil, stay bright. - [Paper chromatography of inks](https://engineergurukul.com/resources/project-ideas/ink-chromatography/): Many inks are mixtures of colours. As water climbs the paper, each colour travels a different distance, depending on how well it dissolves and how strongly it sticks to the paper. - [Turmeric paper strips that spot soaps and acids](https://engineergurukul.com/resources/project-ideas/turmeric-paper-strips-acid-base-tester/): Turmeric contains a yellow dye called curcumin that turns reddish brown in a base such as soap water and stays yellow in an acid such as lemon juice. Home-made turmeric strips work like litmus paper and let you sort kitc - [Hibiscus petal indicator with a kitchen colour chart](https://engineergurukul.com/resources/project-ideas/hibiscus-petal-indicator-colour-chart/): The red pigment in hibiscus (gudhal) petals is an anthocyanin that turns pink red in acids and greenish or dark in bases. By testing kitchen liquids you can build a colour chart that places each liquid roughly on a scale - [Growing sugar crystals on a string, like mishri](https://engineergurukul.com/resources/project-ideas/sugar-crystals-on-a-string-mishri/): Hot water dissolves far more sugar than cold water. As a very strong sugar solution cools and slowly loses water, the extra sugar comes out of solution as crystals that grow on a string, which is exactly how mishri is ma - [Alum (fitkari) crystal geode inside an eggshell](https://engineergurukul.com/resources/project-ideas/alum-crystal-geode-in-an-eggshell/): Alum dissolves easily in hot water and much less in cold water. A saturated alum solution left in half an eggshell slowly deposits sparkling crystals on the shell wall, making a model of a geode, the hollow rocks lined w - [Stirring or warm water: which dissolves sugar faster?](https://engineergurukul.com/resources/project-ideas/stirring-or-warm-water-dissolves-sugar-faster/): Dissolving gets faster when the water is warmer, when the liquid is stirred, and when the sugar is in smaller pieces. A fair test with a stopwatch shows which of these three has the biggest effect. - [Separating a mixture of sand, salt and iron filings](https://engineergurukul.com/resources/project-ideas/separating-sand-salt-and-iron-filings-mixture/): A mixture keeps the properties of each part, so each part can be removed by a method that suits it: a magnet for iron, dissolving for salt, filtering for sand and evaporation to get the salt back. The project shows four - [Measuring the gas from baking soda and vinegar with a balloon](https://engineergurukul.com/resources/project-ideas/baking-soda-vinegar-balloon-gas-measure/): Baking soda and vinegar react to make carbon dioxide gas, which inflates a balloon fitted over the bottle. Using more baking soda makes a bigger balloon, until the vinegar is used up and extra baking soda does nothing. - [Lemon juice invisible ink revealed with a warm iron](https://engineergurukul.com/resources/project-ideas/lemon-juice-invisible-ink-revealed-by-iron/): Lemon juice dries clear on paper, but gentle heat from a clothes iron turns the written lines brown before the rest of the paper changes. The acid in the juice weakens the paper fibres, so they scorch at a lower temperat - [Chromatography of the colours in candy coatings](https://engineergurukul.com/resources/project-ideas/candy-coating-colour-chromatography/): The coloured coating on candies such as Gems is often a mixture of several food dyes. Water climbing up filter paper carries the dyes at different speeds, so a single dot of colour spreads into separate bands and shows w - [Lava bottle with oil, water and a fizzing tablet](https://engineergurukul.com/resources/project-ideas/oil-water-fizzing-tablet-lava-bottle/): Oil floats on water because it is less dense, and the two do not mix. A piece of fizzing antacid tablet (ENO or similar) dropped in makes carbon dioxide bubbles that lift blobs of coloured water up through the oil and le - [Floating egg: how many spoons of salt does it take?](https://engineergurukul.com/resources/project-ideas/floating-egg-how-much-salt-does-it-take/): A fresh egg sinks in plain water but floats once enough salt is dissolved, because dissolving salt makes the water denser than the egg. Counting the spoons needed turns a trick into a measurement of density. - [Which coating stops a nail from rusting?](https://engineergurukul.com/resources/project-ideas/which-coating-stops-a-nail-rusting/): Iron rusts when both water and air reach it. Coating a nail with oil, paint, nail polish, wax or petroleum jelly keeps them away. Comparing coated nails with a bare one over ten days shows which coating protects best and - [Cleaning copper coins with vinegar, then growing green patina](https://engineergurukul.com/resources/project-ideas/copper-coin-cleaning-and-green-patina/): Dull old copper or brass coins shine again in a dip of vinegar and salt, because the acid dissolves the dark copper oxide layer. If the coins are then left wet with vinegar in the air, a blue green coating forms, the sam - [Milk plastic buttons made with vinegar (casein)](https://engineergurukul.com/resources/project-ideas/milk-plastic-casein-buttons/): Adding vinegar to hot milk makes the milk protein casein clump into curds. Pressed and dried, the curds set into a hard, mouldable plastic. Buttons and ornaments were made this way before petroleum plastics existed. - [Cleaning muddy water by settling, decanting and filtering](https://engineergurukul.com/resources/project-ideas/cleaning-muddy-water-settle-decant-filter/): Muddy monsoon water can be made clear in stages: heavy soil settles, the clearer water is poured off, and a home-made sand and cloth filter removes the fine particles. The water looks clean but is still not safe to drink - [Evaporation race: water, hand sanitiser and oil on a plate](https://engineergurukul.com/resources/project-ideas/evaporation-race-water-sanitiser-oil/): Equal drops of water, alcohol-based hand sanitiser and cooking oil evaporate at very different speeds: the sanitiser disappears in minutes, water takes much longer, and oil hardly at all. The difference shows how strongl - [Fizzing sherbet powder from citric acid and baking soda](https://engineergurukul.com/resources/project-ideas/fizzing-sherbet-powder-citric-acid-soda/): Dry citric acid and baking soda do nothing together, but the moment they get wet, on the tongue or in water, they react and release carbon dioxide bubbles. The project shows that many reactions need water to start, and l - [Naked bouncy egg: vinegar dissolves the shell](https://engineergurukul.com/resources/project-ideas/naked-bouncy-egg-vinegar-dissolves-shell/): An eggshell is calcium carbonate, which reacts with the acid in vinegar and fizzes away as carbon dioxide, leaving the egg held only by its soft membrane. The rubbery egg also swells, showing that water passes into it th - [Baking soda, baking powder or neither: which cupcake rises?](https://engineergurukul.com/resources/project-ideas/baking-soda-vs-baking-powder-cupcake-rise/): Cakes rise because gas bubbles form in the batter. Baking powder contains both an acid and a base and makes gas on its own when wet and heated; baking soda alone needs an acid like curd or lemon in the batter. Baking fou - [Home-made bath bombs: fizz time in warm and cold water](https://engineergurukul.com/resources/project-ideas/bath-bomb-fizz-time-warm-vs-cold-water/): A bath bomb is a pressed mix of baking soda and citric acid held together by a little oil. Dropped in water it fizzes as carbon dioxide forms. Timing identical bombs in cold and warm water shows that the same reaction ru - [Chalk and marble chips in vinegar: a model of acid rain damage](https://engineergurukul.com/resources/project-ideas/chalk-and-marble-in-vinegar-acid-rain-model/): Natural chalk and marble are both calcium carbonate, which acid rain slowly eats away on old buildings such as the Taj Mahal. Pieces in vinegar fizz and lose mass, while pieces in plain water stay unchanged, so the loss - [Testing kitchen foods for starch with diluted iodine](https://engineergurukul.com/resources/project-ideas/iodine-starch-test-kitchen-foods/): A drop of diluted tincture of iodine turns blue black on anything that contains starch, such as potato, rice and bread, and stays brown on foods without starch, such as cheese or oil. It is a quick chemical test that sor - [Frost on a tin can using only ice and salt](https://engineergurukul.com/resources/project-ideas/frost-on-a-tin-with-ice-and-salt/): Crushed ice mixed with salt gets colder than ice alone, below the freezing point of water. The outside of a tin filled with the mix becomes so cold that water vapour from the air freezes on it as a white frost, which nev - [Does dissolved sugar still weigh the same?](https://engineergurukul.com/resources/project-ideas/does-dissolved-sugar-still-weigh-the-same/): When sugar disappears into water, its mass does not disappear: the sugar water weighs exactly as much as the sugar and the water did separately. Weighing before and after shows that dissolving spreads the sugar out but d - [Yeast and sugar balloon: which sweetener makes most gas?](https://engineergurukul.com/resources/project-ideas/yeast-sugar-balloon-which-sugar-feeds-best/): Yeast feeds on sugar and releases carbon dioxide gas, which inflates a balloon over the bottle. Comparing plain sugar, jaggery, honey and an artificial sweetener shows which foods the yeast can actually turn into gas, th - [Ice cream in a bag: why salted ice gets colder than ice](https://engineergurukul.com/resources/project-ideas/ice-cream-in-a-bag-freezing-point/): Salt dissolving in the thin layer of melt water on ice lowers its freezing point, so the ice bath drops below 0 C and freezes a sweet milk mixture into soft ice cream. A thermometer shows how much colder salted ice gets. - [Baking soda or baking powder: which makes more bubbles?](https://engineergurukul.com/resources/project-ideas/baking-soda-against-baking-powder-fizz-test/): Baking soda needs an acid to give carbon dioxide, while baking powder already has its own acid and only needs water. Testing both with vinegar, curd water and plain water shows why recipes pick one or the other. - [Why apple slices turn brown and what stops it](https://engineergurukul.com/resources/project-ideas/apple-browning-lemon-juice-test/): A cut apple turns brown when enzymes in it react with oxygen in the air. Lemon juice, salt water, sugar water and cold slow or stop the change, which shows how cooks keep fruit looking fresh. - [Which kitchen ingredient keeps oil and water mixed?](https://engineergurukul.com/resources/project-ideas/kitchen-emulsifiers-oil-and-water-test/): Oil and water do not mix, but some kitchen ingredients called emulsifiers surround the tiny oil drops and keep them spread in the water. You shake the oil and water with different ingredients and time how long they take - [Hot water against cold water: how fast tea colour spreads](https://engineergurukul.com/resources/project-ideas/hot-and-cold-brew-tea-colour-spread/): Particles move faster in hot water, so colour from a tea bag spreads, or diffuses, much faster there than in cold water. Measuring the time to colour a glass shows how temperature affects diffusion and dissolving. - [Candy colour race: hidden dyes in coated sweets](https://engineergurukul.com/resources/project-ideas/candy-colour-race-coffee-filter/): Coloured sweets often use a mix of dyes, and water carrying them up paper moves different dyes at different speeds. You split the colours of several sweets and learn how to separate a mixture without any chemicals. - [Which liquid removes turmeric and tea stains from cotton?](https://engineergurukul.com/resources/project-ideas/stain-removal-turmeric-tea-on-cotton/): Different stains need different cleaners: tea stains respond to mild acids and detergents, while turmeric responds to sunlight and detergent. You test cleaning liquids on identical stains and score the result. - [Longer-lasting soap bubbles with glycerine or sugar](https://engineergurukul.com/resources/project-ideas/soap-bubble-lifetime-glycerine-sugar/): A soap bubble is a thin film of water held between two layers of soap. Adding glycerine or sugar slows the evaporation of the water, so the bubbles live longer. You time bubble lifetimes for different recipes. - [Which fabric soaks up the most water: cotton, nylon, wool or polyester?](https://engineergurukul.com/resources/project-ideas/fabric-absorbency-towel-cotton-nylon/): Cotton and wool fibres absorb a lot of water, while nylon and polyester absorb little. By weighing identical fabric squares before and after soaking, you find which fabric is best for towels and which for raincoats. - [Flour paste, rice paste and school glue: which sticks hardest?](https://engineergurukul.com/resources/project-ideas/home-made-paste-against-fevicol-hanging-load/): Glues stick by filling the tiny gaps in the surfaces and hardening, and starch paste from the kitchen works for paper. You compare the strength of flour paste, rice paste and school glue by hanging load from glued strips - [Are all steel utensils magnetic? Testing a kitchen full of metals](https://engineergurukul.com/resources/project-ideas/are-steel-utensils-magnetic-stainless-grades/): Plain iron and some kinds of steel are attracted by a magnet, but many stainless steels with nickel are not, or only slightly. By testing kitchen items you learn why steel types differ and how to sort the metals around y - [pH of garden, farm and roadside soil using red cabbage indicator](https://engineergurukul.com/resources/project-ideas/ph-of-garden-farm-and-roadside-soil-with-cabbage-indicator/): Soils can be acidic, neutral or alkaline, and crops grow best in a suitable range. A homemade indicator sorts soils from different places by colour. - [Walking rainbow: colours that climb a paper towel](https://engineergurukul.com/resources/project-ideas/walking-rainbow-paper-towel-colours/): Water climbs up paper and carries colours with it. When red and yellow meet in the middle they make orange, and blue and yellow make green. - [Water drops on a coin: how many drops fit?](https://engineergurukul.com/resources/project-ideas/water-drops-on-a-coin-and-wax-paper/): Water drops hold together like a skin and make a dome. A coin can hold many drops before the water spills over. - [What dissolves in water? A kitchen tray test](https://engineergurukul.com/resources/project-ideas/what-dissolves-in-water-kitchen-tray-test/): Some things disappear in water, such as salt and sugar, and some do not, such as sand and flour. We call the first group soluble. - [Soap bubble wands: do square wands make square bubbles?](https://engineergurukul.com/resources/project-ideas/soap-bubble-wands-in-different-shapes/): Bubbles are always round, whatever the shape of the wand. Soap film pulls itself into the shape with the least surface, which is a sphere. - [Why diet cans float and regular cans sink: sugar and density](https://engineergurukul.com/resources/project-ideas/diet-and-regular-cans-float-or-sink/): Sealed cans of regular and diet soft drinks look the same, but in a tub of water the regular one usually sinks and the diet one floats. The sugar dissolved in the regular drink raises its density above that of water. - [Diaper crystals: how much water do they hold, and what does salt do?](https://engineergurukul.com/resources/project-ideas/diaper-polymer-absorbs-water-not-salt-water/): The white powder inside a baby diaper is a polymer that soaks up many times its mass of fresh water and turns to gel. It absorbs far less from salty water, which shows how dissolved salt changes the way it works. - [Cornflour and water oobleck: a mixture that acts both solid and liquid](https://engineergurukul.com/resources/project-ideas/cornflour-oobleck-solid-and-liquid-behaviour/): A thick mix of cornflour and water flows slowly when poured but turns hard when it is hit or squeezed. It is a suspension whose behaviour depends on how fast you push it. ### Biology, Class 6 to 8 - [What do seeds need to sprout?](https://engineergurukul.com/resources/project-ideas/seed-germination/): Seeds need water, air and warmth to germinate. Most seeds sprout even in the dark, but the seedlings need light to turn green and keep growing. - [Human digestive system model](https://engineergurukul.com/resources/project-ideas/digestive-system/): Food travels from the mouth down the food pipe to the stomach, the small intestine and the large intestine. The liver and pancreas add juices that help digestion. - [Working lungs model](https://engineergurukul.com/resources/project-ideas/lungs-model/): Pulling the diaphragm (the stretched balloon) down makes more space in the chest, the air pressure inside drops, and air rushes into the lungs. Pushing it back up pushes the air out. - [Human heart model with double circulation](https://engineergurukul.com/resources/project-ideas/human-heart-model/): The heart has four chambers. The right side pumps blood to the lungs to pick up oxygen, and the left side pumps it to the rest of the body. Valves stop the blood flowing backwards. - [Plant and animal cell models](https://engineergurukul.com/resources/project-ideas/plant-and-animal-cells/): Both cells have a nucleus, cytoplasm and a cell membrane. Plant cells also have a cell wall, chloroplasts and a large vacuole. - [Turn a sprouting seed sideways: do roots still grow down?](https://engineergurukul.com/resources/project-ideas/roots-grow-down-turned-seedling-test/): When a sprouting seed is turned on its side, the root bends to keep growing downwards and the shoot bends upwards. Plants sense gravity, and the response is called gravitropism (or geotropism). - [Shoebox maze: a bean shoot finds its way to the light](https://engineergurukul.com/resources/project-ideas/shoebox-maze-shoot-finds-the-light/): A bean shoot growing inside a dark shoebox with one small hole turns and twists around cardboard walls until it reaches the light. Plants grow towards light, a response called phototropism. - [Plastic bag over a leafy twig: collect the water leaves give off](https://engineergurukul.com/resources/project-ideas/bag-over-leafy-twig-transpiration-water/): A clear bag tied over a leafy branch fills with droplets within a few hours, while a bag over a bare branch stays dry. Leaves lose water vapour through tiny pores (stomata), a process called transpiration. - [Foil on a leaf: where does the plant store starch?](https://engineergurukul.com/resources/project-ideas/foil-covered-leaf-starch-iodine-test/): A leaf partly covered with foil for two days and then tested with iodine turns blue-black only where light reached it. Leaves make starch by photosynthesis, and photosynthesis needs light. - [Human skeleton from cardboard tubes, straws and bottle caps](https://engineergurukul.com/resources/project-ideas/cardboard-tube-skeleton-from-waste/): A life-size or half-size skeleton built from waste shows the main bones of the body, how the skull protects the brain, how the ribs make a cage around the heart and lungs, and where the joints let us bend. - [Cardboard arm with rubber-band biceps and triceps](https://engineergurukul.com/resources/project-ideas/rubber-band-biceps-triceps-arm-model/): Two rubber bands or balloons with pull threads on a hinged cardboard arm show that muscles work in pairs: when the biceps is pulled short the arm bends, and when the triceps is pulled short the arm straightens. Muscles c - [Bread mould in sealed bags: damp, dry, warm and cold](https://engineergurukul.com/resources/project-ideas/bread-mould-sealed-bags-damp-vs-dry/): Slices of bread sealed in bags under different conditions show that mould grows fastest on damp bread in a warm place and hardly at all on dry bread or in the fridge. Mould is a fungus that grows from spores already pres - [Eggshells in cola, juice, milk and water: a tooth decay model](https://engineergurukul.com/resources/project-ideas/eggshell-in-cola-juice-tooth-decay-model/): Eggshells soaked in cola and fruit juice soften, stain and lose material within days, while shells in milk and water stay hard. Eggshell, like tooth enamel, is a hard mineral that acids slowly dissolve, so sugary and aci - [Balcony bird diary: a 2 week tally of the birds around you](https://engineergurukul.com/resources/project-ideas/balcony-bird-diary-tally-chart/): Watching the same spot for 15 minutes each morning and evening and tallying every bird seen shows which species live nearby, when each is active and what it eats. The diary becomes a small record of local biodiversity. - [Ant trails: which foods do ants choose and how do they find them?](https://engineergurukul.com/resources/project-ideas/ant-trail-food-choice-observation/): Tiny drops of sugar water, salt water, oil and plain water set out near an ant trail show which foods ants prefer and how a few scouts quickly bring many workers along a chemical trail. Wiping a damp tissue across the tr - [Who lives in a handful of garden soil? A white tray survey](https://engineergurukul.com/resources/project-ideas/soil-creatures-count-white-tray/): Spreading soil from a garden bed, a compost heap and bare ground on white trays and counting the earthworms, beetles, millipedes, ants and springtails shows that living soil is full of animals and that richer soil has mo - [Celery stalk in coloured water: how water climbs a stem](https://engineergurukul.com/resources/project-ideas/celery-stalk-coloured-water-climb/): Plants pull water up through thin tubes in their stems. When the water is coloured, the colour travels up inside the stalk and shows exactly where the tubes run, all the way to the leaves. - [White flower with a split stem that drinks two colours](https://engineergurukul.com/resources/project-ideas/white-flower-split-stem-two-colours/): A single white flower can turn two colours when its stem is split and each half drinks a different dye. It shows that water travels in separate channels all the way up to the petals. - [Three bean pots: too little, enough and too much water](https://engineergurukul.com/resources/project-ideas/three-bean-pots-too-little-enough-too-much-water/): A plant needs the right amount of water, not the most. Roots in soggy soil lack air and plants in dry soil lack water, so only the middle pot grows well. - [Crowded or spaced: do seedlings compete for light and space?](https://engineergurukul.com/resources/project-ideas/crowded-or-spaced-seedlings-competition-test/): Plants growing close together share the same light, water and soil, so each one has less. Comparing a crowded tray with a spaced tray shows how competition changes growth. - [Tall cup and short cup: does root room change growth?](https://engineergurukul.com/resources/project-ideas/tall-and-short-cups-root-room-for-bean-plants/): The depth and amount of soil limit how far roots can spread. Growing the same bean in a tall cup and a short cup shows how room for roots affects the plant above ground. - [Ear model with a funnel and balloon eardrum and dancing salt](https://engineergurukul.com/resources/project-ideas/ear-model-funnel-balloon-eardrum-dancing-salt/): Sound is collected by the outer ear and makes the eardrum vibrate. A balloon stretched over a tube acts as the eardrum, and grains of salt dance on it when you speak into the funnel. - [Shoebox eye model with a lens that shows an upside-down image](https://engineergurukul.com/resources/project-ideas/shoebox-eye-model-lens-upside-down-image/): The eye works like a camera. A lens at the front focuses light from the world onto a screen at the back, giving a small image that is upside down. - [Blind spot card: finding the place where your eye cannot see](https://engineergurukul.com/resources/project-ideas/blind-spot-card-test-find-your-gap/): Each eye has a small spot with no light-sensing cells, where the optic nerve leaves the eye. A card with a cross and a dot lets you find the distance at which the dot disappears. - [Is there a tongue map? Testing sweet, salt, sour and bitter](https://engineergurukul.com/resources/project-ideas/tongue-taste-zones-myth-test-with-cotton-buds/): The old school picture of a tongue with separate zones for each taste is a myth. Testing tastes on different parts of the tongue shows that every part can detect all the basic tastes. - [Two-point touch test on fingertip, palm and forearm](https://engineergurukul.com/resources/project-ideas/two-point-touch-test-fingertip-palm-forearm/): Our skin is not equally sensitive everywhere. The smallest gap at which a person feels two points instead of one shows where touch receptors are packed more closely. - [Ruler-drop reaction time: does practice or distraction change it?](https://engineergurukul.com/resources/project-ideas/ruler-drop-reaction-time-practice-and-distraction/): A dropped ruler measures how fast your nerves and muscles respond. How far the ruler falls before you catch it gives your reaction time, and you can test how practice or a second task changes it. - [Pulse rate before and after exercise: a recovery graph](https://engineergurukul.com/resources/project-ideas/pulse-rate-exercise-and-recovery-graph/): Muscles in exercise need more oxygen and glucose, so the heart beats faster. The time that the pulse takes to come back to normal shows how quickly the body recovers. - [Funnel and tube stethoscope to hear the heartbeat](https://engineergurukul.com/resources/project-ideas/funnel-and-tube-stethoscope-hear-your-heartbeat/): A funnel and a rubber tube can carry the sounds of the heart to your ear. You hear a steady lub-dub that is made as the heart valves close. - [Blood in a bottle: plasma, red cells, white cells and platelets](https://engineergurukul.com/resources/project-ideas/blood-in-a-bottle-plasma-cells-platelets-model/): Blood is made of a pale yellow liquid, plasma, with red cells, white cells and platelets floating in it. A sealed bottle with beads shows the parts and their rough amounts. - [Four body joints from waste: ball, hinge, pivot and gliding](https://engineergurukul.com/resources/project-ideas/four-body-joints-from-waste-ball-hinge-pivot-gliding/): Where two bones meet, a joint lets them move in a particular way. Models made from waste show how a ball and socket, a hinge, a pivot and a gliding joint each allow a different movement. - [Tea-stained eggshell: water, brush or toothpaste, which cleans best?](https://engineergurukul.com/resources/project-ideas/tea-stained-eggshell-brushing-with-and-without-toothpaste/): Foods and drinks can stain the surface of teeth, and brushing removes the stain. Stained eggshells stand in for teeth to compare rinsing, brushing with water and brushing with toothpaste. - [Fat spot test on brown paper: nuts, snacks, fruit and sweets](https://engineergurukul.com/resources/project-ideas/fat-spot-test-brown-paper-nuts-snacks-fruit/): Foods that contain fat leave a see-through greasy mark on brown paper that does not dry away. A quick rub test sorts foods into those with fat and those without. - [Banana ripening in bags: does a ripe fruit speed it up?](https://engineergurukul.com/resources/project-ideas/banana-ripening-bag-with-ripe-fruit-ethylene/): Ripening fruits release a gas called ethylene that makes nearby fruit ripen faster. Green bananas sealed with a ripe fruit ripen sooner than bananas left on their own. - [Idli batter rise diary: a warm corner against a cool corner](https://engineergurukul.com/resources/project-ideas/idli-dosa-batter-rise-diary-warm-and-cool/): Rice and urad dal batter swells and turns sour overnight because tiny microbes in it make gas and acid. The rise is faster in a warm place than in a cool one. - [Curd setting time at three temperatures](https://engineergurukul.com/resources/project-ideas/curd-setting-time-at-three-temperatures/): Milk turns into curd because friendly bacteria in a spoon of old curd turn milk sugar into lactic acid. Keeping the milk at different temperatures shows how heat changes the speed of this change. - [Paddy field food web as a hanging mobile with who-eats-whom threads](https://engineergurukul.com/resources/project-ideas/paddy-field-food-web-hanging-mobile/): In a paddy field many food chains join into a web. A hanging mobile with threads showing who eats whom makes it easy to see how energy passes from rice plants to the top animals. - [Closed bottle garden that recycles its own water](https://engineergurukul.com/resources/project-ideas/closed-bottle-garden-water-cycle-and-gas-balance/): A sealed jar with soil and plants keeps its own small water cycle. Water evaporates from the soil and leaves, condenses on the glass and runs back, while plants and soil life swap oxygen and carbon dioxide. - [Flower visitor watch: counting pollinator visits by colour and time of day](https://engineergurukul.com/resources/project-ideas/flower-visitor-watch-pollinator-count-by-colour-and-time/): Many flowers depend on insects, birds or bats to move pollen so they can make fruit. Counting visitors on two kinds of flower at different times of day shows which flowers and hours are busiest. - [Bamboo, pine cone and brick insect hotel for garden helpers](https://engineergurukul.com/resources/project-ideas/bamboo-and-brick-insect-hotel-for-solitary-bees/): Many helpful insects, such as solitary bees, need small holes to nest or shelter. A hotel made from waste gives them a safe place and lets you observe from a distance who moves in. - [Seed travel models: wind wing, fluff parachute, floating husk, hook and spring](https://engineergurukul.com/resources/project-ideas/seed-travel-models-wind-water-hook-and-spring/): Plants spread their seeds far from the parent so the young plants have room to grow. Paper and cloth models copy how wind, water, animals and bursting pods carry seeds. - [Onion peel slide: cell wall, nucleus and the size of one cell](https://engineergurukul.com/resources/project-ideas/onion-peel-slide-cell-wall-nucleus-and-size/): The thin skin of an onion layer is a sheet of box-like plant cells. A stained slide under the microscope shows the cell wall and the nucleus, and a simple trick lets you estimate how big each cell is. - [Plant cell model in a foil tray with clay organelles](https://engineergurukul.com/resources/project-ideas/plant-cell-model-foil-tray-clay-thermocol/): A plant cell has a rigid cell wall, a cell membrane, a nucleus, a large vacuole and green chloroplasts. The model shows where each part sits and what job it does. - [Bottle, balloon and straw model of the lungs and diaphragm](https://engineergurukul.com/resources/project-ideas/balloon-bottle-diaphragm-lung-model/): Breathing happens because the diaphragm moves down and the chest space grows, which lowers the pressure inside so air rushes in. Pushing the diaphragm up squeezes the lungs and air leaves. - [Digestive system model with a stocking and a zip-bag stomach](https://engineergurukul.com/resources/project-ideas/cardboard-digestive-tract-stocking-model/): Food travels through one long tube, the alimentary canal, and is broken down by chewing and stomach juices, then absorbed in the small intestine. The model shows the order and lengths of the parts. - [Self-watering bottle planter that waters itself with a cotton wick](https://engineergurukul.com/resources/project-ideas/wick-fed-self-watering-bottle-planter/): Water climbs up a cotton wick by capillary action, which moves it from the lower tank to the soil without any pump. Plants take what they need and the tank lasts several days. - [Paper plate food chain and food web spinner](https://engineergurukul.com/resources/project-ideas/paper-plate-food-chain-spinner/): Energy passes from the Sun to plants and then to animals that eat them. The spinner shows who eats whom and why the chain starts with a producer. - [Cardboard flower with removable parts that shows pollination](https://engineergurukul.com/resources/project-ideas/cardboard-flower-model-removable-parts-pollination/): A flower has sepals, petals, stamens and a pistil. Pollen travels from the stamen to the stigma, which starts the making of seeds. - [Which bag ripens bananas faster? Ethylene gas at home](https://engineergurukul.com/resources/project-ideas/banana-ripening-paper-bag-ethylene/): Ripe fruits release a gas called ethylene that makes other fruits ripen faster. By keeping green bananas in different bags and with a ripe fruit, you see how trapping this gas speeds up ripening. - [How much water do chana and rajma soak up in a night?](https://engineergurukul.com/resources/project-ideas/dal-soaking-weight-gain-over-hours/): Dry seeds take up water through their seed coat by imbibition, swelling and gaining weight. By weighing dry and soaked pulses at fixed times you plot how fast and how much they absorb, and why soaking helps cooking and s - [Hydroponic mint and spinach grown in a cut bottle with no soil](https://engineergurukul.com/resources/project-ideas/hydroponic-mint-and-spinach-in-a-cut-bottle/): Plants can grow with their roots in nutrient water instead of soil. A bottle hydroponic setup shows that roots need water, nutrients and air, not soil itself. - [Cotton wick self-watering planter: how long can a plant go unwatered?](https://engineergurukul.com/resources/project-ideas/cotton-wick-self-watering-planter-test/): A wick moves water from a reservoir into the soil by capillary action. A plant in a wick pot stays healthy while a normal pot dries out, which shows how to save water and look after plants during holidays. - [Compost, vermicompost and plain soil: which grows beans best?](https://engineergurukul.com/resources/project-ideas/compost-vermicompost-and-plain-soil-bean-growth/): Organic manures add nutrients and improve the soil. Growing the same bean in plain soil, compost and vermicompost shows the effect of each on growth. - [Ant repellents compared: turmeric, chalk, clove powder and vinegar line](https://engineergurukul.com/resources/project-ideas/ant-trail-repellents-turmeric-chalk-clove-and-vinegar/): Ants follow chemical trails and avoid some household substances. Counting how many ants cross a line of each substance gives a safe test of natural repellents. - [Class seed bank of local varieties with germination record cards](https://engineergurukul.com/resources/project-ideas/community-seed-bank-with-germination-record-cards/): Saving seeds of local vegetables, pulses and flowers keeps variety alive. A record card for each seed packet teaches how farmers collect, dry, label, store and test seeds. - [Thali balance survey: what food groups does a class eat at lunch?](https://engineergurukul.com/resources/project-ideas/thali-balance-class-lunch-survey/): A balanced meal has foods from several groups: cereals, pulses, vegetables, fruit, and milk products. A survey of lunch boxes shows which groups most students eat and which they miss. - [Pulse rate and recovery time after skipping, plotted on a graph](https://engineergurukul.com/resources/project-ideas/pulse-recovery-after-skipping-graph/): The heart beats faster during exercise to supply more oxygen to muscles. After stopping, the pulse falls back to its resting rate, and the time it takes is a simple sign of how the body recovers. - [Breaths per minute at rest, after stairs and after a short run](https://engineergurukul.com/resources/project-ideas/breathing-rate-rest-stairs-run/): Breathing rate increases with activity because the body needs to take in more oxygen and release more carbon dioxide. Counting breaths gives a simple measure of this change. - [School bag weight and standing posture: a photo and tape-measure survey](https://engineergurukul.com/resources/project-ideas/school-bag-weight-posture-photo-survey/): Heavy bags can change the way a student stands, with the head and shoulders leaning forward. Measuring bag weight as a share of body weight and checking posture in side photos gives data to discuss a safe bag load. - [Does washing longer remove more? A 5, 10 and 20 second hand-wash test](https://engineergurukul.com/resources/project-ideas/handwash-duration-dust-removal-test/): Soap helps to lift dirt and oily grime off the skin, and rubbing for longer removes more of it. A harmless coloured powder stands in for germs so that you can see how much is removed in a given time. - [Hidden sugar in cold drinks shown as spoonfuls on the table](https://engineergurukul.com/resources/project-ideas/cold-drink-hidden-sugar-spoon-model/): Many drinks carry a lot of sugar. By converting the grams on the label into teaspoons of sugar, you can see in a vivid way how much sugar is in a glass. - [Reading food labels: comparing three biscuits per 100 g](https://engineergurukul.com/resources/project-ideas/biscuit-label-reading-per-100g/): Packaged foods list energy, fat, sugar, protein and salt on the label. Comparing foods fairly means using the per 100 g column and not the per pack figure, which depends on pack size. - [Class water diary: how much do students drink on a hot school day?](https://engineergurukul.com/resources/project-ideas/class-water-diary-hot-school-day/): Water is lost through sweat, breath and urine, and has to be replaced by drinking and by the water in food. A diary of how much students drink shows the range between individuals and how heat affects it. - [Eggshell tooth test: which drinks stain and soften it overnight?](https://engineergurukul.com/resources/project-ideas/eggshell-tooth-drink-stain-and-soften/): An eggshell is made of calcium carbonate like tooth enamel is mostly calcium minerals. Soaking shells in different drinks shows which ones stain and which ones soften the shell, a model for why teeth need care. - [Pupil size in bright and dim light, measured with a mirror and ruler](https://engineergurukul.com/resources/project-ideas/pupil-size-bright-and-dim-light-mirror/): The pupil gets smaller in bright light and larger in dim light, an automatic reflex that protects the eye and helps it see. A mirror and a ruler let you measure this change without any special equipment. - [Paper-cup stethoscope for listening to a heartbeat and counting it](https://engineergurukul.com/resources/project-ideas/paper-cup-stethoscope-heartbeat-listening/): Sound from the heart is passed through the chest and can be gathered by a cup, which makes it louder in your ear. Counting the beats gives the heart rate. - [One-leg balance time with eyes open, eyes closed and a moving floor](https://engineergurukul.com/resources/project-ideas/one-leg-balance-eyes-open-closed-timing/): Balance uses signals from the eyes, the inner ear, and the muscles and joints. Taking away the vision signal makes balancing much harder, which shows how the senses work together. - [Sprouting moong and chana: a five-day length and weight log](https://engineergurukul.com/resources/project-ideas/sprouts-moong-chana-growth-weight-log/): Soaked seeds wake up, absorb water and start to grow roots and shoots. Measuring weight and sprout length every day shows how quickly the seed changes, and why sprouts are a popular food. - [Nature walk collection tray with labels](https://engineergurukul.com/resources/project-ideas/nature-walk-collection-tray-with-labels/): Plants and their parts come in many sizes, shapes and colours. Collecting and sorting fallen things makes us look closely and notice differences. - [Does a plant lean towards the window light?](https://engineergurukul.com/resources/project-ideas/plant-leans-towards-the-window-light-test/): Plants grow towards light. A seedling kept by a window bends towards it, and turns back if we turn the pot around. - [Heartbeat count: resting and after 20 jumps](https://engineergurukul.com/resources/project-ideas/heartbeat-count-before-and-after-jumping/): The heart beats faster when the body works harder. We can feel the pulse and count it to see the change. - [How big is my breath? Blowing up a balloon](https://engineergurukul.com/resources/project-ideas/balloon-breath-how-big-is-my-breath/): Our lungs hold air. We can compare how much air different people can blow out in one breath by measuring a balloon. - [Fingerprint cards: loops, whorls and arches](https://engineergurukul.com/resources/project-ideas/fingerprint-cards-loops-whorls-and-arches/): Every person has a different pattern of ridges on their fingertips. The patterns fall into a few main types: loops, whorls and arches. - [Regrowing carrot and beetroot tops in a shallow dish](https://engineergurukul.com/resources/project-ideas/regrowing-carrot-and-beetroot-tops-in-a-dish/): Plants store food in roots like carrot and beetroot. If the top is kept in water, it uses that stored food to sprout new leaves. - [Matchstick pulse indicator: heart rate before and after exercise](https://engineergurukul.com/resources/project-ideas/matchstick-pulse-indicator-exercise/): Each heartbeat pushes a wave of blood through the arteries, and at the wrist this wave makes a tiny matchstick rock. Counting the rocks for a minute gives the pulse rate, which rises after exercise because the muscles ne - [Funnel and rubber-tube stethoscope that lets you hear a heartbeat](https://engineergurukul.com/resources/project-ideas/funnel-and-tube-stethoscope/): A funnel gathers the faint sound of the heart and the tube guides it to the ear, so a heartbeat sounds louder than it does through the air. You hear two sounds, lub and dub, made by the heart valves closing. - [Ruler-drop reaction time: how fast does a signal travel from eye to hand?](https://engineergurukul.com/resources/project-ideas/ruler-drop-reaction-time-nerves/): Catching a falling ruler needs the eye, brain, nerves and muscle to work together, and the distance it falls before you catch it gives your reaction time. Using the free fall formula the distance is converted to a time o - [Blind spot card: finding the place in your eye that cannot see](https://engineergurukul.com/resources/project-ideas/blind-spot-card-for-the-eye/): Where the optic nerve leaves the retina there are no light-sensing cells, so a small spot in each eye cannot see. A cross and a dot on a card show the dot vanishing when its image falls on this blind spot. - [Card microscope with a water-drop lens to see onion peel cells](https://engineergurukul.com/resources/project-ideas/water-drop-lens-onion-cell-microscope/): A tiny drop of water held in a hole acts like a strong magnifying lens, and with it the brick-like cells of an onion peel can be seen. It shows that all living things are made of cells. - [Touch-me-not (Mimosa) plant: timing how long leaves take to close and reopen](https://engineergurukul.com/resources/project-ideas/touch-me-not-leaf-response-timing/): The leaves of the touch-me-not plant fold up within seconds of being touched and open again after a few minutes. This shows that plants also respond to stimuli, but through changes in water pressure in cells rather than - [Hydrotropism tray: do pea roots grow towards damp cotton?](https://engineergurukul.com/resources/project-ideas/roots-turn-towards-water-hydrotropism-tray/): Plant roots can bend towards moisture, a response called hydrotropism, even when gravity pulls them straight down. A tray with a damp side and a dry side shows roots growing toward the water. ### Maths, Class 6 to 8 - [Fraction wall](https://engineergurukul.com/resources/project-ideas/fraction-wall/): Strips cut into halves, thirds, quarters and smaller parts show which fractions are equal (2/4 is the same as 1/2) and which fraction is bigger. - [Pythagoras theorem model](https://engineergurukul.com/resources/project-ideas/pythagoras-theorem/): In a right-angled triangle, the square on the longest side has the same area as the squares on the other two sides together (a² + b² = c²). Cut the two smaller squares into pieces and they fit exactly into the big one. - [The angles of a triangle add up to 180°](https://engineergurukul.com/resources/project-ideas/triangle-angle-sum/): Tear off the three corners of any paper triangle and place them side by side: they always make a straight line, which is 180 degrees. - [Area of a circle by cutting sectors](https://engineergurukul.com/resources/project-ideas/area-of-a-circle/): Cut a circle into many equal sectors and arrange them top to tail: they form a shape close to a rectangle with sides πr and r, so the area is πr². - [Fraction pizza circles with a spinner that matches equal parts](https://engineergurukul.com/resources/project-ideas/fraction-pizza-spinner-board/): Circles cut into 2, 3, 4, 6, 8 and 12 equal slices show that 1/2 is the same amount as 2/4, 3/6, 4/8 and 6/12, and that two slices of 1/3 plus one of 1/6 make 5/6, which is less than one whole pizza. - [Sliding decimal point board for tenths and hundredths](https://engineergurukul.com/resources/project-ideas/sliding-decimal-point-board/): The digits of a number stay in order while the decimal point slides. Moving the point one place to the right multiplies by 10 (3.45 becomes 34.5) and one place to the left divides by 10 (3.45 becomes 0.345). - [Lattice multiplication machine with sliding digit strips](https://engineergurukul.com/resources/project-ideas/lattice-multiplication-slider/): Lattice multiplication breaks a product like 23 times 47 into four small products (8, 12, 14 and 21) written in split boxes, then adds along the diagonals to give 1,081. The machine makes the method quick enough to race - [Napier's bones multiplication rods made from ice-cream sticks](https://engineergurukul.com/resources/project-ideas/napier-bones-ice-cream-sticks/): Each rod carries the multiplication table of one digit written in split boxes. Laying rods for 4 and 6 side by side and reading row 7 gives 7 times 46 = 322 by adding along the slanted lines, a 400-year-old calculating t - [Times-table string art on a ten-point circle](https://engineergurukul.com/resources/project-ideas/times-table-string-art-circle/): Join the last digits of a multiplication table in order on a circle marked 0 to 9: the two times table draws a pentagon, the three times table a ten-pointed star, the five times table a single line, and the nine times ta - [Paper plate angle maker with a sliding arm and degree scale](https://engineergurukul.com/resources/project-ideas/paper-plate-angle-maker/): Two plates joined at the centre open like a fan to show any angle from 0 to 360 degrees. The scale shows that a right angle is 90 degrees, a straight angle 180 degrees and a full turn 360 degrees, and the arm names each - [Nail and rubber-band geoboard for shapes, perimeter and area](https://engineergurukul.com/resources/project-ideas/nail-geoboard-shapes-and-area/): Rubber bands stretched round nails on a square grid make triangles, rectangles and other polygons in seconds. Counting the unit squares inside a shape gives its area, and a rectangle 3 by 4 always has area 12 and perimet - [Tangram set with a fraction and area table for each piece](https://engineergurukul.com/resources/project-ideas/tangram-fraction-area-set/): The seven tangram pieces are cut from one square. The two large triangles are each one quarter of the square, the medium triangle, the square and the parallelogram are each one eighth, and the two small triangles are eac - [Five Platonic solids folded from cardboard nets](https://engineergurukul.com/resources/project-ideas/five-platonic-solids-cardboard-nets/): Only five solids can be made with every face the same regular polygon and the same number of faces at every corner: the tetrahedron (4 triangles), cube (6 squares), octahedron (8 triangles), dodecahedron (12 pentagons) a - [Tessellating animal tile made by the cut-and-slide method](https://engineergurukul.com/resources/project-ideas/cut-and-slide-tessellation-tile/): A piece cut from one side of a square and slid to the opposite side still tiles the plane with no gaps, because the square itself tiles. Repeating the trick on the other pair of sides gives a tile shaped like a fish or a - [Hinged mirror pair that shows symmetry and how many images appear](https://engineergurukul.com/resources/project-ideas/hinged-mirror-symmetry-box/): A single mirror stood on a shape shows its line of symmetry: half a butterfly becomes a whole one. Two mirrors hinged together show more and more copies as the angle closes: at 90 degrees you see 4 copies in all, at 60 d - [Cut-and-slide board that turns a parallelogram into a rectangle](https://engineergurukul.com/resources/project-ideas/parallelogram-to-rectangle-slide-board/): A triangle cut from one end of a parallelogram and slid to the other end makes a rectangle of the same base and height, so the area of a parallelogram is base times height. Cutting the parallelogram along a diagonal give - [Unfolding cube that shows surface area is six squares](https://engineergurukul.com/resources/project-ideas/unfolding-cube-surface-area-box/): A cube of side 5 cm hinged along its edges opens flat into a net of six 5 cm squares, so its surface area is 6 times 25 = 150 square cm. A second box, 5 by 4 by 3 cm, opens to show three pairs of rectangles with total ar - [Knotted 3-4-5 rope for making right angles like builders](https://engineergurukul.com/resources/project-ideas/knotted-rope-3-4-5-right-angle/): A rope with 13 knots at equal spacing is pulled into a triangle with sides of 3, 4 and 5 spaces. The angle between the 3 and 4 sides is exactly a right angle, because 3 squared plus 4 squared equals 5 squared, a rope met - [Measure a tree's height from shadows and similar triangles](https://engineergurukul.com/resources/project-ideas/tree-height-from-shadows-similar-triangles/): At the same moment the Sun makes the shadow of a tree and the shadow of a metre stick in the same proportion. If a 1 metre stick casts a 1.5 metre shadow and the tree casts a 9 metre shadow, the tree is 9 divided by 1.5, - [Fair and unfair spinners: predicted versus observed outcomes](https://engineergurukul.com/resources/project-ideas/fair-and-unfair-spinner-experiment/): A spinner with four equal sectors lands on each colour about a quarter of the time. A spinner with sectors of 180, 90, 45 and 45 degrees lands on the big colour about half the time and on each small colour about one eigh - [Bottle-cap pie chart built from a class survey of favourite games](https://engineergurukul.com/resources/project-ideas/bottle-cap-pie-chart-class-survey/): A survey of 30 classmates is shown as coloured bottle caps on a circle. If 12 chose cricket, cricket gets 12 out of 30 of the circle, which is 144 degrees, and the slices of the pie add up to the full 360 degrees of the - [Balance beam that finds the mean of a data set](https://engineergurukul.com/resources/project-ideas/balance-beam-that-finds-the-mean/): Equal weights hung from a numbered beam at the data values balance only when the support is at the mean. Weights at 2, 3 and 7 balance at 4, their mean, and moving one weight from 7 to 13 shifts the balance point to 6, s - [Pascal's triangle cup pyramid with hidden number patterns](https://engineergurukul.com/resources/project-ideas/pascal-triangle-cup-pyramid/): Paper cups stacked in a triangle carry Pascal's numbers: each cup holds the sum of the two cups above it. Row sums double each time (1, 2, 4, 8, 16, 32), the second diagonal counts 1, 2, 3, 4, and the third diagonal hold - [Measure pi by rolling lids of five different sizes](https://engineergurukul.com/resources/project-ideas/pi-from-rolling-lids/): Rolling a round lid exactly one turn along a ruler marks out its circumference. For every lid, from a bottle cap to a steel plate, dividing the distance rolled by the diameter gives the same number, about 3.14, which is - [Clothes-hanger balance that solves x + 3 = 7 with marbles](https://engineergurukul.com/resources/project-ideas/hanger-balance-solves-equations/): A hanger with a cup on each side stays level only when both sides weigh the same. A sealed bag of marbles stands for x; with 3 loose marbles beside it balancing 7 on the other side, removing 3 from each side keeps the ba - [Coordinate battleship game played on all four quadrants](https://engineergurukul.com/resources/project-ideas/four-quadrant-coordinate-battleship/): Players hide paper ships on a grid running from minus 8 to 8 on both axes and call shots as ordered pairs like (minus 3, 5). Reading x before y and keeping the signs straight is the only way to win, so the game drills pl - [Magic square boards: the 3 by 3 Lo Shu and the 4 by 4 of Durer](https://engineergurukul.com/resources/project-ideas/lo-shu-and-durer-magic-square-boards/): In a magic square every row, column and both diagonals add to the same total. The 3 by 3 square using 1 to 9 always totals 15 and has 5 in the centre; the 4 by 4 square 16, 3, 2, 13 / 5, 10, 11, 8 / 9, 6, 7, 12 / 4, 15, - [Matchstick Nim game board with its unbeatable strategy](https://engineergurukul.com/resources/project-ideas/matchstick-nim-winning-strategy/): Two players take 1, 2 or 3 sticks in turn from a pile of 21 and the player who takes the last stick wins. Whoever leaves a multiple of 4 after their move (20, 16, 12, 8, 4) can always win, so the first player wins a game - [Tower of Hanoi from bottle caps with the 2 to the n minus 1 rule](https://engineergurukul.com/resources/project-ideas/bottle-cap-tower-of-hanoi/): Discs of different sizes must be moved from one peg to another, one at a time, never putting a larger disc on a smaller one. The least number of moves is 1, 3, 7, 15, 31 and 63 for 1 to 6 discs, which is 2 to the power n - [Geared clock hands model that measures the angle between hands](https://engineergurukul.com/resources/project-ideas/clock-hands-angle-model/): The minute hand turns 6 degrees per minute and the hour hand half a degree per minute, so the angle between them at any time is the difference of 30 times the hours and 5.5 times the minutes. At 3:00 the angle is 90 degr - [Vedic maths flip board for squaring numbers ending in 5](https://engineergurukul.com/resources/project-ideas/vedic-squares-ending-in-five-flip-board/): To square a number ending in 5, multiply the tens digit by the next number up and write 25 after it: 35 squared is 3 times 4 = 12 followed by 25, so 1,225. The flip board shows each step and the algebra behind it: (10a + - [Nikhilam slider that multiplies numbers near 100 in one line](https://engineergurukul.com/resources/project-ideas/nikhilam-base-100-slider/): To multiply 97 by 96, write how far each is below 100 (3 and 4). Subtract crosswise, 97 minus 4 = 93, and multiply the deficits, 3 times 4 = 12, to get 9,312. The slider lines up the two numbers and their deficits so the - [Matchbox drawer organiser that explains volume and surface area](https://engineergurukul.com/resources/project-ideas/matchbox-drawers-volume-and-surface-area/): Stacking identical boxes shows that volume is repeated cubic units, while joining them hides some faces and reduces the total surface area. It is also a useful desk organiser. - [Tin-can pen stand that shows the best packing of circles](https://engineergurukul.com/resources/project-ideas/tin-can-pen-stand-hexagon-packing/): Circles packed in a hexagon pattern leave less gap than circles in a square grid. The pen stand shows the hexagonal packing, and drawings on graph paper let you compare the two packings by measuring the wasted space. - [Ice-cream stick fraction wall for halves, quarters and eighths](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-fraction-wall/): Equal parts of the same whole can be compared by length. The wall shows that one half equals two quarters and four eighths. - [How much does rice swell? Water ratio and volume maths](https://engineergurukul.com/resources/project-ideas/rice-and-water-ratio-swelling/): Rice soaks up water and swells, and the amount of cooked rice depends on the ratio of rice to water. By measuring in cups you practise ratio and volume and see how much bigger the rice becomes. - [Which paper towel or tissue soaks up the most? A fair test with maths](https://engineergurukul.com/resources/project-ideas/paper-towel-absorbency-comparison/): You compare tissue papers or paper towels for absorbency and cost by measuring grams of water held per sheet and per rupee. It is a practice in fair testing, averaging and unit costs. - [Best buy at the kirana shop: unit price of five everyday items](https://engineergurukul.com/resources/project-ideas/best-buy-unit-price-kirana-shop/): The cheapest looking pack is not always the best buy. Dividing the price by the weight or volume gives the unit price, which lets you compare packs of different sizes fairly. - [The discount puzzle: 20 percent off then 10 percent off](https://engineergurukul.com/resources/project-ideas/discount-puzzle-twenty-then-ten-percent/): Two successive discounts do not add up to one big discount. A 20 percent off followed by 10 percent off is worth 28 percent, not 30. You test this with real prices from a sale and learn to calculate discounts correctly. - [Scaling a recipe: ratios, fractions and measuring cups](https://engineergurukul.com/resources/project-ideas/scaling-a-recipe-ratio-and-measuring-cups/): A recipe is a set of ratios, so halving or doubling it means multiplying every amount by the same number. You rewrite a simple recipe for 2, 8 and 12 people and practise fractions and unit conversion. - [How many tiles for the floor? Area, wastage and cost by newspaper model](https://engineergurukul.com/resources/project-ideas/tiles-and-floor-area-estimate-with-newspaper/): The number of tiles needed depends on the area of the room divided by the area of a tile, plus some extra for cutting. You model a room with newspaper sheets as tiles and then work out the count and cost for a real room. - [Dot rangoli: patterns with lines and symmetry on dots](https://engineergurukul.com/resources/project-ideas/dot-rangoli-patterns-on-squared-paper/): Joining dots makes patterns that have symmetry. Both halves of the drawing look the same, like a rangoli. - [Paper tiles that fit together: which shapes leave no gaps?](https://engineergurukul.com/resources/project-ideas/paper-tiles-that-fit-together-without-gaps/): Some shapes, like squares, triangles and hexagons, can cover a floor without gaps. Others, like circles, leave gaps. This is why floors are tiled with certain shapes. - [Paper money class shop: buy, sell and give change](https://engineergurukul.com/resources/project-ideas/paper-money-class-shop-role-play/): Money is used to buy things, and shopkeepers give back change. Playing shop teaches adding prices, counting notes and finding change. - [Weekly pocket money chart: save, spend and share](https://engineergurukul.com/resources/project-ideas/weekly-pocket-money-tally-chart/): Money can be saved, spent or shared. Writing it in a chart shows where it goes and helps children plan. - [Two paper triangles that fit together to prove area is half base times height](https://engineergurukul.com/resources/project-ideas/two-paper-triangles-make-a-parallelogram/): Any triangle, copied and turned upside down, joins its twin to make a parallelogram with the same base and height. So the triangle has exactly half the area, which is why area = 1/2 times base times height. - [Trapezium area from two copies that form a parallelogram](https://engineergurukul.com/resources/project-ideas/trapezium-area-two-copies-parallelogram/): Two identical trapeziums, one turned upside down, fit together into a parallelogram whose base is the sum of the two parallel sides. This shows that the area of a trapezium is half of the sum of the parallel sides times - [Walk a polygon on the ground: exterior angles always add to 360 degrees](https://engineergurukul.com/resources/project-ideas/walk-a-polygon-exterior-angles-sum-360/): If you walk around any polygon and turn at each corner, the turns add up to one full turn of 360 degrees. From this the sum of the interior angles, (n minus 2) times 180 degrees, follows. - [Straw and hinge model of parallel lines cut by a transversal](https://engineergurukul.com/resources/project-ideas/straw-and-hinge-parallel-lines-transversal-angles/): Two parallel straws cut by a third straw make eight angles, and the model shows that corresponding angles and alternate angles are equal while co-interior angles add up to 180 degrees. Turning one straw so the lines are - [Twenty-four cubes: which box shape has the smallest surface area?](https://engineergurukul.com/resources/project-ideas/twenty-four-cubes-smallest-surface-area-box/): The same 24 sugar cubes or dice can be stacked into several boxes with the same volume, but their outside areas differ a lot. The box closest to a cube, 2 by 3 by 4, has the smallest surface area, which is why packing an - [One 40 cm thread loop, many shapes: which encloses the most area?](https://engineergurukul.com/resources/project-ideas/forty-cm-thread-loop-shapes-largest-area/): A closed loop of thread of fixed length can be made into a triangle, rectangle, square, hexagon or circle. The enclosed area grows as the shape gets more regular and is largest for the circle, so for a fixed perimeter th ### Earth and space, Class 6 to 8 - [Solar system model](https://engineergurukul.com/resources/project-ideas/solar-system-model/): The eight planets in order from the Sun, and how much bigger the giant planets are than Earth. Real distances are far too large to show to scale, so say so on your label. - [Water cycle in a bowl](https://engineergurukul.com/resources/project-ideas/water-cycle/): Warm water evaporates, the vapour condenses into drops on the cold cover, and the drops fall back like rain: the water cycle in miniature. - [Phases of the moon model](https://engineergurukul.com/resources/project-ideas/moon-phases/): Half of the Moon is always lit by the Sun. As the Moon travels round the Earth we see different amounts of that lit half, which gives the phases. They are not caused by the Earth’s shadow. - [Rain gauge](https://engineergurukul.com/resources/project-ideas/rain-gauge/): Rainfall is measured as the depth of water that would collect on flat ground, in millimetres. A straight-sided container gives a fair reading. - [Sundial](https://engineergurukul.com/resources/project-ideas/sundial/): As the Earth turns, the Sun appears to move across the sky and the pointer’s shadow moves with it. For better readings, tilt the pointer towards the north at an angle equal to your latitude (about 28 to 29 degrees in Del - [Seismograph model](https://engineergurukul.com/resources/project-ideas/seismograph/): A heavy hanging pen tends to stay still (inertia) while the box and paper shake beneath it, so the pen draws the shaking as a wiggly line. - [Layers of the Earth model](https://engineergurukul.com/resources/project-ideas/layers-of-the-earth/): The Earth has a thin rocky crust, a thick hot mantle, a liquid outer core and a solid inner core. - [Why we have seasons](https://engineergurukul.com/resources/project-ideas/seasons-model/): The Earth’s axis is tilted by about 23.5 degrees. As the Earth goes round the Sun, each half spends part of the year tilted towards the Sun, with stronger and longer sunlight: that is its summer. Seasons are not caused b - [Anemometer and wind vane](https://engineergurukul.com/resources/project-ideas/anemometer/): Wind pushes the cups round, and the faster the wind the more turns per minute. The wind vane points into the wind and shows the direction it is blowing from. - [Balloon-and-bottle barometer with a two-week weather log](https://engineergurukul.com/resources/project-ideas/bottle-barometer-weather-log/): Air pressure changes from day to day. When the outside pressure rises it presses the balloon skin inwards and the straw pointer tips up; when pressure falls before rain, the pointer tips down. - [Hair hygrometer that measures humidity with a single strand](https://engineergurukul.com/resources/project-ideas/hair-hygrometer-humidity-meter/): Human hair gets slightly longer when the air is humid and shorter when it is dry. A long hair pulling on a pointer turns this tiny change into a visible movement, which is how real hair hygrometers worked for two centuri - [Bottle wind vane on a compass rose that logs wind direction](https://engineergurukul.com/resources/project-ideas/wind-vane-with-compass-rose/): A wind vane turns until its large tail is pushed downwind, so the small arrow head points into the wind. Winds are named by the direction they come from, and the direction often changes before the weather does. - [Cloud in a squeezed bottle with warm water and a wisp of smoke](https://engineergurukul.com/resources/project-ideas/cloud-in-a-squeezed-bottle/): Clouds form when moist air expands and cools, and water vapour condenses on tiny particles. Squeezing the bottle warms and clears the air; letting go expands and cools it so a cloud appears, but only when smoke particles - [Cut-away model of a composite volcano with magma chamber and vents](https://engineergurukul.com/resources/project-ideas/composite-volcano-cross-section-model/): A composite volcano is built from alternating layers of hardened lava and ash. Magma rises from a chamber deep below through a central pipe and sometimes side vents, and the cut-away shows how the inside connects to the - [Hand-driven shake table that tests which tower survives an earthquake](https://engineergurukul.com/resources/project-ideas/shake-table-earthquake-building-test/): Earthquake waves shake the ground sideways. A simple shake table shows that wide-based, cross-braced and lighter-topped buildings stay up longer than tall, narrow, top-heavy ones, which is why real buildings in earthquak - [Three plate boundaries acted out with biscuits on a layer of jam](https://engineergurukul.com/resources/project-ideas/plate-boundaries-with-biscuits/): The Earth's crust is broken into plates that float on the soft upper mantle. Pushing two biscuits apart, together, or sideways shows how ridges, mountains and faults form at the three kinds of plate boundary. - [Rock cycle in a foil cup using crayon shavings](https://engineergurukul.com/resources/project-ideas/rock-cycle-with-crayon-shavings/): Crayon shavings pressed together act like sediment turning into sedimentary rock, pressed and warmed they become metamorphic rock, and melted and cooled they become igneous rock. The same changes, with real heat and pres - [Scratch test kit that ranks local rocks on the Mohs hardness scale](https://engineergurukul.com/resources/project-ideas/mineral-hardness-scratch-test/): A harder material scratches a softer one. Using a fingernail, a copper coin, a steel nail and a piece of glass as reference points, any rock or mineral can be placed on the Mohs hardness scale from 1 to 10. - [Jar settling test that finds the sand, silt and clay in garden soil](https://engineergurukul.com/resources/project-ideas/soil-texture-jar-settling-test/): Soil is a mixture of sand, silt and clay particles of different sizes. Shaken in water, the heavy sand sinks in a minute, silt in a few hours and clay over days, so the layers in the jar show the soil's texture. - [Funnel race that times how fast water drains through four soils](https://engineergurukul.com/resources/project-ideas/soil-permeability-funnel-race/): Water passes through soils at very different rates. Sand lets water through in seconds, clay holds it for a long time, and the result decides where groundwater forms, where floods happen and which crops grow. - [Solar eclipse model that shows the umbra and penumbra on a globe](https://engineergurukul.com/resources/project-ideas/solar-eclipse-umbra-penumbra-model/): A solar eclipse happens when the Moon passes between the Sun and the Earth and its shadow falls on the Earth. The dark inner shadow (umbra) covers only a small patch where the eclipse is total, and the lighter outer shad - [Lunar eclipse model that explains why the Moon turns red](https://engineergurukul.com/resources/project-ideas/lunar-eclipse-red-moon-model/): A lunar eclipse happens at full moon when the Earth moves between the Sun and the Moon and the Moon passes through the Earth's shadow. The Moon does not go fully black because the Earth's atmosphere bends red sunlight in - [Paper-cup constellation projector for seven Indian sky patterns](https://engineergurukul.com/resources/project-ideas/constellation-projector-cups/): Stars seem to form patterns called constellations. Cups with pinholes in the right pattern throw those patterns onto a dark wall, so a child learns to recognise Orion, the Great Bear, Cassiopeia and others before finding - [Moon and tides model with two bulges and a spinning Earth](https://engineergurukul.com/resources/project-ideas/moon-and-tides-two-bulge-model/): The Moon's gravity pulls the oceans into a bulge on the side facing it and a second bulge on the opposite side. As the Earth turns under the two bulges, most coasts see two high tides and two low tides a day. - [Solar system distances rolled out on a toilet paper strip](https://engineergurukul.com/resources/project-ideas/planet-distances-on-a-toilet-roll/): The planets are not evenly spaced. On a scale where the Sun to Neptune is 100 sheets of toilet paper, the four rocky planets all fit within about the first 5 sheets and the gaps between the outer planets grow huge, somet - [Shadow stick that finds true north and the real local noon](https://engineergurukul.com/resources/project-ideas/shadow-stick-finds-noon-and-north/): A vertical stick's shadow is longest at sunrise, shrinks until the Sun is highest, then grows again. The shortest shadow lies along the north-south line, pointing north for most of India for most of the year, and the tim - [Torch on a grid showing why slanting sunlight gives cooler seasons](https://engineergurukul.com/resources/project-ideas/sun-angle-and-seasons-torch-grid/): The same beam of light spread over a larger area heats each square less. Sunlight arrives at a slant in winter and spreads thin, which is the main reason winter is cold, not the small change in distance from the Sun. - [Globe with painted climate zone bands and India's climates marked](https://engineergurukul.com/resources/project-ideas/climate-zones-globe-bands/): The Earth has broad climate zones: the tropical zone between the Tropics of Cancer and Capricorn, the temperate zones up to the polar circles, and the polar zones. The Tropic of Cancer runs through the middle of India, s - [Stream table in a tray that grows river meanders and sandbars](https://engineergurukul.com/resources/project-ideas/stream-table-meander-model/): A river flowing over loose sediment erodes the outside of each bend, where water moves fastest, and deposits sand on the inside, where it is slow. Over time the bends grow into meanders and may be cut off to leave oxbow - [Growing a river delta where muddy water meets a still "sea"](https://engineergurukul.com/resources/project-ideas/river-delta-in-a-tray/): When a river reaches the sea it slows down suddenly and drops the sediment it was carrying. The sediment builds a fan of land called a delta that splits the river into many channels, which is how the Ganga-Brahmaputra an - [Aquifer in a jar with a working well and a pollution test](https://engineergurukul.com/resources/project-ideas/groundwater-aquifer-in-a-jar/): Groundwater is not an underground lake but water filling the spaces between grains of sand and gravel. A straw well draws it out, rain refills it from above, and anything spilled on the surface can reach the well, showin - [Moon crater tray that tests how drop height changes crater size](https://engineergurukul.com/resources/project-ideas/moon-crater-impact-flour-tray/): Craters on the Moon were made by rocks hitting its surface. Dropping marbles into flour from different heights shows that faster impacts make wider craters with longer rays, and that the Moon keeps its craters because it - [Thermocol ball model of the Earth with crust, mantle and core](https://engineergurukul.com/resources/project-ideas/thermocol-layers-of-the-earth-cutaway/): The Earth is made of layers: a thin crust, a thick mantle, a liquid outer core and a solid inner core. The cut-away shows their relative thickness. - [Paper-mache globe with latitude and longitude lines](https://engineergurukul.com/resources/project-ideas/newspaper-paper-mache-globe-latitude-longitude/): The globe shows how the Earth is a sphere, with latitudes parallel to the equator and longitudes running pole to pole. A place can be located by its two numbers. - [Cloth windsock that shows wind direction and strength](https://engineergurukul.com/resources/project-ideas/cloth-and-wire-windsock-wind-strength/): A windsock points away from the wind and lifts higher as the wind gets stronger. It is used at airports and can be compared with a Beaufort chart. - [Equatorial sundial from a paper plate tilted to your latitude](https://engineergurukul.com/resources/project-ideas/cardboard-equatorial-sundial-plate/): A sundial tells time by the shadow of a pointer that is parallel to the Earth’s axis. The shadow moves 15 degrees every hour because the Earth turns 360 degrees in 24 hours. - [Hand-crank orrery with bottle-cap planets that orbit at different speeds](https://engineergurukul.com/resources/project-ideas/cardboard-orrery-bottle-cap-planets-crank/): Planets nearer the Sun take less time to go round it. The crank turns four arms at different rates so you can see Mercury race ahead of Earth. - [Shoebox moon phases viewer with a foam ball and a torch](https://engineergurukul.com/resources/project-ideas/shoebox-moon-phases-viewer-ball-and-torch/): The Moon always has one half lit by the Sun, but we see different amounts of it as it moves round the Earth. The box shows each phase from the viewer’s eye. - [Crumpled paper watershed that traces rain and pollution to the river](https://engineergurukul.com/resources/project-ideas/crumpled-paper-watershed-map-traces-rain-and-pollution/): A watershed is the land that drains to one river. Spraying water on a crumpled sheet shows ridges, valleys and how water, and anything on the ground, ends up in the stream. - [Solar system to scale on a school field, planet by planet](https://engineergurukul.com/resources/project-ideas/planets-to-scale-school-field-walk/): When distances between planets are drawn to the same scale as their sizes, space turns out to be almost entirely empty. Walking from the Sun to Neptune makes this gap between worlds felt in your legs. - [Moon diary: sketching the Moon’s shape and rise time for 30 nights](https://engineergurukul.com/resources/project-ideas/moon-diary-thirty-nights/): The Moon’s lit shape changes in a steady cycle of about 29.5 days, and it rises roughly 50 minutes later each night. Your own sketches show this pattern better than any picture in a book. - [Star trail sketches that show the Earth turning](https://engineergurukul.com/resources/project-ideas/star-trail-sketches-earth-turning/): Stars appear to turn around the Pole Star because Earth spins on its axis once a day. Sketches made hours apart reveal arcs, and the amount of turning matches about 15 degrees an hour. - [Stretched cloth gravity well with marbles in orbit](https://engineergurukul.com/resources/project-ideas/stretched-cloth-gravity-well-marbles/): A heavy ball on a stretched cloth makes a dip, and small marbles rolled nearby curve round it and spiral in. This is a simple analogy for how a massive object like the Sun pulls on planets; unlike real planets in empty s - [ISRO missions timeline strip from Aryabhata to Gaganyaan](https://engineergurukul.com/resources/project-ideas/isro-missions-timeline-strip-model/): India’s space journey took place in steps, from a first satellite in 1975 to Moon and Mars missions and crewed spaceflight plans. A scaled timeline shows how fast the steps came and what each learnt. - [Globe and torch model of sunrise time gaps across India](https://engineergurukul.com/resources/project-ideas/india-single-time-zone-sunrise-gap/): India uses one standard time, but the Sun rises up to about two hours earlier in far-eastern Arunachal Pradesh than in western Gujarat. A globe and torch show why places east and west of each other have different local t - [Pinhole projector for watching a partial solar eclipse safely](https://engineergurukul.com/resources/project-ideas/pinhole-projector-partial-eclipse-viewing/): A tiny hole makes an upside-down image of the Sun on a screen. During a partial eclipse the image shows a bite taken out of the disc, so you can watch without looking at the Sun. - [Why we see one face of the Moon: a walk-around model with a friend](https://engineergurukul.com/resources/project-ideas/moon-one-face-walk-around-model/): The Moon turns once on its axis in the same time it takes to go once round Earth, so the same side always faces us. You can act this out with two people to feel why. - [Comet model whose tail always points away from the Sun](https://engineergurukul.com/resources/project-ideas/comet-model-tail-away-from-sun/): A comet’s tail always points away from the Sun, even when the comet is moving away. The solar wind and light push the dust and gas outwards, so the tail leads when the comet is going away. - [Mars rover model with rocker-bogie suspension from cardboard](https://engineergurukul.com/resources/project-ideas/mars-rover-rocker-bogie-model/): A rocker-bogie suspension lets a six-wheeled rover climb over rocks about as big as its wheels without tipping. The body stays almost level because the arms pivot. - [Cloud watching sketch book with cloud shapes](https://engineergurukul.com/resources/project-ideas/cloud-watching-sketch-book/): Clouds come in different shapes and heights, and each kind tells us something about the weather coming. - [Paper windsock that shows wind strength and direction](https://engineergurukul.com/resources/project-ideas/paper-windsock-wind-checker/): A windsock blows out like a flag in the wind. It points away from the wind direction and rises higher when the wind is stronger. - [Garden treasure hunt using north, south, east and west](https://engineergurukul.com/resources/project-ideas/garden-treasure-hunt-with-compass-directions/): Directions are named by the Sun and the compass. We find east where the Sun rises, then work out north, south and west. - [Evaporation race: wet cloth in sun, shade and wind](https://engineergurukul.com/resources/project-ideas/evaporation-race-wet-cloth-in-sun-and-shade/): Water dries by evaporation, turning into invisible vapour. Heat and wind make this happen faster. ### Electronics and robotics, Class 6 to 8 - [Automatic street light with an LDR](https://engineergurukul.com/resources/project-ideas/automatic-street-light/): A light dependent resistor (LDR) has a high resistance in the dark and a low resistance in light. A transistor uses that change to switch the LED on when it gets dark. - [Water level indicator](https://engineergurukul.com/resources/project-ideas/water-level-indicator/): Tap water conducts a little electricity because of the salts dissolved in it. As the water rises it touches wires at different heights, and transistors light an LED or sound a buzzer for each level. - [Foil and foam pressure pad that lights an LED when pressed](https://engineergurukul.com/resources/project-ideas/foil-pressure-pad-switch-led/): A switch is just a gap in a circuit that can be closed. Two foil sheets held apart by a foam ring touch when pressed, completing the circuit so current flows through the LED. - [Pocket dark detector that beeps when you cover the LDR](https://engineergurukul.com/resources/project-ideas/ldr-dark-detector-buzzer/): A light dependent resistor has a low resistance in bright light and a very high resistance in the dark. In a voltage divider with a fixed resistor, this change swings the base voltage of a transistor, which switches a bu - [Sunlight meter: an LED that glows brighter as the light increases](https://engineergurukul.com/resources/project-ideas/ldr-sunlight-meter-led/): When an LDR is placed in series with an LED, more light lowers the LDR resistance, more current flows and the LED glows brighter. The LED becomes a simple meter for how bright the room is. - [Bucket overflow alarm that beeps when water touches two wires](https://engineergurukul.com/resources/project-ideas/bucket-overflow-alarm-darlington/): Tap water conducts a small current because of dissolved salts. Two BC547 transistors joined as a Darlington pair multiply that tiny current enough to drive a buzzer, so the alarm sounds the moment water bridges the probe - [Rain alarm with an interleaved foil strip sensor on a card](https://engineergurukul.com/resources/project-ideas/rain-alarm-foil-strip-sensor/): Raindrops bridge the gap between two sets of foil strips that are close but not touching. The water lets a tiny current flow, which a Darlington pair of BC547 transistors amplifies to sound a buzzer, warning you to bring - [Morse code key from a paper clip and drawing pin with a buzzer](https://engineergurukul.com/resources/project-ideas/paper-clip-morse-key-buzzer/): A telegraph key is a spring switch that closes a circuit for short or long moments. Pressing the paper clip onto a drawing pin completes the loop, and the pattern of short and long beeps carries letters in Morse code. - [Two-station Morse telegraph line across a room with LEDs](https://engineergurukul.com/resources/project-ideas/two-station-morse-telegraph-line/): Two keys and two indicator LEDs on one long wire pair let either station send to the other. It shows that a signal is really a current switched on and off, and that one shared return wire is enough for a two-way line. - [Electric quiz board with brass fasteners and a foil answer path](https://engineergurukul.com/resources/project-ideas/brass-fastener-electric-quiz-board/): Each question fastener is secretly wired to its correct answer fastener behind the board. Touching the two probes to a matching pair completes the circuit and lights the LED, so the board tests both knowledge and the ide - [Scrubbing brush bristlebot driven by an off-centre motor weight](https://engineergurukul.com/resources/project-ideas/scrubbing-brush-bristlebot-offset-motor/): A motor spinning an unbalanced weight shakes the whole brush. The angled bristles push forward on every shake and slip backward on the return, so the vibration turns into movement in one direction. - [Cup scribble bot that draws with three markers and a vibrating motor](https://engineergurukul.com/resources/project-ideas/cup-scribble-bot-vibrating-markers/): An unbalanced motor on a plastic cup makes it wobble on three marker legs, and the wobble is traced out as a looping drawing. The pattern depends on the weight, the speed and how far apart the legs are. - [Energy transfer: one toy motor spins another that lights an LED](https://engineergurukul.com/resources/project-ideas/motor-to-motor-generator-link/): A DC motor is also a generator. When a second motor is turned by the first, its coil spins inside its magnets and produces a voltage that lights an LED, showing that electrical and mechanical energy can be converted in b - [Salt water conductivity tester with a transistor and an LED](https://engineergurukul.com/resources/project-ideas/salt-water-conductivity-tester-transistor/): Water conducts electricity only through dissolved ions. Two probes in a liquid feed a tiny current into a transistor, which amplifies it to light an LED. Distilled water and sugar water give little or nothing, while tap - [Pocket continuity tester with a buzzer and an LED in a tic-tac box](https://engineergurukul.com/resources/project-ideas/pocket-continuity-tester-buzzer-led/): A continuity tester tells you whether a path conducts: touch its two probes to the ends of a wire, a fuse or a switch and it beeps if current can flow. It is the first tool for finding broken wires and checking which mat - [Steady hand wire loop game with a buzzer and a penalty LED](https://engineergurukul.com/resources/project-ideas/steady-hand-wire-loop-buzzer-game/): A bent bare wire and a wand loop form a switch that closes whenever your hand shakes and the loop touches the wire. The buzzer and LED make the contact obvious, turning a simple circuit into a game. - [Cardboard table fan with a bottle propeller and a slide switch](https://engineergurukul.com/resources/project-ideas/cardboard-table-fan-dc-motor-switch/): A DC motor turns electrical energy into rotation. Angled blades cut from a bottle push air backwards as they turn, so a breeze comes forward, and a switch in the circuit starts and stops the fan. - [Cardboard conveyor belt driven by a toy motor and rubber band](https://engineergurukul.com/resources/project-ideas/cardboard-conveyor-belt-rubber-band-drive/): A motor turns a small pulley, a rubber band carries that rotation to a larger roller, and a loop of cloth belt stretched between two rollers moves objects along. It shows belt drives, friction grip and speed reduction th - [Motorised cardboard crane that lifts a load with a thread spool and reversing switch](https://engineergurukul.com/resources/project-ideas/motorised-spool-crane-reversing-switch/): A motor winding thread onto a spool converts rotation into lifting. A DPDT slide switch swaps the battery polarity so the same motor raises and lowers the hook, which is how real crane winches are controlled. - [Traffic light with red, amber and green LEDs on three push switches](https://engineergurukul.com/resources/project-ideas/three-switch-traffic-light-leds/): Three LEDs each with their own resistor and switch share one battery. Each switch controls only its own branch, which is a parallel circuit, the way the lights in a house are wired so that one can be on while the others - [Magnetic door alarm with a reed switch that sounds when the door opens](https://engineergurukul.com/resources/project-ideas/reed-switch-door-open-alarm/): A reed switch closes when a magnet is near and opens when it moves away. With the magnet on the door and the switch on the frame, opening the door removes the magnet, and a transistor circuit turns the buzzer on, the sam - [Bicycle wheel revolution flasher with a spoke magnet and a reed switch](https://engineergurukul.com/resources/project-ideas/bicycle-wheel-reed-switch-revolution-flasher/): A magnet on a spoke closes a reed switch on the fork once every turn, flashing an LED. Counting flashes in a known time and knowing the wheel circumference gives the bicycle speed, the same method a bike speedometer uses - [Solar powered spinner: a small solar cell drives a toy motor top](https://engineergurukul.com/resources/project-ideas/solar-cell-spinning-top-motor/): A solar cell turns light directly into electrical energy. Connected to a toy motor with a paper disc, it spins in sunlight, slows in shade and stops indoors, showing how output depends on the amount and angle of light. - [Staircase light with two switches that each turn one LED on and off](https://engineergurukul.com/resources/project-ideas/staircase-two-way-switch-led/): Two single-pole double-throw switches wired together let you switch one lamp from either end of a staircase. Flipping either switch changes whether the loop is complete. - [LED strings on a 9 V battery: working out resistors for series and parallel](https://engineergurukul.com/resources/project-ideas/series-parallel-led-strings-9v-resistor-sums/): Three red LEDs in series share one resistor and draw one LED worth of current, while three in parallel each need their own resistor and draw three times as much. Working out the resistor with R = (supply minus LED voltag - [Knob dimmer for an LED using a 10 kΩ potentiometer on a 9 V battery](https://engineergurukul.com/resources/project-ideas/potentiometer-led-dimmer-knob/): A potentiometer wired as a variable resistor changes how much current an LED gets, so turning the knob dims or brightens the light. Less resistance gives more current and more light. - [Weak cell finder: loaded and unloaded voltage of old and new AA cells](https://engineergurukul.com/resources/project-ideas/weak-cell-finder-loaded-voltage-test/): A cell that reads 1.4 V with nothing connected can still be nearly flat, because its internal resistance has grown. A voltage reading while it lights a small bulb shows the true condition. - [Quiz board where matching question and answer wires light an LED](https://engineergurukul.com/resources/project-ideas/quiz-board-matching-pairs-buzzer-led/): A circuit is only complete when a wire joins the right pair of terminals. Touching a probe wire to the correct answer closes the loop and lights an LED, while a wrong answer leaves it open. - [Tripwire alarm: a clothes peg with foil contacts and a pull-out card](https://engineergurukul.com/resources/project-ideas/tripwire-peg-alarm-thread-card/): A plastic card between two foil contacts keeps a circuit open. Pulling the card out by a thread lets the contacts touch, which closes the circuit and sounds a buzzer. - [Pencil lead rheostat that dims a torch bulb as the clip slides along the graphite](https://engineergurukul.com/resources/project-ideas/pencil-graphite-rheostat-length-resistance/): Graphite conducts, but not as well as copper. The longer the length of lead the current has to pass through, the more resistance it has, so the bulb gets dimmer as you move the clip away. - [Push button LED that fades out slowly, powered by a charged capacitor](https://engineergurukul.com/resources/project-ideas/capacitor-fade-out-led-push-button/): A capacitor stores charge like a tiny rechargeable tank. A quick press of a button fills it, and when the button is released the capacitor keeps the LED glowing for several seconds as it empties. - [Secret code box: four toggle switches in series that light an LED in one setting](https://engineergurukul.com/resources/project-ideas/secret-code-box-four-toggle-switches-series/): Switches in series work like the word AND: the loop is complete only if every switch is in its correct position. With four two-way toggles there are 16 settings and only one lights the LED. - [Tilt alarm from a steel ball in a straw tube that rings a buzzer](https://engineergurukul.com/resources/project-ideas/ball-bearing-tilt-alarm-straw-tube/): A small steel ball rolls to the low end of a tube when it is tilted and bridges two bare wires there. This completes a circuit, so the object is warned when it moves out of the upright position. - [Forward and reverse toy car using one DPDT switch and a motor](https://engineergurukul.com/resources/project-ideas/forward-reverse-toy-car-dpdt-switch/): The direction of a DC motor depends on the direction of the current through it. A double-pole double-throw switch wired crosswise swaps the battery connections and so reverses the car. - [How fast a toy motor spins with one, two, three and four AA cells](https://engineergurukul.com/resources/project-ideas/toy-motor-rpm-against-voltage-cells/): The speed of a DC motor rises almost in proportion to the voltage across it. More cells in series give more speed and also a larger current. - [Plant pot dry soil alert with two steel nails, a BC547 and an LED](https://engineergurukul.com/resources/project-ideas/plant-pot-dry-soil-alert-nails-bc547/): Damp soil conducts electricity far better than dry soil. A transistor circuit lights a red LED when the soil resistance between two nails rises, which tells you the plant needs water. - [Propeller thrust test: how blade angle and blade number change the push](https://engineergurukul.com/resources/project-ideas/propeller-blade-angle-thrust-balance-motor/): A propeller pushes air backwards and is pushed forwards in return. The size of the push depends on how many blades there are and how they are angled to the air. - [Foam tray toy boat with a toy motor, propeller and slide switch](https://engineergurukul.com/resources/project-ideas/foam-tray-toy-boat-motor-propeller/): A motor-driven propeller pushes water backwards and the boat moves forward, which is Newton’s third law. A well-shaped, light hull floats because the water it pushes aside weighs as much as the boat. - [Coin-cell LED night lamp with an ice-cream stick switch](https://engineergurukul.com/resources/project-ideas/coin-cell-led-lamp-with-stick-switch/): A complete circuit of a cell, an LED and a switch lights the lamp. It shows that current flows only in a closed loop and that an LED works in one direction only. - [Cardboard traffic signal with three LEDs and a rotary switch](https://engineergurukul.com/resources/project-ideas/cardboard-traffic-signal-three-led-switch/): Each lamp has its own switch pad that joins it to the same cells. The model shows red, yellow and green lights and teaches how a circuit is completed. - [Conductor or insulator? Tester with one cell and a bulb](https://engineergurukul.com/resources/project-ideas/conductor-or-insulator-tester-with-one-cell-and-bulb/): Some materials let electric current pass and some do not. A bulb lights up when the circuit is complete and a conductor is in the gap. - [Cardboard lighthouse that lights with one cell and a bulb](https://engineergurukul.com/resources/project-ideas/cardboard-lighthouse-with-a-bulb/): A complete circuit with a cell, a bulb and a switch makes light. A lighthouse model shows how light guides ships at night. ### Environment, Class 6 to 8 - [Plastic bottle bird feeder](https://engineergurukul.com/resources/project-ideas/bottle-bird-feeder/): Waste plastic can be reused instead of thrown away, and a feeder lets you observe local birds. Keep a diary of which birds visit and when. - [Food chain and food web model](https://engineergurukul.com/resources/project-ideas/food-chain/): Energy passes from plants to plant-eaters to meat-eaters. Taking one living thing out of the web affects all the others. - [Rainwater harvesting model](https://engineergurukul.com/resources/project-ideas/rainwater-harvesting/): Rain falling on a roof is collected by gutters and pipes, filtered, and either stored in a tank or sent down a recharge pit to refill the groundwater. - [Three-layer water filter](https://engineergurukul.com/resources/project-ideas/water-filter/): Gravel, sand and charcoal trap particles of different sizes, and charcoal also removes some colour and smell. The water looks clearer but is still not safe to drink, because germs pass through. - [Solar water heater model](https://engineergurukul.com/resources/project-ideas/solar-water-heater/): Black surfaces absorb more sunlight than shiny or white ones, and a clear cover traps the heat, so water in a black, covered container warms fastest. - [Soil erosion with and without plants](https://engineergurukul.com/resources/project-ideas/soil-erosion/): Plant roots hold soil together. When water is poured on, bare soil washes away much faster than soil covered with grass or dead leaves. - [Compost in a bottle](https://engineergurukul.com/resources/project-ideas/compost-in-a-bottle/): Microbes and small creatures break peels and leaves down into compost, but plastic does not break down. Layers of wet "greens" and dry "browns" rot best. - [Greenhouse effect in a jar](https://engineergurukul.com/resources/project-ideas/greenhouse-effect-jar/): A covered jar in the sun warms faster than an open one. It is a simple model of how greenhouse gases keep heat near the Earth; the real atmosphere traps heat by absorbing infrared rather than by stopping air moving. - [Air pollution sticky cards](https://engineergurukul.com/resources/project-ideas/air-pollution-cards/): Dust and soot in the air settle on surfaces. Sticky cards left in different places show where the air carries the most particles. - [Drip irrigation from plastic bottles](https://engineergurukul.com/resources/project-ideas/bottle-drip-irrigation/): Water dripping slowly at the roots reaches the plant with far less waste than flooding, because less water runs off or evaporates. - [What rots and what does not: a six-week burial test](https://engineergurukul.com/resources/project-ideas/what-rots-burial-test/): Natural materials such as peels and leaves are broken down by soil organisms within weeks, paper and cotton more slowly over weeks to months, while plastic, foil and glass stay almost unchanged. Burying samples and diggi - [Vermicompost tub that turns kitchen peels into worm castings](https://engineergurukul.com/resources/project-ideas/vermicompost-tub-with-earthworms/): Composting worms eat vegetable waste and pass it out as dark, crumbly castings that are a rich plant food. A tub with drainage, bedding and the right moisture turns a family's peels into compost and shows how much kitche - [One-week plastic audit of a household with a bar chart of sources](https://engineergurukul.com/resources/project-ideas/one-week-household-plastic-audit/): Counting and weighing every piece of plastic a family throws away in a week shows where it comes from: packaging of snacks, milk pouches, carry bags and bottles. Sorting it by type and by whether it can be recycled shows - [How much water a dripping tap wastes, measured and scaled to a year](https://engineergurukul.com/resources/project-ideas/dripping-tap-water-loss-measure/): A tap that drips once a second seems harmless, but catching the drips for ten minutes and multiplying up shows it wastes well over a thousand litres a year, enough to fill about eight 200-litre drums. Measurement turns a - [Bucket versus running tap: measuring water used for daily tasks](https://engineergurukul.com/resources/project-ideas/bucket-versus-running-tap-comparison/): The same task, such as brushing teeth, washing hands or washing a plate, uses many times more water when the tap runs than when water is taken from a mug or bucket. Measuring both ways gives the family hard numbers for s - [Leaf dust tape test comparing air quality on five streets](https://engineergurukul.com/resources/project-ideas/leaf-dust-tape-test-air-quality/): Dust and soot from traffic settle on leaves. Pressing clear tape on leaves from different places and sticking it on white paper gives a visible grey patch whose darkness shows how dusty the air is at each spot. - [Noise map of your neighbourhood with a phone decibel meter](https://engineergurukul.com/resources/project-ideas/noise-survey-with-a-phone-meter/): Sound level is measured in decibels, a scale where every 10 decibels sounds about twice as loud. Measuring at the same spots at different times of day gives a noise map that shows where and when levels pass the limits se - [Tree census of the school ground with species, girth and shade area](https://engineergurukul.com/resources/project-ideas/school-tree-census-with-girth/): A census records every tree in an area with its species, girth and canopy, the same way city forest departments do. The data show which species dominate, which trees are oldest, how much ground is shaded, and where new t - [Biodiversity diary of one square metre kept for a month](https://engineergurukul.com/resources/project-ideas/one-metre-square-biodiversity-diary/): Even one square metre of garden or wasteland holds dozens of kinds of living things: grasses, weeds, ants, beetles, spiders, snails, birds that visit. Watching the same patch daily and recording every species shows how r - [Dawn bird count at three points with a simple species chart](https://engineergurukul.com/resources/project-ideas/dawn-bird-count-point-survey/): Birds are easiest to count at dawn when they call and feed. Counting every bird seen or heard for ten minutes at fixed points, a method called a point count, shows which species live near you and how a park, a road and a - [Gravity-fed bottle bird feeder that refills itself](https://engineergurukul.com/resources/project-ideas/gravity-fed-bottle-bird-feeder/): Seeds fall under gravity to fill a small tray as birds eat them, so the feeder keeps itself topped up. It shows gravity and also helps garden birds in the hot summer. - [Recycled paper sheets made from old newspaper pulp](https://engineergurukul.com/resources/project-ideas/recycled-paper-from-newspaper-pulp/): Paper is made of plant fibres, and these fibres can be soaked, mashed and pressed into new sheets. Recycling saves trees and water. - [Sealed bottle terrarium: a mini ecosystem that recycles its own water](https://engineergurukul.com/resources/project-ideas/sealed-bottle-terrarium-mini-ecosystem/): Plants, soil and water in a closed bottle recycle water through transpiration and condensation. It models how the Earth’s own cycles work. - [Bowl and cup solar still that separates fresh water from salt water](https://engineergurukul.com/resources/project-ideas/bowl-and-cup-solar-still-for-drinking-water/): Water evaporates in the sun and condenses on cool plastic, leaving salt behind. It is a small model of how the water cycle and distillation work. - [How many litres does your family use in a day? A water audit](https://engineergurukul.com/resources/project-ideas/family-daily-water-use-audit-litres-per-person/): You measure how much water each daily activity uses by counting buckets, mugs and tap flows, and then work out litres per person per day. The result helps find where water can be saved. - [Foil panel solar cooker that warms a pot of water](https://engineergurukul.com/resources/project-ideas/foil-panel-solar-cooker-warms-a-pot/): A panel cooker uses flat foil-covered reflectors to bounce extra sunlight onto a dark pot sealed in a clear bag. It shows that sunlight can heat water without any fuel. - [Solar still in a basin that separates fresh water from salty water](https://engineergurukul.com/resources/project-ideas/solar-still-bottle-makes-drinking-water/): Sunlight evaporates water from salty or muddy water, and the vapour condenses on a cool plastic sheet as water with the salt left behind. It models how free heat can separate fresh water from sea or borewell water. - [Straw, leaf, paper and bare soil: which mulch keeps pots moistest?](https://engineergurukul.com/resources/project-ideas/mulch-types-and-soil-moisture-in-pots/): A layer of mulch slows evaporation from the soil surface. Weighing identical pots each day shows how much water each mulch saves, which helps farmers during dry spells. - [Terraces and contour furrows against straight slopes: runoff model](https://engineergurukul.com/resources/project-ideas/terraces-and-contour-furrows-cut-runoff-model/): Terracing and ploughing along the contours slow rain runoff and hold soil on hillsides. A sand tray model measures the soil and water lost on each slope. - [Five home water cleaning methods ranked with a clarity tube](https://engineergurukul.com/resources/project-ideas/five-home-water-cleaning-methods-ranked-by-clarity/): Cloth, sand, charcoal, alum and boiling each do different jobs. A homemade clarity tube ranks how well each method clears water, and the project explains which methods also remove germs. - [Newspaper roll pencil stand](https://engineergurukul.com/resources/project-ideas/newspaper-roll-pencil-stand/): Old newspaper can be turned into something useful. Reusing paper saves trees and reduces waste. - [Bottle cap mosaic picture of a fish or a flower](https://engineergurukul.com/resources/project-ideas/bottle-cap-mosaic-picture/): Plastic caps can be reused to make art. We sort by colour and see how many small parts make a large picture. - [Newspaper gift bag to replace plastic bags](https://engineergurukul.com/resources/project-ideas/newspaper-gift-bag-no-plastic/): A strong paper bag can be folded from old newspaper, which cuts down use of plastic bags. Folding and gluing teach geometry too. - [Plastic bottle hanging planter for a small herb](https://engineergurukul.com/resources/project-ideas/plastic-bottle-hanging-planter/): A waste bottle can hold soil and a living plant. Drainage holes let extra water out so roots do not rot. ### Computing and coding, Class 6 to 8 - [Scratch game: catch the falling fruit with a bowl](https://engineergurukul.com/resources/project-ideas/scratch-catch-the-falling-fruit-game/): Variables keep score and lives, and a forever loop with an if block checks again and again whether the fruit touched the bowl. This is the core idea of every simple video game. - [Scratch maze game that senses wall colour](https://engineergurukul.com/resources/project-ideas/scratch-maze-game-arrow-keys-colour-sensing/): The sprite reads the colour under it with the touching colour block, so you can draw any maze and the game still works. It shows how input from the keyboard turns into movement. - [Scratch times-table quiz with random questions and score](https://engineergurukul.com/resources/project-ideas/scratch-times-table-quiz-with-ask-and-answer/): A loop asks random multiplication questions, reads what you type with the answer block and compares it with the right product. It shows how a program takes input and makes decisions. - [Scratch animated story of a monsoon day using broadcasts](https://engineergurukul.com/resources/project-ideas/scratch-monsoon-day-story-with-broadcast-messages/): Broadcast messages let sprites talk to each other, so scenes happen in order without anyone clicking. It shows how separate scripts cooperate in one program. - [Scratch pen rangoli: rotating squares make a flower](https://engineergurukul.com/resources/project-ideas/scratch-pen-rangoli-pattern-with-nested-loops/): A loop inside a loop draws a square 36 times, each turned a little, and the result is a rangoli-like flower. It shows how repeating a simple shape with a small turn builds complex patterns. - [Scratch flying-bird game with gravity and moving pipes](https://engineergurukul.com/resources/project-ideas/scratch-flappy-bird-style-gravity-game/): A speed variable that keeps decreasing acts like gravity, and a key press resets it upward. It teaches how simple rules about speed produce natural-looking motion. - [Scratch analogue clock that shows the real time](https://engineergurukul.com/resources/project-ideas/scratch-analogue-clock-with-sensing-block/): Three hands are turned by formulas using the current hour, minute and second from the computer’s clock. It links maths on angles to coding. - [Scratch road-crossing safety game with a pedestrian signal](https://engineergurukul.com/resources/project-ideas/scratch-road-crossing-safety-game-traffic-signal/): A signal sprite changes between stop and walk using wait blocks, and a child sprite checks the signal before moving. It teaches road safety and conditional logic together. - [Scratch two-player pong with paddles and a bouncing ball](https://engineergurukul.com/resources/project-ideas/scratch-two-player-pong-with-bounce-direction/): The ball bounces off the walls and the paddles by changing its direction. It teaches how direction angles work and how two players share one program. - [Scratch Hindi to English word game using two lists](https://engineergurukul.com/resources/project-ideas/scratch-hindi-english-word-match-game-with-lists/): Two lists hold matching words at the same positions, and the program picks a random position to ask a question. It shows how lists store related data in order. - [Scratch reaction-time tester using the timer block](https://engineergurukul.com/resources/project-ideas/scratch-reaction-time-tester-with-timer/): The program waits a random time, changes the colour, and measures how long you take to press a key. It shows how the timer block measures short intervals and how a list can store results. - [Python general knowledge quiz using a dictionary](https://engineergurukul.com/resources/project-ideas/python-quiz-game-with-dictionary-and-score/): A dictionary stores questions with their answers, a for loop asks them one by one, and an if statement compares answers. It is the first full program most students write. - [Python guess-the-number game with hints and a limit](https://engineergurukul.com/resources/project-ideas/python-guess-the-number-with-hints-and-attempt-limit/): The computer picks a secret number with the random module and gives too high or too low hints. Using the hints well is a binary search, which finds a number from 1 to 100 in at most seven guesses. - [Python turtle spirograph of coloured circles](https://engineergurukul.com/resources/project-ideas/python-turtle-spirograph-colour-art/): Python’s turtle module draws on a window. Drawing 72 circles with a 5 degree turn each time makes a spirograph, which shows how loops and angles create patterns. - [Python rock paper scissors with a rules dictionary](https://engineergurukul.com/resources/project-ideas/python-rock-paper-scissors-with-win-rules-table/): The computer picks randomly and a dictionary stores what beats what, so the winner is found without a long list of if statements. It shows how data can replace repeated code. - [Python unit converter for length, mass and temperature](https://engineergurukul.com/resources/project-ideas/python-unit-converter-menu-length-mass-temperature/): The program converts between units using stored factors and the Celsius to Fahrenheit formula. It combines maths with menus and functions. - [HTML personal home page with a photo, list and links](https://engineergurukul.com/resources/project-ideas/html-personal-home-page-with-headings-lists-and-links/): A web page is a text file with tags that tell the browser what each part is. This project builds a first page using headings, paragraphs, an image, a list and links. - [HTML recipe page for poha with ingredient and step lists](https://engineergurukul.com/resources/project-ideas/html-recipe-page-for-poha-with-ordered-and-unordered-lists/): Ingredients go in an unordered list and the method in an ordered list, so the browser numbers the steps automatically. It shows how to choose the right tag for the meaning. - [HTML class timetable with merged cells and striped rows](https://engineergurukul.com/resources/project-ideas/html-class-timetable-table-with-colspan-and-zebra-rows/): An HTML table with rows, headings and merged cells shows a weekly timetable, and CSS stripes the rows for easy reading. It teaches tables, colspan and the nth-child selector. - [Spreadsheet monthly household budget with over-budget checks](https://engineergurukul.com/resources/project-ideas/spreadsheet-household-monthly-budget-with-sum-and-checks/): A planned and an actual column are compared with formulas that give the difference and warn when spending exceeds the plan. It teaches the basics of budgeting and spreadsheet formulas. - [Spreadsheet marksheet with total, percentage, grade and result](https://engineergurukul.com/resources/project-ideas/spreadsheet-marksheet-with-total-percentage-grade-and-result/): Formulas work out each student’s total, percentage, grade and pass or fail, and nested IF handles the grade bands. It shows how report cards can be calculated automatically. - [Spreadsheet survey: pie chart of how classmates travel to school](https://engineergurukul.com/resources/project-ideas/spreadsheet-pie-chart-of-how-classmates-travel-to-school/): Survey answers are counted with COUNTIF and shown as a pie chart with percentages. It teaches data collection, counting and choosing the right chart. - [Spreadsheet pocket money tracker with a running balance](https://engineergurukul.com/resources/project-ideas/spreadsheet-pocket-money-tracker-with-running-balance-and-line-chart/): A running balance formula adds income and subtracts spending on every row, and a line chart shows how the balance changes over the month. It teaches saving habits and cell references. - [Spreadsheet temperature heat map for a month](https://engineergurukul.com/resources/project-ideas/spreadsheet-temperature-heat-map-with-conditional-colours/): Daily maximum temperatures are coloured from cool to hot with a colour scale and summarised with AVERAGE, MAX and MIN. It shows how colour helps people see patterns in numbers. - [Spreadsheet sports day scoreboard using SUMIF](https://engineergurukul.com/resources/project-ideas/spreadsheet-sports-day-house-scoreboard-with-sumif/): Points from many events are added for each house with SUMIF, ranked and drawn as a bar chart. It shows how one list of results can produce a summary. - [Digital safety survey: how classmates handle passwords](https://engineergurukul.com/resources/project-ideas/digital-safety-survey-of-classmates-password-habits/): An anonymous survey of habits, such as sharing passwords or reusing one everywhere, gives percentages and a bar chart. It shows which habits put accounts at risk and how to improve them. - [Digital safety test: can friends spot fake messages?](https://engineergurukul.com/resources/project-ideas/digital-safety-spot-the-phishing-message-sorting-test/): A set of made-up messages, some genuine-looking and some fake, is sorted by friends using a checklist, and the results show which tricks work best. It teaches how to recognise phishing and scam messages. - [Digital wellbeing: a one-week screen-time diary and plan](https://engineergurukul.com/resources/project-ideas/digital-wellbeing-screen-time-diary-for-one-week/): Daily screen time for study, play and chat is logged for a week, averaged and charted, then a plan is made and tested. It teaches self-observation and healthy habits with data. - [Media literacy: check five forwarded messages before sharing](https://engineergurukul.com/resources/project-ideas/media-literacy-check-five-forwarded-messages-before-you-share/): Forwarded claims are checked with a three-step method: who says it, when, and what do reliable sources say. It teaches how to stop false information from spreading. - [Paper flowchart for an ATM withdrawal with three PIN tries](https://engineergurukul.com/resources/project-ideas/flowchart-for-an-atm-cash-withdrawal-with-pin-retries/): A flowchart with decision diamonds and a loop describes the steps of an ATM withdrawal, including three PIN attempts and a balance check. It shows how to plan an algorithm before coding it. - [Sorting number cards by hand: bubble sort against selection sort](https://engineergurukul.com/resources/project-ideas/sorting-number-cards-by-hand-bubble-versus-selection/): Eight number cards are sorted by two methods while counting comparisons and swaps. It shows how different algorithms reach the same answer with different amounts of work. - [Binary number cards that count from 0 to 31 on paper](https://engineergurukul.com/resources/project-ideas/binary-number-cards-count-from-zero-to-thirty-one/): Five cards with dots for 1, 2, 4, 8 and 16 show any number up to 31 by turning cards face up or down. It teaches how computers store numbers using only on and off, which are the digits 1 and 0. ### Physics, Class 9 and 10 - [Hydraulic arm with syringes](https://engineergurukul.com/resources/project-ideas/hydraulic-arm/): Pressure applied to a liquid in a closed system is passed on equally in every direction (Pascal’s law), so pushing one syringe moves its partner and lifts the arm. - [Electromagnet](https://engineergurukul.com/resources/project-ideas/electromagnet/): An electric current in a coil of wire makes a magnetic field. Wound round an iron nail, the coil becomes a magnet you can switch off, and more turns of wire make it stronger. - [Simple electric motor](https://engineergurukul.com/resources/project-ideas/simple-electric-motor/): A coil carrying current in a magnetic field feels a force and turns. Scrape the insulation off one end of the coil wire completely, but off only the top half of the other end: the current then flows for half of each turn - [Wind turbine that lights an LED](https://engineergurukul.com/resources/project-ideas/wind-turbine-led/): A small DC motor works as a generator when its shaft is turned: if the blades spin fast enough, the motor turns motion energy into electrical energy that lights the LED. - [Plastic bottle vacuum cleaner](https://engineergurukul.com/resources/project-ideas/bottle-vacuum-cleaner/): A small fan blows air out of the back of the bottle, lowering the pressure inside, so outside air rushes in through the nozzle carrying dust and paper bits with it. - [AC generator (electromagnetic induction)](https://engineergurukul.com/resources/project-ideas/ac-generator/): When a coil turns in a magnetic field, the changing magnetic field through it induces a current (Faraday’s law). The current reverses every half turn, which is alternating current. - [Human eye and its defects](https://engineergurukul.com/resources/project-ideas/human-eye-defects/): The eye lens focuses light on the retina. In short sight the image forms in front of the retina and a concave lens corrects it; in long sight it forms behind the retina and a convex lens corrects it. - [Light trapped in a stream of water](https://engineergurukul.com/resources/project-ideas/light-in-a-water-stream/): Light inside the water meets the surface at a large angle and is totally internally reflected, so it follows the curved stream. Optical fibres carry internet signals the same way. - [Hydroelectric power plant model](https://engineergurukul.com/resources/project-ideas/hydroelectric-plant/): Water stored high up has potential energy. As it falls it turns a turbine, and a generator on the turbine’s shaft turns that motion into electricity. - [Water bottle rocket](https://engineergurukul.com/resources/project-ideas/water-bottle-rocket/): Pumped-in air pushes the water out of the nozzle downwards, and the rocket is pushed upwards (Newton’s third law). A little water (about one third of the bottle is a good start) gives far more thrust than an empty bottle - [Ohm’s law checked on a pencil-lead resistor with a V-I graph](https://engineergurukul.com/resources/project-ideas/ohms-law-with-a-pencil-lead-resistor/): For a graphite pencil lead at steady temperature, the current through it is directly proportional to the voltage across it. The V against I graph is a straight line through the origin and its slope is the resistance (Ohm - [How resistance changes with the length and thickness of nichrome wire](https://engineergurukul.com/resources/project-ideas/resistance-against-wire-length-and-thickness/): The resistance of a wire is directly proportional to its length and inversely proportional to its area of cross section (R = rho L / A). Doubling the length doubles R, and joining two equal wires side by side in parallel - [Demonstration board comparing series and parallel torch bulbs](https://engineergurukul.com/resources/project-ideas/series-and-parallel-bulb-brightness-board/): In a series circuit the same current flows through every bulb and the voltage is shared, so each bulb glows dimly and all go out if one is removed. In parallel each bulb gets the full cell voltage, glows brightly, and th - [Conductivity of salt water against concentration with two carbon rods](https://engineergurukul.com/resources/project-ideas/salt-water-conductivity-against-concentration/): Pure water barely conducts, but dissolved salt gives free ions that carry current. The current through a salt solution rises with concentration, nearly in proportion for weak solutions and then more slowly as the ions cr - [Electromagnet lifting power against number of turns and current](https://engineergurukul.com/resources/project-ideas/electromagnet-strength-against-number-of-turns/): The strength of an electromagnet grows with the number of turns of wire and with the current through it. Counting the pins it lifts for 20, 40, 60 and 80 turns gives a clear upward trend. - [Homopolar motor from a screw, a cell and a neodymium magnet](https://engineergurukul.com/resources/project-ideas/homopolar-motor-from-a-screw-and-a-cell/): A current flowing through a magnet in a magnetic field feels a sideways force (F = B I L), and here that force makes the magnet and screw spin at hundreds of revolutions per minute. It is the simplest motor that works wi - [Shake torch: a magnet moving through a coil lights an LED](https://engineergurukul.com/resources/project-ideas/shake-torch-faraday-induction-coil/): Moving a magnet through a coil changes the magnetic flux through it and induces an emf (Faraday’s law), which lights an LED with no cell at all. Faster shaking and more turns give a brighter flash. - [Mapping magnetic field lines of bar magnets and a current-carrying wire](https://engineergurukul.com/resources/project-ideas/magnetic-field-lines-mapping-with-compasses/): A small compass points along the magnetic field at each point, so plotting its direction step by step traces the field lines of a magnet. A wire carrying current also deflects the compass, showing that electric current p - [Joule heating: water temperature rise against voltage](https://engineergurukul.com/resources/project-ideas/joule-heating-water-temperature-rise-and-voltage/): An electric current heats a resistor, and the heat produced in a fixed time is V squared divided by R, times t. Doubling the voltage on the same coil makes it deliver four times the heat. - [Potential divider: output voltage from a pencil lead and an LDR](https://engineergurukul.com/resources/project-ideas/potential-divider-pencil-lead-and-ldr-output/): Two resistors in series share the cell’s voltage in proportion to their resistances. Replacing one with an LDR makes the output voltage change with light, which is how many sensors work. - [Force on a current carrying wire: swinging foil strip in a magnet gap](https://engineergurukul.com/resources/project-ideas/force-on-a-current-carrying-wire-swinging-foil-in-a-magnet/): A wire carrying current in a magnetic field feels a sideways push, F = B I L. Reversing the current or the magnet reverses the push, as Fleming’s left-hand rule says. - [Torch bulb V-I curve: why a hot filament is not ohmic](https://engineergurukul.com/resources/project-ideas/torch-bulb-v-i-curve-filament-resistance-rises/): A bulb’s filament gets hotter as the current rises, and a hotter metal resists more. The graph of voltage against current therefore bends and the bulb does not obey Ohm’s law. - [Convex lens focal length from a u-v graph on a metre rule bench](https://engineergurukul.com/resources/project-ideas/convex-lens-focal-length-from-a-u-v-graph/): A convex lens forms a real, inverted image on a screen at a distance that depends on where the object is. The lens formula links the two distances to the focal length, and a graph of 1/v against 1/u gives f accurately. - [Concave mirror: where the image forms and how big it is](https://engineergurukul.com/resources/project-ideas/concave-mirror-image-positions-and-magnification-table/): The size, position and nature of the image in a concave mirror change as the object moves from far away to inside the focal length. The mirror formula and magnification can be checked with real readings. - [Critical angle of water: the vanishing pin under a floating disc](https://engineergurukul.com/resources/project-ideas/critical-angle-of-water-with-a-floating-pin-disc/): Rays from an object under water that meet the surface at more than the critical angle are totally reflected and cannot leave. A disc on the surface can hide a pin completely when its radius is large enough, which gives t - [Glass slab pin method: Snell’s law from a sin i against sin r graph](https://engineergurukul.com/resources/project-ideas/glass-slab-pin-method-snells-law-sine-graph/): Light going from air into glass bends toward the normal so that sin i / sin r is a constant, the refractive index. A graph of sin i against sin r for several angles has a slope equal to that index. - [Two-lens compound microscope model with measured magnification](https://engineergurukul.com/resources/project-ideas/two-lens-compound-microscope-model-with-measured-magnification/): A short focal length objective makes a magnified real image, and a second lens, the eyepiece, magnifies that image again. The total magnification is the product of the two. - [Two-lens astronomical telescope: magnifying power equals f0 divided by fe](https://engineergurukul.com/resources/project-ideas/two-lens-astronomical-telescope-with-magnifying-power-check/): A long focal length objective and a short focal length eyepiece make a refracting telescope. In normal adjustment its angular magnification is f0 / fe. - [Inverse square law of light with an LED and a phone lux meter](https://engineergurukul.com/resources/project-ideas/inverse-square-law-of-light-led-and-phone-lux-meter/): The brightness of a small light source falls with the square of the distance. Doubling the distance cuts the light to a quarter. - [Specific heat of metal pieces by the method of mixtures](https://engineergurukul.com/resources/project-ideas/specific-heat-of-metal-pieces-by-method-of-mixtures/): Different metals need different amounts of heat to warm by one degree. Dropping hot metal into cool water and measuring the final temperature gives the metal’s specific heat. - [Butter dabs on metal rods: which metal conducts heat best](https://engineergurukul.com/resources/project-ideas/butter-dabs-on-metal-rods-comparing-heat-conduction/): When one end of equal rods is heated, the heat travels along each at a different speed. Dabs of butter melt in order along the rod, showing which metal is the better conductor. - [Echo clapping rhythm: speed of sound from a distant wall](https://engineergurukul.com/resources/project-ideas/echo-clapping-rhythm-speed-of-sound-from-a-wall/): Sound takes time to reach a wall and return. If you clap so that each clap meets the echo of the last, the time between claps is the echo time, so speed = 2 × distance ÷ time. - [Newton’s second law: trolley pulled by a falling weight](https://engineergurukul.com/resources/project-ideas/newtons-second-law-trolley-and-falling-weight-test/): The acceleration of a trolley is proportional to the force on it and inversely proportional to its mass. A falling weight pulls the trolley, and distance-time measurements give the acceleration. - [Rubber band launcher: range against launch angle, maximum at 45 degrees](https://engineergurukul.com/resources/project-ideas/rubber-band-launcher-range-against-launch-angle/): A ball launched at the same speed travels farthest when the angle is about 45 degrees, and two angles that add to 90 degrees give the same range. This follows from R = v² sin 2θ / g. - [Archimedes’ principle with an overflow can and a rubber-band balance](https://engineergurukul.com/resources/project-ideas/archimedes-principle-overflow-can-and-spring-balance/): An object put in water seems lighter by exactly the weight of the water it pushes aside. The loss of weight, measured on a balance, equals the weight of the overflowed water. - [Straw hydrometer: calibrating a float to measure liquid density](https://engineergurukul.com/resources/project-ideas/straw-hydrometer-calibrated-for-milk-and-salt-water/): A weighted straw floats lower in a lighter liquid and higher in a denser one. Marking it in liquids of known density turns it into a hydrometer. - [Finding g with a simple pendulum: T² against length graph](https://engineergurukul.com/resources/project-ideas/simple-pendulum-g-from-t-squared-against-length-graph/): The square of a pendulum’s period is proportional to its length, with slope 4π² / g. The slope of the graph gives the acceleration due to gravity at your place. - [Savonius wind turbine from cans: lifting a weight at different wind speeds](https://engineergurukul.com/resources/project-ideas/savonius-wind-turbine-lifting-a-weight-power-against-fan-speed/): A vertical-axis turbine with two curved scoops spins in a wind, and the turning axle winds up a thread to lift a weight. The useful power it delivers can be compared with the power in the wind, which is ½ ρ A v³. - [Rolled newspaper tube bridge: how much can it carry?](https://engineergurukul.com/resources/project-ideas/newspaper-tube-bridge-load-test/): A flat sheet of paper bends easily, but the same paper rolled into a tube becomes strong. The bridge shows how shape, not material, decides strength. - [Ice-cream stick truss bridge that spans 40 cm](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-truss-bridge-span/): A truss turns a downward load into pulling in some sticks and pushing in others. Triangular patterns share the load, so a light bridge can carry many times its own weight. - [CD and paper Newton colour disc that turns white when spun](https://engineergurukul.com/resources/project-ideas/cd-newton-colour-disc-spinner/): White light is a mixture of the seven spectrum colours. When a disc painted in rainbow sectors spins fast, the eye blends the colours and sees a pale white or grey. - [Shoebox spectroscope using a piece of CD as a grating](https://engineergurukul.com/resources/project-ideas/shoebox-cd-spectroscope/): A CD has fine tracks that spread light into colours by diffraction. The spectroscope shows that different bulbs and tubes have different colour patterns. - [Syringe-powered hydraulic arm from cardboard and ice-cream sticks](https://engineergurukul.com/resources/project-ideas/syringe-hydraulic-cardboard-arm/): Pushing a liquid in a closed system passes the pressure on equally in every direction, so a small push at one syringe moves the arm at another. It is the idea behind brakes and JCBs. - [Archimedes screw water lifter from a bottle and a plastic tube](https://engineergurukul.com/resources/project-ideas/bottle-and-hose-archimedes-screw-water-lifter/): Turning a spiral of tube lifts water uphill without a pump. The device is a screw that lifts water in a few turns, used for thousands of years. - [Savonius wind turbine from two halves of a plastic bottle](https://engineergurukul.com/resources/project-ideas/bottle-half-savonius-wind-turbine/): A vertical turbine with curved cups catches the wind from any direction. It shows how kinetic energy of the wind is turned into rotation. - [Pot-in-pot clay cooler: how evaporation keeps food cool](https://engineergurukul.com/resources/project-ideas/pot-in-pot-evaporative-cooler-test/): Water evaporating from wet sand between two clay pots takes heat from the inner pot. The test shows a temperature drop with no electricity. - [Cardboard gear train with a cap handle and a measured speed ratio](https://engineergurukul.com/resources/project-ideas/cardboard-gear-train-speed-ratio/): Gears change speed and turning force. A small gear driven by a large one spins faster but with less force, and the number of turns it makes for one turn of the large gear equals the ratio of their teeth. - [Straw and tape wave machine for transverse waves](https://engineergurukul.com/resources/project-ideas/straw-and-tape-wave-machine/): A disturbance can travel along a line of objects without the objects moving along. The machine shows a transverse wave with crest, trough, wavelength and speed. - [Principle of moments board from a ruler and paper-clip hooks](https://engineergurukul.com/resources/project-ideas/hanger-balance-principle-of-moments-board/): A beam stays balanced when the clockwise moment equals the anticlockwise moment. The board lets students test the rule with known weights. - [Cardboard dam model that shows why a dam is thicker at the base](https://engineergurukul.com/resources/project-ideas/cardboard-dam-model-thick-base-pressure/): Water pressure grows with depth, so the base of a dam must be thicker than the top. The model has a spillway and a sluice gate and shows how stored water gives energy. - [Newton’s cradle from marbles, thread and an ice-cream stick frame](https://engineergurukul.com/resources/project-ideas/marble-newtons-cradle-stick-frame/): When one ball hits a row of balls, the one at the far end swings out and the others stay still. This shows that momentum and energy are conserved in an elastic collision. - [Pizza box solar oven that warms a cup of water](https://engineergurukul.com/resources/project-ideas/pizza-box-solar-oven-warm-water/): Foil reflects sunlight into the box, a clear cover traps heat, and a black cup absorbs it. The test shows how reflection, absorption and trapping of heat make a solar cooker. - [Spool block and tackle that lifts a brick: counting the ropes](https://engineergurukul.com/resources/project-ideas/spool-block-and-tackle-counting-ropes/): Several rope sections supporting a load share its weight. The mechanical advantage equals the number of supporting rope sections, so you pull a longer length with less force. - [Popcorn: does soaking the kernels change how many pop?](https://engineergurukul.com/resources/project-ideas/popcorn-moisture-and-popping-rate/): Each popcorn kernel holds a tiny drop of water. When heated, the water turns to steam and builds pressure until the hard shell bursts. You test dry, lightly soaked and over-soaked kernels and count the percentage that po - [Cooking time against size: potato cubes in boiling water](https://engineergurukul.com/resources/project-ideas/potato-cube-size-and-boiling-time/): Heat moves into a potato from the outside by conduction, so a bigger piece takes much longer to cook through. By boiling cubes of different sides and noting when a fork goes in, you find the link between size and cooking - [Sugar in fruit juice estimated from density and a float test](https://engineergurukul.com/resources/project-ideas/fruit-juice-sugar-density-float-test/): The more sugar a liquid holds, the denser it is. By making a density scale from sugar water and then floating a small object in juice samples, you estimate how much sugar is in the juice compared with a cola or squash. - [Honey and oil flow: a marble drop viscosity test](https://engineergurukul.com/resources/project-ideas/honey-viscosity-marble-drop-temperature/): Viscosity is how much a liquid resists flowing, and it falls quickly as the liquid warms. Timing a marble falling through honey or oil at different temperatures lets you measure this. - [Warm water boiling in a syringe: the pressure cooker idea](https://engineergurukul.com/resources/project-ideas/syringe-boils-water-at-room-temperature/): Water boils when its vapour pressure matches the pressure around it. Pulling the plunger of a sealed syringe lowers the pressure and makes warm water bubble, which is the same relationship that makes a pressure cooker co - [Sticky tape strength: how overlap length changes the load it holds](https://engineergurukul.com/resources/project-ideas/sticky-tape-overlap-length-and-load/): The holding force of an adhesive tape is proportional to the area stuck down, so doubling the overlap should double the load it takes before peeling. You test the idea with strips and small weights and plot a graph. - [Cooling curves of hot water: lid, no lid, wide and narrow pots](https://engineergurukul.com/resources/project-ideas/hot-water-cooling-curve-lid-and-pot-shape/): A hot liquid cools by evaporation, convection and radiation, and a lid or a narrow shape cuts the losses. You record temperature every five minutes and plot cooling curves for four setups. - [How tall must a mirror be to see your whole body?](https://engineergurukul.com/resources/project-ideas/bathroom-mirror-height-to-see-full-self/): To see your whole body in a flat mirror, the mirror need be only half as tall as you, and it does not depend on how far you stand. You test this with a small mirror, a tape and a friend. - [Water siphon from a kitchen tube: height difference and flow rate](https://engineergurukul.com/resources/project-ideas/kitchen-tubing-water-siphon-height-and-flow/): A siphon moves water up and over a barrier without a pump, because the longer falling column of water pulls the liquid along. You measure how the height difference between two buckets changes the flow rate. - [Which surface colour heats up fastest in the sun? Four can test](https://engineergurukul.com/resources/project-ideas/surface-colour-and-sunlight-heating-cans/): Dark and dull surfaces absorb more sunlight than light and shiny ones. The temperature rise of equal cans of water under the same sun shows which colour is best for a solar heater and which suits a roof. - [How many clear layers does a solar heater plate need? Glazing test](https://engineergurukul.com/resources/project-ideas/glass-layers-on-a-solar-collector-test/): A clear cover over a black plate lets sunlight in and slows heat from escaping. Testing zero, one and two layers shows the benefit and the point where extra layers stop helping. - [Vertical Savonius turbine from two halves of a plastic bottle](https://engineergurukul.com/resources/project-ideas/savonius-bottle-wind-turbine-spins-in-a-fan-breeze/): A vertical-axis wind turbine spins whichever way the wind blows. The curved half-bottle blades catch more push on the open side than the round side, so the rotor keeps turning. - [Two, three, four or six blades: which rotor turns a dynamo best?](https://engineergurukul.com/resources/project-ideas/blade-number-and-pitch-wind-rotor-comparison/): The number and angle of blades change how much electricity a small wind rotor makes. Measuring voltage for each design under the same fan shows the best design for a fixed wind speed. - [Overshot against undershot water wheel lifting the same load](https://engineergurukul.com/resources/project-ideas/overshot-against-undershot-water-wheel-test/): Water can turn a wheel by weight from above (overshot) or by push from below (undershot). Timing how fast each wheel lifts a small weight shows which uses water more efficiently. - [Hand-crank generator: voltage against cranking speed](https://engineergurukul.com/resources/project-ideas/hand-crank-generator-lights-an-led-from-a-toy-motor/): Turning a small DC motor by hand makes a voltage, so the motor acts as a generator. Faster cranking gives higher voltage and brighter light, showing that mechanical energy changes into electrical energy. - [Small solar cells in series and in parallel, with one cell shaded](https://engineergurukul.com/resources/project-ideas/solar-cells-in-series-and-parallel-with-partial-shade/): Joining cells in series adds voltage, while joining them in parallel adds current. Shading one cell shows why a single shaded cell can cut the power of a whole panel. - [Pot-in-pot clay cooler that keeps vegetables fresh without electricity](https://engineergurukul.com/resources/project-ideas/zeer-pot-clay-pot-in-pot-cooler-for-vegetables/): Water evaporating from wet sand between two clay pots cools the inner pot. This is how farmers can store vegetables cooler without a fridge. - [Windmill pump model that lifts water with a crank and syringe](https://engineergurukul.com/resources/project-ideas/windmill-water-pump-model-lifts-water-with-bottle-blades/): A windmill pump turns the spin of its blades into an up and down stroke that lifts water. It shows how farmers use wind to irrigate fields with no electricity. - [Sprinkler irrigation model from a drilled pipe and a bucket head](https://engineergurukul.com/resources/project-ideas/sprinkler-irrigation-model-from-a-drilled-pipe/): A rotating or fixed sprinkler spreads water as small jets over a field. The model shows how water pressure, hole size and height decide how far and how evenly water falls. - [Drip emitter flow against reservoir height: pressure head test](https://engineergurukul.com/resources/project-ideas/drip-emitter-flow-against-reservoir-height/): The rate at which a drip emitter releases water depends on the height of the water above it. Measuring drops per minute at different heights shows the link between pressure and flow, which a farmer uses to design a drip - [Gravity dam profile model: why the base is thick and the top thin](https://engineergurukul.com/resources/project-ideas/gravity-dam-profile-model-thrust-and-stability/): Water pressure grows with depth, so dams are thicker at the bottom. A model dam in a tray of water shows that a trapezoid profile resists the push of water better than a thin wall. - [Canal lock model that lifts a boat between two water levels](https://engineergurukul.com/resources/project-ideas/canal-lock-model-lifts-a-paper-boat-between-levels/): A lock raises or lowers boats by letting water in or out of a chamber between gates. The model shows how water finds its own level and moves a boat with no engine lift. - [Archimedes screw water lifter from a bottle and a coil of tube](https://engineergurukul.com/resources/project-ideas/archimedes-screw-water-lifter-from-a-bottle-and-tube/): A screw turning in a tilted tube lifts water upward, an idea used for thousands of years to irrigate fields. The model shows how a simple machine moves water uphill without a motor. - [Hand pump model from a bottle, tube and two one-way flaps](https://engineergurukul.com/resources/project-ideas/bottle-hand-pump-model-with-two-one-way-flaps/): A hand pump uses a piston and one-way valves to lift water from a well. The model shows how pushing and pulling the handle makes water move in one direction. - [Two-lens refracting telescope from a pair of magnifying glasses](https://engineergurukul.com/resources/project-ideas/two-lens-refracting-telescope/): A long-focus lens gathers light from a distant object and forms a small image. A second short-focus lens acts as a magnifier for that image, so far-away objects look larger and nearer. - [Whirling ball orbit: how speed changes with string length](https://engineergurukul.com/resources/project-ideas/whirling-ball-orbit-speed-radius/): A ball on a string moving in a circle needs a steady inward pull. This pull mimics gravity for a satellite. For the same pull, a longer string needs a faster ball, while real planets nearer the Sun move faster because gr - [CD spectroscope that splits daylight, bulb and tube light](https://engineergurukul.com/resources/project-ideas/cd-spectroscope-sun-lamp-spectra/): A CD acts as a diffraction grating, splitting light into colours. Different sources give different patterns of colour, and astronomers use the same idea to find what stars are made of. - [Gaganyaan-style crew capsule with a parachute to land an egg astronaut](https://engineergurukul.com/resources/project-ideas/gaganyaan-capsule-parachute-egg-drop/): A crew capsule coming back from space is slowed by a parachute and lands softly. A larger parachute canopy gives more air drag and a slower fall, which protects the passenger. - [Bounce height of cricket, tennis and rubber balls on grass, concrete and sand](https://engineergurukul.com/resources/project-ideas/ball-bounce-cricket-tennis-rubber-surfaces/): How high a ball bounces depends on both the ball and the surface. Some of the ball’s energy is lost as sound, heat and a dent in the surface at each bounce, which explains why pitches matter in cricket. - [Launch angle and range with a spring catapult: is 45 degrees best?](https://engineergurukul.com/resources/project-ideas/launch-angle-range-spring-catapult/): The range of a projectile depends on the launch angle. On level ground and with little air drag, the greatest range occurs at 45 degrees, and complementary angles such as 30 and 60 degrees give the same range. - [Flat sole, studs and spikes: friction on a muddy tray](https://engineergurukul.com/resources/project-ideas/studs-flat-sole-spikes-muddy-tray-friction/): Friction is the force that stops a shoe from slipping. On wet mud, the grip depends on the sole pattern, because studs and spikes dig in and rubber flat soles slide on a film of water. - [Ruler-drop reaction time: dominant hand, other hand and a warning sound](https://engineergurukul.com/resources/project-ideas/ruler-drop-reaction-time-dominant-hand/): The distance a ruler falls before you catch it tells how fast you react. Comparing hands and signals shows what can speed up or slow down a response, which is important in cricket and sprint starts. - [Kite flying physics: tail length, string angle and wind speed](https://engineergurukul.com/resources/project-ideas/kite-flying-physics-tail-angle-wind/): A kite stays up because the wind pushes on it at an angle. The forces of wind, weight and string tension balance. A longer tail steadies the kite, and a higher wind speed raises the string angle. - [Balance point of a cricket bat, a hockey stick and a broom handle](https://engineergurukul.com/resources/project-ideas/bat-and-hockey-stick-balance-point/): Every object has a balance point, the centre of gravity, where its weight seems to act. In sports equipment it is not at the middle, and where it lies changes how the object feels in the hand. - [Spinning paper-cup curve: the Magnus effect in spin bowling](https://engineergurukul.com/resources/project-ideas/spinning-cup-magnus-curve-ball/): A spinning object moving through the air curves sideways. A spinning paper-cup spool launched by unwinding a rubber band or thread shows a curved flight, as a spinning cricket ball or football does. - [Standing long jump: does an arm swing add distance?](https://engineergurukul.com/resources/project-ideas/standing-long-jump-arm-swing-data/): The distance of a jump depends on the take-off speed and angle. Swinging the arms adds to the speed of the body’s launch, which is why athletes use them. - [Playground swing as a pendulum: does the rider’s weight change the time?](https://engineergurukul.com/resources/project-ideas/playground-swing-pendulum-timing/): The time of a swing depends on its length and not on how heavy the rider is. A small model pendulum and a real swing both give a period close to 2 times pi times the square root of length over g. - [30 metre sprint speeds of a class timed with a pair of stopwatches](https://engineergurukul.com/resources/project-ideas/sprint-30m-timing-gate-class-speeds/): Average speed equals distance divided by time. Timing a short run shows differences in speed in a class, and also how reaction time of the timekeeper can add error. - [Football air pressure and bounce height with a hand pump](https://engineergurukul.com/resources/project-ideas/football-air-pressure-and-bounce-height/): The more air pressure inside a ball, the harder it is and the higher it bounces. A ball that is too soft loses a lot of energy because it squashes more on impact. - [Playground seesaw: where must two children sit to balance?](https://engineergurukul.com/resources/project-ideas/playground-seesaw-where-children-sit-balance/): A seesaw balances when the turning effect (moment) on one side equals that on the other. A lighter child must sit farther from the pivot to balance a heavier child. - [Carrom striker slide: how powder changes friction and stopping distance](https://engineergurukul.com/resources/project-ideas/carrom-striker-powder-friction-slide/): Carrom players sprinkle fine powder on the board to make the striker glide. Measuring how far a striker slides with and without powder shows how a thin layer lowers friction. - [Baking-tray ripple tank: reflection and refraction of water waves](https://engineergurukul.com/resources/project-ideas/baking-tray-ripple-tank-reflection-refraction/): A shallow tray of water lit from above shows ripples as bright and dark lines on white paper below. Ripples reflect from a barrier and bend when they pass from deep to shallow water, because waves travel more slowly in s - [Speed of sound from an echo: clapping in time with a wall](https://engineergurukul.com/resources/project-ideas/speed-of-sound-by-clapping-in-time-with-echo/): If you stand about 50 m from a large wall and clap so that each clap meets the echo of the one before, the time between claps equals the time sound takes for the round trip. The distance and time give the speed of sound - [Blowing over a tube: pitch against air column length](https://engineergurukul.com/resources/project-ideas/blown-air-column-resonance-pitch-and-length/): A tube with its lower end in water gives a note when you blow across the open top, and a shorter air column gives a higher pitch. The frequency is roughly inversely proportional to the length of the air column. - [Electrophorus: charging a foil plate again and again by induction](https://engineergurukul.com/resources/project-ideas/electrophorus-foil-plate-charge-by-induction/): A foil plate with an insulating handle can be charged over and over from one rubbed plastic sheet without losing the sheet’s charge. It shows charging by induction and earthing, and the plate can make a small spark in a - [Latent heat of melting ice measured by mixing ice with warm water](https://engineergurukul.com/resources/project-ideas/latent-heat-of-ice-by-mixing-with-warm-water/): Ice at 0 °C takes a large amount of heat to melt, without any rise in temperature. Mixing a known mass of ice into warm water and noting the final temperature lets us calculate this latent heat as about 334 joules per gr - [Cooling curve of hot water in a bare cup, a lidded cup and a wrapped cup](https://engineergurukul.com/resources/project-ideas/cooling-curve-of-hot-water-three-cups/): Hot water cools quickly at first and slowly later, because the rate of heat loss depends on how much hotter the water is than the room. A graph of temperature against time for three cups shows how a lid and a wrapping re ### Chemistry, Class 9 and 10 - [Red cabbage indicator](https://engineergurukul.com/resources/project-ideas/red-cabbage-indicator/): Red cabbage juice changes colour with acids and bases: pink or red in acids, purple when neutral, and blue, green or yellow in bases. - [Lemon and potato battery](https://engineergurukul.com/resources/project-ideas/fruit-battery/): Two different metals in an acidic juice make an electric cell, turning chemical energy into electrical energy. One lemon gives less than one volt, so several are joined in series (the copper of one to the zinc of the nex - [What makes iron rust?](https://engineergurukul.com/resources/project-ideas/what-makes-iron-rust/): Iron rusts only when both air (oxygen) and water are present, and salt water speeds it up. Nails kept dry, or in boiled water sealed with a layer of oil, stay bright. - [Paper chromatography of inks](https://engineergurukul.com/resources/project-ideas/ink-chromatography/): Many inks are mixtures of colours. As water climbs the paper, each colour travels a different distance, depending on how well it dissolves and how strongly it sticks to the paper. - [Electrolysis of water](https://engineergurukul.com/resources/project-ideas/electrolysis-of-water/): An electric current splits water into hydrogen at the negative electrode and oxygen at the positive one. About twice as much hydrogen as oxygen collects, which matches the formula H₂O. - [pH of household substances](https://engineergurukul.com/resources/project-ideas/ph-of-household-substances/): pH measures how acidic or basic a solution is on a scale from 0 to 14, with 7 neutral. Universal indicator or pH paper shows the value by its colour. - [Temperature and the rate of a reaction](https://engineergurukul.com/resources/project-ideas/reaction-rate-temperature/): An effervescent tablet dissolves faster in warm water, because the particles move faster and collide more often and with more energy. Crushing the tablet speeds it up too, by giving it more surface area. - [Simple food adulteration tests](https://engineergurukul.com/resources/project-ideas/food-adulteration-tests/): Some adulterants show up with simple tests: starch in milk, paneer or khoa turns blue-black when iodine is added to the boiled and cooled sample, and sawdust or brick powder in spices floats or settles when the powder is - [Comparing water hardness of local samples by soap drop count](https://engineergurukul.com/resources/project-ideas/water-hardness-soap-drop-count-of-local-samples/): Hard water contains dissolved calcium and magnesium salts that react with soap to form scum before any lather can form. Counting the drops of a standard soap solution needed to get a lasting lather ranks tap, borewell, R - [Testing milk for added water, starch and detergent](https://engineergurukul.com/resources/project-ideas/milk-adulteration-water-starch-detergent-tests/): Three quick tests catch the commonest milk adulterants: a drop on a tilted plate flows slowly for pure milk but runs fast if watered, iodine turns blue if starch was added to thicken it, and shaking with water gives a th - [Is the honey pure? Kitchen tests against sugar syrup](https://engineergurukul.com/resources/project-ideas/honey-purity-kitchen-tests-against-sugar-syrup/): Pure honey is a very concentrated sugar solution with little free water, so it behaves differently from honey diluted with sugar syrup: it sinks as a lump in water instead of spreading, is not soaked into blotting paper, - [Rate of reaction and surface area: whole, halved and crushed tablets](https://engineergurukul.com/resources/project-ideas/reaction-rate-surface-area-crushed-vs-whole-tablet/): An effervescent tablet fizzes in water as its citric acid and bicarbonate react. The same tablet crushed to powder finishes in a fraction of the time, because the reaction happens only at the solid surface and powder has - [Rate of reaction and concentration: vinegar strength by mass loss](https://engineergurukul.com/resources/project-ideas/reaction-rate-vinegar-concentration-mass-loss/): When baking soda reacts with vinegar, the carbon dioxide escapes and the flask gets lighter. Following the mass on a balance every 15 to 30 seconds gives a rate curve, and repeating with diluted vinegar shows that the ra - [Electroplating a steel key with copper from copper sulphate](https://engineergurukul.com/resources/project-ideas/copper-electroplating-a-key-with-copper-sulphate/): Passing a small current through copper sulphate solution deposits a layer of copper on the object connected to the negative terminal, while the copper anode slowly dissolves to replace the copper ions. A clean steel key - [Which cold drink is most acidic? Baking soda drop count](https://engineergurukul.com/resources/project-ideas/acidity-of-cold-drinks-by-baking-soda-drop-count/): Fizzy drinks and juices contain phosphoric, citric and carbonic acids. Counting the drops of a fixed baking soda solution needed to neutralise a measured volume of each drink, watched with a natural indicator, ranks them - [pH of tea and coffee against brewing time and added milk](https://engineergurukul.com/resources/project-ideas/ph-of-tea-and-coffee-against-brewing-time/): Tea and coffee are mildly acidic, and the acidity depends on how long they brew and whether milk is added. Measuring pH with indicator paper for black tea, green tea and coffee brewed for different times shows how extrac - [Corrosion rate of iron nails against salt concentration](https://engineergurukul.com/resources/project-ideas/corrosion-rate-of-iron-nails-vs-salt-concentration/): Rusting is an electrochemical process that speeds up when the water conducts better. Nails kept in water with 0, 1, 3.5 and 10 percent salt for two weeks, then cleaned and weighed, show that salt accelerates corrosion, w - [Comparing vinegar brands by drop titration with washing soda](https://engineergurukul.com/resources/project-ideas/vinegar-brand-strength-by-washing-soda-drop-titration/): The acetic acid content of vinegar can be compared by titrating a measured volume with a standard washing soda solution until an indicator changes colour. Running three brands and a home-made dilution ranks them by stren - [Which antacid neutralises the most acid? A vinegar drop count](https://engineergurukul.com/resources/project-ideas/antacid-tablets-neutralising-power-comparison/): Antacids are bases or salts of weak acids that react with acid and neutralise it. Counting how many drops of vinegar one tablet can neutralise lets you compare brands fairly, per tablet and per gram. - [How much calcium carbonate is in an eggshell? Mass loss in vinegar](https://engineergurukul.com/resources/project-ideas/calcium-carbonate-percentage-in-eggshell/): Eggshell is mostly calcium carbonate. When it reacts with vinegar it gives off carbon dioxide, so the loss in mass of the flask tells you how much calcium carbonate was present. - [Hot or cold? Temperature change when different solids dissolve](https://engineergurukul.com/resources/project-ideas/heat-change-when-solids-dissolve/): Dissolving some solids makes the water colder (endothermic) and dissolving others makes it warmer (exothermic). The reason is the balance between the energy needed to break the solid apart and the energy released as wate - [Iron nail in copper sulphate: weighing the copper that appears](https://engineergurukul.com/resources/project-ideas/iron-nail-copper-sulphate-displacement-mass/): A more reactive metal pushes a less reactive metal out of its salt solution. Iron displaces copper from copper sulphate, and the mass of copper formed can be compared with the mass of iron used. - [Cooling curve of candle wax: where the temperature stops falling](https://engineergurukul.com/resources/project-ideas/candle-wax-cooling-curve-plateau/): When liquid wax freezes it gives out latent heat, so the temperature stays nearly steady while it solidifies. The flat part of the cooling curve marks the freezing point. - [Does salt raise the boiling point of water? A measured test](https://engineergurukul.com/resources/project-ideas/boiling-point-rise-with-salt/): A dissolved solid raises the boiling point of water, and the rise grows with the amount of solute. This is called boiling point elevation and is a colligative property. - [Charles’s law with a sealed syringe in cold and hot water baths](https://engineergurukul.com/resources/project-ideas/charles-law-syringe-water-baths/): A fixed amount of gas at constant pressure expands steadily as its temperature rises. A graph of volume against temperature is a straight line that points to about minus 273 degrees C. - [Catalyst race: which kitchen catalyst breaks down hydrogen peroxide fastest?](https://engineergurukul.com/resources/project-ideas/hydrogen-peroxide-catalyst-race-yeast-potato/): Catalysts speed up a reaction without being used up. Yeast and raw potato contain catalase, an enzyme that breaks hydrogen peroxide into water and oxygen, and the volume of oxygen collected measures how fast it works. - [Dyeing cotton with turmeric and onion skin: does a mordant help?](https://engineergurukul.com/resources/project-ideas/natural-dye-mordant-cotton-colourfastness/): Many natural dyes wash out of cotton unless a mordant is used. A mordant such as alum forms a link between the dye and the fibre, making the colour stronger and more lasting. - [Spinach leaf pigments separated by paper chromatography with Rf values](https://engineergurukul.com/resources/project-ideas/leaf-pigments-paper-chromatography-rubbing-alcohol/): A green leaf contains several pigments. Paper chromatography separates them because they travel up the paper at different speeds, and the ratio of distances, the Rf value, identifies each one. - [Bohr atom models for the first ten elements with beads and wire](https://engineergurukul.com/resources/project-ideas/thermocol-bohr-atom-model-beads-wire/): Electrons fill shells around the nucleus in order: two in the first shell and up to eight in the second. The models show how this explains the valency of the first ten elements. - [Ball and stick molecules of water, CO2 and methane from clay and sticks](https://engineergurukul.com/resources/project-ideas/egg-tray-ball-and-stick-molecules/): Atoms join to form molecules in fixed shapes. Water is bent, carbon dioxide is straight and methane is a tetrahedron, which affects their properties. - [Periodic table wall chart of the first 20 elements with shell cups](https://engineergurukul.com/resources/project-ideas/periodic-table-chart-first-twenty-elements/): Elements in the same column have the same number of outer electrons and similar properties. The chart shows the pattern of metals, non-metals and noble gases. - [Does salt or sugar change the boiling point of water?](https://engineergurukul.com/resources/project-ideas/boiling-point-of-water-with-salt-and-sugar/): Dissolved salt or sugar raises the boiling point of water by a small amount that grows with the number of dissolved particles. You measure the rise with a thermometer and compare it with the tiny amount people imagine wh - [Why fresh pineapple stops jelly from setting](https://engineergurukul.com/resources/project-ideas/jelly-setting-pineapple-fresh-against-tinned/): Jelly sets because gelatin proteins link into a net, but fresh pineapple contains an enzyme, bromelain, that cuts proteins and stops the net forming. Heated or tinned pineapple has lost the enzyme, so the jelly sets norm - [Hard water scale: which kitchen acid dissolves it best?](https://engineergurukul.com/resources/project-ideas/kettle-scale-removal-vinegar-lemon-citric/): Hard water leaves chalky scale of calcium carbonate that dissolves in acids and gives off carbon dioxide. You compare vinegar, lemon juice and citric acid solution on chalk as a model of scale and measure the mass lost. - [Are all steel utensils magnetic? Testing a kitchen full of metals](https://engineergurukul.com/resources/project-ideas/are-steel-utensils-magnetic-stainless-grades/): Plain iron and some kinds of steel are attracted by a magnet, but many stainless steels with nickel are not, or only slightly. By testing kitchen items you learn why steel types differ and how to sort the metals around y - [pH of garden, farm and roadside soil using red cabbage indicator](https://engineergurukul.com/resources/project-ideas/ph-of-garden-farm-and-roadside-soil-with-cabbage-indicator/): Soils can be acidic, neutral or alkaline, and crops grow best in a suitable range. A homemade indicator sorts soils from different places by colour. - [Alum against moringa seed powder: which clears muddy water faster?](https://engineergurukul.com/resources/project-ideas/alum-against-moringa-seed-powder-clears-muddy-water/): Coagulants make tiny suspended particles clump together and sink. Comparing alum (phitkari) with crushed moringa seed shows two ways to clear turbid water before filtering. - [Steel wool in a jar: how much of the air is oxygen?](https://engineergurukul.com/resources/project-ideas/steel-wool-oxygen-in-air-one-fifth/): Steel wool rusts by using up the oxygen in a closed jar, so water rises in the jar to take the place of the oxygen. The water rises by about one fifth of the air column, showing that air is about 21 percent oxygen. - [Homemade cold pack: temperature drop when citric acid meets baking soda](https://engineergurukul.com/resources/project-ideas/cold-pack-citric-acid-baking-soda-temperature-drop/): When citric acid and baking soda dissolve and react in water, the mixture gets colder, which shows an endothermic change that takes heat from the surroundings. It is the opposite of burning, which gives heat out. - [Solubility against temperature: kitchen salt compared with alum](https://engineergurukul.com/resources/project-ideas/solubility-salt-and-alum-against-temperature/): The amount of a solid that dissolves in 100 ml of water changes with temperature, but differently for each solid. Alum dissolves several times more at 60 °C than at room temperature, while salt barely changes. - [Limewater from chuna: is there more carbon dioxide in the breath we blow out?](https://engineergurukul.com/resources/project-ideas/limewater-test-for-carbon-dioxide-in-breath/): Limewater turns milky when carbon dioxide passes through it, because insoluble calcium carbonate forms. Breath blown out turns it milky faster than ordinary air does, which shows that exhaled air has more carbon dioxide. - [Bringing back tarnished silver with aluminium foil and baking soda](https://engineergurukul.com/resources/project-ideas/tarnished-silver-cleaned-with-foil-and-baking-soda/): Black tarnish on silver is silver sulphide, and it can be turned back to shiny silver without scrubbing, using aluminium foil, baking soda and hot water. It is a small electrochemical cell in which aluminium is more reac - [Yeast as a catalyst: foam height from 3 percent hydrogen peroxide](https://engineergurukul.com/resources/project-ideas/yeast-catalyst-hydrogen-peroxide-foam-height/): Hydrogen peroxide breaks down very slowly on its own but very fast when yeast is present. Yeast contains the enzyme catalase, a catalyst, and the oxygen released makes a tall foam with a little dish soap. - [Tyndall torch beam: telling solutions from colloids and suspensions](https://engineergurukul.com/resources/project-ideas/tyndall-torch-beam-solutions-and-colloids/): A torch beam is invisible in clear salt water but shows up as a bright path in dilute milk or starch water. The particles of a colloid are big enough to scatter light, and those of a true solution are not. ### Biology, Class 9 and 10 - [Human digestive system model](https://engineergurukul.com/resources/project-ideas/digestive-system/): Food travels from the mouth down the food pipe to the stomach, the small intestine and the large intestine. The liver and pancreas add juices that help digestion. - [Working lungs model](https://engineergurukul.com/resources/project-ideas/lungs-model/): Pulling the diaphragm (the stretched balloon) down makes more space in the chest, the air pressure inside drops, and air rushes into the lungs. Pushing it back up pushes the air out. - [Human heart model with double circulation](https://engineergurukul.com/resources/project-ideas/human-heart-model/): The heart has four chambers. The right side pumps blood to the lungs to pick up oxygen, and the left side pumps it to the rest of the body. Valves stop the blood flowing backwards. - [Plant and animal cell models](https://engineergurukul.com/resources/project-ideas/plant-and-animal-cells/): Both cells have a nucleus, cytoplasm and a cell membrane. Plant cells also have a cell wall, chloroplasts and a large vacuole. - [DNA double helix model](https://engineergurukul.com/resources/project-ideas/dna-double-helix/): DNA is two strands twisted into a double helix. The sides are sugar and phosphate; the rungs are pairs of bases, with A always joined to T and G to C. - [Reflex arc model](https://engineergurukul.com/resources/project-ideas/reflex-arc/): In a reflex, such as pulling your hand away from something hot, the message travels from the receptor to the spinal cord and straight back to the muscle, before the brain has time to think. - [Does the colour of light affect plant growth?](https://engineergurukul.com/resources/project-ideas/light-colour-and-plant-growth/): Chlorophyll absorbs red and blue light strongly and reflects most green light, so seedlings under green filters usually grow more weakly than those in white light. - [Yeast fermentation and temperature](https://engineergurukul.com/resources/project-ideas/yeast-fermentation/): Yeast feeds on sugar and gives off carbon dioxide gas, which inflates a balloon fastest in warm water. Cold slows the yeast down and very hot water kills it. - [Osmosis in potato strips](https://engineergurukul.com/resources/project-ideas/osmosis-in-potato/): Water moves through cell membranes from a weaker solution to a stronger one (osmosis). Potato strips in strong salt or sugar water lose water and shrink; strips in plain water take in water and firm up. - [Extract DNA from a banana](https://engineergurukul.com/resources/project-ideas/dna-from-a-banana/): Washing-up liquid breaks open the cell membranes, salt helps the DNA clump together, and ice-cold alcohol makes the DNA come out of solution as white strands you can see. - [Foil on a leaf: where does the plant store starch?](https://engineergurukul.com/resources/project-ideas/foil-covered-leaf-starch-iodine-test/): A leaf partly covered with foil for two days and then tested with iodine turns blue-black only where light reached it. Leaves make starch by photosynthesis, and photosynthesis needs light. - [Tall cup and short cup: does root room change growth?](https://engineergurukul.com/resources/project-ideas/tall-and-short-cups-root-room-for-bean-plants/): The depth and amount of soil limit how far roots can spread. Growing the same bean in a tall cup and a short cup shows how room for roots affects the plant above ground. - [Counting oxygen bubbles from Hydrilla at different light distances](https://engineergurukul.com/resources/project-ideas/hydrilla-oxygen-bubbles-light-distance/): A water plant in bright light gives off bubbles of oxygen, because it is making food by photosynthesis. The closer the lamp, the faster the bubbles stream, until another factor limits the rate. - [Spinach leaf pigments separated on filter paper](https://engineergurukul.com/resources/project-ideas/spinach-leaf-pigments-paper-chromatography/): The green colour of a leaf is a mixture of several pigments. When the extract climbs a strip of paper, the pigments travel different distances and show as bands of green, yellow and orange. - [Detached leaves left on a tray: which type loses weight fastest?](https://engineergurukul.com/resources/project-ideas/detached-leaves-weight-loss-by-leaf-type/): Leaves lose water to the air, mostly through their stomata. Weighing different leaf types over two days shows how leaf structure affects water loss. - [Rhoeo leaf peel: counting stomata and guard cells](https://engineergurukul.com/resources/project-ideas/rhoeo-leaf-peel-stomata-count/): The lower surface of many leaves is dotted with tiny pores called stomata, each between two bean-shaped guard cells. Counting them under a microscope shows where a leaf exchanges gases and water vapour. - [Ear model with a funnel and balloon eardrum and dancing salt](https://engineergurukul.com/resources/project-ideas/ear-model-funnel-balloon-eardrum-dancing-salt/): Sound is collected by the outer ear and makes the eardrum vibrate. A balloon stretched over a tube acts as the eardrum, and grains of salt dance on it when you speak into the funnel. - [Shoebox eye model with a lens that shows an upside-down image](https://engineergurukul.com/resources/project-ideas/shoebox-eye-model-lens-upside-down-image/): The eye works like a camera. A lens at the front focuses light from the world onto a screen at the back, giving a small image that is upside down. - [Is there a tongue map? Testing sweet, salt, sour and bitter](https://engineergurukul.com/resources/project-ideas/tongue-taste-zones-myth-test-with-cotton-buds/): The old school picture of a tongue with separate zones for each taste is a myth. Testing tastes on different parts of the tongue shows that every part can detect all the basic tastes. - [Two-point touch test on fingertip, palm and forearm](https://engineergurukul.com/resources/project-ideas/two-point-touch-test-fingertip-palm-forearm/): Our skin is not equally sensitive everywhere. The smallest gap at which a person feels two points instead of one shows where touch receptors are packed more closely. - [Ruler-drop reaction time: does practice or distraction change it?](https://engineergurukul.com/resources/project-ideas/ruler-drop-reaction-time-practice-and-distraction/): A dropped ruler measures how fast your nerves and muscles respond. How far the ruler falls before you catch it gives your reaction time, and you can test how practice or a second task changes it. - [Lung volumes measured by water displacement in a bottle](https://engineergurukul.com/resources/project-ideas/lung-capacity-bottle-displacement-breath-volumes/): The air you breathe out can be measured by the water it pushes out of an upturned bottle. It gives your tidal volume and your vital capacity, and shows how they compare between people. - [Pulse rate before and after exercise: a recovery graph](https://engineergurukul.com/resources/project-ideas/pulse-rate-exercise-and-recovery-graph/): Muscles in exercise need more oxygen and glucose, so the heart beats faster. The time that the pulse takes to come back to normal shows how quickly the body recovers. - [Kidney filtration model with a strainer, cloth and funnel](https://engineergurukul.com/resources/project-ideas/kidney-filtration-model-strainer-cloth-and-funnel/): The kidney filters blood: small molecules such as water, salt and sugar pass out, while blood cells and large proteins are held back. A layered funnel shows the filtering idea step by step. - [Vein valve model: how muscle squeezes push blood one way](https://engineergurukul.com/resources/project-ideas/vein-valve-model-one-way-flow-with-muscle-squeeze/): Veins have valves that let blood flow only towards the heart. A tube with a one-way valve and a squeezing hand shows how muscles help push blood back up the legs. - [Villi and surface area: flat cloth against a looped towel](https://engineergurukul.com/resources/project-ideas/villi-towel-surface-area-absorption-test/): The inside of the small intestine is covered with finger-like villi that give it a very large surface area for absorbing food. A looped towel soaks up much more water than a flat cloth of the same size, just as a villus- - [Fat spot test on brown paper: nuts, snacks, fruit and sweets](https://engineergurukul.com/resources/project-ideas/fat-spot-test-brown-paper-nuts-snacks-fruit/): Foods that contain fat leave a see-through greasy mark on brown paper that does not dry away. A quick rub test sorts foods into those with fat and those without. - [Salt and yeast: how much does salt slow a rising dough?](https://engineergurukul.com/resources/project-ideas/salt-and-yeast-dough-rise-in-a-glass/): Yeast makes dough rise by fermenting sugar and giving off carbon dioxide. Adding more salt to the dough slows the yeast, so the dough rises less. - [Banana ripening in bags: does a ripe fruit speed it up?](https://engineergurukul.com/resources/project-ideas/banana-ripening-bag-with-ripe-fruit-ethylene/): Ripening fruits release a gas called ethylene that makes nearby fruit ripen faster. Green bananas sealed with a ripe fruit ripen sooner than bananas left on their own. - [Idli batter rise diary: a warm corner against a cool corner](https://engineergurukul.com/resources/project-ideas/idli-dosa-batter-rise-diary-warm-and-cool/): Rice and urad dal batter swells and turns sour overnight because tiny microbes in it make gas and acid. The rise is faster in a warm place than in a cool one. - [Curd setting time at three temperatures](https://engineergurukul.com/resources/project-ideas/curd-setting-time-at-three-temperatures/): Milk turns into curd because friendly bacteria in a spoon of old curd turn milk sugar into lactic acid. Keeping the milk at different temperatures shows how heat changes the speed of this change. - [Closed bottle garden that recycles its own water](https://engineergurukul.com/resources/project-ideas/closed-bottle-garden-water-cycle-and-gas-balance/): A sealed jar with soil and plants keeps its own small water cycle. Water evaporates from the soil and leaves, condenses on the glass and runs back, while plants and soil life swap oxygen and carbon dioxide. - [Flower visitor watch: counting pollinator visits by colour and time of day](https://engineergurukul.com/resources/project-ideas/flower-visitor-watch-pollinator-count-by-colour-and-time/): Many flowers depend on insects, birds or bats to move pollen so they can make fruit. Counting visitors on two kinds of flower at different times of day shows which flowers and hours are busiest. - [Compost bucket temperature log: green waste against a green and brown mix](https://engineergurukul.com/resources/project-ideas/compost-bucket-temperature-log-green-and-brown-mix/): Microbes in a compost heap give off heat as they break down waste. A balanced mix of green and brown material, kept moist and aerated, warms up more than green waste alone. - [Leaf litter in mesh bags: which leaves rot fastest in soil?](https://engineergurukul.com/resources/project-ideas/leaf-litter-mesh-bags-which-leaves-rot-fastest/): Fallen leaves are broken down by fungi, bacteria and soil animals. Burying equal weights of different leaves in mesh bags and weighing them later shows which kinds decompose faster. - [Root nodules on a pulse plant: tiny nitrogen factories](https://engineergurukul.com/resources/project-ideas/root-nodules-of-a-pulse-plant-nitrogen-fixers/): The roots of pulse plants such as gram, pea and groundnut carry small lumps called nodules in which bacteria fix nitrogen from the air. That is why pulses are rotated with cereals to keep soil fertile. - [Onion peel slide: cell wall, nucleus and the size of one cell](https://engineergurukul.com/resources/project-ideas/onion-peel-slide-cell-wall-nucleus-and-size/): The thin skin of an onion layer is a sheet of box-like plant cells. A stained slide under the microscope shows the cell wall and the nucleus, and a simple trick lets you estimate how big each cell is. - [Catalase in potato: raw, boiled and crushed pieces make different foam](https://engineergurukul.com/resources/project-ideas/catalase-in-potato-raw-boiled-and-crushed-foam-height/): Living cells make an enzyme, catalase, that breaks hydrogen peroxide into water and oxygen. Raw potato foams strongly when added to dilute peroxide, boiled potato hardly foams, and crushed potato foams fastest. - [Fresh and tinned pineapple in jelly: an enzyme that eats protein](https://engineergurukul.com/resources/project-ideas/fresh-and-tinned-pineapple-in-jelly-protein-enzyme-test/): Fresh pineapple contains bromelain, an enzyme that breaks down proteins, so it stops gelatin jelly from setting. Tinned or boiled pineapple, whose enzyme has been destroyed by heat, lets the jelly set normally. - [Mendel with coins: tossing a pea cross to find the 3 to 1 ratio](https://engineergurukul.com/resources/project-ideas/mendel-coin-toss-pea-cross-3-to-1-ratio/): When two hybrid tall pea plants are crossed, each offspring gets one gene copy from each parent at random. Tossing two coins 100 times copies this and shows the 1 to 2 to 1 genotype and 3 to 1 appearance ratios. - [Kidney filter model with sand, gravel and cotton in a bottle](https://engineergurukul.com/resources/project-ideas/bottle-layers-kidney-filter-model/): The kidney filters blood: large particles stay in, and water, salts and urea leave as urine. The layered bottle shows filtering by particle size. - [Blood circulation model with a squeeze-bottle heart and coloured water](https://engineergurukul.com/resources/project-ideas/bottle-pump-blood-circulation-model/): The heart pumps blood in a loop through the lungs and the body, and valves make it flow one way. The model shows double circulation with two pumps, one for each side of the heart, and two tube loops. - [Model of the human eye with a water-filled ball lens](https://engineergurukul.com/resources/project-ideas/cardboard-tube-eye-model-with-bottle-lens/): The eye lens forms an upside-down image on the retina, and the brain turns it upright. A water lens and screen show how focus works and why spectacles help. - [Layered foam sheet model of a leaf cross-section with stomata](https://engineergurukul.com/resources/project-ideas/foam-sheet-leaf-cross-section-model/): A leaf has an epidermis, palisade cells full of chloroplasts, loose spongy cells with air spaces, veins and stomata. The layers are built to catch light and let gases move. - [Dough rise measured with a rubber band: sugar and salt effects](https://engineergurukul.com/resources/project-ideas/dough-rise-rubber-band-flour-sugar-salt/): Yeast in dough eats sugar and gives out carbon dioxide gas, which stretches the sticky gluten and raises the dough. By marking the height in glasses you measure how sugar and salt change the speed of rising. - [Salt and sugar as preservatives: pickling cut vegetables](https://engineergurukul.com/resources/project-ideas/pickling-vegetables-salt-sugar-preservation/): High concentrations of salt or sugar draw water out of microbes by osmosis, so they cannot grow and food keeps longer. You compare how well cut carrot or raw mango keeps with salt, sugar, both or nothing over two weeks. - [At what milk temperature does curd set best?](https://engineergurukul.com/resources/project-ideas/curd-setting-temperature-of-milk/): Curd forms when lactic acid bacteria grow in warm milk and turn lactose into lactic acid, which sets the milk proteins. You test milk at different temperatures to find the range in which the bacteria work best. - [How fast does milk sour: fridge, shade, sun and boiled](https://engineergurukul.com/resources/project-ideas/milk-souring-fridge-room-boiled/): Milk sours because bacteria grow and make lactic acid, and their speed depends on temperature and whether the milk was boiled. Smell, pH strips and curdling on heating show how quickly each sample spoils. - [Balloon biogas digesters: kitchen waste against cow dung slurry](https://engineergurukul.com/resources/project-ideas/balloon-biogas-digesters-kitchen-waste-against-dung/): Microbes break down organic waste without air and release biogas, mostly methane and carbon dioxide. Measuring balloon size over days compares how much gas different feedstocks give. - [Compost heap temperature log: heat from living microbes](https://engineergurukul.com/resources/project-ideas/compost-heap-temperature-log-in-a-bin/): Microbes breaking down garden waste release heat, so a compost heap warms up. A daily log of temperature shows the stages of composting and the effect of turning and moisture. - [Hydroponic mint and spinach grown in a cut bottle with no soil](https://engineergurukul.com/resources/project-ideas/hydroponic-mint-and-spinach-in-a-cut-bottle/): Plants can grow with their roots in nutrient water instead of soil. A bottle hydroponic setup shows that roots need water, nutrients and air, not soil itself. - [Fenugreek in nutrient water against garden soil: a growth race](https://engineergurukul.com/resources/project-ideas/fenugreek-in-water-against-soil-growth-race/): Comparing hydroponic and soil growth under the same light shows what soil adds and what plants really need. Measuring height, root length and mass gives data to judge each method. - [Cotton wick self-watering planter: how long can a plant go unwatered?](https://engineergurukul.com/resources/project-ideas/cotton-wick-self-watering-planter-test/): A wick moves water from a reservoir into the soil by capillary action. A plant in a wick pot stays healthy while a normal pot dries out, which shows how to save water and look after plants during holidays. - [Salty irrigation water: how much salt can seeds tolerate?](https://engineergurukul.com/resources/project-ideas/salty-irrigation-water-and-seed-germination/): Salt in irrigation water stops seeds from taking up water. Germination counts across different salt strengths show why saline groundwater harms crops. - [Compost, vermicompost and plain soil: which grows beans best?](https://engineergurukul.com/resources/project-ideas/compost-vermicompost-and-plain-soil-bean-growth/): Organic manures add nutrients and improve the soil. Growing the same bean in plain soil, compost and vermicompost shows the effect of each on growth. - [Neem, garlic and soap sprays compared on leaf-eating damage](https://engineergurukul.com/resources/project-ideas/neem-garlic-and-soap-sprays-on-leaf-damage/): Natural sprays can reduce insect damage on crops without strong pesticides. Counting damaged leaves on sprayed and unsprayed plants gives data on which home-made spray works best. - [Ant repellents compared: turmeric, chalk, clove powder and vinegar line](https://engineergurukul.com/resources/project-ideas/ant-trail-repellents-turmeric-chalk-clove-and-vinegar/): Ants follow chemical trails and avoid some household substances. Counting how many ants cross a line of each substance gives a safe test of natural repellents. - [Class seed bank of local varieties with germination record cards](https://engineergurukul.com/resources/project-ideas/community-seed-bank-with-germination-record-cards/): Saving seeds of local vegetables, pulses and flowers keeps variety alive. A record card for each seed packet teaches how farmers collect, dry, label, store and test seeds. - [Seed age and storage method: how germination falls with time](https://engineergurukul.com/resources/project-ideas/seed-age-and-storage-method-germination-test/): Seeds lose the ability to sprout over time, and storage conditions change how fast. Testing old and new seeds kept in different ways shows how to store seed for the next season. - [Protecting stored pulses from weevils with neem, ash and turmeric](https://engineergurukul.com/resources/project-ideas/protecting-stored-pulses-from-weevils-neem-ash-turmeric/): Grain stores lose food to weevils and beetles. Comparing traditional protectants in sealed jars shows how farmers can protect stored pulses without chemical sprays. - [Earthworm food choice chamber: what do vermicompost worms prefer?](https://engineergurukul.com/resources/project-ideas/earthworm-food-choice-chamber-for-vermicompost/): A choice chamber lets worms pick between foods. The amount eaten of each food shows what to feed a vermicompost bin and what to avoid. - [Thali balance survey: what food groups does a class eat at lunch?](https://engineergurukul.com/resources/project-ideas/thali-balance-class-lunch-survey/): A balanced meal has foods from several groups: cereals, pulses, vegetables, fruit, and milk products. A survey of lunch boxes shows which groups most students eat and which they miss. - [Pulse rate and recovery time after skipping, plotted on a graph](https://engineergurukul.com/resources/project-ideas/pulse-recovery-after-skipping-graph/): The heart beats faster during exercise to supply more oxygen to muscles. After stopping, the pulse falls back to its resting rate, and the time it takes is a simple sign of how the body recovers. - [Breaths per minute at rest, after stairs and after a short run](https://engineergurukul.com/resources/project-ideas/breathing-rate-rest-stairs-run/): Breathing rate increases with activity because the body needs to take in more oxygen and release more carbon dioxide. Counting breaths gives a simple measure of this change. - [School bag weight and standing posture: a photo and tape-measure survey](https://engineergurukul.com/resources/project-ideas/school-bag-weight-posture-photo-survey/): Heavy bags can change the way a student stands, with the head and shoulders leaning forward. Measuring bag weight as a share of body weight and checking posture in side photos gives data to discuss a safe bag load. - [Sleep diary and morning reaction time across a school week](https://engineergurukul.com/resources/project-ideas/sleep-diary-and-ruler-reaction-week/): Reaction time is how quickly we respond to a signal. Comparing the hours slept with the ruler-drop reaction distance each morning tests a common belief about sleep and alertness with your own data. - [Does washing longer remove more? A 5, 10 and 20 second hand-wash test](https://engineergurukul.com/resources/project-ideas/handwash-duration-dust-removal-test/): Soap helps to lift dirt and oily grime off the skin, and rubbing for longer removes more of it. A harmless coloured powder stands in for germs so that you can see how much is removed in a given time. - [Hidden sugar in cold drinks shown as spoonfuls on the table](https://engineergurukul.com/resources/project-ideas/cold-drink-hidden-sugar-spoon-model/): Many drinks carry a lot of sugar. By converting the grams on the label into teaspoons of sugar, you can see in a vivid way how much sugar is in a glass. - [Reading food labels: comparing three biscuits per 100 g](https://engineergurukul.com/resources/project-ideas/biscuit-label-reading-per-100g/): Packaged foods list energy, fat, sugar, protein and salt on the label. Comparing foods fairly means using the per 100 g column and not the per pack figure, which depends on pack size. - [Class water diary: how much do students drink on a hot school day?](https://engineergurukul.com/resources/project-ideas/class-water-diary-hot-school-day/): Water is lost through sweat, breath and urine, and has to be replaced by drinking and by the water in food. A diary of how much students drink shows the range between individuals and how heat affects it. - [Eggshell tooth test: which drinks stain and soften it overnight?](https://engineergurukul.com/resources/project-ideas/eggshell-tooth-drink-stain-and-soften/): An eggshell is made of calcium carbonate like tooth enamel is mostly calcium minerals. Soaking shells in different drinks shows which ones stain and which ones soften the shell, a model for why teeth need care. - [Salt in snack packets: a bar chart from sodium on the labels](https://engineergurukul.com/resources/project-ideas/salt-in-snack-packets-bar-chart/): Labels list sodium, not salt. Converting sodium in milligrams to salt in grams shows how quickly everyday snacks add up. This helps students read the label as a piece of data. - [Pupil size in bright and dim light, measured with a mirror and ruler](https://engineergurukul.com/resources/project-ideas/pupil-size-bright-and-dim-light-mirror/): The pupil gets smaller in bright light and larger in dim light, an automatic reflex that protects the eye and helps it see. A mirror and a ruler let you measure this change without any special equipment. - [One-leg balance time with eyes open, eyes closed and a moving floor](https://engineergurukul.com/resources/project-ideas/one-leg-balance-eyes-open-closed-timing/): Balance uses signals from the eyes, the inner ear, and the muscles and joints. Taking away the vision signal makes balancing much harder, which shows how the senses work together. - [Lung capacity measured by water displacement in a marked bottle](https://engineergurukul.com/resources/project-ideas/vital-capacity-bottle-displacement/): One deep breath out pushes an equal volume of water out of an upside-down bottle, so the volume of water displaced is the lung capacity of that breath. It shows that capacity varies with height, age and fitness. - [Phone camera drop lens: stomata on a leaf and life in pond water](https://engineergurukul.com/resources/project-ideas/phone-camera-drop-lens-stomata-pond-life/): A water drop or a clear gel bead stuck on a phone camera lens turns the phone into a microscope, enough to photograph stomata on a leaf peel and tiny organisms in pond water. It shows the pores that let a leaf breathe an - [Bile model: how liver juice breaks oil into tiny droplets](https://engineergurukul.com/resources/project-ideas/bile-model-detergent-breaks-oil/): Oil and water do not mix, but a drop of detergent makes oil spread into tiny droplets. Bile salts in the small intestine do the same job to fat, so that enzymes can work on it faster. ### Maths, Class 9 and 10 - [Pythagoras theorem model](https://engineergurukul.com/resources/project-ideas/pythagoras-theorem/): In a right-angled triangle, the square on the longest side has the same area as the squares on the other two sides together (a² + b² = c²). Cut the two smaller squares into pieces and they fit exactly into the big one. - [Area of a circle by cutting sectors](https://engineergurukul.com/resources/project-ideas/area-of-a-circle/): Cut a circle into many equal sectors and arrange them top to tail: they form a shape close to a rectangle with sides πr and r, so the area is πr². - [Probability with coins and dice](https://engineergurukul.com/resources/project-ideas/probability-coins-dice/): With only a few throws the results are uneven, but as the number of throws grows, the share of heads gets closer to one half and each face of a die to one sixth. - [Clinometer for heights and distances](https://engineergurukul.com/resources/project-ideas/clinometer-heights/): Measure the angle up to the top of a tree or building and your distance from its base. The height is the distance × tan(angle), plus the height of your eyes above the ground. - [Fibonacci numbers in nature](https://engineergurukul.com/resources/project-ideas/fibonacci-in-nature/): In the sequence 1, 1, 2, 3, 5, 8, 13 and so on, each number is the sum of the two before it, and the ratio of neighbours gets closer to about 1.618, the golden ratio. The spirals on sunflower heads and pine cones often c - [Napier's bones multiplication rods made from ice-cream sticks](https://engineergurukul.com/resources/project-ideas/napier-bones-ice-cream-sticks/): Each rod carries the multiplication table of one digit written in split boxes. Laying rods for 4 and 6 side by side and reading row 7 gives 7 times 46 = 322 by adding along the slanted lines, a 400-year-old calculating t - [Five Platonic solids folded from cardboard nets](https://engineergurukul.com/resources/project-ideas/five-platonic-solids-cardboard-nets/): Only five solids can be made with every face the same regular polygon and the same number of faces at every corner: the tetrahedron (4 triangles), cube (6 squares), octahedron (8 triangles), dodecahedron (12 pentagons) a - [Rice-pouring proof that a cone is one third of a cylinder](https://engineergurukul.com/resources/project-ideas/cone-fills-cylinder-three-times/): A paper cone and a paper cylinder with the same base radius and the same height are filled with rice. Exactly three cones of rice fill the cylinder, showing that the volume of a cone is one third of pi r squared h. - [Unit circle trigonometry board with a swinging radius arm](https://engineergurukul.com/resources/project-ideas/unit-circle-trig-board-swinging-arm/): A 10 cm arm pivots at the centre of a circle on a grid. At any angle, the height of its tip above the horizontal is 10 times the sine and the distance along the horizontal is 10 times the cosine, so at 30 degrees the tip - [Knotted 3-4-5 rope for making right angles like builders](https://engineergurukul.com/resources/project-ideas/knotted-rope-3-4-5-right-angle/): A rope with 13 knots at equal spacing is pulled into a triangle with sides of 3, 4 and 5 spaces. The angle between the 3 and 4 sides is exactly a right angle, because 3 squared plus 4 squared equals 5 squared, a rope met - [Measure a tree's height from shadows and similar triangles](https://engineergurukul.com/resources/project-ideas/tree-height-from-shadows-similar-triangles/): At the same moment the Sun makes the shadow of a tree and the shadow of a metre stick in the same proportion. If a 1 metre stick casts a 1.5 metre shadow and the tree casts a 9 metre shadow, the tree is 9 divided by 1.5, - [Nail-board Galton machine that drops beads into a bell curve](https://engineergurukul.com/resources/project-ideas/nail-board-galton-bell-curve/): Beads falling through seven rows of nails bounce left or right at random at each nail. With eight collecting slots at the bottom, the expected share of beads in each slot follows Pascal's triangle, 1, 7, 21, 35, 35, 21, - [Birthday paradox survey across the sections of a school](https://engineergurukul.com/resources/project-ideas/birthday-paradox-school-survey/): In a group of just 23 people there is a better than even chance (about 50.7 percent) that two share a birthday, and with 30 people the chance is about 70.6 percent. Collecting birthdays from many class sections shows how - [Balance beam that finds the mean of a data set](https://engineergurukul.com/resources/project-ideas/balance-beam-that-finds-the-mean/): Equal weights hung from a numbered beam at the data values balance only when the support is at the mean. Weights at 2, 3 and 7 balance at 4, their mean, and moving one weight from 7 to 13 shifts the balance point to 6, s - [Pascal's triangle cup pyramid with hidden number patterns](https://engineergurukul.com/resources/project-ideas/pascal-triangle-cup-pyramid/): Paper cups stacked in a triangle carry Pascal's numbers: each cup holds the sum of the two cups above it. Row sums double each time (1, 2, 4, 8, 16, 32), the second diagonal counts 1, 2, 3, 4, and the third diagonal hold - [Golden rectangle and spiral built from compass squares](https://engineergurukul.com/resources/project-ideas/golden-rectangle-compass-spiral-board/): Squares of side 1, 1, 2, 3, 5, 8 and 13 cm fit together into a rectangle of 13 cm by 21 cm, and a quarter circle in each square joins into a spiral. The ratio of the sides, 21 divided by 13, is about 1.615, close to the - [Estimate pi by scattering rice over a square and its circle](https://engineergurukul.com/resources/project-ideas/monte-carlo-pi-with-rice-grains/): Rice grains scattered evenly over a square land inside the circle drawn within it with probability equal to the circle's share of the area, which is pi divided by 4. Counting grains inside and outside and multiplying the - [Cardboard algebra tiles that factorise x squared plus 5x plus 6](https://engineergurukul.com/resources/project-ideas/cardboard-algebra-tiles-factorising/): Square tiles of side x, strips of x by 1 and unit squares are arranged into a rectangle. One x squared tile, five x strips and six unit tiles fit exactly into a rectangle with sides x + 2 and x + 3, so x squared + 5x + 6 - [Pinboard coordinate plane with string lines, slopes and intercepts](https://engineergurukul.com/resources/project-ideas/pinboard-coordinate-plane-string-lines/): Pins at grid points on a four-quadrant board let a string be stretched through any two points to show a straight line. The string through (0, 1) and (2, 5) rises 4 for every 2 across, slope 2, and crosses the y axis at 1 - [Matchstick Nim game board with its unbeatable strategy](https://engineergurukul.com/resources/project-ideas/matchstick-nim-winning-strategy/): Two players take 1, 2 or 3 sticks in turn from a pile of 21 and the player who takes the last stick wins. Whoever leaves a multiple of 4 after their move (20, 16, 12, 8, 4) can always win, so the first player wins a game - [Tower of Hanoi from bottle caps with the 2 to the n minus 1 rule](https://engineergurukul.com/resources/project-ideas/bottle-cap-tower-of-hanoi/): Discs of different sizes must be moved from one peg to another, one at a time, never putting a larger disc on a smaller one. The least number of moves is 1, 3, 7, 15, 31 and 63 for 1 to 6 discs, which is 2 to the power n - [Day-of-the-week wheel that dates any day with the doomsday rule](https://engineergurukul.com/resources/project-ideas/day-of-week-calculator-wheel/): In any year the dates 4/4, 6/6, 8/8, 10/10, 12/12, 9/5, 5/9, 7/11, 11/7 and the last day of February all fall on the same weekday, called the doomsday. A wheel finds the doomsday for the year, and counting from the neare - [Geared clock hands model that measures the angle between hands](https://engineergurukul.com/resources/project-ideas/clock-hands-angle-model/): The minute hand turns 6 degrees per minute and the hour hand half a degree per minute, so the angle between them at any time is the difference of 30 times the hours and 5.5 times the minutes. At 3:00 the angle is 90 degr - [Vedic maths flip board for squaring numbers ending in 5](https://engineergurukul.com/resources/project-ideas/vedic-squares-ending-in-five-flip-board/): To square a number ending in 5, multiply the tens digit by the next number up and write 25 after it: 35 squared is 3 times 4 = 12 followed by 25, so 1,225. The flip board shows each step and the algebra behind it: (10a + - [Nikhilam slider that multiplies numbers near 100 in one line](https://engineergurukul.com/resources/project-ideas/nikhilam-base-100-slider/): To multiply 97 by 96, write how far each is below 100 (3 and 4). Subtract crosswise, 97 minus 4 = 93, and multiply the deficits, 3 times 4 = 12, to get 9,312. The slider lines up the two numbers and their deficits so the - [String art parabola made from straight lines only](https://engineergurukul.com/resources/project-ideas/string-art-parabola-envelope/): Threads joined between two scales at right angles, the first point on one to the last on the other and so on, form no curve themselves, yet their edges outline a smooth parabola. The curve is the envelope of the lines, t - [Seven bridges of Konigsberg board with removable bridges](https://engineergurukul.com/resources/project-ideas/konigsberg-bridges-removable-board/): Four land areas joined by seven bridges cannot be walked in one trip crossing every bridge once, because every land area has an odd number of bridges. Lifting any one bridge off the board leaves only two odd areas and th - [Width of a pond or river from a baseline and the sine rule](https://engineergurukul.com/resources/project-ideas/pond-width-sine-rule-baseline/): You can find a distance you cannot measure directly by measuring a baseline and two angles. The sine rule in the triangle then gives the width. - [Sine wave drawn by a turning wheel and a moving roll of paper](https://engineergurukul.com/resources/project-ideas/sine-curve-from-rotating-wheel-roll-of-paper/): The height of a point on a turning wheel, measured above the centre, follows a sine curve in time. Tracing it on moving paper gives amplitude, period and a smooth wave. - [Arm span against height: scatter plot, mean, spread and best-fit line](https://engineergurukul.com/resources/project-ideas/arm-span-height-scatter-and-line-of-best-fit/): Two measurements on the same person can be linked. Collecting data for a class and drawing a scatter plot, a line of best fit and a correlation shows how statistics finds a pattern in data. - [Area of a leaf by random dots: a Monte Carlo estimate with a check](https://engineergurukul.com/resources/project-ideas/leaf-area-by-random-dots-monte-carlo/): The area of an odd shape can be estimated by throwing random points on a square that contains it. The share of points that land inside the shape estimates the share of the square it covers. - [Monty Hall with three cups: should you switch? 100 trials and the proof](https://engineergurukul.com/resources/project-ideas/monty-hall-three-cups-game-experiment/): In the three-door puzzle, switching wins two times out of three, though many people feel that it is a fifty-fifty choice. Playing it many times and listing all the outcomes shows why. - [How long is a game of snakes and ladders? 100 simulated games](https://engineergurukul.com/resources/project-ideas/snakes-and-ladders-average-game-length/): The number of turns to finish a game is random but has a stable average. Playing or simulating many solo games gives the mean game length and shows how the snakes and ladders change it. - [Balancing a cardboard triangle at its centroid, checked by coordinates](https://engineergurukul.com/resources/project-ideas/centroid-of-triangle-balancing-coordinates/): The point where the three medians of a triangle meet is its centroid, and a flat triangle balances there. Its coordinates are the average of the three vertex coordinates. - [Taxicab geometry on a city grid: distances, midpoints and square circles](https://engineergurukul.com/resources/project-ideas/taxicab-geometry-city-grid-circles/): On a street grid you cannot travel diagonally, so the distance is the sum of the horizontal and vertical steps. With this rule a circle looks like a diamond, which shows that geometry depends on how distance is defined. - [Bouncing ball: a geometric sequence of heights and its infinite sum](https://engineergurukul.com/resources/project-ideas/bouncing-ball-geometric-sequence-sum-to-infinity/): A ball that bounces back to a fixed fraction of its previous height gives a geometric sequence of heights. The total distance travelled until it stops is the sum of a geometric series. - [Straw and pipe-cleaner dome that shows why triangles are rigid](https://engineergurukul.com/resources/project-ideas/straw-geodesic-dome-triangle-rigidity/): A four-sided frame can collapse but a triangle cannot change shape without changing the length of a side. A dome of triangles is strong and light. - [Straw and protractor clinometer to find building height by trigonometry](https://engineergurukul.com/resources/project-ideas/cardboard-clinometer-height-by-trigonometry/): The height of a tall object can be found from the angle of elevation and the distance to its base using tan of the angle. The clinometer measures that angle. - [Decoding the home electricity bill: units, slabs and appliance costs](https://engineergurukul.com/resources/project-ideas/electricity-bill-units-and-slab-rates-maths/): A bill is calculated from units used, in kilowatt hours, at slab rates plus fixed charges. By computing the energy of each appliance and checking it against the bill, you apply percentages, multiplication and a piecewise - [Piggy bank mathematics: simple against compound interest](https://engineergurukul.com/resources/project-ideas/simple-and-compound-interest-piggy-bank-table/): Money in a deposit can earn simple interest, only on the original amount, or compound interest, on the growing total. Tables and graphs for Rs 1,000 over ten years show how the two grow apart. - [Is a 1 kg packet really 1 kg? Sampling and averages with a kitchen scale](https://engineergurukul.com/resources/project-ideas/is-a-one-kg-packet-really-one-kg-sampling/): No two packets weigh exactly the same, so averages, ranges and standard deviation describe how close the packets are to the printed weight. You weigh sample packets and decide whether the pack is accurate. - [String wound on a half ball: surface area of a sphere is four circles](https://engineergurukul.com/resources/project-ideas/sphere-surface-area-string-wound-on-a-ball/): The string that covers the curved surface of a hemisphere covers exactly two flat circles of the same radius, so a hemisphere has an area 2 pi r squared. A whole sphere is therefore four circles, 4 pi r squared. - [Cone, hemisphere and cylinder of equal radius: volumes in ratio 1 to 2 to 3](https://engineergurukul.com/resources/project-ideas/cone-hemisphere-cylinder-rice-volumes-one-two-three/): A cone, a hemisphere and a cylinder with the same radius, and height equal to the radius for the cone and cylinder, have volumes in the ratio 1 to 2 to 3. Pouring rice from a cone and a hemisphere together exactly fills - [Mirror on the ground: finding the height of a tree or building by similar triangles](https://engineergurukul.com/resources/project-ideas/mirror-on-the-ground-height-by-similar-triangles/): A small mirror on the ground, a tape and your own eye height are enough to find the height of a pole, tree or building without climbing it. Light reflecting from the mirror forms two similar right triangles, so the heigh - [Pin and thread board for the circle theorem: angle at the centre is double](https://engineergurukul.com/resources/project-ideas/pinboard-circle-theorem-angle-at-centre-double/): On a circle, an arc makes an angle at the centre exactly twice the angle it makes at any point on the remaining circumference. Moving the pin around the circle shows that the angle at the edge does not change. - [One 40 cm thread loop, many shapes: which encloses the most area?](https://engineergurukul.com/resources/project-ideas/forty-cm-thread-loop-shapes-largest-area/): A closed loop of thread of fixed length can be made into a triangle, rectangle, square, hexagon or circle. The enclosed area grows as the shape gets more regular and is largest for the circle, so for a fixed perimeter th ### Earth and space, Class 9 and 10 - [Sundial](https://engineergurukul.com/resources/project-ideas/sundial/): As the Earth turns, the Sun appears to move across the sky and the pointer’s shadow moves with it. For better readings, tilt the pointer towards the north at an angle equal to your latitude (about 28 to 29 degrees in Del - [Seismograph model](https://engineergurukul.com/resources/project-ideas/seismograph/): A heavy hanging pen tends to stay still (inertia) while the box and paper shake beneath it, so the pen draws the shaking as a wiggly line. - [Why we have seasons](https://engineergurukul.com/resources/project-ideas/seasons-model/): The Earth’s axis is tilted by about 23.5 degrees. As the Earth goes round the Sun, each half spends part of the year tilted towards the Sun, with stronger and longer sunlight: that is its summer. Seasons are not caused b - [Hair hygrometer that measures humidity with a single strand](https://engineergurukul.com/resources/project-ideas/hair-hygrometer-humidity-meter/): Human hair gets slightly longer when the air is humid and shorter when it is dry. A long hair pulling on a pointer turns this tiny change into a visible movement, which is how real hair hygrometers worked for two centuri - [Why volcanoes have different shapes: a lava thickness test](https://engineergurukul.com/resources/project-ideas/lava-thickness-and-volcano-shape/): Runny lava spreads far and builds wide, low shield volcanoes; thick, sticky lava piles up near the vent and builds steep cones. Draining liquids of different viscosity through a hole in a paper cup onto a tray shows the - [Hand-driven shake table that tests which tower survives an earthquake](https://engineergurukul.com/resources/project-ideas/shake-table-earthquake-building-test/): Earthquake waves shake the ground sideways. A simple shake table shows that wide-based, cross-braced and lighter-topped buildings stay up longer than tall, narrow, top-heavy ones, which is why real buildings in earthquak - [Scratch test kit that ranks local rocks on the Mohs hardness scale](https://engineergurukul.com/resources/project-ideas/mineral-hardness-scratch-test/): A harder material scratches a softer one. Using a fingernail, a copper coin, a steel nail and a piece of glass as reference points, any rock or mineral can be placed on the Mohs hardness scale from 1 to 10. - [Jar settling test that finds the sand, silt and clay in garden soil](https://engineergurukul.com/resources/project-ideas/soil-texture-jar-settling-test/): Soil is a mixture of sand, silt and clay particles of different sizes. Shaken in water, the heavy sand sinks in a minute, silt in a few hours and clay over days, so the layers in the jar show the soil's texture. - [Lunar eclipse model that explains why the Moon turns red](https://engineergurukul.com/resources/project-ideas/lunar-eclipse-red-moon-model/): A lunar eclipse happens at full moon when the Earth moves between the Sun and the Moon and the Moon passes through the Earth's shadow. The Moon does not go fully black because the Earth's atmosphere bends red sunlight in - [Rotating planisphere star finder for your latitude](https://engineergurukul.com/resources/project-ideas/planisphere-star-finder-dial/): A planisphere is a star map on a dial with a window shaped for one latitude. Turning the dial to the date and time shows exactly which stars are above the horizon, which demonstrates how the sky shifts through the night - [Moon and tides model with two bulges and a spinning Earth](https://engineergurukul.com/resources/project-ideas/moon-and-tides-two-bulge-model/): The Moon's gravity pulls the oceans into a bulge on the side facing it and a second bulge on the opposite side. As the Earth turns under the two bulges, most coasts see two high tides and two low tides a day. - [Solar system distances rolled out on a toilet paper strip](https://engineergurukul.com/resources/project-ideas/planet-distances-on-a-toilet-roll/): The planets are not evenly spaced. On a scale where the Sun to Neptune is 100 sheets of toilet paper, the four rocky planets all fit within about the first 5 sheets and the gaps between the outer planets grow huge, somet - [Torch on a grid showing why slanting sunlight gives cooler seasons](https://engineergurukul.com/resources/project-ideas/sun-angle-and-seasons-torch-grid/): The same beam of light spread over a larger area heats each square less. Sunlight arrives at a slant in winter and spreads thin, which is the main reason winter is cold, not the small change in distance from the Sun. - [Stream table in a tray that grows river meanders and sandbars](https://engineergurukul.com/resources/project-ideas/stream-table-meander-model/): A river flowing over loose sediment erodes the outside of each bend, where water moves fastest, and deposits sand on the inside, where it is slow. Over time the bends grow into meanders and may be cut off to leave oxbow - [Aquifer in a jar with a working well and a pollution test](https://engineergurukul.com/resources/project-ideas/groundwater-aquifer-in-a-jar/): Groundwater is not an underground lake but water filling the spaces between grains of sand and gravel. A straw well draws it out, rain refills it from above, and anything spilled on the surface can reach the well, showin - [Why the monsoon blows: sand versus water heating and cooling test](https://engineergurukul.com/resources/project-ideas/monsoon-land-and-sea-heating-test/): Land heats and cools much faster than water. In summer the hot Indian land has low pressure and air flows in from the cooler sea, carrying moisture; in winter the land is colder and the flow reverses. Measuring sand and - [Measuring the Earth’s circumference from shadows in two cities](https://engineergurukul.com/resources/project-ideas/earth-circumference-two-shadows-eratosthenes/): Eratosthenes found the size of the Earth by comparing noon shadows at two places a known distance apart. You can repeat it with a friendly school in another city to find the Earth’s circumference. - [Find your latitude with a straw, a protractor and the Pole Star](https://engineergurukul.com/resources/project-ideas/find-your-latitude-pole-star-straw-protractor/): The height of the Pole Star above the horizon is nearly equal to your latitude in the northern hemisphere. A homemade angle measurer can show your place on Earth. - [Diameter of the Sun from a pinhole image on a card](https://engineergurukul.com/resources/project-ideas/diameter-of-the-sun-from-a-pinhole-image/): The Sun’s image through a small hole is a circle whose size depends on the distance to the screen. Using similar triangles with the Sun’s distance gives its real diameter, about 1.4 million km. - [Parallax: measuring distance to a tree with a thumb and your eyes](https://engineergurukul.com/resources/project-ideas/parallax-distance-thumb-method-and-baseline/): A nearby object appears to shift against a far background when you view it from two places. Measuring the shift and the baseline gives its distance, the same method astronomers use for nearby stars. - [Counting stars in a tube: a light pollution survey of your town](https://engineergurukul.com/resources/project-ideas/star-count-in-a-tube-light-pollution-survey/): The number of stars you can see falls when street lights and glare brighten the sky. Counting stars in a fixed patch of sky at different places gives a simple measure of light pollution. - [Capillary rise of water in sand, silt and clay columns](https://engineergurukul.com/resources/project-ideas/capillary-rise-in-sand-silt-and-clay-columns/): Water climbs up through the tiny gaps between soil grains. Fine soils such as clay can lift water higher but slowly, and coarse sand lifts it only a little but fast, which matters for how crops reach water. - [Sand tank with two wells: drawdown and well interference](https://engineergurukul.com/resources/project-ideas/sand-tank-two-wells-drawdown-and-interference/): Pumping water from a well lowers the water table around it in a cone shape. Two close wells lower each other’s water, which is why borewells too near each other fail in summer. - [Crumpled paper watershed that traces rain and pollution to the river](https://engineergurukul.com/resources/project-ideas/crumpled-paper-watershed-map-traces-rain-and-pollution/): A watershed is the land that drains to one river. Spraying water on a crumpled sheet shows ridges, valleys and how water, and anything on the ground, ends up in the stream. - [Solar system to scale on a school field, planet by planet](https://engineergurukul.com/resources/project-ideas/planets-to-scale-school-field-walk/): When distances between planets are drawn to the same scale as their sizes, space turns out to be almost entirely empty. Walking from the Sun to Neptune makes this gap between worlds felt in your legs. - [Star trail sketches that show the Earth turning](https://engineergurukul.com/resources/project-ideas/star-trail-sketches-earth-turning/): Stars appear to turn around the Pole Star because Earth spins on its axis once a day. Sketches made hours apart reveal arcs, and the amount of turning matches about 15 degrees an hour. - [Equinox noon shadow: finding your latitude with a vertical stick](https://engineergurukul.com/resources/project-ideas/equinox-noon-shadow-latitude/): On an equinox the Sun is directly over the equator at noon. The angle of the Sun above the horizon at your place is then 90 degrees minus your latitude, so a shadow measurement gives your latitude within a degree or two. - [Stretched cloth gravity well with marbles in orbit](https://engineergurukul.com/resources/project-ideas/stretched-cloth-gravity-well-marbles/): A heavy ball on a stretched cloth makes a dip, and small marbles rolled nearby curve round it and spiral in. This is a simple analogy for how a massive object like the Sun pulls on planets; unlike real planets in empty s - [ISRO missions timeline strip from Aryabhata to Gaganyaan](https://engineergurukul.com/resources/project-ideas/isro-missions-timeline-strip-model/): India’s space journey took place in steps, from a first satellite in 1975 to Moon and Mars missions and crewed spaceflight plans. A scaled timeline shows how fast the steps came and what each learnt. - [Night-sky clock that tells time from the Saptarishi stars](https://engineergurukul.com/resources/project-ideas/star-clock-nocturnal-saptarishi/): The Saptarishi (Great Bear) pattern turns around the Pole Star once in about 24 hours, like a giant clock hand. A simple two-disc instrument called a nocturnal can use it to tell the time at night. - [Globe and torch model of sunrise time gaps across India](https://engineergurukul.com/resources/project-ideas/india-single-time-zone-sunrise-gap/): India uses one standard time, but the Sun rises up to about two hours earlier in far-eastern Arunachal Pradesh than in western Gujarat. A globe and torch show why places east and west of each other have different local t - [Pinhole projector for watching a partial solar eclipse safely](https://engineergurukul.com/resources/project-ideas/pinhole-projector-partial-eclipse-viewing/): A tiny hole makes an upside-down image of the Sun on a screen. During a partial eclipse the image shows a bite taken out of the disc, so you can watch without looking at the Sun. - [Measuring the Moon’s angular size with a coin and a metre ruler](https://engineergurukul.com/resources/project-ideas/moon-angular-size-coin-ruler/): An object’s apparent size depends on its distance. A coin held at a measured distance from your eye (a few metres for an ordinary coin) that just covers the Moon gives the Moon’s angular size, about half a degree, and th - [Eratosthenes’ method: estimating Earth’s size from two cities’ shadows](https://engineergurukul.com/resources/project-ideas/eratosthenes-earth-size-two-cities/): Two sticks in two cities, measured at noon on the same day, give different shadow angles. The difference, together with the distance between the cities, gives the circumference of Earth. - [Comet model whose tail always points away from the Sun](https://engineergurukul.com/resources/project-ideas/comet-model-tail-away-from-sun/): A comet’s tail always points away from the Sun, even when the comet is moving away. The solar wind and light push the dust and gas outwards, so the tail leads when the comet is going away. - [Mars rover model with rocker-bogie suspension from cardboard](https://engineergurukul.com/resources/project-ideas/mars-rover-rocker-bogie-model/): A rocker-bogie suspension lets a six-wheeled rover climb over rocks about as big as its wheels without tipping. The body stays almost level because the arms pivot. ### Electronics and robotics, Class 9 and 10 - [Automatic street light with an LDR](https://engineergurukul.com/resources/project-ideas/automatic-street-light/): A light dependent resistor (LDR) has a high resistance in the dark and a low resistance in light. A transistor uses that change to switch the LED on when it gets dark. - [Water level indicator](https://engineergurukul.com/resources/project-ideas/water-level-indicator/): Tap water conducts a little electricity because of the salts dissolved in it. As the water rises it touches wires at different heights, and transistors light an LED or sound a buzzer for each level. - [Smart dustbin with Arduino](https://engineergurukul.com/resources/project-ideas/smart-dustbin/): An ultrasonic sensor sends out a pulse of sound and times its echo to measure distance. When a hand comes close, the Arduino tells a servo motor to lift the lid. - [Obstacle-avoiding robot](https://engineergurukul.com/resources/project-ideas/obstacle-avoiding-robot/): The robot measures the distance ahead with an ultrasonic sensor. When something is too close, the program stops, turns and looks for a clear path, driving the motors through a motor driver. - [Line follower robot](https://engineergurukul.com/resources/project-ideas/line-follower-robot/): IR sensors shine infrared light at the floor: white reflects it and black absorbs it. The controller reads which sensor sees the line and steers the motors to stay on it. - [Automatic plant watering system](https://engineergurukul.com/resources/project-ideas/automatic-plant-watering/): A soil moisture sensor gives a reading that changes with the water in the soil. When the soil is dry, the Arduino switches on a small pump until it is moist again. - [Pocket dark detector that beeps when you cover the LDR](https://engineergurukul.com/resources/project-ideas/ldr-dark-detector-buzzer/): A light dependent resistor has a low resistance in bright light and a very high resistance in the dark. In a voltage divider with a fixed resistor, this change swings the base voltage of a transistor, which switches a bu - [Bucket overflow alarm that beeps when water touches two wires](https://engineergurukul.com/resources/project-ideas/bucket-overflow-alarm-darlington/): Tap water conducts a small current because of dissolved salts. Two BC547 transistors joined as a Darlington pair multiply that tiny current enough to drive a buzzer, so the alarm sounds the moment water bridges the probe - [Rain alarm with an interleaved foil strip sensor on a card](https://engineergurukul.com/resources/project-ideas/rain-alarm-foil-strip-sensor/): Raindrops bridge the gap between two sets of foil strips that are close but not touching. The water lets a tiny current flow, which a Darlington pair of BC547 transistors amplifies to sound a buzzer, warning you to bring - [Two-station Morse telegraph line across a room with LEDs](https://engineergurukul.com/resources/project-ideas/two-station-morse-telegraph-line/): Two keys and two indicator LEDs on one long wire pair let either station send to the other. It shows that a signal is really a current switched on and off, and that one shared return wire is enough for a two-way line. - [Energy transfer: one toy motor spins another that lights an LED](https://engineergurukul.com/resources/project-ideas/motor-to-motor-generator-link/): A DC motor is also a generator. When a second motor is turned by the first, its coil spins inside its magnets and produces a voltage that lights an LED, showing that electrical and mechanical energy can be converted in b - [Salt water conductivity tester with a transistor and an LED](https://engineergurukul.com/resources/project-ideas/salt-water-conductivity-tester-transistor/): Water conducts electricity only through dissolved ions. Two probes in a liquid feed a tiny current into a transistor, which amplifies it to light an LED. Distilled water and sugar water give little or nothing, while tap - [Pocket continuity tester with a buzzer and an LED in a tic-tac box](https://engineergurukul.com/resources/project-ideas/pocket-continuity-tester-buzzer-led/): A continuity tester tells you whether a path conducts: touch its two probes to the ends of a wire, a fuse or a switch and it beeps if current can flow. It is the first tool for finding broken wires and checking which mat - [Cardboard conveyor belt driven by a toy motor and rubber band](https://engineergurukul.com/resources/project-ideas/cardboard-conveyor-belt-rubber-band-drive/): A motor turns a small pulley, a rubber band carries that rotation to a larger roller, and a loop of cloth belt stretched between two rollers moves objects along. It shows belt drives, friction grip and speed reduction th - [Motorised cardboard crane that lifts a load with a thread spool and reversing switch](https://engineergurukul.com/resources/project-ideas/motorised-spool-crane-reversing-switch/): A motor winding thread onto a spool converts rotation into lifting. A DPDT slide switch swaps the battery polarity so the same motor raises and lowers the hook, which is how real crane winches are controlled. - [Electric bell model with a nail electromagnet and a hacksaw blade clapper](https://engineergurukul.com/resources/project-ideas/nail-electromagnet-electric-bell-model/): An electromagnet pulls a springy steel strip towards it, which breaks its own contact, loses the magnetism and springs back to close the contact again. The strip vibrates to and fro, striking a tin lid to ring like a doo - [555 timer blinking an LED once a second on a breadboard](https://engineergurukul.com/resources/project-ideas/555-astable-blinking-led-one-hertz/): A 555 timer in astable mode charges and discharges a capacitor through two resistors, producing a steady stream of pulses. With 1 kΩ, 680 kΩ and 1 µF the output switches about once a second, blinking an LED without any s - [Finger touch sensor with two BC547 transistors that lights an LED](https://engineergurukul.com/resources/project-ideas/darlington-finger-touch-sensor-led/): Dry skin has a resistance of hundreds of kilohms, far too high to light an LED directly. Two transistors in a Darlington pair multiply the microampere current through a fingertip by about 40,000, so a light touch across - [555 tone generator with a knob that changes the pitch of a piezo disc](https://engineergurukul.com/resources/project-ideas/555-variable-pitch-tone-generator-piezo/): Running a 555 astable fast enough produces audio frequencies. A potentiometer changes the timing resistance, so turning the knob slides the pitch up and down, demonstrating the link between frequency and pitch. - [Magnetic door alarm with a reed switch that sounds when the door opens](https://engineergurukul.com/resources/project-ideas/reed-switch-door-open-alarm/): A reed switch closes when a magnet is near and opens when it moves away. With the magnet on the door and the switch on the frame, opening the door removes the magnet, and a transistor circuit turns the buzzer on, the sam - [Bicycle wheel revolution flasher with a spoke magnet and a reed switch](https://engineergurukul.com/resources/project-ideas/bicycle-wheel-reed-switch-revolution-flasher/): A magnet on a spoke closes a reed switch on the fork once every turn, flashing an LED. Counting flashes in a known time and knowing the wheel circumference gives the bicycle speed, the same method a bike speedometer uses - [Thermistor hot water warning that beeps when a cup gets too hot](https://engineergurukul.com/resources/project-ideas/thermistor-hot-water-warning-buzzer/): An NTC thermistor loses resistance as it warms. In a voltage divider with a potentiometer, warming raises the transistor base voltage until it switches a buzzer on, giving an adjustable temperature alarm like the one in - [Cold night warning LED for seedlings using an NTC thermistor](https://engineergurukul.com/resources/project-ideas/thermistor-cold-night-seedling-warning-led/): With the thermistor placed on the ground side of a voltage divider, cooling raises its resistance and the base voltage, lighting an LED when the air drops below a set temperature. It shows how the same sensor can trigger - [Relay latching alarm that stays on after one press until reset](https://engineergurukul.com/resources/project-ideas/relay-latching-alarm-push-button-reset/): A relay module can hold itself on: once its coil is energised, its own contact keeps feeding the coil even after the trigger button is released. This latch is how real alarm panels remember that a sensor tripped, until s - [Night fan: an LDR and relay module that start a motor when it gets dark](https://engineergurukul.com/resources/project-ideas/ldr-relay-night-fan-motor/): A small sensor signal can control a bigger load through a relay. The LDR and transistor sense darkness, the relay module switches a separate motor circuit, and the two circuits never share current, which is how electroni - [Solar powered spinner: a small solar cell drives a toy motor top](https://engineergurukul.com/resources/project-ideas/solar-cell-spinning-top-motor/): A solar cell turns light directly into electrical energy. Connected to a toy motor with a paper disc, it spins in sunlight, slows in shade and stops indoors, showing how output depends on the amount and angle of light. - [How the angle of a solar cell changes its voltage and LED brightness](https://engineergurukul.com/resources/project-ideas/solar-cell-angle-voltage-investigation/): The electrical output of a solar cell falls as the light strikes it at a shallower angle, because the same beam is spread over a bigger area. Measuring voltage and current at known tilt angles shows why rooftop panels in - [PIR corridor light that stays on for a set time after movement](https://engineergurukul.com/resources/project-ideas/pir-corridor-light-with-hold-timer/): A passive infrared (PIR) sensor detects the heat of a moving person. An Arduino switches a 12 V LED strip on through a relay and keeps it on for a timer period that restarts with every new movement, so the light never cu - [Room comfort meter with DHT11 and an OLED display](https://engineergurukul.com/resources/project-ideas/dht11-oled-room-comfort-meter/): A DHT11 measures temperature and relative humidity, an Arduino calculates a heat index, and a small OLED screen shows the readings with a comfort message. The project shows how a digital sensor sends numbers over one wir - [Flame sensor store room alarm with a small sprinkler pump](https://engineergurukul.com/resources/project-ideas/flame-sensor-store-room-alarm-with-sprinkler-pump/): An infrared flame sensor module detects the near-infrared light given out by a flame from up to about half a metre away. The Arduino sounds an alarm and runs a 5 V submersible pump through a relay so a tiny sprinkler spr - [Automatic curtain that opens at dawn using an LDR and a DC motor](https://engineergurukul.com/resources/project-ideas/ldr-automatic-curtain-with-l298n-motor/): An LDR measures daylight, the Arduino decides open or closed, and an L298N driver runs a geared DC motor in either direction to pull a string curtain across a model window. Two limit switches stop the motor at each end. - [Rain sensor that closes a model window with a servo when drops fall](https://engineergurukul.com/resources/project-ideas/rain-sensor-servo-window-closer/): A rain sensor board has interleaved copper tracks whose resistance drops when water bridges them. The Arduino reads that change and swings a servo to shut a hinged cardboard window, then reopens it when the board dries. - [Tipping bucket rain gauge with a reed switch counted by Arduino](https://engineergurukul.com/resources/project-ideas/tipping-bucket-rain-gauge-reed-switch-counter/): Rain collected by a funnel fills one side of a tiny see-saw bucket; when it tips, a magnet passes a reed switch and the Arduino counts one tip. Knowing the volume per tip and the funnel area gives rainfall in millimetres - [Field bird scarer that flaps and beeps when a PIR detects movement](https://engineergurukul.com/resources/project-ideas/pir-bird-scarer-with-servo-flapper/): A PIR sensor detects a bird or animal entering a model field; the Arduino then flaps a shiny ribbon with a servo and plays random beeps for a few seconds. Random timing stops birds getting used to it, a real problem with - [Grain store humidity alarm with an ESP8266 that warns the phone](https://engineergurukul.com/resources/project-ideas/grain-store-humidity-alert-esp8266/): A DHT11 inside a model grain bin watches humidity; stored grain spoils and grows mould when air humidity stays high. The NodeMCU shows the reading on a phone page, sounds a buzzer and sends an alert when humidity stays a - [Classroom noise meter with a sound sensor, LED bar and OLED readout](https://engineergurukul.com/resources/project-ideas/noise-level-meter-sound-sensor-led-bar/): A microphone sound sensor module gives a voltage that swings with sound pressure. The Arduino measures the swing over short windows, shows it on an LED bar and an OLED, and flashes a warning when the class is too loud fo - [Alternate LED flasher with two BC547 transistors and two capacitors](https://engineergurukul.com/resources/project-ideas/two-transistor-led-flasher-bc547/): Two transistors, each switching the other through a capacitor, make an astable multivibrator: a circuit with no stable state that swaps over by itself. The two LEDs flash alternately about once a second. - [LED strings on a 9 V battery: working out resistors for series and parallel](https://engineergurukul.com/resources/project-ideas/series-parallel-led-strings-9v-resistor-sums/): Three red LEDs in series share one resistor and draw one LED worth of current, while three in parallel each need their own resistor and draw three times as much. Working out the resistor with R = (supply minus LED voltag - [Knob dimmer for an LED using a 10 kΩ potentiometer on a 9 V battery](https://engineergurukul.com/resources/project-ideas/potentiometer-led-dimmer-knob/): A potentiometer wired as a variable resistor changes how much current an LED gets, so turning the knob dims or brightens the light. Less resistance gives more current and more light. - [Weak cell finder: loaded and unloaded voltage of old and new AA cells](https://engineergurukul.com/resources/project-ideas/weak-cell-finder-loaded-voltage-test/): A cell that reads 1.4 V with nothing connected can still be nearly flat, because its internal resistance has grown. A voltage reading while it lights a small bulb shows the true condition. - [Three-LED water level indicator for a bottle using three BC547 transistors](https://engineergurukul.com/resources/project-ideas/three-level-water-indicator-bc547-leds/): Water with a little salt conducts a tiny current. Each probe that touches the water passes enough base current to switch a BC547 on, so one LED lights for each level reached. - [Polarity-proof LED lamp: a four-diode bridge that works either way round](https://engineergurukul.com/resources/project-ideas/four-diode-bridge-polarity-proof-led/): A diode lets current through in one direction only. Four diodes arranged as a bridge always pass the current the same way through the LED, so the lamp lights even if the battery is connected backwards. - [Push button LED that fades out slowly, powered by a charged capacitor](https://engineergurukul.com/resources/project-ideas/capacitor-fade-out-led-push-button/): A capacitor stores charge like a tiny rechargeable tank. A quick press of a button fills it, and when the button is released the capacitor keeps the LED glowing for several seconds as it empties. - [Measuring the current gain of a BC547 with a 1 MΩ and a 1 kΩ resistor](https://engineergurukul.com/resources/project-ideas/bc547-current-gain-measurement-two-resistors/): A transistor turns a very small base current into a much larger collector current. The ratio Ic / Ib, called the current gain, can be found with a multimeter and two resistors. - [Hot water alarm that buzzes when an NTC thermistor reaches about 45 degrees](https://engineergurukul.com/resources/project-ideas/hot-water-alarm-ntc-thermistor-buzzer/): An NTC thermistor is a resistor whose resistance falls as it gets hotter. In a voltage divider, this change swings a transistor base voltage and switches a buzzer on at a chosen temperature. - [Light-chasing buggy with two LDR eyes steering two toy motors](https://engineergurukul.com/resources/project-ideas/light-chasing-buggy-two-ldr-two-motors/): Each light dependent resistor switches the motor on the opposite side, so the buggy turns towards the brighter side and drives at a torch. This is a simple analogue form of phototaxis used in robots. - [Knock sensor: a piezo disc and a BC547 that flash an LED when you tap the desk](https://engineergurukul.com/resources/project-ideas/piezo-knock-sensor-flash-led-bc547/): A piezoelectric disc makes a small voltage when it is squeezed or struck. A transistor amplifies this short pulse so it lights an LED for a moment. - [Secret code box: four toggle switches in series that light an LED in one setting](https://engineergurukul.com/resources/project-ideas/secret-code-box-four-toggle-switches-series/): Switches in series work like the word AND: the loop is complete only if every switch is in its correct position. With four two-way toggles there are 16 settings and only one lights the LED. - [Toy motor dynamo run by a bicycle tyre with two opposite LEDs](https://engineergurukul.com/resources/project-ideas/bicycle-tyre-dynamo-two-opposite-leds/): A DC motor works backwards as a generator. When its shaft is turned by a spinning tyre it makes a voltage, and reversing the spin reverses the voltage, which lights the other LED of an opposite pair. - [Voltage divider board: measured against calculated voltages with a 10 kΩ load](https://engineergurukul.com/resources/project-ideas/voltage-divider-board-measured-vs-calculated/): Two resistors in series share a voltage in proportion to their sizes. A load connected to the output pulls the voltage down, which is why dividers are not power supplies. - [Two-tone siren built from two 555 timers and a small speaker](https://engineergurukul.com/resources/project-ideas/two-tone-siren-two-555-timers/): One 555 timer makes a slow beat of about one per second, and it wobbles the pitch of a second 555 that produces an audible tone. Together they give a two-tone warbling siren. - [Delay light: two BC547 transistors and a 100 µF capacitor that switch on after 20 seconds](https://engineergurukul.com/resources/project-ideas/darlington-delay-light-two-bc547-capacitor/): A capacitor charges slowly through a very large resistor. Only when its voltage reaches about 1.4 V does a pair of transistors, the Darlington pair, switch the LED on, giving a timed delay. - [Eight-key toy organ with a 555 timer and a trimmer for each note](https://engineergurukul.com/resources/project-ideas/eight-key-555-toy-organ/): The pitch of a 555 astable depends on its timing resistor. Eight keys, each connecting a different resistor, give eight notes of a musical scale. - [Adjustable metronome with a 555 timer, a knob, an LED and a beep](https://engineergurukul.com/resources/project-ideas/adjustable-555-metronome-led-click/): A very slow 555 astable circuit beats like a clock. A 100 kΩ potentiometer sets the speed from about 35 to 160 beats per minute, which is useful for music practice. - [How fast a toy motor spins with one, two, three and four AA cells](https://engineergurukul.com/resources/project-ideas/toy-motor-rpm-against-voltage-cells/): The speed of a DC motor rises almost in proportion to the voltage across it. More cells in series give more speed and also a larger current. - [Plant pot dry soil alert with two steel nails, a BC547 and an LED](https://engineergurukul.com/resources/project-ideas/plant-pot-dry-soil-alert-nails-bc547/): Damp soil conducts electricity far better than dry soil. A transistor circuit lights a red LED when the soil resistance between two nails rises, which tells you the plant needs water. - [One LED used as a light sensor that switches a second LED through a BC547](https://engineergurukul.com/resources/project-ideas/led-as-light-sensor-switches-second-led/): An LED is a diode that makes light when current passes, but in strong light it also makes a small voltage itself. A transistor can use this voltage to switch another LED on, so one LED acts as a light sensor. - [Capacitor charging curve plotted from a multimeter and a stopwatch](https://engineergurukul.com/resources/project-ideas/capacitor-charging-curve-multimeter-stopwatch/): A capacitor charges quickly at first and then more slowly, following an exponential curve. The time constant RC is the time to reach about 63 percent of the supply voltage. - [Propeller thrust test: how blade angle and blade number change the push](https://engineergurukul.com/resources/project-ideas/propeller-blade-angle-thrust-balance-motor/): A propeller pushes air backwards and is pushed forwards in return. The size of the push depends on how many blades there are and how they are angled to the air. - [Car parking sensor with an Arduino whose beeps speed up as the wall nears](https://engineergurukul.com/resources/project-ideas/arduino-parking-sensor-beep-rate-ultrasonic/): An ultrasonic sensor measures distance from the time an echo takes to return. The Arduino turns this distance into LED steps and a beeping speed, like the sensor in a car bumper. - [Digital room thermometer with an LM35 and LCD showing the day’s minimum and maximum](https://engineergurukul.com/resources/project-ideas/arduino-lm35-lcd-thermometer-min-max/): The LM35 gives 10 millivolts for every degree Celsius. The Arduino reads this voltage with its analog input, converts it to degrees and shows the present, lowest and highest readings on a screen. - [Digital lap stopwatch with an Arduino, three buttons and an LCD](https://engineergurukul.com/resources/project-ideas/arduino-lap-stopwatch-lcd-three-buttons/): The millis() timer counts milliseconds since the board started. Storing the start time and subtracting it from the present value gives elapsed time, which can be shown to a hundredth of a second. - [Two-road traffic junction with an Arduino and a pedestrian crossing button](https://engineergurukul.com/resources/project-ideas/arduino-traffic-junction-pedestrian-button/): A traffic controller is a state machine: the lights follow a fixed sequence, but a pedestrian button can ask for a change. It shows how timing and input are combined in a program. - [Reaction time tester with random delay and false start detection (Arduino)](https://engineergurukul.com/resources/project-ideas/arduino-reaction-timer-false-start/): The time between a light and your button press is your reaction time, usually around 0.2 to 0.3 seconds. A microcontroller timer measures it to a thousandth of a second, so you can compare people and conditions. - [Simon memory game with four coloured LEDs, buttons and a buzzer](https://engineergurukul.com/resources/project-ideas/arduino-simon-memory-game-four-leds/): The Arduino stores a growing random sequence in an array, plays it with lights and tones, and checks the player repeats it. It teaches arrays, loops and random numbers in a game. - [Four-servo robot arm that copies the angles of four knobs](https://engineergurukul.com/resources/project-ideas/arduino-four-servo-robot-arm-potentiometer-control/): Each joint of the arm is a servo whose angle is set by a PWM signal. Reading four potentiometers and mapping each to 0 to 180 degrees lets you pose the arm by hand-turned knobs and pick up light objects. - [Hand-wave theremin: an ultrasonic sensor that plays higher notes as your hand nears](https://engineergurukul.com/resources/project-ideas/arduino-ultrasonic-theremin-hand-music/): The Arduino turns the distance of your hand into the frequency of a tone, so you can play music in the air. It shows how a sensor reading can be mapped to a sound. - [Touch-free soap dispenser with an ultrasonic sensor, relay and small pump](https://engineergurukul.com/resources/project-ideas/arduino-touchless-soap-dispenser-pump-relay/): When a hand comes within about 10 cm, the sensor detects it and the Arduino runs a small pump for a fraction of a second. It shows how sensors, relays and timers are combined in a hygiene device. - [Temperature-controlled 5 V fan with PWM speed steps and a logic-level MOSFET](https://engineergurukul.com/resources/project-ideas/arduino-temperature-stepped-pwm-fan-mosfet/): Pulse width modulation switches a fan on and off thousands of times a second; the fraction of time it is on sets the average power and speed. The Arduino raises the duty cycle as the temperature climbs, as a computer coo - [Double-clap switch for a 5 V USB lamp with a sound sensor and relay module](https://engineergurukul.com/resources/project-ideas/arduino-double-clap-lamp-sound-sensor-relay/): A sound sensor turns the loud burst of a clap into a signal. The Arduino counts claps within a time window and toggles a relay, which switches a small lamp on and off. - [Old TV remote that switches three LEDs and a servo through an IR receiver](https://engineergurukul.com/resources/project-ideas/arduino-tv-remote-ir-decode-leds-servo/): A remote control flashes an invisible infrared LED in a coded pattern, and a receiver module decodes it into a number. The Arduino can read that number and act on it, so any old remote becomes a controller for your proje - [Coin-cell LED night lamp with an ice-cream stick switch](https://engineergurukul.com/resources/project-ideas/coin-cell-led-lamp-with-stick-switch/): A complete circuit of a cell, an LED and a switch lights the lamp. It shows that current flows only in a closed loop and that an LED works in one direction only. ### Environment, Class 9 and 10 - [Rainwater harvesting model](https://engineergurukul.com/resources/project-ideas/rainwater-harvesting/): Rain falling on a roof is collected by gutters and pipes, filtered, and either stored in a tank or sent down a recharge pit to refill the groundwater. - [Solar water heater model](https://engineergurukul.com/resources/project-ideas/solar-water-heater/): Black surfaces absorb more sunlight than shiny or white ones, and a clear cover traps the heat, so water in a black, covered container warms fastest. - [Greenhouse effect in a jar](https://engineergurukul.com/resources/project-ideas/greenhouse-effect-jar/): A covered jar in the sun warms faster than an open one. It is a simple model of how greenhouse gases keep heat near the Earth; the real atmosphere traps heat by absorbing infrared rather than by stopping air moving. - [Biogas plant model](https://engineergurukul.com/resources/project-ideas/biogas-plant/): Without air, microbes break down dung and kitchen waste and give off biogas, which is mostly methane. The slurry left behind is good manure. - [Box-type solar cooker](https://engineergurukul.com/resources/project-ideas/box-solar-cooker/): The black inside absorbs sunlight, a mirror reflector sends more light in, and a glass lid traps the heat, so the box gets hot enough to warm food. - [Vermicompost tub that turns kitchen peels into worm castings](https://engineergurukul.com/resources/project-ideas/vermicompost-tub-with-earthworms/): Composting worms eat vegetable waste and pass it out as dark, crumbly castings that are a rich plant food. A tub with drainage, bedding and the right moisture turns a family's peels into compost and shows how much kitche - [One-week plastic audit of a household with a bar chart of sources](https://engineergurukul.com/resources/project-ideas/one-week-household-plastic-audit/): Counting and weighing every piece of plastic a family throws away in a week shows where it comes from: packaging of snacks, milk pouches, carry bags and bottles. Sorting it by type and by whether it can be recycled shows - [How much rain your roof can catch: a measured roof yield study](https://engineergurukul.com/resources/project-ideas/roof-rainwater-yield-calculator/): The water a roof can harvest equals roof area times rainfall times a runoff factor. Measuring a real roof and using the local annual rainfall shows that even a small house in a 800 millimetre rainfall town can collect te - [Home energy audit using the meter, appliance labels and a week of logs](https://engineergurukul.com/resources/project-ideas/home-energy-audit-from-the-meter/): Reading the electricity meter daily and logging how long each appliance runs shows which ones use most of the units. In most homes a few items, such as the geyser, air conditioner, old refrigerator and ceiling fans runni - [LED, CFL and filament bulb: cost of light over ten years from the labels](https://engineergurukul.com/resources/project-ideas/led-cfl-bulb-cost-comparison/): Three bulbs giving the same brightness draw very different power: about 60 watts for a filament bulb, 14 for a CFL and 9 for an LED. Using the lumens and watts printed on the packs and the price per unit from a bill, a t - [Is our rain acidic? Testing rainwater pH at three locations](https://engineergurukul.com/resources/project-ideas/rainwater-ph-across-the-town/): Clean rain is slightly acidic, around pH 5.6, because carbon dioxide dissolves in it. Sulphur and nitrogen oxides from vehicles and industry make it more acidic. Collecting rain in clean containers at three sites and tes - [Noise map of your neighbourhood with a phone decibel meter](https://engineergurukul.com/resources/project-ideas/noise-survey-with-a-phone-meter/): Sound level is measured in decibels, a scale where every 10 decibels sounds about twice as loud. Measuring at the same spots at different times of day gives a noise map that shows where and when levels pass the limits se - [Tree census of the school ground with species, girth and shade area](https://engineergurukul.com/resources/project-ideas/school-tree-census-with-girth/): A census records every tree in an area with its species, girth and canopy, the same way city forest departments do. The data show which species dominate, which trees are oldest, how much ground is shaded, and where new t - [Carbon footprint of the journey to school: petrol, bus, bicycle and walking](https://engineergurukul.com/resources/project-ideas/carbon-footprint-of-travel-to-school-by-fuel/): Burning fuel makes carbon dioxide, a greenhouse gas. By linking distance, mileage and fuel type you can estimate how much CO2 each way of getting to school sends into the air. - [Urban heat island: temperatures on road, roof, grass and under a tree](https://engineergurukul.com/resources/project-ideas/urban-heat-island-surface-temperature-transect/): Dark paved surfaces absorb more sunlight and warm up more than grass or shade. Mapping temperatures across a school or street shows how towns become hotter than the countryside. - [Dissolved solids in ten water sources measured with a TDS meter](https://engineergurukul.com/resources/project-ideas/tds-survey-of-drinking-water-sources/): Water carries dissolved salts that conduct electricity. A TDS meter reads the conductivity and converts it into parts per million, so different sources can be compared. - [How fast does rain soak in? Infiltration rate with a tin-can ring](https://engineergurukul.com/resources/project-ideas/soil-infiltration-rate-tin-can-ring/): Soil takes in water at a certain speed, called its infiltration rate. Measuring it in the playground, a field and a forest floor shows why some ground floods while other ground soaks up the monsoon. - [How strong is sunshine? Watts per square metre from a blackened katori](https://engineergurukul.com/resources/project-ideas/solar-irradiance-from-heating-water-in-a-black-can/): Sunlight carries energy. By measuring how fast the sunshine warms a known mass of water, you can estimate the power per square metre that reaches the ground, which is a guide to solar energy. - [Evaporation from pans in sun, shade and wind: millimetres a day](https://engineergurukul.com/resources/project-ideas/pan-evaporation-sun-shade-wind-crop-water-need/): Water leaves open surfaces at a rate set by heat, wind and humidity. Daily readings from identical pans show how much water a field or a tank loses and why crops need irrigation in summer. - [Weighing a fortnight of food waste: what we throw away and why](https://engineergurukul.com/resources/project-ideas/weekly-food-waste-weigh-in-household-or-canteen/): Food thrown away takes land, water and energy to produce, and it makes methane when it rots in a landfill. Weighing waste every day shows how much is wasted and where it comes from. - [Bowl and cup solar still that separates fresh water from salt water](https://engineergurukul.com/resources/project-ideas/bowl-and-cup-solar-still-for-drinking-water/): Water evaporates in the sun and condenses on cool plastic, leaving salt behind. It is a small model of how the water cycle and distillation work. - [How many litres does your family use in a day? A water audit](https://engineergurukul.com/resources/project-ideas/family-daily-water-use-audit-litres-per-person/): You measure how much water each daily activity uses by counting buckets, mugs and tap flows, and then work out litres per person per day. The result helps find where water can be saved. - [Foil panel solar cooker that warms a pot of water](https://engineergurukul.com/resources/project-ideas/foil-panel-solar-cooker-warms-a-pot/): A panel cooker uses flat foil-covered reflectors to bounce extra sunlight onto a dark pot sealed in a clear bag. It shows that sunlight can heat water without any fuel. - [Solar still in a basin that separates fresh water from salty water](https://engineergurukul.com/resources/project-ideas/solar-still-bottle-makes-drinking-water/): Sunlight evaporates water from salty or muddy water, and the vapour condenses on a cool plastic sheet as water with the salt left behind. It models how free heat can separate fresh water from sea or borewell water. - [Solar dryer cabinet against open-air drying of chilli and fruit](https://engineergurukul.com/resources/project-ideas/solar-dryer-cabinet-for-chilli-and-fruit/): A covered, ventilated box dries food faster and cleaner than open-air drying. Weighing equal slices each day shows how quickly water leaves in each method. - [Paper and sawdust briquettes: how long do they burn compared with wood?](https://engineergurukul.com/resources/project-ideas/paper-and-sawdust-fuel-briquettes-burn-test/): Waste paper, sawdust and crop leaves can be pressed into fuel blocks. Burning equal masses under adult supervision and timing a water boil shows the energy in each fuel. - [Tin-can rocket stove model that boils water with a handful of twigs](https://engineergurukul.com/resources/project-ideas/tin-can-rocket-stove-boils-water-with-twigs/): A rocket stove has an insulated chimney and a small fuel feed so the fuel burns hot and clean. Comparing the boil time against a three-stone fire shows how a design change saves fuel. - [Classroom lighting audit: lux readings and how much LEDs would save](https://engineergurukul.com/resources/project-ideas/classroom-lighting-audit-lux-readings-and-led-saving/): Measuring light levels and counting lamp hours shows where electricity is wasted. Comparing old tube lights with LED tubes on paper gives the units and rupees saved per year. - [Straw, leaf, paper and bare soil: which mulch keeps pots moistest?](https://engineergurukul.com/resources/project-ideas/mulch-types-and-soil-moisture-in-pots/): A layer of mulch slows evaporation from the soil surface. Weighing identical pots each day shows how much water each mulch saves, which helps farmers during dry spells. - [Greywater reuse: rice-wash, soapy and tap water on bean seedlings](https://engineergurukul.com/resources/project-ideas/greywater-reuse-soapy-rice-wash-and-tap-water-on-seedlings/): Water used in the kitchen can sometimes be reused on plants, but soap can harm them. Growing seedlings with different kinds of used water shows which can be safely reused. - [Polyhouse tunnel against open bed: temperature, humidity and seedling growth](https://engineergurukul.com/resources/project-ideas/polyhouse-tunnel-against-open-bed-temperature-and-growth/): A plastic tunnel holds warmth and moisture and protects plants from wind and rain. Comparing a covered bed with an open bed shows how polyhouses extend the growing season. - [Terraces and contour furrows against straight slopes: runoff model](https://engineergurukul.com/resources/project-ideas/terraces-and-contour-furrows-cut-runoff-model/): Terracing and ploughing along the contours slow rain runoff and hold soil on hillsides. A sand tray model measures the soil and water lost on each slope. - [Five home water cleaning methods ranked with a clarity tube](https://engineergurukul.com/resources/project-ideas/five-home-water-cleaning-methods-ranked-by-clarity/): Cloth, sand, charcoal, alum and boiling each do different jobs. A homemade clarity tube ranks how well each method clears water, and the project explains which methods also remove germs. - [Sunlight bottle disinfection model: temperature in clear, black-backed and shaded bottles](https://engineergurukul.com/resources/project-ideas/sunlight-bottle-disinfection-temperature-test/): The solar disinfection (SODIS) method leaves clear water in sunlight for hours so heat and ultraviolet light weaken germs. Measuring temperature in different bottle set-ups shows how to make it work better. - [Recharge pit model that refills a borewell tube from roof water](https://engineergurukul.com/resources/project-ideas/recharge-pit-model-refills-a-borewell-tube/): Roof rain can be led through a filter pit into the ground to raise the water table. The model shows how a recharge pit with gravel and sand layers refills a borewell. - [Cutting pond evaporation with shade, floating balls and an oil film](https://engineergurukul.com/resources/project-ideas/cutting-pond-evaporation-shade-floating-balls-and-oil-film/): Open ponds and tanks lose a lot of water by evaporation in summer. Testing four covers on trays of water shows which method saves the most water. - [Litres per kilo of rice, wheat and vegetables: a virtual water table](https://engineergurukul.com/resources/project-ideas/litres-per-kilo-of-rice-wheat-and-vegetables-virtual-water-table/): Growing food uses a lot of water. Collecting published figures and farm data for crops shows which foods use the most water and how a family’s diet affects its water footprint. ### Computing and coding, Class 9 and 10 - [Scratch pen rangoli: rotating squares make a flower](https://engineergurukul.com/resources/project-ideas/scratch-pen-rangoli-pattern-with-nested-loops/): A loop inside a loop draws a square 36 times, each turned a little, and the result is a rangoli-like flower. It shows how repeating a simple shape with a small turn builds complex patterns. - [Scratch flying-bird game with gravity and moving pipes](https://engineergurukul.com/resources/project-ideas/scratch-flappy-bird-style-gravity-game/): A speed variable that keeps decreasing acts like gravity, and a key press resets it upward. It teaches how simple rules about speed produce natural-looking motion. - [Scratch analogue clock that shows the real time](https://engineergurukul.com/resources/project-ideas/scratch-analogue-clock-with-sensing-block/): Three hands are turned by formulas using the current hour, minute and second from the computer’s clock. It links maths on angles to coding. - [Scratch two-player pong with paddles and a bouncing ball](https://engineergurukul.com/resources/project-ideas/scratch-two-player-pong-with-bounce-direction/): The ball bounces off the walls and the paddles by changing its direction. It teaches how direction angles work and how two players share one program. - [Scratch reaction-time tester using the timer block](https://engineergurukul.com/resources/project-ideas/scratch-reaction-time-tester-with-timer/): The program waits a random time, changes the colour, and measures how long you take to press a key. It shows how the timer block measures short intervals and how a list can store results. - [Python general knowledge quiz using a dictionary](https://engineergurukul.com/resources/project-ideas/python-quiz-game-with-dictionary-and-score/): A dictionary stores questions with their answers, a for loop asks them one by one, and an if statement compares answers. It is the first full program most students write. - [Python calculator with functions and a menu loop](https://engineergurukul.com/resources/project-ideas/python-calculator-with-functions-and-menu/): Each operation is a separate function, a while loop keeps showing a menu, and an if check stops division by zero. It shows how to organise code into reusable parts. - [Python to-do list that saves tasks in a text file](https://engineergurukul.com/resources/project-ideas/python-to-do-list-saved-in-a-text-file/): Tasks are written to a file and read back, so the list is still there the next time the program runs. It teaches file handling and lists. - [Python guess-the-number game with hints and a limit](https://engineergurukul.com/resources/project-ideas/python-guess-the-number-with-hints-and-attempt-limit/): The computer picks a secret number with the random module and gives too high or too low hints. Using the hints well is a binary search, which finds a number from 1 to 100 in at most seven guesses. - [Python turtle spirograph of coloured circles](https://engineergurukul.com/resources/project-ideas/python-turtle-spirograph-colour-art/): Python’s turtle module draws on a window. Drawing 72 circles with a 5 degree turn each time makes a spirograph, which shows how loops and angles create patterns. - [Python text adventure: find the lost key in the school](https://engineergurukul.com/resources/project-ideas/python-text-adventure-lost-in-school-building/): A dictionary of rooms links each place to the others, and a loop moves the player between them. It shows how data structures can describe a whole game world. - [Python daily diary that adds dated entries to a file](https://engineergurukul.com/resources/project-ideas/python-diary-logger-with-date-and-file-reading/): The program appends each entry with today’s date to a file and can print the whole diary. It teaches the date module and the append and read modes of files. - [Python analysis of class marks from a CSV file](https://engineergurukul.com/resources/project-ideas/python-class-marks-analysis-from-csv-file/): The program reads marks from a CSV file and finds the mean, median, highest, lowest and pass percentage. It shows how code can analyse data that a spreadsheet also holds. - [Python chatbot that replies using keyword rules](https://engineergurukul.com/resources/project-ideas/python-rule-based-chatbot-with-keywords/): The bot scans your sentence for keywords and picks a stored reply. It shows how simple chatbots work and why they fail on things they have no rule for, which is a good lesson for AI literacy. - [Python rock paper scissors with a rules dictionary](https://engineergurukul.com/resources/project-ideas/python-rock-paper-scissors-with-win-rules-table/): The computer picks randomly and a dictionary stores what beats what, so the winner is found without a long list of if statements. It shows how data can replace repeated code. - [Python password strength checker using made-up passwords](https://engineergurukul.com/resources/project-ideas/python-password-strength-checker-for-practice-words/): The program scores a password on length, capital letters, small letters, digits and symbols. It shows how longer and mixed passwords are harder to guess and how string methods work. - [Python unit converter for length, mass and temperature](https://engineergurukul.com/resources/project-ideas/python-unit-converter-menu-length-mass-temperature/): The program converts between units using stored factors and the Celsius to Fahrenheit formula. It combines maths with menus and functions. - [Python hangman game with a word list and six lives](https://engineergurukul.com/resources/project-ideas/python-hangman-with-word-list-and-lives/): A set stores guessed letters, a join expression shows the word with blanks and a lives counter ends the game. It combines strings, sets, loops and conditions in one program. - [Python bill generator for a kirana shop](https://engineergurukul.com/resources/project-ideas/python-kirana-shop-bill-generator-with-discount/): A price dictionary and a loop build a neat bill with totals and a discount rule. It shows how everyday billing can be programmed with formatted output. - [Python turtle drawing of the Indian tricolour with chakra](https://engineergurukul.com/resources/project-ideas/python-turtle-drawing-of-the-indian-tricolour/): A function draws filled rectangles and a loop draws 24 spokes, so the flag is built from geometry and code. It shows how functions and loops reduce repetition. - [Python summary of monthly rainfall with a text bar chart](https://engineergurukul.com/resources/project-ideas/python-monthly-rainfall-data-summary-and-text-chart/): The program stores 12 monthly rainfall values, finds the wettest month and the average, and draws a bar of hash signs for each month. It shows basic data analysis with lists. - [Python Caesar cipher with a brute-force code breaker](https://engineergurukul.com/resources/project-ideas/python-caesar-cipher-encoder-decoder-and-code-breaker/): Each letter is shifted by a key along the alphabet, and trying all 25 keys breaks the code. It shows how simple ciphers work and why they are weak. - [Python word counter that finds the ten most common words](https://engineergurukul.com/resources/project-ideas/python-word-frequency-counter-for-a-text-file/): The program reads a text file, cleans the words and counts them in a dictionary. It shows how text analysis works and which words dominate ordinary writing. - [Python tic-tac-toe for two players with a win checker](https://engineergurukul.com/resources/project-ideas/python-tic-tac-toe-two-players-with-win-check/): A list of nine cells holds the board and a list of eight winning lines is checked after each move. It shows how to model a game with data. - [HTML personal home page with a photo, list and links](https://engineergurukul.com/resources/project-ideas/html-personal-home-page-with-headings-lists-and-links/): A web page is a text file with tags that tell the browser what each part is. This project builds a first page using headings, paragraphs, an image, a list and links. - [HTML and CSS one-page online resume](https://engineergurukul.com/resources/project-ideas/html-css-one-page-online-resume-for-a-student/): HTML gives the structure of a resume with sections, and CSS styles fonts, colours and spacing in a separate file. It shows how content and design are kept apart. - [HTML recipe page for poha with ingredient and step lists](https://engineergurukul.com/resources/project-ideas/html-recipe-page-for-poha-with-ordered-and-unordered-lists/): Ingredients go in an unordered list and the method in an ordered list, so the browser numbers the steps automatically. It shows how to choose the right tag for the meaning. - [HTML and CSS school magazine front page with columns](https://engineergurukul.com/resources/project-ideas/html-css-school-magazine-front-page-with-columns/): Semantic tags and CSS columns lay out an article like a newspaper page. It teaches page structure and layout with real content. - [HTML and CSS photo gallery with flexbox and hover zoom](https://engineergurukul.com/resources/project-ideas/html-css-photo-gallery-with-flexbox-and-hover-zoom/): Flexbox arranges images in a wrapping grid, and a hover rule enlarges the image under the cursor. It shows modern CSS layout without tables. - [HTML class timetable with merged cells and striped rows](https://engineergurukul.com/resources/project-ideas/html-class-timetable-table-with-colspan-and-zebra-rows/): An HTML table with rows, headings and merged cells shows a weekly timetable, and CSS stripes the rows for easy reading. It teaches tables, colspan and the nth-child selector. - [HTML contact form with required fields and a dropdown](https://engineergurukul.com/resources/project-ideas/html-contact-form-with-validation-attributes/): Form tags collect text, a choice and a message, and HTML attributes check the input before sending. It shows how websites collect information. - [CSS navigation bar linking a three-page website](https://engineergurukul.com/resources/project-ideas/css-navigation-bar-with-hover-and-active-page/): A list of links is turned into a horizontal menu using flexbox, with hover and active-page colours. It shows how a real website’s menu is made from simple lists. - [CSS animated Diwali card with a flickering diya](https://engineergurukul.com/resources/project-ideas/css-animated-diwali-greeting-card-with-flickering-diya/): CSS keyframes make a flame flicker and a greeting fade in with no JavaScript. It shows how animation is described by start and end states. - [HTML page with a dark mode button that remembers your choice](https://engineergurukul.com/resources/project-ideas/html-dark-mode-toggle-button-remembering-choice/): A button runs a few lines of JavaScript that switch a CSS class, and localStorage keeps the choice for the next visit. It is a first step from static pages to interactive ones. - [Spreadsheet monthly household budget with over-budget checks](https://engineergurukul.com/resources/project-ideas/spreadsheet-household-monthly-budget-with-sum-and-checks/): A planned and an actual column are compared with formulas that give the difference and warn when spending exceeds the plan. It teaches the basics of budgeting and spreadsheet formulas. - [Spreadsheet marksheet with total, percentage, grade and result](https://engineergurukul.com/resources/project-ideas/spreadsheet-marksheet-with-total-percentage-grade-and-result/): Formulas work out each student’s total, percentage, grade and pass or fail, and nested IF handles the grade bands. It shows how report cards can be calculated automatically. - [Spreadsheet attendance register using COUNTIF](https://engineergurukul.com/resources/project-ideas/spreadsheet-attendance-register-with-countif-and-75-percent-alert/): Present and absent entries are counted with COUNTIF, converted to a percentage, and flagged when below 75 percent. It shows how formulas can replace manual counting. - [Spreadsheet survey: pie chart of how classmates travel to school](https://engineergurukul.com/resources/project-ideas/spreadsheet-pie-chart-of-how-classmates-travel-to-school/): Survey answers are counted with COUNTIF and shown as a pie chart with percentages. It teaches data collection, counting and choosing the right chart. - [Spreadsheet pocket money tracker with a running balance](https://engineergurukul.com/resources/project-ideas/spreadsheet-pocket-money-tracker-with-running-balance-and-line-chart/): A running balance formula adds income and subtracts spending on every row, and a line chart shows how the balance changes over the month. It teaches saving habits and cell references. - [Spreadsheet electricity bill estimator with unit slabs](https://engineergurukul.com/resources/project-ideas/spreadsheet-electricity-bill-estimator-with-slab-rates/): A single formula with MIN and MAX charges different rates for each block of units, as slab billing does. It shows how step-rate pricing works and how to check it. - [Spreadsheet comparing simple and compound interest over 20 years](https://engineergurukul.com/resources/project-ideas/spreadsheet-simple-and-compound-interest-comparison-chart/): Two formulas grow the same sum at the same rate, one adding the same interest each year and one adding interest on interest. The chart shows compounding pulling ahead with time. - [Spreadsheet temperature heat map for a month](https://engineergurukul.com/resources/project-ideas/spreadsheet-temperature-heat-map-with-conditional-colours/): Daily maximum temperatures are coloured from cool to hot with a colour scale and summarised with AVERAGE, MAX and MIN. It shows how colour helps people see patterns in numbers. - [Spreadsheet sports day scoreboard using SUMIF](https://engineergurukul.com/resources/project-ideas/spreadsheet-sports-day-house-scoreboard-with-sumif/): Points from many events are added for each house with SUMIF, ranked and drawn as a bar chart. It shows how one list of results can produce a summary. - [Digital safety survey: how classmates handle passwords](https://engineergurukul.com/resources/project-ideas/digital-safety-survey-of-classmates-password-habits/): An anonymous survey of habits, such as sharing passwords or reusing one everywhere, gives percentages and a bar chart. It shows which habits put accounts at risk and how to improve them. - [Digital safety test: can friends spot fake messages?](https://engineergurukul.com/resources/project-ideas/digital-safety-spot-the-phishing-message-sorting-test/): A set of made-up messages, some genuine-looking and some fake, is sorted by friends using a checklist, and the results show which tricks work best. It teaches how to recognise phishing and scam messages. - [Digital wellbeing: a one-week screen-time diary and plan](https://engineergurukul.com/resources/project-ideas/digital-wellbeing-screen-time-diary-for-one-week/): Daily screen time for study, play and chat is logged for a week, averaged and charted, then a plan is made and tested. It teaches self-observation and healthy habits with data. - [Media literacy: check five forwarded messages before sharing](https://engineergurukul.com/resources/project-ideas/media-literacy-check-five-forwarded-messages-before-you-share/): Forwarded claims are checked with a three-step method: who says it, when, and what do reliable sources say. It teaches how to stop false information from spreading. - [AI literacy: testing a chatbot with twenty checkable questions](https://engineergurukul.com/resources/project-ideas/ai-literacy-test-how-accurate-is-a-chatbot-on-twenty-questions/): Twenty questions with known answers are put to an AI chatbot and the answers are checked against textbooks, giving an accuracy percentage and a list of confident mistakes. It shows that AI can be useful but must be verif - [AI literacy: train an image classifier on stationery items](https://engineergurukul.com/resources/project-ideas/ai-literacy-train-an-image-classifier-with-teachable-machine/): A free browser tool learns to tell a pencil, an eraser and a sharpener from webcam examples, and testing shows how the number and variety of examples change accuracy. It teaches how machine learning learns from data. - [Digital privacy audit of app permissions with a parent](https://engineergurukul.com/resources/project-ideas/digital-privacy-audit-of-app-permissions-on-a-family-phone/): Apps on a phone are checked for the permissions they hold, such as camera, microphone and location, and compared with what they need. It teaches how to protect privacy by limiting access. - [AI literacy: can classmates tell AI-written text from student writing?](https://engineergurukul.com/resources/project-ideas/ai-literacy-can-classmates-tell-ai-text-from-student-writing/): Short paragraphs written by students and by an AI tool are mixed and shown to volunteers who guess the author. The results show how hard it is to tell and what clues people use. - [Paper flowchart for an ATM withdrawal with three PIN tries](https://engineergurukul.com/resources/project-ideas/flowchart-for-an-atm-cash-withdrawal-with-pin-retries/): A flowchart with decision diamonds and a loop describes the steps of an ATM withdrawal, including three PIN attempts and a balance check. It shows how to plan an algorithm before coding it. - [Sorting number cards by hand: bubble sort against selection sort](https://engineergurukul.com/resources/project-ideas/sorting-number-cards-by-hand-bubble-versus-selection/): Eight number cards are sorted by two methods while counting comparisons and swaps. It shows how different algorithms reach the same answer with different amounts of work. - [Binary number cards that count from 0 to 31 on paper](https://engineergurukul.com/resources/project-ideas/binary-number-cards-count-from-zero-to-thirty-one/): Five cards with dots for 1, 2, 4, 8 and 16 show any number up to 31 by turning cards face up or down. It teaches how computers store numbers using only on and off, which are the digits 1 and 0. - [Binary search against linear search on a sorted roll-number list](https://engineergurukul.com/resources/project-ideas/binary-search-against-linear-search-on-a-sorted-list-of-roll-numbers/): Looking for a roll number in a sorted list is done one by one and then by halving, and the steps are counted. It shows why binary search is so much faster for large lists. - [Python explorer: prime sieve and Fibonacci golden ratio](https://engineergurukul.com/resources/project-ideas/python-prime-numbers-sieve-and-fibonacci-ratio-explorer/): One program finds primes with the Sieve of Eratosthenes and generates Fibonacci numbers whose consecutive ratio settles near 1.618. It links number patterns to loops and lists. ### Physics, Class 11 and 12 - [AC generator (electromagnetic induction)](https://engineergurukul.com/resources/project-ideas/ac-generator/): When a coil turns in a magnetic field, the changing magnetic field through it induces a current (Faraday’s law). The current reverses every half turn, which is alternating current. - [Light trapped in a stream of water](https://engineergurukul.com/resources/project-ideas/light-in-a-water-stream/): Light inside the water meets the surface at a large angle and is totally internally reflected, so it follows the curved stream. Optical fibres carry internet signals the same way. - [Full wave bridge rectifier](https://engineergurukul.com/resources/project-ideas/full-wave-rectifier/): Four diodes arranged as a bridge send current through the load in the same direction on both halves of the AC cycle, turning AC into pulsating DC. A capacitor smooths the output. - [Logic gates with diodes and a transistor](https://engineergurukul.com/resources/project-ideas/logic-gates/): Two diodes and a resistor make AND and OR gates, and a transistor makes a NOT gate. Switches give the inputs and an LED shows the output, matching each gate’s truth table. - [Transformer working model](https://engineergurukul.com/resources/project-ideas/transformer-model/): Alternating current in the primary coil makes a changing magnetic field in the iron core, which induces a voltage in the secondary coil (mutual induction). In an ideal transformer the voltages are in the same ratio as th - [Magnet falling through a copper pipe (Lenz’s law)](https://engineergurukul.com/resources/project-ideas/magnet-in-copper-pipe/): A falling magnet induces eddy currents in the copper pipe. By Lenz’s law these currents make a magnetic field that opposes the motion, so the magnet falls far more slowly than a non-magnetic object. - [Refractive index of liquids by real and apparent depth](https://engineergurukul.com/resources/project-ideas/refractive-index-of-liquids/): A coin under water looks raised when seen from directly above, because light bends as it leaves the water. The refractive index is the real depth divided by the apparent depth, so different liquids give different values. - [Footstep power with piezo discs](https://engineergurukul.com/resources/project-ideas/piezo-footstep-power/): Piezoelectric discs make a small voltage when they are pressed. Many discs under a tile, with a rectifier and a capacitor, can light LEDs, though the energy from each step is very small. - [How resistance changes with the length and thickness of nichrome wire](https://engineergurukul.com/resources/project-ideas/resistance-against-wire-length-and-thickness/): The resistance of a wire is directly proportional to its length and inversely proportional to its area of cross section (R = rho L / A). Doubling the length doubles R, and joining two equal wires side by side in parallel - [Internal resistance and emf of a dry cell from a V-I graph](https://engineergurukul.com/resources/project-ideas/internal-resistance-of-a-dry-cell-graph/): The terminal voltage of a cell falls as it supplies more current because of its internal resistance, following V = E minus I r. A graph of V against I is a straight line whose intercept is the emf E and whose slope is mi - [Conductivity of salt water against concentration with two carbon rods](https://engineergurukul.com/resources/project-ideas/salt-water-conductivity-against-concentration/): Pure water barely conducts, but dissolved salt gives free ions that carry current. The current through a salt solution rises with concentration, nearly in proportion for weak solutions and then more slowly as the ions cr - [Homopolar motor from a screw, a cell and a neodymium magnet](https://engineergurukul.com/resources/project-ideas/homopolar-motor-from-a-screw-and-a-cell/): A current flowing through a magnet in a magnetic field feels a sideways force (F = B I L), and here that force makes the magnet and screw spin at hundreds of revolutions per minute. It is the simplest motor that works wi - [Shake torch: a magnet moving through a coil lights an LED](https://engineergurukul.com/resources/project-ideas/shake-torch-faraday-induction-coil/): Moving a magnet through a coil changes the magnetic flux through it and induces an emf (Faraday’s law), which lights an LED with no cell at all. Faster shaking and more turns give a brighter flash. - [Eddy current brake: a metal plate pendulum swinging between magnets](https://engineergurukul.com/resources/project-ideas/eddy-current-pendulum-brake/): A solid aluminium or copper plate swinging between magnet poles stops within a few swings, while a slotted plate swings on, because circulating eddy currents are induced in the solid plate and Lenz’s law makes them oppos - [Thermocouple from copper and iron wire read with a multimeter](https://engineergurukul.com/resources/project-ideas/thermocouple-from-copper-and-iron-wire/): Two different metals joined at two points produce a small voltage when the two junctions are at different temperatures (the Seebeck effect). The voltage rises roughly in proportion to the temperature difference, which is - [Forward voltage of LEDs of different colours and the energy of light](https://engineergurukul.com/resources/project-ideas/led-forward-voltage-by-colour/): An LED only begins to conduct above a threshold voltage that is higher for colours of shorter wavelength: red about 1.8 V, green about 2.1 V, blue about 2.8 V for typical 5 mm LEDs. The threshold energy e V roughly equal - [Charging and discharging a capacitor: the RC time constant with a stopwatch](https://engineergurukul.com/resources/project-ideas/capacitor-charging-time-constant-with-led/): A capacitor charging through a resistor reaches 63 percent of the supply voltage after one time constant tau = R C, and discharges to 37 percent in the same time. With a large capacitor and a large resistor the process t - [Metre bridge on a plank: finding an unknown resistance by balance](https://engineergurukul.com/resources/project-ideas/metre-bridge-unknown-resistance/): A Wheatstone bridge is balanced when the galvanometer shows zero, and then the unknown resistance equals the known one multiplied by the ratio of the two wire lengths (X = R l / (100 minus l)). A home-built metre bridge - [Home-made tangent galvanometer: compass deflection against coil current](https://engineergurukul.com/resources/project-ideas/tangent-galvanometer-coil-and-compass/): A compass at the centre of a vertical coil set in the magnetic north-south plane is deflected by the coil’s field, and the tangent of the deflection angle is proportional to the current (tan theta = B_coil / B_H). This m - [Joule heating: water temperature rise against voltage](https://engineergurukul.com/resources/project-ideas/joule-heating-water-temperature-rise-and-voltage/): An electric current heats a resistor, and the heat produced in a fixed time is V squared divided by R, times t. Doubling the voltage on the same coil makes it deliver four times the heat. - [Maximum power from a cell: power against load resistance graph](https://engineergurukul.com/resources/project-ideas/maximum-power-transfer-load-resistance-graph/): A cell delivers the most power to a load when the load resistance equals the cell’s own internal resistance. The power curve rises, peaks and falls as the load is changed. - [Potential divider: output voltage from a pencil lead and an LDR](https://engineergurukul.com/resources/project-ideas/potential-divider-pencil-lead-and-ldr-output/): Two resistors in series share the cell’s voltage in proportion to their resistances. Replacing one with an LDR makes the output voltage change with light, which is how many sensors work. - [Diode V-I characteristic with cells: forward knee and reverse leakage](https://engineergurukul.com/resources/project-ideas/diode-forward-and-reverse-characteristic-with-cells/): A silicon diode conducts almost nothing until the forward voltage reaches about 0.6 to 0.7 V, then the current rises steeply. In reverse it passes almost no current. - [Slide-wire potentiometer to compare the emf of two cells](https://engineergurukul.com/resources/project-ideas/slide-wire-potentiometer-comparing-cell-emfs/): On a uniform wire carrying a steady current, the voltage falls evenly along its length. The balance lengths for two cells are in the same ratio as their emfs, and no current is drawn from the cells at balance. - [Force on a current carrying wire: swinging foil strip in a magnet gap](https://engineergurukul.com/resources/project-ideas/force-on-a-current-carrying-wire-swinging-foil-in-a-magnet/): A wire carrying current in a magnetic field feels a sideways push, F = B I L. Reversing the current or the magnet reverses the push, as Fleming’s left-hand rule says. - [How a bar magnet’s field falls with distance: compass log graph](https://engineergurukul.com/resources/project-ideas/bar-magnet-field-against-distance-compass-log-graph/): Far from a magnet the field along its axis falls roughly as the cube of the distance. A compass needle’s deflection, compared with the Earth’s field, lets you check this from a log graph. - [Torch bulb V-I curve: why a hot filament is not ohmic](https://engineergurukul.com/resources/project-ideas/torch-bulb-v-i-curve-filament-resistance-rises/): A bulb’s filament gets hotter as the current rises, and a hotter metal resists more. The graph of voltage against current therefore bends and the bulb does not obey Ohm’s law. - [Kirchhoff’s current and voltage laws on a two-loop resistor board](https://engineergurukul.com/resources/project-ideas/kirchhoff-laws-verified-on-a-two-loop-resistor-board/): At any junction the currents entering equal the currents leaving, and round any closed loop the voltages add to zero. A two-loop board with two cells shows both laws with measured values. - [Induced emf against magnet speed: dropping a magnet through a coil](https://engineergurukul.com/resources/project-ideas/induced-emf-against-magnet-speed-falling-through-a-coil/): Faraday’s law says the emf in a coil equals the rate of change of magnetic flux. A magnet falling faster through the same coil gives a larger voltage pulse. - [Convex lens focal length from a u-v graph on a metre rule bench](https://engineergurukul.com/resources/project-ideas/convex-lens-focal-length-from-a-u-v-graph/): A convex lens forms a real, inverted image on a screen at a distance that depends on where the object is. The lens formula links the two distances to the focal length, and a graph of 1/v against 1/u gives f accurately. - [Bessel’s displacement method: focal length without finding the lens centre](https://engineergurukul.com/resources/project-ideas/bessel-displacement-method-lens-focal-length/): If an object and a screen are further apart than four focal lengths, there are two lens positions that give a sharp image. The distance between them gives f from f = (D² − d²) / 4D. - [Concave mirror: where the image forms and how big it is](https://engineergurukul.com/resources/project-ideas/concave-mirror-image-positions-and-magnification-table/): The size, position and nature of the image in a concave mirror change as the object moves from far away to inside the focal length. The mirror formula and magnification can be checked with real readings. - [Critical angle of water: the vanishing pin under a floating disc](https://engineergurukul.com/resources/project-ideas/critical-angle-of-water-with-a-floating-pin-disc/): Rays from an object under water that meet the surface at more than the critical angle are totally reflected and cannot leave. A disc on the surface can hide a pin completely when its radius is large enough, which gives t - [Glass slab pin method: Snell’s law from a sin i against sin r graph](https://engineergurukul.com/resources/project-ideas/glass-slab-pin-method-snells-law-sine-graph/): Light going from air into glass bends toward the normal so that sin i / sin r is a constant, the refractive index. A graph of sin i against sin r for several angles has a slope equal to that index. - [Glass prism: angle of deviation against angle of incidence curve](https://engineergurukul.com/resources/project-ideas/glass-prism-minimum-deviation-i-d-curve/): A ray bent by a prism is deviated by an angle D that first falls and then rises as the angle of incidence increases, with a minimum in the middle. The refractive index follows from the minimum deviation and the prism ang - [Two-lens compound microscope model with measured magnification](https://engineergurukul.com/resources/project-ideas/two-lens-compound-microscope-model-with-measured-magnification/): A short focal length objective makes a magnified real image, and a second lens, the eyepiece, magnifies that image again. The total magnification is the product of the two. - [Two-lens astronomical telescope: magnifying power equals f0 divided by fe](https://engineergurukul.com/resources/project-ideas/two-lens-astronomical-telescope-with-magnifying-power-check/): A long focal length objective and a short focal length eyepiece make a refracting telescope. In normal adjustment its angular magnification is f0 / fe. - [Two polarising filters: Malus’s law with a phone light sensor](https://engineergurukul.com/resources/project-ideas/two-polarising-filters-malus-law-with-a-phone-light-sensor/): Light passing through a second polarising filter is cut down by cos² of the angle between the two filters’ axes. Measuring the light level against the angle verifies Malus’s law. - [Measuring the track spacing of a CD with a laser pointer](https://engineergurukul.com/resources/project-ideas/cd-track-spacing-from-laser-pointer-diffraction/): A CD’s closely spaced tracks act as a reflection diffraction grating. A laser pointer makes spots on a wall whose angles give the spacing of the tracks, about 1.6 micrometres, from d sin θ = n λ. - [Inverse square law of light with an LED and a phone lux meter](https://engineergurukul.com/resources/project-ideas/inverse-square-law-of-light-led-and-phone-lux-meter/): The brightness of a small light source falls with the square of the distance. Doubling the distance cuts the light to a quarter. - [Newton’s law of cooling: temperature curve and ln graph of hot water](https://engineergurukul.com/resources/project-ideas/newtons-law-of-cooling-ln-graph-of-hot-water/): A hot body cools at a rate proportional to its excess temperature over the surroundings. A graph of the natural log of the excess temperature against time is a straight line. - [Specific heat of metal pieces by the method of mixtures](https://engineergurukul.com/resources/project-ideas/specific-heat-of-metal-pieces-by-method-of-mixtures/): Different metals need different amounts of heat to warm by one degree. Dropping hot metal into cool water and measuring the final temperature gives the metal’s specific heat. - [Butter dabs on metal rods: which metal conducts heat best](https://engineergurukul.com/resources/project-ideas/butter-dabs-on-metal-rods-comparing-heat-conduction/): When one end of equal rods is heated, the heat travels along each at a different speed. Dabs of butter melt in order along the rod, showing which metal is the better conductor. - [Latent heat of fusion of ice by mixing with warm water](https://engineergurukul.com/resources/project-ideas/latent-heat-of-fusion-of-ice-by-mixing-with-warm-water/): Melting ice absorbs a lot of heat without changing temperature. Mixing ice at 0 degrees C, wiped dry, into warm water and measuring the final temperature gives the latent heat of fusion, about 334 joules per gram. - [Linear expansion of a metal rod magnified by a rolling-needle pointer](https://engineergurukul.com/resources/project-ideas/linear-expansion-of-a-metal-rod-with-a-needle-pointer/): A metal rod lengthens by only a fraction of a millimetre when heated. A pointer fixed on a rolling needle magnifies the tiny change so that the coefficient of linear expansion can be measured. - [Resonance tube: speed of sound using a phone tone generator](https://engineergurukul.com/resources/project-ideas/resonance-tube-speed-of-sound-with-a-phone-tone/): An air column closed at one end resonates when its length is a quarter or three quarters of the wavelength. Two resonance lengths give the speed of sound without needing to know the end correction. - [Echo clapping rhythm: speed of sound from a distant wall](https://engineergurukul.com/resources/project-ideas/echo-clapping-rhythm-speed-of-sound-from-a-wall/): Sound takes time to reach a wall and return. If you clap so that each clap meets the echo of the last, the time between claps is the echo time, so speed = 2 × distance ÷ time. - [Sonometer string: frequency against length and tension](https://engineergurukul.com/resources/project-ideas/sonometer-string-frequency-against-length-and-tension/): The pitch of a stretched string rises when it is shortened or tightened. The frequency is inversely proportional to the length and proportional to the square root of the tension. - [Blowing across a bottle: Helmholtz resonance frequency against air volume](https://engineergurukul.com/resources/project-ideas/bottle-helmholtz-resonance-frequency-against-volume-of-air/): Air in a bottle with a narrow neck resonates at a frequency that falls as the bottle’s air volume gets bigger. Adding water makes the note rise. - [Chladni patterns: salt figures on a speaker-driven metal plate](https://engineergurukul.com/resources/project-ideas/chladni-plate-salt-patterns-on-a-speaker-driven-tin/): A vibrating plate has nodal lines where it stays still, and sprinkled salt collects on them to draw beautiful patterns. Each pattern belongs to one natural frequency of the plate, and higher frequencies give more complex - [Newton’s second law: trolley pulled by a falling weight](https://engineergurukul.com/resources/project-ideas/newtons-second-law-trolley-and-falling-weight-test/): The acceleration of a trolley is proportional to the force on it and inversely proportional to its mass. A falling weight pulls the trolley, and distance-time measurements give the acceleration. - [Two toy car collisions: checking momentum with slow-motion video](https://engineergurukul.com/resources/project-ideas/two-toy-car-collisions-conservation-of-momentum-video/): In a collision the total momentum of two cars is the same before and after, even though some kinetic energy is lost. Slow-motion video gives the speeds. - [Rubber band launcher: range against launch angle, maximum at 45 degrees](https://engineergurukul.com/resources/project-ideas/rubber-band-launcher-range-against-launch-angle/): A ball launched at the same speed travels farthest when the angle is about 45 degrees, and two angles that add to 90 degrees give the same range. This follows from R = v² sin 2θ / g. - [Rolling race on a slope: hollow can, solid cylinder and ball](https://engineergurukul.com/resources/project-ideas/rolling-race-hollow-cylinder-solid-cylinder-and-ball/): Objects of the same mass and radius roll down a slope at different speeds, because their mass is spread differently. The ball wins and the hollow ring comes last, and the rolling acceleration can be calculated from the m - [Whirled rubber bung: checking the centripetal force formula](https://engineergurukul.com/resources/project-ideas/whirled-rubber-bung-centripetal-force-check/): A body moving in a circle needs an inward force of m ω² r. Whirling a bung on a string with a hanging weight pulling it inwards shows that this force equals the weight. - [A marble falling in honey: viscosity from terminal speed](https://engineergurukul.com/resources/project-ideas/marble-falling-in-honey-viscosity-from-terminal-speed/): A ball falling in a thick liquid reaches a steady speed where the drag balances its weight less the buoyancy. Stokes’s law then gives the liquid’s viscosity from that speed. - [Straw hydrometer: calibrating a float to measure liquid density](https://engineergurukul.com/resources/project-ideas/straw-hydrometer-calibrated-for-milk-and-salt-water/): A weighted straw floats lower in a lighter liquid and higher in a denser one. Marking it in liquids of known density turns it into a hydrometer. - [Capillary rise of water against tube radius: Jurin’s law with glass tubes](https://engineergurukul.com/resources/project-ideas/capillary-rise-of-water-against-tube-radius-jurin-law/): Water climbs up a narrow glass tube and goes higher in a narrower one. The height is inversely proportional to the radius, and the measured heights give the surface tension of water. - [Hooke’s law and spring oscillations: T² against load graph](https://engineergurukul.com/resources/project-ideas/spring-hookes-law-and-oscillation-period-t-squared-graph/): A spring stretches in proportion to the load, and a mass hanging on it bobs up and down with a period that depends on the mass and the spring constant. The two experiments give the same spring constant. - [Finding g with a simple pendulum: T² against length graph](https://engineergurukul.com/resources/project-ideas/simple-pendulum-g-from-t-squared-against-length-graph/): The square of a pendulum’s period is proportional to its length, with slope 4π² / g. The slope of the graph gives the acceleration due to gravity at your place. - [Solar cell I-V curve: maximum power point and fill factor](https://engineergurukul.com/resources/project-ideas/solar-cell-i-v-curve-maximum-power-point-and-fill-factor/): A solar cell behaves like a current source up to a knee and then like a diode. Its power peaks at one load, the maximum power point, and the fill factor shows how close the curve is to a perfect rectangle. - [Savonius wind turbine from cans: lifting a weight at different wind speeds](https://engineergurukul.com/resources/project-ideas/savonius-wind-turbine-lifting-a-weight-power-against-fan-speed/): A vertical-axis turbine with two curved scoops spins in a wind, and the turning axle winds up a thread to lift a weight. The useful power it delivers can be compared with the power in the wind, which is ½ ρ A v³. - [Spoon Pelton wheel: output power and efficiency against water head](https://engineergurukul.com/resources/project-ideas/spoon-pelton-wheel-efficiency-against-water-head/): A jet of water hitting spoon-shaped buckets turns a wheel that lifts a weight. The power in the jet is ρ g Q H, and comparing it with the power lifting the weight gives the efficiency. - [Solar cell I-V curve and maximum power point with a potentiometer load](https://engineergurukul.com/resources/project-ideas/solar-cell-iv-curve-tracer-with-potentiometer-load/): A solar panel is not a battery: its voltage and current change with the load. By plotting current against voltage and power against voltage, a student finds the maximum power point, fill factor and effect of shading, whi - [Peltier mini cooler box: temperature drop with different heat sinks](https://engineergurukul.com/resources/project-ideas/peltier-mini-cooler-box-temperature-drop-vs-heat-sink/): Mini fridges for medicines and vaccines in remote places use Peltier modules, which pump heat electrically without gas. The project builds a small insulated box and shows that how well the hot side is cooled decides how - [DC motor torque-speed curve and back EMF measured with a rope brake](https://engineergurukul.com/resources/project-ideas/dc-motor-torque-speed-curve-and-back-emf-measurement/): Selecting a motor for a robot or pump needs its torque-speed curve and efficiency. A homemade rope brake loads a small motor with known torque, while voltage, current and rpm are measured to plot the characteristics and - [Rotating-magnet coil generator: output voltage against speed and turns](https://engineergurukul.com/resources/project-ideas/rotating-magnet-coil-generator-voltage-against-speed/): Bicycle dynamos and wind turbines make electricity from a moving magnet near a coil. The project builds a model generator and tests how peak voltage depends on the speed of rotation and the number of turns, which is Fara - [Falling magnet through a coil recorded with a phone sound card](https://engineergurukul.com/resources/project-ideas/falling-magnet-through-copper-pipe-and-coil-with-phone-recording/): A magnet dropped through a coil induces a voltage pulse, and one dropped through a copper pipe falls slowly because of eddy currents. The project records both events and measures how induced voltage depends on speed and - [Slider-crank and scotch yoke models compared for piston displacement](https://engineergurukul.com/resources/project-ideas/slider-crank-and-scotch-yoke-motion-conversion-models/): Engines, compressors and pumps convert rotation to straight-line motion. A slider-crank gives a motion that is not quite sinusoidal, and a scotch yoke gives a perfect sine. The project builds both from plywood or acrylic - [Spur gear train model testing speed ratio, torque and backlash](https://engineergurukul.com/resources/project-ideas/spur-gear-train-speed-ratio-and-torque-test-model/): Gearboxes in bicycles, clocks and winches trade speed for torque. A model gear train made from salvaged toy gears or laser-cut MDF lets a student check that the speed ratio equals the inverse of the teeth ratio and measu - [Four-bar linkage wiper mechanism and its coupler curve plotted on paper](https://engineergurukul.com/resources/project-ideas/four-bar-linkage-wiper-mechanism-with-coupler-curve-plot/): Windscreen wipers, bicycle rear suspensions and door closers use four-bar linkages. A linkage turns one motion into another through four links and four pins. The project builds a crank-rocker model, traces the path of a - [Cam and follower model: three profiles and their displacement diagrams](https://engineergurukul.com/resources/project-ideas/cam-and-follower-profile-model-with-displacement-diagram/): Engine valves and sewing machines use cams to give exact timed motion. The project cuts three cam profiles, measures the follower rise at each angle and plots a displacement diagram, which shows why the shape of the prof - [Warren truss bridge from ice-cream sticks tested to failure](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-warren-truss-bridge-load-to-failure/): Railway and road bridges use trusses because a triangle is rigid and each member carries either tension or compression. The project builds a Warren truss, loads it step by step until it fails, and compares the failure lo - [Model footing on sand: bearing load against footing width and depth](https://engineergurukul.com/resources/project-ideas/sand-footing-bearing-capacity-model-with-different-footing-widths/): Buildings stand on foundations that spread the load over soil. The project loads small square footings on a tray of sand and shows that a wider footing carries more total load, that in sand the failure pressure also tend - [Simply supported wooden beam: deflection test and Young’s modulus estimate](https://engineergurukul.com/resources/project-ideas/wooden-beam-deflection-test-and-youngs-modulus-estimate/): Floors, shelves and bridges bend under load. A strip of wood supported at both ends and loaded at the middle bends by an amount that depends on its depth, length and Young’s modulus. The project measures the deflection a - [How many clear layers does a solar heater plate need? Glazing test](https://engineergurukul.com/resources/project-ideas/glass-layers-on-a-solar-collector-test/): A clear cover over a black plate lets sunlight in and slows heat from escaping. Testing zero, one and two layers shows the benefit and the point where extra layers stop helping. - [Two, three, four or six blades: which rotor turns a dynamo best?](https://engineergurukul.com/resources/project-ideas/blade-number-and-pitch-wind-rotor-comparison/): The number and angle of blades change how much electricity a small wind rotor makes. Measuring voltage for each design under the same fan shows the best design for a fixed wind speed. - [Small solar cells in series and in parallel, with one cell shaded](https://engineergurukul.com/resources/project-ideas/solar-cells-in-series-and-parallel-with-partial-shade/): Joining cells in series adds voltage, while joining them in parallel adds current. Shading one cell shows why a single shaded cell can cut the power of a whole panel. - [Windmill pump model that lifts water with a crank and syringe](https://engineergurukul.com/resources/project-ideas/windmill-water-pump-model-lifts-water-with-bottle-blades/): A windmill pump turns the spin of its blades into an up and down stroke that lifts water. It shows how farmers use wind to irrigate fields with no electricity. - [Drip emitter flow against reservoir height: pressure head test](https://engineergurukul.com/resources/project-ideas/drip-emitter-flow-against-reservoir-height/): The rate at which a drip emitter releases water depends on the height of the water above it. Measuring drops per minute at different heights shows the link between pressure and flow, which a farmer uses to design a drip - [Gravity dam profile model: why the base is thick and the top thin](https://engineergurukul.com/resources/project-ideas/gravity-dam-profile-model-thrust-and-stability/): Water pressure grows with depth, so dams are thicker at the bottom. A model dam in a tray of water shows that a trapezoid profile resists the push of water better than a thin wall. - [Two-lens refracting telescope from a pair of magnifying glasses](https://engineergurukul.com/resources/project-ideas/two-lens-refracting-telescope/): A long-focus lens gathers light from a distant object and forms a small image. A second short-focus lens acts as a magnifier for that image, so far-away objects look larger and nearer. - [Whirling ball orbit: how speed changes with string length](https://engineergurukul.com/resources/project-ideas/whirling-ball-orbit-speed-radius/): A ball on a string moving in a circle needs a steady inward pull. This pull mimics gravity for a satellite. For the same pull, a longer string needs a faster ball, while real planets nearer the Sun move faster because gr - [Doppler shift of a whirling buzzer, the idea behind galaxy redshift](https://engineergurukul.com/resources/project-ideas/doppler-whirling-buzzer-redshift/): A sound source moving towards you sounds higher in pitch, and one moving away sounds lower. Astronomers use the same idea with light to find that distant galaxies are moving away from us. - [CD spectroscope that splits daylight, bulb and tube light](https://engineergurukul.com/resources/project-ideas/cd-spectroscope-sun-lamp-spectra/): A CD acts as a diffraction grating, splitting light into colours. Different sources give different patterns of colour, and astronomers use the same idea to find what stars are made of. - [Launch angle and range with a spring catapult: is 45 degrees best?](https://engineergurukul.com/resources/project-ideas/launch-angle-range-spring-catapult/): The range of a projectile depends on the launch angle. On level ground and with little air drag, the greatest range occurs at 45 degrees, and complementary angles such as 30 and 60 degrees give the same range. - [Spinning paper-cup curve: the Magnus effect in spin bowling](https://engineergurukul.com/resources/project-ideas/spinning-cup-magnus-curve-ball/): A spinning object moving through the air curves sideways. A spinning paper-cup spool launched by unwinding a rubber band or thread shows a curved flight, as a spinning cricket ball or football does. - [Playground swing as a pendulum: does the rider’s weight change the time?](https://engineergurukul.com/resources/project-ideas/playground-swing-pendulum-timing/): The time of a swing depends on its length and not on how heavy the rider is. A small model pendulum and a real swing both give a period close to 2 times pi times the square root of length over g. - [Football air pressure and bounce height with a hand pump](https://engineergurukul.com/resources/project-ideas/football-air-pressure-and-bounce-height/): The more air pressure inside a ball, the harder it is and the higher it bounces. A ball that is too soft loses a lot of energy because it squashes more on impact. ### Chemistry, Class 11 and 12 - [Electrolysis of water](https://engineergurukul.com/resources/project-ideas/electrolysis-of-water/): An electric current splits water into hydrogen at the negative electrode and oxygen at the positive one. About twice as much hydrogen as oxygen collects, which matches the formula H₂O. - [Vitamin C in fruit juices](https://engineergurukul.com/resources/project-ideas/vitamin-c-in-juices/): Vitamin C reacts with iodine. When iodine solution is added drop by drop to a juice containing starch, the blue-black colour appears only after all the vitamin C is used up, so more drops mean more vitamin C. - [Foaming capacity of soaps](https://engineergurukul.com/resources/project-ideas/foaming-capacity-of-soaps/): Soaps differ in how much lather they make. In hard water, calcium and magnesium salts react with soap to form scum, so less foam forms. - [Temperature and the rate of a reaction](https://engineergurukul.com/resources/project-ideas/reaction-rate-temperature/): An effervescent tablet dissolves faster in warm water, because the particles move faster and collide more often and with more energy. Crushing the tablet speeds it up too, by giving it more surface area. - [Oxalate in guava as it ripens](https://engineergurukul.com/resources/project-ideas/oxalate-in-guava/): Guava contains oxalate ions. Titrating extracts of raw, half-ripe and ripe guava with potassium permanganate shows how the amount of oxalate changes as the fruit ripens. - [Simple food adulteration tests](https://engineergurukul.com/resources/project-ideas/food-adulteration-tests/): Some adulterants show up with simple tests: starch in milk, paneer or khoa turns blue-black when iodine is added to the boiled and cooled sample, and sawdust or brick powder in spices floats or settles when the powder is - [Comparing water hardness of local samples by soap drop count](https://engineergurukul.com/resources/project-ideas/water-hardness-soap-drop-count-of-local-samples/): Hard water contains dissolved calcium and magnesium salts that react with soap to form scum before any lather can form. Counting the drops of a standard soap solution needed to get a lasting lather ranks tap, borewell, R - [Does boiling soften water? Temporary against permanent hardness](https://engineergurukul.com/resources/project-ideas/temporary-hardness-removed-by-boiling-lather-test/): Temporary hardness, caused by calcium and magnesium bicarbonates, is removed by boiling, which deposits them as carbonate scale. Permanent hardness from sulphates and chlorides is not. Testing a sample before and after b - [Rate of reaction and concentration: vinegar strength by mass loss](https://engineergurukul.com/resources/project-ideas/reaction-rate-vinegar-concentration-mass-loss/): When baking soda reacts with vinegar, the carbon dioxide escapes and the flask gets lighter. Following the mass on a balance every 15 to 30 seconds gives a rate curve, and repeating with diluted vinegar shows that the ra - [Electroplating a steel key with copper from copper sulphate](https://engineergurukul.com/resources/project-ideas/copper-electroplating-a-key-with-copper-sulphate/): Passing a small current through copper sulphate solution deposits a layer of copper on the object connected to the negative terminal, while the copper anode slowly dissolves to replace the copper ions. A clean steel key - [Mass of copper deposited against time: testing Faraday’s law](https://engineergurukul.com/resources/project-ideas/electroplating-mass-deposited-vs-time-faraday/): The mass of copper deposited in electrolysis is proportional to the charge passed, that is current multiplied by time. Weighing the cathode after fixed intervals at a steady current gives a straight line, and the slope l - [Soap against detergent: lather height in hard and soft water](https://engineergurukul.com/resources/project-ideas/soap-vs-detergent-lather-in-hard-water/): Soap forms insoluble scum with the calcium and magnesium in hard water and lathers poorly, while a synthetic detergent forms soluble calcium salts and lathers almost as well in hard water as in soft. Measuring foam heigh - [pH of tea and coffee against brewing time and added milk](https://engineergurukul.com/resources/project-ideas/ph-of-tea-and-coffee-against-brewing-time/): Tea and coffee are mildly acidic, and the acidity depends on how long they brew and whether milk is added. Measuring pH with indicator paper for black tea, green tea and coffee brewed for different times shows how extrac - [Corrosion rate of iron nails against salt concentration](https://engineergurukul.com/resources/project-ideas/corrosion-rate-of-iron-nails-vs-salt-concentration/): Rusting is an electrochemical process that speeds up when the water conducts better. Nails kept in water with 0, 1, 3.5 and 10 percent salt for two weeks, then cleaned and weighed, show that salt accelerates corrosion, w - [Sacrificial protection: zinc-wrapped against copper-wrapped nails](https://engineergurukul.com/resources/project-ideas/sacrificial-protection-zinc-vs-copper-wrapped-nails/): An iron nail wrapped with zinc stays bright in salt water because the more reactive zinc corrodes instead, while a nail wrapped with copper rusts faster than a bare nail because copper makes the iron the more reactive pa - [Comparing vinegar brands by drop titration with washing soda](https://engineergurukul.com/resources/project-ideas/vinegar-brand-strength-by-washing-soda-drop-titration/): The acetic acid content of vinegar can be compared by titrating a measured volume with a standard washing soda solution until an indicator changes colour. Running three brands and a home-made dilution ranks them by stren - [Which antacid neutralises the most acid? A vinegar drop count](https://engineergurukul.com/resources/project-ideas/antacid-tablets-neutralising-power-comparison/): Antacids are bases or salts of weak acids that react with acid and neutralise it. Counting how many drops of vinegar one tablet can neutralise lets you compare brands fairly, per tablet and per gram. - [How much calcium carbonate is in an eggshell? Mass loss in vinegar](https://engineergurukul.com/resources/project-ideas/calcium-carbonate-percentage-in-eggshell/): Eggshell is mostly calcium carbonate. When it reacts with vinegar it gives off carbon dioxide, so the loss in mass of the flask tells you how much calcium carbonate was present. - [Hot or cold? Temperature change when different solids dissolve](https://engineergurukul.com/resources/project-ideas/heat-change-when-solids-dissolve/): Dissolving some solids makes the water colder (endothermic) and dissolving others makes it warmer (exothermic). The reason is the balance between the energy needed to break the solid apart and the energy released as wate - [Iron nail in copper sulphate: weighing the copper that appears](https://engineergurukul.com/resources/project-ideas/iron-nail-copper-sulphate-displacement-mass/): A more reactive metal pushes a less reactive metal out of its salt solution. Iron displaces copper from copper sulphate, and the mass of copper formed can be compared with the mass of iron used. - [Cooling curve of candle wax: where the temperature stops falling](https://engineergurukul.com/resources/project-ideas/candle-wax-cooling-curve-plateau/): When liquid wax freezes it gives out latent heat, so the temperature stays nearly steady while it solidifies. The flat part of the cooling curve marks the freezing point. - [Does salt raise the boiling point of water? A measured test](https://engineergurukul.com/resources/project-ideas/boiling-point-rise-with-salt/): A dissolved solid raises the boiling point of water, and the rise grows with the amount of solute. This is called boiling point elevation and is a colligative property. - [Phitkari loses nearly half its mass: water of crystallisation](https://engineergurukul.com/resources/project-ideas/alum-water-of-crystallisation-heating/): Crystals of potash alum contain water locked in their structure. On heating the water is driven off as steam and the crystal puffs up into a white powder that weighs much less than before. - [Solubility curves: alum rises steeply with heat, salt hardly moves](https://engineergurukul.com/resources/project-ideas/solubility-curve-alum-and-salt/): Solubility is the mass of solute that dissolves in a fixed amount of water at a given temperature. A plotted curve shows that for alum it rises sharply with temperature, and for common salt it hardly changes. - [Charles’s law with a sealed syringe in cold and hot water baths](https://engineergurukul.com/resources/project-ideas/charles-law-syringe-water-baths/): A fixed amount of gas at constant pressure expands steadily as its temperature rises. A graph of volume against temperature is a straight line that points to about minus 273 degrees C. - [Vitamin C clock: a colourless mix that turns blue on time](https://engineergurukul.com/resources/project-ideas/vitamin-c-iodine-clock-reaction/): In a clock reaction nothing seems to happen for a measured time and then the colour changes suddenly. The delay depends on how much vitamin C is present, so the time can be used to measure concentration. - [Catalyst race: which kitchen catalyst breaks down hydrogen peroxide fastest?](https://engineergurukul.com/resources/project-ideas/hydrogen-peroxide-catalyst-race-yeast-potato/): Catalysts speed up a reaction without being used up. Yeast and raw potato contain catalase, an enzyme that breaks hydrogen peroxide into water and oxygen, and the volume of oxygen collected measures how fast it works. - [Daniell cell with a paper salt bridge: measuring 1 volt from two metals](https://engineergurukul.com/resources/project-ideas/daniell-cell-zinc-copper-salt-bridge/): A chemical cell turns the energy of a redox reaction into electricity. Zinc and copper in their salt solutions, joined by a salt bridge, give a voltage of about 1 volt that falls as the reaction proceeds. - [Dyeing cotton with turmeric and onion skin: does a mordant help?](https://engineergurukul.com/resources/project-ideas/natural-dye-mordant-cotton-colourfastness/): Many natural dyes wash out of cotton unless a mordant is used. A mordant such as alum forms a link between the dye and the fibre, making the colour stronger and more lasting. - [Spinach leaf pigments separated by paper chromatography with Rf values](https://engineergurukul.com/resources/project-ideas/leaf-pigments-paper-chromatography-rubbing-alcohol/): A green leaf contains several pigments. Paper chromatography separates them because they travel up the paper at different speeds, and the ratio of distances, the Rf value, identifies each one. - [Hot ice: making sodium acetate that freezes warm from baking soda](https://engineergurukul.com/resources/project-ideas/hot-ice-sodium-acetate-from-baking-soda/): A supersaturated solution holds more solute than it normally should. Touching it with one seed crystal sets off fast crystallisation that gives out heat, so the liquid turns into a warm solid. - [Alum against moringa seed powder: which clears muddy water faster?](https://engineergurukul.com/resources/project-ideas/alum-against-moringa-seed-powder-clears-muddy-water/): Coagulants make tiny suspended particles clump together and sink. Comparing alum (phitkari) with crushed moringa seed shows two ways to clear turbid water before filtering. - [Vitamin C in raw and boiled vegetables with iodine and starch](https://engineergurukul.com/resources/project-ideas/vitamin-c-raw-versus-boiled-vegetables/): Vitamin C is destroyed by heat and dissolves in cooking water. A starch and iodine indicator that loses its blue colour when vitamin C is present lets you compare how much each sample contains. ### Biology, Class 11 and 12 - [Human heart model with double circulation](https://engineergurukul.com/resources/project-ideas/human-heart-model/): The heart has four chambers. The right side pumps blood to the lungs to pick up oxygen, and the left side pumps it to the rest of the body. Valves stop the blood flowing backwards. - [DNA double helix model](https://engineergurukul.com/resources/project-ideas/dna-double-helix/): DNA is two strands twisted into a double helix. The sides are sugar and phosphate; the rungs are pairs of bases, with A always joined to T and G to C. - [Does the colour of light affect plant growth?](https://engineergurukul.com/resources/project-ideas/light-colour-and-plant-growth/): Chlorophyll absorbs red and blue light strongly and reflects most green light, so seedlings under green filters usually grow more weakly than those in white light. - [Yeast fermentation and temperature](https://engineergurukul.com/resources/project-ideas/yeast-fermentation/): Yeast feeds on sugar and gives off carbon dioxide gas, which inflates a balloon fastest in warm water. Cold slows the yeast down and very hot water kills it. - [Osmosis in potato strips](https://engineergurukul.com/resources/project-ideas/osmosis-in-potato/): Water moves through cell membranes from a weaker solution to a stronger one (osmosis). Potato strips in strong salt or sugar water lose water and shrink; strips in plain water take in water and firm up. - [Salivary amylase and temperature](https://engineergurukul.com/resources/project-ideas/salivary-amylase/): The enzyme amylase in saliva breaks starch down into sugar. Iodine stops turning blue-black once the starch is gone, which happens fastest near body temperature; boiling destroys the enzyme. - [Extract DNA from a banana](https://engineergurukul.com/resources/project-ideas/dna-from-a-banana/): Washing-up liquid breaks open the cell membranes, salt helps the DNA clump together, and ice-cold alcohol makes the DNA come out of solution as white strands you can see. - [Stages of mitosis in onion root tips](https://engineergurukul.com/resources/project-ideas/mitosis-in-onion-root/): Root tips grow by cell division. A stained squash of an onion root tip under a microscope shows cells in prophase, metaphase, anaphase and telophase. - [Counting oxygen bubbles from Hydrilla at different light distances](https://engineergurukul.com/resources/project-ideas/hydrilla-oxygen-bubbles-light-distance/): A water plant in bright light gives off bubbles of oxygen, because it is making food by photosynthesis. The closer the lamp, the faster the bubbles stream, until another factor limits the rate. - [Spinach leaf pigments separated on filter paper](https://engineergurukul.com/resources/project-ideas/spinach-leaf-pigments-paper-chromatography/): The green colour of a leaf is a mixture of several pigments. When the extract climbs a strip of paper, the pigments travel different distances and show as bands of green, yellow and orange. - [Detached leaves left on a tray: which type loses weight fastest?](https://engineergurukul.com/resources/project-ideas/detached-leaves-weight-loss-by-leaf-type/): Leaves lose water to the air, mostly through their stomata. Weighing different leaf types over two days shows how leaf structure affects water loss. - [Potometer from a straw and a syringe: still air, fan or shade](https://engineergurukul.com/resources/project-ideas/straw-potometer-still-air-fan-shade/): A potometer measures how fast a cut shoot takes up water, which is close to how fast it transpires. Changing wind or light shows which factors speed water loss from leaves. - [Rhoeo leaf peel: counting stomata and guard cells](https://engineergurukul.com/resources/project-ideas/rhoeo-leaf-peel-stomata-count/): The lower surface of many leaves is dotted with tiny pores called stomata, each between two bean-shaped guard cells. Counting them under a microscope shows where a leaf exchanges gases and water vapour. - [Lung volumes measured by water displacement in a bottle](https://engineergurukul.com/resources/project-ideas/lung-capacity-bottle-displacement-breath-volumes/): The air you breathe out can be measured by the water it pushes out of an upturned bottle. It gives your tidal volume and your vital capacity, and shows how they compare between people. - [Villi and surface area: flat cloth against a looped towel](https://engineergurukul.com/resources/project-ideas/villi-towel-surface-area-absorption-test/): The inside of the small intestine is covered with finger-like villi that give it a very large surface area for absorbing food. A looped towel soaks up much more water than a flat cloth of the same size, just as a villus- - [Salt and yeast: how much does salt slow a rising dough?](https://engineergurukul.com/resources/project-ideas/salt-and-yeast-dough-rise-in-a-glass/): Yeast makes dough rise by fermenting sugar and giving off carbon dioxide. Adding more salt to the dough slows the yeast, so the dough rises less. - [Compost bucket temperature log: green waste against a green and brown mix](https://engineergurukul.com/resources/project-ideas/compost-bucket-temperature-log-green-and-brown-mix/): Microbes in a compost heap give off heat as they break down waste. A balanced mix of green and brown material, kept moist and aerated, warms up more than green waste alone. - [Leaf litter in mesh bags: which leaves rot fastest in soil?](https://engineergurukul.com/resources/project-ideas/leaf-litter-mesh-bags-which-leaves-rot-fastest/): Fallen leaves are broken down by fungi, bacteria and soil animals. Burying equal weights of different leaves in mesh bags and weighing them later shows which kinds decompose faster. - [Catalase in potato: raw, boiled and crushed pieces make different foam](https://engineergurukul.com/resources/project-ideas/catalase-in-potato-raw-boiled-and-crushed-foam-height/): Living cells make an enzyme, catalase, that breaks hydrogen peroxide into water and oxygen. Raw potato foams strongly when added to dilute peroxide, boiled potato hardly foams, and crushed potato foams fastest. - [Fresh and tinned pineapple in jelly: an enzyme that eats protein](https://engineergurukul.com/resources/project-ideas/fresh-and-tinned-pineapple-in-jelly-protein-enzyme-test/): Fresh pineapple contains bromelain, an enzyme that breaks down proteins, so it stops gelatin jelly from setting. Tinned or boiled pineapple, whose enzyme has been destroyed by heat, lets the jelly set normally. - [Mendel with coins: tossing a pea cross to find the 3 to 1 ratio](https://engineergurukul.com/resources/project-ideas/mendel-coin-toss-pea-cross-3-to-1-ratio/): When two hybrid tall pea plants are crossed, each offspring gets one gene copy from each parent at random. Tossing two coins 100 times copies this and shows the 1 to 2 to 1 genotype and 3 to 1 appearance ratios. - [Coloured bead necklace from DNA to mRNA to a short protein](https://engineergurukul.com/resources/project-ideas/coloured-bead-dna-to-protein-codon-necklace/): The order of bases in a gene is copied into a messenger strand, and every three bases of that strand name one amino acid. Four colours of beads show the copying and reading step by step. - [Balloon biogas digesters: kitchen waste against cow dung slurry](https://engineergurukul.com/resources/project-ideas/balloon-biogas-digesters-kitchen-waste-against-dung/): Microbes break down organic waste without air and release biogas, mostly methane and carbon dioxide. Measuring balloon size over days compares how much gas different feedstocks give. - [Compost heap temperature log: heat from living microbes](https://engineergurukul.com/resources/project-ideas/compost-heap-temperature-log-in-a-bin/): Microbes breaking down garden waste release heat, so a compost heap warms up. A daily log of temperature shows the stages of composting and the effect of turning and moisture. - [Fenugreek in nutrient water against garden soil: a growth race](https://engineergurukul.com/resources/project-ideas/fenugreek-in-water-against-soil-growth-race/): Comparing hydroponic and soil growth under the same light shows what soil adds and what plants really need. Measuring height, root length and mass gives data to judge each method. - [Salty irrigation water: how much salt can seeds tolerate?](https://engineergurukul.com/resources/project-ideas/salty-irrigation-water-and-seed-germination/): Salt in irrigation water stops seeds from taking up water. Germination counts across different salt strengths show why saline groundwater harms crops. - [Neem, garlic and soap sprays compared on leaf-eating damage](https://engineergurukul.com/resources/project-ideas/neem-garlic-and-soap-sprays-on-leaf-damage/): Natural sprays can reduce insect damage on crops without strong pesticides. Counting damaged leaves on sprayed and unsprayed plants gives data on which home-made spray works best. - [Seed age and storage method: how germination falls with time](https://engineergurukul.com/resources/project-ideas/seed-age-and-storage-method-germination-test/): Seeds lose the ability to sprout over time, and storage conditions change how fast. Testing old and new seeds kept in different ways shows how to store seed for the next season. - [Protecting stored pulses from weevils with neem, ash and turmeric](https://engineergurukul.com/resources/project-ideas/protecting-stored-pulses-from-weevils-neem-ash-turmeric/): Grain stores lose food to weevils and beetles. Comparing traditional protectants in sealed jars shows how farmers can protect stored pulses without chemical sprays. - [Earthworm food choice chamber: what do vermicompost worms prefer?](https://engineergurukul.com/resources/project-ideas/earthworm-food-choice-chamber-for-vermicompost/): A choice chamber lets worms pick between foods. The amount eaten of each food shows what to feed a vermicompost bin and what to avoid. - [Root nodule survey: pulse plants against cereals in a field](https://engineergurukul.com/resources/project-ideas/root-nodule-survey-of-pulse-plants-and-cereal-roots/): Legume roots carry nodules full of nitrogen-fixing bacteria, which enrich the soil. Comparing roots of pulses and cereals shows why farmers rotate crops with beans, gram or groundnut. - [Potometer water uptake of a leafy shoot in still air, wind, shade and sun](https://engineergurukul.com/resources/project-ideas/potometer-water-uptake-in-still-air-wind-and-shade/): Plants lose water through their leaves, and conditions change how fast. A potometer measures water uptake, and results show how much water crops need on hot or windy days. - [Sleep diary and morning reaction time across a school week](https://engineergurukul.com/resources/project-ideas/sleep-diary-and-ruler-reaction-week/): Reaction time is how quickly we respond to a signal. Comparing the hours slept with the ruler-drop reaction distance each morning tests a common belief about sleep and alertness with your own data. - [Salt in snack packets: a bar chart from sodium on the labels](https://engineergurukul.com/resources/project-ideas/salt-in-snack-packets-bar-chart/): Labels list sodium, not salt. Converting sodium in milligrams to salt in grams shows how quickly everyday snacks add up. This helps students read the label as a piece of data. ### Maths, Class 11 and 12 - [Fibonacci numbers in nature](https://engineergurukul.com/resources/project-ideas/fibonacci-in-nature/): In the sequence 1, 1, 2, 3, 5, 8, 13 and so on, each number is the sum of the two before it, and the ratio of neighbours gets closer to about 1.618, the golden ratio. The spirals on sunflower heads and pine cones often c - [Estimate pi by dropping needles (Buffon’s needle)](https://engineergurukul.com/resources/project-ideas/buffons-needle-pi/): Drop a needle of length L onto lines spaced d apart, with L no longer than d. The chance that it crosses a line is 2L ÷ (πd), so counting crossings over many drops gives an estimate of π. - [Unit circle trigonometry board with a swinging radius arm](https://engineergurukul.com/resources/project-ideas/unit-circle-trig-board-swinging-arm/): A 10 cm arm pivots at the centre of a circle on a grid. At any angle, the height of its tip above the horizontal is 10 times the sine and the distance along the horizontal is 10 times the cosine, so at 30 degrees the tip - [Nail-board Galton machine that drops beads into a bell curve](https://engineergurukul.com/resources/project-ideas/nail-board-galton-bell-curve/): Beads falling through seven rows of nails bounce left or right at random at each nail. With eight collecting slots at the bottom, the expected share of beads in each slot follows Pascal's triangle, 1, 7, 21, 35, 35, 21, - [Birthday paradox survey across the sections of a school](https://engineergurukul.com/resources/project-ideas/birthday-paradox-school-survey/): In a group of just 23 people there is a better than even chance (about 50.7 percent) that two share a birthday, and with 30 people the chance is about 70.6 percent. Collecting birthdays from many class sections shows how - [Estimate pi by scattering rice over a square and its circle](https://engineergurukul.com/resources/project-ideas/monte-carlo-pi-with-rice-grains/): Rice grains scattered evenly over a square land inside the circle drawn within it with probability equal to the circle's share of the area, which is pi divided by 4. Counting grains inside and outside and multiplying the - [Clay double cone cut to reveal all four conic sections](https://engineergurukul.com/resources/project-ideas/clay-cone-conic-sections-cut/): Slicing a cone with a flat cut gives a circle when the cut is parallel to the base, an ellipse when tilted, a parabola when parallel to the slanting side, and a hyperbola when steeper than the slanting side. Clay cones, - [String art parabola made from straight lines only](https://engineergurukul.com/resources/project-ideas/string-art-parabola-envelope/): Threads joined between two scales at right angles, the first point on one to the last on the other and so on, form no curve themselves, yet their edges outline a smooth parabola. The curve is the envelope of the lines, t - [Pin and string ellipse drawer with measured focus distances](https://engineergurukul.com/resources/project-ideas/pin-and-string-ellipse-drawer/): A loop of string round two pins and a pencil draws an ellipse, because the pencil keeps the sum of its distances to the two pins constant. With pins 6 cm apart and a loop giving a major axis of 10 cm, the minor axis come - [Seven bridges of Konigsberg board with removable bridges](https://engineergurukul.com/resources/project-ideas/konigsberg-bridges-removable-board/): Four land areas joined by seven bridges cannot be walked in one trip crossing every bridge once, because every land area has an odd number of bridges. Lifting any one bridge off the board leaves only two odd areas and th - [Width of a pond or river from a baseline and the sine rule](https://engineergurukul.com/resources/project-ideas/pond-width-sine-rule-baseline/): You can find a distance you cannot measure directly by measuring a baseline and two angles. The sine rule in the triangle then gives the width. - [Sine wave drawn by a turning wheel and a moving roll of paper](https://engineergurukul.com/resources/project-ideas/sine-curve-from-rotating-wheel-roll-of-paper/): The height of a point on a turning wheel, measured above the centre, follows a sine curve in time. Tracing it on moving paper gives amplitude, period and a smooth wave. - [Arm span against height: scatter plot, mean, spread and best-fit line](https://engineergurukul.com/resources/project-ideas/arm-span-height-scatter-and-line-of-best-fit/): Two measurements on the same person can be linked. Collecting data for a class and drawing a scatter plot, a line of best fit and a correlation shows how statistics finds a pattern in data. - [Area of a leaf by random dots: a Monte Carlo estimate with a check](https://engineergurukul.com/resources/project-ideas/leaf-area-by-random-dots-monte-carlo/): The area of an odd shape can be estimated by throwing random points on a square that contains it. The share of points that land inside the shape estimates the share of the square it covers. - [Monty Hall with three cups: should you switch? 100 trials and the proof](https://engineergurukul.com/resources/project-ideas/monty-hall-three-cups-game-experiment/): In the three-door puzzle, switching wins two times out of three, though many people feel that it is a fifty-fifty choice. Playing it many times and listing all the outcomes shows why. - [How long is a game of snakes and ladders? 100 simulated games](https://engineergurukul.com/resources/project-ideas/snakes-and-ladders-average-game-length/): The number of turns to finish a game is random but has a stable average. Playing or simulating many solo games gives the mean game length and shows how the snakes and ladders change it. - [Balancing a cardboard triangle at its centroid, checked by coordinates](https://engineergurukul.com/resources/project-ideas/centroid-of-triangle-balancing-coordinates/): The point where the three medians of a triangle meet is its centroid, and a flat triangle balances there. Its coordinates are the average of the three vertex coordinates. - [Taxicab geometry on a city grid: distances, midpoints and square circles](https://engineergurukul.com/resources/project-ideas/taxicab-geometry-city-grid-circles/): On a street grid you cannot travel diagonally, so the distance is the sum of the horizontal and vertical steps. With this rule a circle looks like a diamond, which shows that geometry depends on how distance is defined. - [Bouncing ball: a geometric sequence of heights and its infinite sum](https://engineergurukul.com/resources/project-ideas/bouncing-ball-geometric-sequence-sum-to-infinity/): A ball that bounces back to a fixed fraction of its previous height gives a geometric sequence of heights. The total distance travelled until it stops is the sum of a geometric series. - [Biggest open box from a square sheet: calculus against trial boxes](https://engineergurukul.com/resources/project-ideas/open-box-maximum-volume-calculus-check/): Cutting equal squares from the corners of a sheet and folding it gives a box. The volume rises and then falls as the cut grows, and calculus predicts exactly where it is greatest. - [Area under a curve by rectangles and trapeziums before the integral](https://engineergurukul.com/resources/project-ideas/area-under-a-curve-rectangles-trapeziums-graph-paper/): The area under a curve can be approximated by many thin strips. The more strips used, the closer the sum is to the definite integral. - [Speed of a toy car from tangents to its distance-time graph](https://engineergurukul.com/resources/project-ideas/toy-car-speed-from-tangents-on-distance-time-graph/): The slope of a distance-time graph at a point is the instantaneous speed, which is the derivative of distance with respect to time. A car on a ramp that speeds up gives a curve whose tangents get steeper. - [Hanging chain or hanging bridge? Catenary and parabola compared](https://engineergurukul.com/resources/project-ideas/chain-catenary-versus-loaded-string-parabola/): A chain hanging under its own weight forms a catenary, while a cable carrying a load spread evenly along the horizontal, as in a suspension bridge, forms a parabola. The two curves look alike but have different equations - [Two bags of beads: conditional probability and Bayes by experiment](https://engineergurukul.com/resources/project-ideas/two-bags-of-beads-conditional-probability-bayes/): When you know which colour was drawn, you can work backwards to the chance of which bag it came from. The experiment shows how new information updates a probability. - [Range against launch angle: does 45 degrees really go farthest?](https://engineergurukul.com/resources/project-ideas/projectile-range-against-launch-angle-sin-2-theta/): For a projectile launched at the same speed from ground level, the range is proportional to sin 2 theta, which is greatest at 45 degrees. Equal ranges occur for angles that add up to 90 degrees. ### Earth and space, Class 11 and 12 - [IoT weather station](https://engineergurukul.com/resources/project-ideas/iot-weather-station/): Temperature, humidity and pressure sensors take readings every few minutes, and a Wi-Fi board sends them to a web dashboard, building up a record of the local weather. - [Measuring the dew point with a shiny can and ice](https://engineergurukul.com/resources/project-ideas/dew-point-with-an-ice-can/): The dew point is the temperature at which air becomes saturated and water starts to condense. Cooling a shiny can slowly until it mists over gives the dew point, and from dew point and air temperature the relative humidi - [Rotating planisphere star finder for your latitude](https://engineergurukul.com/resources/project-ideas/planisphere-star-finder-dial/): A planisphere is a star map on a dial with a window shaped for one latitude. Turning the dial to the date and time shows exactly which stars are above the horizon, which demonstrates how the sky shifts through the night - [Why the monsoon blows: sand versus water heating and cooling test](https://engineergurukul.com/resources/project-ideas/monsoon-land-and-sea-heating-test/): Land heats and cools much faster than water. In summer the hot Indian land has low pressure and air flows in from the cooler sea, carrying moisture; in winter the land is colder and the flow reverses. Measuring sand and - [Measuring the Earth’s circumference from shadows in two cities](https://engineergurukul.com/resources/project-ideas/earth-circumference-two-shadows-eratosthenes/): Eratosthenes found the size of the Earth by comparing noon shadows at two places a known distance apart. You can repeat it with a friendly school in another city to find the Earth’s circumference. - [Find your latitude with a straw, a protractor and the Pole Star](https://engineergurukul.com/resources/project-ideas/find-your-latitude-pole-star-straw-protractor/): The height of the Pole Star above the horizon is nearly equal to your latitude in the northern hemisphere. A homemade angle measurer can show your place on Earth. - [Noon shadow tip marked every week: the analemma figure-eight](https://engineergurukul.com/resources/project-ideas/analemma-noon-shadow-tip-weekly-marks/): If you mark the tip of a stick’s shadow at the same clock time each week, the marks form a long thin figure-eight called the analemma. It combines the Earth’s tilted axis with its elliptical orbit. - [Diameter of the Sun from a pinhole image on a card](https://engineergurukul.com/resources/project-ideas/diameter-of-the-sun-from-a-pinhole-image/): The Sun’s image through a small hole is a circle whose size depends on the distance to the screen. Using similar triangles with the Sun’s distance gives its real diameter, about 1.4 million km. - [Kepler’s third law: plotting T squared against a cubed for the planets](https://engineergurukul.com/resources/project-ideas/keplers-third-law-planet-data-t-squared-a-cubed/): The square of a planet’s orbital period is proportional to the cube of its average distance from the Sun. Plotting real data for the six planets known to Kepler, Earth included, gives a straight line of slope 1 when the - [Parallax: measuring distance to a tree with a thumb and your eyes](https://engineergurukul.com/resources/project-ideas/parallax-distance-thumb-method-and-baseline/): A nearby object appears to shift against a far background when you view it from two places. Measuring the shift and the baseline gives its distance, the same method astronomers use for nearby stars. - [Counting stars in a tube: a light pollution survey of your town](https://engineergurukul.com/resources/project-ideas/star-count-in-a-tube-light-pollution-survey/): The number of stars you can see falls when street lights and glare brighten the sky. Counting stars in a fixed patch of sky at different places gives a simple measure of light pollution. - [Capillary rise of water in sand, silt and clay columns](https://engineergurukul.com/resources/project-ideas/capillary-rise-in-sand-silt-and-clay-columns/): Water climbs up through the tiny gaps between soil grains. Fine soils such as clay can lift water higher but slowly, and coarse sand lifts it only a little but fast, which matters for how crops reach water. - [Sand tank with two wells: drawdown and well interference](https://engineergurukul.com/resources/project-ideas/sand-tank-two-wells-drawdown-and-interference/): Pumping water from a well lowers the water table around it in a cone shape. Two close wells lower each other’s water, which is why borewells too near each other fail in summer. - [Equinox noon shadow: finding your latitude with a vertical stick](https://engineergurukul.com/resources/project-ideas/equinox-noon-shadow-latitude/): On an equinox the Sun is directly over the equator at noon. The angle of the Sun above the horizon at your place is then 90 degrees minus your latitude, so a shadow measurement gives your latitude within a degree or two. - [Night-sky clock that tells time from the Saptarishi stars](https://engineergurukul.com/resources/project-ideas/star-clock-nocturnal-saptarishi/): The Saptarishi (Great Bear) pattern turns around the Pole Star once in about 24 hours, like a giant clock hand. A simple two-disc instrument called a nocturnal can use it to tell the time at night. - [Measuring the Moon’s angular size with a coin and a metre ruler](https://engineergurukul.com/resources/project-ideas/moon-angular-size-coin-ruler/): An object’s apparent size depends on its distance. A coin held at a measured distance from your eye (a few metres for an ordinary coin) that just covers the Moon gives the Moon’s angular size, about half a degree, and th - [Eratosthenes’ method: estimating Earth’s size from two cities’ shadows](https://engineergurukul.com/resources/project-ideas/eratosthenes-earth-size-two-cities/): Two sticks in two cities, measured at noon on the same day, give different shadow angles. The difference, together with the distance between the cities, gives the circumference of Earth. ### Electronics and robotics, Class 11 and 12 - [Smart dustbin with Arduino](https://engineergurukul.com/resources/project-ideas/smart-dustbin/): An ultrasonic sensor sends out a pulse of sound and times its echo to measure distance. When a hand comes close, the Arduino tells a servo motor to lift the lid. - [Obstacle-avoiding robot](https://engineergurukul.com/resources/project-ideas/obstacle-avoiding-robot/): The robot measures the distance ahead with an ultrasonic sensor. When something is too close, the program stops, turns and looks for a clear path, driving the motors through a motor driver. - [Line follower robot](https://engineergurukul.com/resources/project-ideas/line-follower-robot/): IR sensors shine infrared light at the floor: white reflects it and black absorbs it. The controller reads which sensor sees the line and steers the motors to stay on it. - [Automatic plant watering system](https://engineergurukul.com/resources/project-ideas/automatic-plant-watering/): A soil moisture sensor gives a reading that changes with the water in the soil. When the soil is dry, the Arduino switches on a small pump until it is moist again. - [Solar tracker with LDRs](https://engineergurukul.com/resources/project-ideas/solar-tracker/): Two LDRs compare the light on either side of the panel. The microcontroller turns a servo towards the brighter side, so the panel keeps facing the Sun and collects more energy through the day. - [Automatic railway gate control](https://engineergurukul.com/resources/project-ideas/railway-gate-control/): IR sensors detect the train before and after the crossing. The controller closes the gate with a servo and sounds a buzzer as a train approaches, and opens it again once the train has passed. - [Fire-fighting robot](https://engineergurukul.com/resources/project-ideas/fire-fighting-robot/): Flame sensors detect the infrared light from a flame. The robot steers towards the strongest reading and switches on a small pump to spray water at it. - [Gas leakage detector](https://engineergurukul.com/resources/project-ideas/gas-leakage-detector/): The resistance of an MQ-series gas sensor changes when LPG or smoke is in the air. The controller reads it and sounds a buzzer above a set level. - [Bluetooth-controlled car](https://engineergurukul.com/resources/project-ideas/bluetooth-car/): A phone app sends commands over Bluetooth to an HC-05 module. The Arduino reads them and drives the motors forwards, backwards, left and right through a motor driver. - [Phone web page that switches a 12 V LED strip through an ESP8266 relay](https://engineergurukul.com/resources/project-ideas/esp8266-web-page-switch-for-12v-led-strip/): A NodeMCU (ESP8266) joins the home Wi-Fi, runs a tiny web server and turns a relay on or off when a phone browser taps a button. The relay switches a 12 V LED strip, so the whole thing is a low-voltage copy of a smart sw - [PIR corridor light that stays on for a set time after movement](https://engineergurukul.com/resources/project-ideas/pir-corridor-light-with-hold-timer/): A passive infrared (PIR) sensor detects the heat of a moving person. An Arduino switches a 12 V LED strip on through a relay and keeps it on for a timer period that restarts with every new movement, so the light never cu - [Kitchen gas alarm that starts a 12 V exhaust fan through a relay](https://engineergurukul.com/resources/project-ideas/mq2-kitchen-gas-alarm-with-12v-exhaust-fan/): An MQ-2 gas sensor changes resistance when LPG, butane or smoke touches its heated element. The Arduino compares the reading to a threshold, sounds a buzzer, flashes a red LED and switches a 12 V DC fan through a relay t - [Flame sensor store room alarm with a small sprinkler pump](https://engineergurukul.com/resources/project-ideas/flame-sensor-store-room-alarm-with-sprinkler-pump/): An infrared flame sensor module detects the near-infrared light given out by a flame from up to about half a metre away. The Arduino sounds an alarm and runs a 5 V submersible pump through a relay so a tiny sprinkler spr - [RFID door latch that pulls a 12 V solenoid for tagged cards only](https://engineergurukul.com/resources/project-ideas/rfid-door-latch-with-12v-solenoid/): An RC522 reader reads the unique ID of a 13.56 MHz card or key fob. If the ID is in a list stored in the sketch, the Arduino fires a relay for three seconds that pulls a 12 V solenoid bolt open, and an LCD greets the use - [Voice commands from a phone app switch two 12 V lights over Bluetooth](https://engineergurukul.com/resources/project-ideas/bluetooth-voice-commands-for-12v-room-lights/): A free Android voice app converts speech to text and sends it over Bluetooth to an HC-05 module. The Arduino matches words such as "light on" or "fan off" and drives relays that switch 12 V LED lamps and a 12 V fan. - [Automatic curtain that opens at dawn using an LDR and a DC motor](https://engineergurukul.com/resources/project-ideas/ldr-automatic-curtain-with-l298n-motor/): An LDR measures daylight, the Arduino decides open or closed, and an L298N driver runs a geared DC motor in either direction to pull a string curtain across a model window. Two limit switches stop the motor at each end. - [Overhead tank level on your phone with automatic pump control (ESP8266)](https://engineergurukul.com/resources/project-ideas/esp8266-overhead-tank-level-with-auto-pump/): An ultrasonic sensor on the tank lid measures the distance to the water surface. The ESP8266 converts that to a percentage, shows it on a phone page, and switches a 5 V pump through a relay to refill when the level is lo - [Gas leak detector that turns a model cylinder valve shut with a servo](https://engineergurukul.com/resources/project-ideas/gas-leak-servo-valve-shutoff-model/): An MQ-6 LPG sensor senses a leak and an Arduino rotates a high-torque servo fitted to a model regulator knob to the closed position, sounds a buzzer, and shows the gas level on an LCD. It demonstrates automatic shut-off, - [PIR intruder alarm that sends a phone message through an ESP8266](https://engineergurukul.com/resources/project-ideas/esp8266-pir-intruder-alert-to-phone-message/): A PIR sensor watches a room; when it triggers while the system is armed, a NodeMCU sends a message to the owner through a free bot on a messaging app and sounds a local buzzer. The system is armed and disarmed by a messa - [Earthquake alarm with an MPU6050 that cuts a 12 V supply through a relay](https://engineergurukul.com/resources/project-ideas/mpu6050-earthquake-alarm-with-cutoff-relay/): An MPU6050 accelerometer measures shaking on three axes. When the vibration stays above a level for a short time, the Arduino sounds a siren, flashes a light and opens a relay that cuts a 12 V model lighting circuit, as - [Two-zone drip irrigation with soil probes and a phone dashboard (ESP8266)](https://engineergurukul.com/resources/project-ideas/two-zone-drip-irrigation-esp8266-dashboard/): Two soil moisture probes in two pots each control their own 5 V pump through a relay, and a NodeMCU shows both moisture levels and pump states on a phone page. It demonstrates zone-wise watering, the way a farm drip syst - [Model greenhouse that runs a fan and a mist pump from DHT11 readings](https://engineergurukul.com/resources/project-ideas/greenhouse-fan-and-mist-controller-dht11/): A DHT11 inside a clear box greenhouse reads temperature and humidity. The Arduino switches a 12 V fan when it gets too hot and a 5 V mist pump when it gets too dry, keeping the plants in a chosen band and showing the sta - [Water turbidity meter using a laser pointer and an LDR](https://engineergurukul.com/resources/project-ideas/laser-and-ldr-water-turbidity-meter/): A laser beam passes through a sample bottle to an LDR; cloudy water scatters light and the LDR reading falls. The Arduino converts the reading to a clarity scale calibrated with known mixtures and shows it on an LCD, a l - [Tipping bucket rain gauge with a reed switch counted by Arduino](https://engineergurukul.com/resources/project-ideas/tipping-bucket-rain-gauge-reed-switch-counter/): Rain collected by a funnel fills one side of a tiny see-saw bucket; when it tips, a magnet passes a reed switch and the Arduino counts one tip. Knowing the volume per tip and the funnel area gives rainfall in millimetres - [Grain store humidity alarm with an ESP8266 that warns the phone](https://engineergurukul.com/resources/project-ideas/grain-store-humidity-alert-esp8266/): A DHT11 inside a model grain bin watches humidity; stored grain spoils and grows mould when air humidity stays high. The NodeMCU shows the reading on a phone page, sounds a buzzer and sends an alert when humidity stays a - [Indoor air quality logger with MQ-135, an OLED and a phone graph (ESP32)](https://engineergurukul.com/resources/project-ideas/esp32-air-quality-logger-mq135-oled/): An MQ-135 sensor responds to carbon dioxide, ammonia, smoke and other indoor pollutants. An ESP32 shows a rolling value on an OLED, keeps the last hour of readings in memory and draws them as a graph on a phone page, so - [Cup anemometer with a Hall sensor and wind vane on an OLED](https://engineergurukul.com/resources/project-ideas/cup-anemometer-hall-sensor-wind-station/): Three plastic cups on a spindle spin in the wind and a magnet on the spindle passes a Hall sensor once a turn. The Arduino times the pulses to compute wind speed, reads a potentiometer on a wind vane for direction, and s - [Flood early warning post with an ultrasonic level sensor and a three-stage siren](https://engineergurukul.com/resources/project-ideas/ultrasonic-flood-warning-siren-esp8266/): An ultrasonic sensor on a model bridge watches the water level in a model river. As the level rises past three marks the NodeMCU lights green, yellow and red LEDs, sounds a siren at the red mark and shows the level on a - [Dual-axis solar tracker with four LDRs and two servos](https://engineergurukul.com/resources/project-ideas/dual-axis-solar-tracker-four-ldrs-two-servos/): Four LDRs in a cross with small dividing walls sense which side is brighter. Two servos tilt a small solar panel left-right and up-down until all four read the same, so the panel faces the sun. A voltmeter reading from t - [Car parking sensor with an Arduino whose beeps speed up as the wall nears](https://engineergurukul.com/resources/project-ideas/arduino-parking-sensor-beep-rate-ultrasonic/): An ultrasonic sensor measures distance from the time an echo takes to return. The Arduino turns this distance into LED steps and a beeping speed, like the sensor in a car bumper. - [Digital room thermometer with an LM35 and LCD showing the day’s minimum and maximum](https://engineergurukul.com/resources/project-ideas/arduino-lm35-lcd-thermometer-min-max/): The LM35 gives 10 millivolts for every degree Celsius. The Arduino reads this voltage with its analog input, converts it to degrees and shows the present, lowest and highest readings on a screen. - [Sonar radar sweep: a servo-mounted ultrasonic sensor mapping a room on a laptop](https://engineergurukul.com/resources/project-ideas/arduino-servo-sonar-radar-sweep/): Turning an ultrasonic sensor on a servo and sending angle and distance to a laptop builds a polar map of the objects around, like a radar sweep. It combines timing, servo control and serial communication. - [Digital lap stopwatch with an Arduino, three buttons and an LCD](https://engineergurukul.com/resources/project-ideas/arduino-lap-stopwatch-lcd-three-buttons/): The millis() timer counts milliseconds since the board started. Storing the start time and subtracting it from the present value gives elapsed time, which can be shown to a hundredth of a second. - [Reaction time tester with random delay and false start detection (Arduino)](https://engineergurukul.com/resources/project-ideas/arduino-reaction-timer-false-start/): The time between a light and your button press is your reaction time, usually around 0.2 to 0.3 seconds. A microcontroller timer measures it to a thousandth of a second, so you can compare people and conditions. - [Model door lock opened by a 4 digit keypad code and a servo bolt](https://engineergurukul.com/resources/project-ideas/arduino-keypad-code-lock-servo-model/): The Arduino compares the keys typed with a stored code and turns a servo to slide a bolt only when they match. After three wrong tries it locks out for a minute, showing basic access control logic. - [RFID card door opener with an MFRC522 reader that logs who entered](https://engineergurukul.com/resources/project-ideas/arduino-rfid-card-door-opener-mfrc522/): A passive RFID card has no battery: the reader powers it through radio waves and reads its unique ID. The Arduino checks the ID against a list and opens a servo door for known cards only. - [Fingertip pulse sensor showing heartbeats on the Serial Plotter and a beat LED](https://engineergurukul.com/resources/project-ideas/arduino-pulse-sensor-heart-rate-demo/): Each heartbeat changes the amount of blood in the fingertip, and so changes how much light passes through or reflects. A green LED and a light sensor see this tiny change, which the Arduino turns into a beat rate. - [Four-servo robot arm that copies the angles of four knobs](https://engineergurukul.com/resources/project-ideas/arduino-four-servo-robot-arm-potentiometer-control/): Each joint of the arm is a servo whose angle is set by a PWM signal. Reading four potentiometers and mapping each to 0 to 180 degrees lets you pose the arm by hand-turned knobs and pick up light objects. - [Mini sumo robot that finds its opponent and stays inside the white-edged ring](https://engineergurukul.com/resources/project-ideas/arduino-mini-sumo-robot-edge-sensors/): Sumo robots search for an opponent, push it out of a black ring and stop at the white border. This needs edge detection with reflective sensors and distance sensing, with simple decision priority in the code. - [Two-gate speed meter that times a toy car with infrared sensors](https://engineergurukul.com/resources/project-ideas/arduino-two-gate-speed-meter-toy-car/): Speed is distance divided by time. Two infrared beams a known distance apart start and stop a timer as a car passes, so its speed can be found to a good accuracy and compared with a stopwatch. - [Hand-wave theremin: an ultrasonic sensor that plays higher notes as your hand nears](https://engineergurukul.com/resources/project-ideas/arduino-ultrasonic-theremin-hand-music/): The Arduino turns the distance of your hand into the frequency of a tone, so you can play music in the air. It shows how a sensor reading can be mapped to a sound. - [Barometer and altimeter with a BMP280 that detects which floor you are on](https://engineergurukul.com/resources/project-ideas/arduino-bmp280-barometer-floor-altimeter/): Air pressure falls with height, by about 12 pascals for each metre near the ground. A BMP280 sensor can measure this so precisely that it can tell one floor of a building from the next. - [Internet clock showing Indian time on an OLED, set automatically by NTP](https://engineergurukul.com/resources/project-ideas/esp8266-ntp-internet-clock-oled-ist/): Computers set their clocks by asking time servers over the internet using the Network Time Protocol. A NodeMCU can do the same and display accurate Indian Standard Time without a clock chip. - [Stepper motor turntable that turns a product by 10 degrees for 360 degree photos](https://engineergurukul.com/resources/project-ideas/arduino-stepper-photo-turntable-28byj48/): A stepper motor turns in exact small steps instead of spinning freely. The Arduino counts steps to rotate a platform through an exact angle, which is how 3D scanners, printers and camera sliders position things. - [Medicine time reminder box with a DS3231 clock, buzzer and LCD](https://engineergurukul.com/resources/project-ideas/arduino-ds3231-medicine-time-reminder-box/): A real time clock chip keeps time even when the board is off, using a coin cell. The Arduino compares it with set alarm times and sounds a buzzer until a button is pressed. - [Touch-free soap dispenser with an ultrasonic sensor, relay and small pump](https://engineergurukul.com/resources/project-ideas/arduino-touchless-soap-dispenser-pump-relay/): When a hand comes within about 10 cm, the sensor detects it and the Arduino runs a small pump for a fraction of a second. It shows how sensors, relays and timers are combined in a hygiene device. - [Digital kitchen scale built from a load cell, an HX711 amplifier and an Arduino](https://engineergurukul.com/resources/project-ideas/arduino-hx711-kitchen-scale-load-cell/): A load cell is a metal bar whose resistance changes by a tiny amount when it bends under a weight. The HX711 amplifies and digitises this change so the Arduino can show the mass in grams. - [Temperature-controlled 5 V fan with PWM speed steps and a logic-level MOSFET](https://engineergurukul.com/resources/project-ideas/arduino-temperature-stepped-pwm-fan-mosfet/): Pulse width modulation switches a fan on and off thousands of times a second; the fraction of time it is on sets the average power and speed. The Arduino raises the duty cycle as the temperature climbs, as a computer coo - [Cricket scoreboard with MAX7219 LED matrices, scoring buttons and over counter](https://engineergurukul.com/resources/project-ideas/arduino-max7219-cricket-scoreboard-buttons/): A MAX7219 chip drives a whole 8 x 8 LED matrix from three wires. The Arduino keeps the score, wickets and balls in variables and shows them as scrolling or fixed text, like a small scoreboard. - [Old TV remote that switches three LEDs and a servo through an IR receiver](https://engineergurukul.com/resources/project-ideas/arduino-tv-remote-ir-decode-leds-servo/): A remote control flashes an invisible infrared LED in a coded pattern, and a receiver module decodes it into a number. The Arduino can read that number and act on it, so any old remote becomes a controller for your proje - [555 monostable delay timer: calculated against measured pulse width](https://engineergurukul.com/resources/project-ideas/ne555-monostable-delay-timer-rc-calculated-vs-measured/): Staircase and passage lights, bell pushes and sample-and-hold stages all need a pulse of fixed length after a single trigger. A 555 timer in monostable mode gives such a pulse, and its length is set by one resistor and o - [LM317 adjustable 1.25 to 12 V bench supply with a load regulation test](https://engineergurukul.com/resources/project-ideas/lm317-adjustable-bench-supply-with-load-regulation-test/): Every student lab needs a variable DC supply, and shop-bought ones are costly. An LM317 regulator with two resistors gives an adjustable output. The project builds one from a 15 V adapter output and tests how much the ou - [AA cell capacity tester with a constant-current load and Arduino logging](https://engineergurukul.com/resources/project-ideas/aa-cell-capacity-tester-with-arduino-constant-current-load/): Rechargeable and cheap zinc cells carry a printed capacity that is often much higher than the truth. A constant-current load with an Arduino logger finds the real milliamp-hours of a cell by recording voltage until the c - [Joule thief that lights an LED from a nearly flat 1.2 V cell](https://engineergurukul.com/resources/project-ideas/joule-thief-led-lamp-run-from-a-nearly-dead-cell/): A single cell below 1 V cannot light a white LED, which needs about 3 V. A joule thief is a tiny blocking oscillator that pumps energy from the cell in short bursts and steps the voltage up. The project builds it and mea - [LM386 audio amplifier with measured gain and frequency response](https://engineergurukul.com/resources/project-ideas/lm386-audio-amplifier-gain-and-frequency-response/): Small radios, intercoms and toy speakers use small audio power amplifiers. The LM386 gives gain of 20 or 200 with a few components. The project builds one and measures the voltage gain and how it changes with frequency, - [TV remote code decoder with a TSOP1738 receiver and Arduino](https://engineergurukul.com/resources/project-ideas/tsop1738-ir-remote-decoder-with-arduino-serial-monitor/): Infrared remotes talk to TVs and fans by sending pulses of 38 kHz light. An Arduino with a TSOP1738 receiver can decode the pulse train of each button, which teaches the idea of a protocol, and can then switch low-voltag - [Thermistor thermometer calibrated with the Steinhart-Hart equation](https://engineergurukul.com/resources/project-ideas/ntc-thermistor-thermometer-with-steinhart-hart-calibration/): A thermistor is cheap and sensitive but its resistance is not linear with temperature. By measuring resistance at three known temperatures and fitting the Steinhart-Hart equation, you can build a digital thermometer more - [LM2596 buck converter module: efficiency against load current](https://engineergurukul.com/resources/project-ideas/lm2596-buck-converter-efficiency-against-load-curve/): Phone chargers, LED drivers and solar chargers use switching converters because linear regulators waste power as heat. The project tests a ready-made LM2596 buck module and compares its efficiency with an LM7805 linear r - [PWM speed controller for a 12 V DC motor with an IR tachometer](https://engineergurukul.com/resources/project-ideas/pwm-dc-motor-speed-controller-with-ir-tachometer/): Fans, conveyors and e-rickshaws vary motor speed by switching power on and off very fast rather than wasting it in a resistor. The project builds a PWM controller, measures real rpm with an infrared sensor and plots spee - [HX711 load cell kitchen scale with calibration and an error table](https://engineergurukul.com/resources/project-ideas/hx711-load-cell-kitchen-scale-with-calibration-and-error-table/): Digital weighing scales in shops use strain-gauge load cells, which change resistance by a tiny amount when bent. An HX711 amplifier and Arduino turn that into grams. The project calibrates the scale with known masses an ### Environment, Class 11 and 12 - [How much rain your roof can catch: a measured roof yield study](https://engineergurukul.com/resources/project-ideas/roof-rainwater-yield-calculator/): The water a roof can harvest equals roof area times rainfall times a runoff factor. Measuring a real roof and using the local annual rainfall shows that even a small house in a 800 millimetre rainfall town can collect te - [Home energy audit using the meter, appliance labels and a week of logs](https://engineergurukul.com/resources/project-ideas/home-energy-audit-from-the-meter/): Reading the electricity meter daily and logging how long each appliance runs shows which ones use most of the units. In most homes a few items, such as the geyser, air conditioner, old refrigerator and ceiling fans runni - [Carbon footprint of the journey to school: petrol, bus, bicycle and walking](https://engineergurukul.com/resources/project-ideas/carbon-footprint-of-travel-to-school-by-fuel/): Burning fuel makes carbon dioxide, a greenhouse gas. By linking distance, mileage and fuel type you can estimate how much CO2 each way of getting to school sends into the air. - [Urban heat island: temperatures on road, roof, grass and under a tree](https://engineergurukul.com/resources/project-ideas/urban-heat-island-surface-temperature-transect/): Dark paved surfaces absorb more sunlight and warm up more than grass or shade. Mapping temperatures across a school or street shows how towns become hotter than the countryside. - [Dissolved solids in ten water sources measured with a TDS meter](https://engineergurukul.com/resources/project-ideas/tds-survey-of-drinking-water-sources/): Water carries dissolved salts that conduct electricity. A TDS meter reads the conductivity and converts it into parts per million, so different sources can be compared. - [How fast does rain soak in? Infiltration rate with a tin-can ring](https://engineergurukul.com/resources/project-ideas/soil-infiltration-rate-tin-can-ring/): Soil takes in water at a certain speed, called its infiltration rate. Measuring it in the playground, a field and a forest floor shows why some ground floods while other ground soaks up the monsoon. - [How much carbon does the school’s biggest tree store? Girth and height](https://engineergurukul.com/resources/project-ideas/school-tree-carbon-storage-girth-height-biomass/): A tree stores carbon taken from the air in its wood. Measuring its girth and height gives a rough estimate of its wood volume, mass and the carbon dioxide it has removed from the air. - [How strong is sunshine? Watts per square metre from a blackened katori](https://engineergurukul.com/resources/project-ideas/solar-irradiance-from-heating-water-in-a-black-can/): Sunlight carries energy. By measuring how fast the sunshine warms a known mass of water, you can estimate the power per square metre that reaches the ground, which is a guide to solar energy. - [Evaporation from pans in sun, shade and wind: millimetres a day](https://engineergurukul.com/resources/project-ideas/pan-evaporation-sun-shade-wind-crop-water-need/): Water leaves open surfaces at a rate set by heat, wind and humidity. Daily readings from identical pans show how much water a field or a tank loses and why crops need irrigation in summer. - [Weighing a fortnight of food waste: what we throw away and why](https://engineergurukul.com/resources/project-ideas/weekly-food-waste-weigh-in-household-or-canteen/): Food thrown away takes land, water and energy to produce, and it makes methane when it rots in a landfill. Weighing waste every day shows how much is wasted and where it comes from. - [Falling head permeability test on sand, silt and clay mixes](https://engineergurukul.com/resources/project-ideas/falling-head-permeability-test-for-sand-silt-and-clay-mixes/): How fast water moves through soil decides whether a field drains, a recharge pit works or an earth dam leaks. A simple falling head permeameter measures the coefficient of permeability k for sand, silt and clay mixes usi - [First flush diverter model that discards the dirty first rain from a roof](https://engineergurukul.com/resources/project-ideas/first-flush-diverter-model-for-rooftop-rainwater-tank/): The first rain after a dry spell washes dust, bird droppings and leaves off a roof. A first flush diverter fills a side pipe with that dirty water before clean water reaches the tank. The project builds one and tests tur - [Solar still yield study with three cover angles and two basin colours](https://engineergurukul.com/resources/project-ideas/solar-still-yield-study-with-three-cover-angles-and-basin-colours/): In coastal and desert regions with salty groundwater, solar stills give distilled water without fuel. The project builds a basin-type still, measures the daily yield of distilled water from salty water and compares cover - [Solar dryer cabinet against open-air drying of chilli and fruit](https://engineergurukul.com/resources/project-ideas/solar-dryer-cabinet-for-chilli-and-fruit/): A covered, ventilated box dries food faster and cleaner than open-air drying. Weighing equal slices each day shows how quickly water leaves in each method. - [Paper and sawdust briquettes: how long do they burn compared with wood?](https://engineergurukul.com/resources/project-ideas/paper-and-sawdust-fuel-briquettes-burn-test/): Waste paper, sawdust and crop leaves can be pressed into fuel blocks. Burning equal masses under adult supervision and timing a water boil shows the energy in each fuel. - [Tin-can rocket stove model that boils water with a handful of twigs](https://engineergurukul.com/resources/project-ideas/tin-can-rocket-stove-boils-water-with-twigs/): A rocket stove has an insulated chimney and a small fuel feed so the fuel burns hot and clean. Comparing the boil time against a three-stone fire shows how a design change saves fuel. - [Classroom lighting audit: lux readings and how much LEDs would save](https://engineergurukul.com/resources/project-ideas/classroom-lighting-audit-lux-readings-and-led-saving/): Measuring light levels and counting lamp hours shows where electricity is wasted. Comparing old tube lights with LED tubes on paper gives the units and rupees saved per year. - [Greywater reuse: rice-wash, soapy and tap water on bean seedlings](https://engineergurukul.com/resources/project-ideas/greywater-reuse-soapy-rice-wash-and-tap-water-on-seedlings/): Water used in the kitchen can sometimes be reused on plants, but soap can harm them. Growing seedlings with different kinds of used water shows which can be safely reused. - [Polyhouse tunnel against open bed: temperature, humidity and seedling growth](https://engineergurukul.com/resources/project-ideas/polyhouse-tunnel-against-open-bed-temperature-and-growth/): A plastic tunnel holds warmth and moisture and protects plants from wind and rain. Comparing a covered bed with an open bed shows how polyhouses extend the growing season. - [Sunlight bottle disinfection model: temperature in clear, black-backed and shaded bottles](https://engineergurukul.com/resources/project-ideas/sunlight-bottle-disinfection-temperature-test/): The solar disinfection (SODIS) method leaves clear water in sunlight for hours so heat and ultraviolet light weaken germs. Measuring temperature in different bottle set-ups shows how to make it work better. - [Recharge pit model that refills a borewell tube from roof water](https://engineergurukul.com/resources/project-ideas/recharge-pit-model-refills-a-borewell-tube/): Roof rain can be led through a filter pit into the ground to raise the water table. The model shows how a recharge pit with gravel and sand layers refills a borewell. - [Cutting pond evaporation with shade, floating balls and an oil film](https://engineergurukul.com/resources/project-ideas/cutting-pond-evaporation-shade-floating-balls-and-oil-film/): Open ponds and tanks lose a lot of water by evaporation in summer. Testing four covers on trays of water shows which method saves the most water. - [Litres per kilo of rice, wheat and vegetables: a virtual water table](https://engineergurukul.com/resources/project-ideas/litres-per-kilo-of-rice-wheat-and-vegetables-virtual-water-table/): Growing food uses a lot of water. Collecting published figures and farm data for crops shows which foods use the most water and how a family’s diet affects its water footprint. ### Computing and coding, Class 11 and 12 - [Python calculator with functions and a menu loop](https://engineergurukul.com/resources/project-ideas/python-calculator-with-functions-and-menu/): Each operation is a separate function, a while loop keeps showing a menu, and an if check stops division by zero. It shows how to organise code into reusable parts. - [Python to-do list that saves tasks in a text file](https://engineergurukul.com/resources/project-ideas/python-to-do-list-saved-in-a-text-file/): Tasks are written to a file and read back, so the list is still there the next time the program runs. It teaches file handling and lists. - [Python text adventure: find the lost key in the school](https://engineergurukul.com/resources/project-ideas/python-text-adventure-lost-in-school-building/): A dictionary of rooms links each place to the others, and a loop moves the player between them. It shows how data structures can describe a whole game world. - [Python daily diary that adds dated entries to a file](https://engineergurukul.com/resources/project-ideas/python-diary-logger-with-date-and-file-reading/): The program appends each entry with today’s date to a file and can print the whole diary. It teaches the date module and the append and read modes of files. - [Python analysis of class marks from a CSV file](https://engineergurukul.com/resources/project-ideas/python-class-marks-analysis-from-csv-file/): The program reads marks from a CSV file and finds the mean, median, highest, lowest and pass percentage. It shows how code can analyse data that a spreadsheet also holds. - [Python chatbot that replies using keyword rules](https://engineergurukul.com/resources/project-ideas/python-rule-based-chatbot-with-keywords/): The bot scans your sentence for keywords and picks a stored reply. It shows how simple chatbots work and why they fail on things they have no rule for, which is a good lesson for AI literacy. - [Python password strength checker using made-up passwords](https://engineergurukul.com/resources/project-ideas/python-password-strength-checker-for-practice-words/): The program scores a password on length, capital letters, small letters, digits and symbols. It shows how longer and mixed passwords are harder to guess and how string methods work. - [Python hangman game with a word list and six lives](https://engineergurukul.com/resources/project-ideas/python-hangman-with-word-list-and-lives/): A set stores guessed letters, a join expression shows the word with blanks and a lives counter ends the game. It combines strings, sets, loops and conditions in one program. - [Python bill generator for a kirana shop](https://engineergurukul.com/resources/project-ideas/python-kirana-shop-bill-generator-with-discount/): A price dictionary and a loop build a neat bill with totals and a discount rule. It shows how everyday billing can be programmed with formatted output. - [Python turtle drawing of the Indian tricolour with chakra](https://engineergurukul.com/resources/project-ideas/python-turtle-drawing-of-the-indian-tricolour/): A function draws filled rectangles and a loop draws 24 spokes, so the flag is built from geometry and code. It shows how functions and loops reduce repetition. - [Python summary of monthly rainfall with a text bar chart](https://engineergurukul.com/resources/project-ideas/python-monthly-rainfall-data-summary-and-text-chart/): The program stores 12 monthly rainfall values, finds the wettest month and the average, and draws a bar of hash signs for each month. It shows basic data analysis with lists. - [Python Caesar cipher with a brute-force code breaker](https://engineergurukul.com/resources/project-ideas/python-caesar-cipher-encoder-decoder-and-code-breaker/): Each letter is shifted by a key along the alphabet, and trying all 25 keys breaks the code. It shows how simple ciphers work and why they are weak. - [Python word counter that finds the ten most common words](https://engineergurukul.com/resources/project-ideas/python-word-frequency-counter-for-a-text-file/): The program reads a text file, cleans the words and counts them in a dictionary. It shows how text analysis works and which words dominate ordinary writing. - [Python tic-tac-toe for two players with a win checker](https://engineergurukul.com/resources/project-ideas/python-tic-tac-toe-two-players-with-win-check/): A list of nine cells holds the board and a list of eight winning lines is checked after each move. It shows how to model a game with data. - [Python student record manager saved in a JSON file](https://engineergurukul.com/resources/project-ideas/python-student-record-manager-with-json-file/): Records of students are stored as nested data in a JSON file and can be added, searched, updated and deleted. It is a small version of how real databases and apps keep data. - [Python attendance checker that flags students below 75 percent](https://engineergurukul.com/resources/project-ideas/python-attendance-shortage-finder-from-csv/): The program reads present and total days from a CSV, works out the percentage and writes a second file listing those below 75 percent. It shows reading, calculating and writing data in one pipeline. - [HTML and CSS one-page online resume](https://engineergurukul.com/resources/project-ideas/html-css-one-page-online-resume-for-a-student/): HTML gives the structure of a resume with sections, and CSS styles fonts, colours and spacing in a separate file. It shows how content and design are kept apart. - [HTML and CSS school magazine front page with columns](https://engineergurukul.com/resources/project-ideas/html-css-school-magazine-front-page-with-columns/): Semantic tags and CSS columns lay out an article like a newspaper page. It teaches page structure and layout with real content. - [HTML and CSS photo gallery with flexbox and hover zoom](https://engineergurukul.com/resources/project-ideas/html-css-photo-gallery-with-flexbox-and-hover-zoom/): Flexbox arranges images in a wrapping grid, and a hover rule enlarges the image under the cursor. It shows modern CSS layout without tables. - [HTML contact form with required fields and a dropdown](https://engineergurukul.com/resources/project-ideas/html-contact-form-with-validation-attributes/): Form tags collect text, a choice and a message, and HTML attributes check the input before sending. It shows how websites collect information. - [CSS navigation bar linking a three-page website](https://engineergurukul.com/resources/project-ideas/css-navigation-bar-with-hover-and-active-page/): A list of links is turned into a horizontal menu using flexbox, with hover and active-page colours. It shows how a real website’s menu is made from simple lists. - [CSS animated Diwali card with a flickering diya](https://engineergurukul.com/resources/project-ideas/css-animated-diwali-greeting-card-with-flickering-diya/): CSS keyframes make a flame flicker and a greeting fade in with no JavaScript. It shows how animation is described by start and end states. - [HTML page with a dark mode button that remembers your choice](https://engineergurukul.com/resources/project-ideas/html-dark-mode-toggle-button-remembering-choice/): A button runs a few lines of JavaScript that switch a CSS class, and localStorage keeps the choice for the next visit. It is a first step from static pages to interactive ones. - [Spreadsheet marksheet with total, percentage, grade and result](https://engineergurukul.com/resources/project-ideas/spreadsheet-marksheet-with-total-percentage-grade-and-result/): Formulas work out each student’s total, percentage, grade and pass or fail, and nested IF handles the grade bands. It shows how report cards can be calculated automatically. - [Spreadsheet attendance register using COUNTIF](https://engineergurukul.com/resources/project-ideas/spreadsheet-attendance-register-with-countif-and-75-percent-alert/): Present and absent entries are counted with COUNTIF, converted to a percentage, and flagged when below 75 percent. It shows how formulas can replace manual counting. - [Spreadsheet electricity bill estimator with unit slabs](https://engineergurukul.com/resources/project-ideas/spreadsheet-electricity-bill-estimator-with-slab-rates/): A single formula with MIN and MAX charges different rates for each block of units, as slab billing does. It shows how step-rate pricing works and how to check it. - [Spreadsheet rank list with RANK and a VLOOKUP report card](https://engineergurukul.com/resources/project-ideas/spreadsheet-class-rank-list-with-rank-and-vlookup-report/): RANK orders students by total and VLOOKUP fetches one student’s full record by roll number to fill a report card. It shows how lookup formulas turn a data table into a report. - [Spreadsheet comparing simple and compound interest over 20 years](https://engineergurukul.com/resources/project-ideas/spreadsheet-simple-and-compound-interest-comparison-chart/): Two formulas grow the same sum at the same rate, one adding the same interest each year and one adding interest on interest. The chart shows compounding pulling ahead with time. - [Spreadsheet sports day scoreboard using SUMIF](https://engineergurukul.com/resources/project-ideas/spreadsheet-sports-day-house-scoreboard-with-sumif/): Points from many events are added for each house with SUMIF, ranked and drawn as a bar chart. It shows how one list of results can produce a summary. - [Digital safety test: can friends spot fake messages?](https://engineergurukul.com/resources/project-ideas/digital-safety-spot-the-phishing-message-sorting-test/): A set of made-up messages, some genuine-looking and some fake, is sorted by friends using a checklist, and the results show which tricks work best. It teaches how to recognise phishing and scam messages. - [Media literacy: check five forwarded messages before sharing](https://engineergurukul.com/resources/project-ideas/media-literacy-check-five-forwarded-messages-before-you-share/): Forwarded claims are checked with a three-step method: who says it, when, and what do reliable sources say. It teaches how to stop false information from spreading. - [AI literacy: testing a chatbot with twenty checkable questions](https://engineergurukul.com/resources/project-ideas/ai-literacy-test-how-accurate-is-a-chatbot-on-twenty-questions/): Twenty questions with known answers are put to an AI chatbot and the answers are checked against textbooks, giving an accuracy percentage and a list of confident mistakes. It shows that AI can be useful but must be verif - [AI literacy: train an image classifier on stationery items](https://engineergurukul.com/resources/project-ideas/ai-literacy-train-an-image-classifier-with-teachable-machine/): A free browser tool learns to tell a pencil, an eraser and a sharpener from webcam examples, and testing shows how the number and variety of examples change accuracy. It teaches how machine learning learns from data. - [Digital privacy audit of app permissions with a parent](https://engineergurukul.com/resources/project-ideas/digital-privacy-audit-of-app-permissions-on-a-family-phone/): Apps on a phone are checked for the permissions they hold, such as camera, microphone and location, and compared with what they need. It teaches how to protect privacy by limiting access. - [AI literacy: can classmates tell AI-written text from student writing?](https://engineergurukul.com/resources/project-ideas/ai-literacy-can-classmates-tell-ai-text-from-student-writing/): Short paragraphs written by students and by an AI tool are mixed and shown to volunteers who guess the author. The results show how hard it is to tell and what clues people use. - [Paper flowchart for an ATM withdrawal with three PIN tries](https://engineergurukul.com/resources/project-ideas/flowchart-for-an-atm-cash-withdrawal-with-pin-retries/): A flowchart with decision diamonds and a loop describes the steps of an ATM withdrawal, including three PIN attempts and a balance check. It shows how to plan an algorithm before coding it. - [Sorting number cards by hand: bubble sort against selection sort](https://engineergurukul.com/resources/project-ideas/sorting-number-cards-by-hand-bubble-versus-selection/): Eight number cards are sorted by two methods while counting comparisons and swaps. It shows how different algorithms reach the same answer with different amounts of work. - [Binary search against linear search on a sorted roll-number list](https://engineergurukul.com/resources/project-ideas/binary-search-against-linear-search-on-a-sorted-list-of-roll-numbers/): Looking for a roll number in a sorted list is done one by one and then by halving, and the steps are counted. It shows why binary search is so much faster for large lists. - [SQL mini-database for a school library with a JOIN](https://engineergurukul.com/resources/project-ideas/sql-school-library-database-with-books-members-and-loans/): Three linked tables for books, members and loans answer questions such as who has which book, using a JOIN. It shows how real databases avoid repeating data. - [SQL stock database for a kirana shop with low-stock alerts](https://engineergurukul.com/resources/project-ideas/sql-kirana-stock-database-with-group-by-and-low-stock-alerts/): One items table answers questions on stock value by category, items running low and average price using WHERE, GROUP BY and ORDER BY. It shows how a shop can manage stock with simple queries. - [SQL cricket scorecard database with averages and strike rates](https://engineergurukul.com/resources/project-ideas/sql-cricket-scoreboard-database-with-average-and-strike-rate/): Players and match scores in two tables give totals, averages and strike rates with JOIN, GROUP BY and HAVING. It shows how statistics in sports are calculated by queries. - [SQL school bus routes database with fares and empty routes](https://engineergurukul.com/resources/project-ideas/sql-school-bus-routes-database-with-left-join-and-fare-totals/): Routes and riders are stored in two tables, and queries give riders per route, fare income and routes with nobody on them using LEFT JOIN. It teaches the difference between inner and outer joins. - [Python bank account class with deposit, withdraw and history](https://engineergurukul.com/resources/project-ideas/python-bank-account-class-with-deposit-withdraw-and-history/): A class bundles data and actions for an account, and the code raises errors for overdrawing. It introduces object oriented programming with a familiar example. - [Python explorer: prime sieve and Fibonacci golden ratio](https://engineergurukul.com/resources/project-ideas/python-prime-numbers-sieve-and-fibonacci-ratio-explorer/): One program finds primes with the Sieve of Eratosthenes and generates Fibonacci numbers whose consecutive ratio settles near 1.618. It links number patterns to loops and lists. - [Python and pandas analysis of 30 years of monthly rainfall open data](https://engineergurukul.com/resources/project-ideas/python-pandas-analysis-of-monthly-rainfall-open-data/): Farmers and city planners ask whether the monsoon is changing. A student can download a public rainfall data set, clean it with pandas and plot monthly averages, yearly totals and a trend line, which teaches data cleanin - [Library management database in SQLite with a Python command-line app](https://engineergurukul.com/resources/project-ideas/sqlite-library-management-database-with-python-command-line/): A school or a mohalla library often keeps records in a register, and books get lost. A small relational database with books, members and loans tables lets a student issue, return and search books and see overdue lists, w - [Linear regression to predict used scooter prices with scikit-learn](https://engineergurukul.com/resources/project-ideas/linear-regression-house-price-prediction-with-scikit-learn/): People who buy a second-hand vehicle want a fair price. A regression model learns from listed prices, age and kilometres how much a scooter is worth. A student can build it from an open data set or from 100 prices noted - [Flask online quiz app with SQLite score storage and a leaderboard](https://engineergurukul.com/resources/project-ideas/flask-online-quiz-app-with-sqlite-scores-and-leaderboard/): Teachers in small schools and coaching classes often mark quizzes by hand. A small web app lets students log in, answer multiple-choice questions in a browser, see their score and appear on a leaderboard. The project tea - [K-nearest neighbours classifier on the iris and wine data with a confusion matrix](https://engineergurukul.com/resources/project-ideas/knn-iris-and-wine-classifier-with-accuracy-and-confusion-matrix/): A first machine learning project should show how a computer decides from examples. The k-nearest neighbours method classifies a new flower or wine by looking at its closest known examples. A student tests how the choice - [Tkinter attendance register app with a monthly summary and CSV export](https://engineergurukul.com/resources/project-ideas/tkinter-attendance-register-app-with-csv-export-and-monthly-summary/): Many coaching centres and small workshops mark attendance in a notebook and later struggle to total it. A desktop app in Python with Tkinter can store students, mark present or absent each day, and give a percentage repo ### Physics, College and diploma - [Footstep power with piezo discs](https://engineergurukul.com/resources/project-ideas/piezo-footstep-power/): Piezoelectric discs make a small voltage when they are pressed. Many discs under a tile, with a rectifier and a capacitor, can light LEDs, though the energy from each step is very small. - [Solar cell I-V curve and maximum power point with a potentiometer load](https://engineergurukul.com/resources/project-ideas/solar-cell-iv-curve-tracer-with-potentiometer-load/): A solar panel is not a battery: its voltage and current change with the load. By plotting current against voltage and power against voltage, a student finds the maximum power point, fill factor and effect of shading, whi - [Peltier mini cooler box: temperature drop with different heat sinks](https://engineergurukul.com/resources/project-ideas/peltier-mini-cooler-box-temperature-drop-vs-heat-sink/): Mini fridges for medicines and vaccines in remote places use Peltier modules, which pump heat electrically without gas. The project builds a small insulated box and shows that how well the hot side is cooled decides how - [DC motor torque-speed curve and back EMF measured with a rope brake](https://engineergurukul.com/resources/project-ideas/dc-motor-torque-speed-curve-and-back-emf-measurement/): Selecting a motor for a robot or pump needs its torque-speed curve and efficiency. A homemade rope brake loads a small motor with known torque, while voltage, current and rpm are measured to plot the characteristics and - [Rotating-magnet coil generator: output voltage against speed and turns](https://engineergurukul.com/resources/project-ideas/rotating-magnet-coil-generator-voltage-against-speed/): Bicycle dynamos and wind turbines make electricity from a moving magnet near a coil. The project builds a model generator and tests how peak voltage depends on the speed of rotation and the number of turns, which is Fara - [Falling magnet through a coil recorded with a phone sound card](https://engineergurukul.com/resources/project-ideas/falling-magnet-through-copper-pipe-and-coil-with-phone-recording/): A magnet dropped through a coil induces a voltage pulse, and one dropped through a copper pipe falls slowly because of eddy currents. The project records both events and measures how induced voltage depends on speed and - [Slider-crank and scotch yoke models compared for piston displacement](https://engineergurukul.com/resources/project-ideas/slider-crank-and-scotch-yoke-motion-conversion-models/): Engines, compressors and pumps convert rotation to straight-line motion. A slider-crank gives a motion that is not quite sinusoidal, and a scotch yoke gives a perfect sine. The project builds both from plywood or acrylic - [Spur gear train model testing speed ratio, torque and backlash](https://engineergurukul.com/resources/project-ideas/spur-gear-train-speed-ratio-and-torque-test-model/): Gearboxes in bicycles, clocks and winches trade speed for torque. A model gear train made from salvaged toy gears or laser-cut MDF lets a student check that the speed ratio equals the inverse of the teeth ratio and measu - [Four-bar linkage wiper mechanism and its coupler curve plotted on paper](https://engineergurukul.com/resources/project-ideas/four-bar-linkage-wiper-mechanism-with-coupler-curve-plot/): Windscreen wipers, bicycle rear suspensions and door closers use four-bar linkages. A linkage turns one motion into another through four links and four pins. The project builds a crank-rocker model, traces the path of a - [Cam and follower model: three profiles and their displacement diagrams](https://engineergurukul.com/resources/project-ideas/cam-and-follower-profile-model-with-displacement-diagram/): Engine valves and sewing machines use cams to give exact timed motion. The project cuts three cam profiles, measures the follower rise at each angle and plots a displacement diagram, which shows why the shape of the prof - [Warren truss bridge from ice-cream sticks tested to failure](https://engineergurukul.com/resources/project-ideas/ice-cream-stick-warren-truss-bridge-load-to-failure/): Railway and road bridges use trusses because a triangle is rigid and each member carries either tension or compression. The project builds a Warren truss, loads it step by step until it fails, and compares the failure lo - [Model footing on sand: bearing load against footing width and depth](https://engineergurukul.com/resources/project-ideas/sand-footing-bearing-capacity-model-with-different-footing-widths/): Buildings stand on foundations that spread the load over soil. The project loads small square footings on a tray of sand and shows that a wider footing carries more total load, that in sand the failure pressure also tend - [Simply supported wooden beam: deflection test and Young’s modulus estimate](https://engineergurukul.com/resources/project-ideas/wooden-beam-deflection-test-and-youngs-modulus-estimate/): Floors, shelves and bridges bend under load. A strip of wood supported at both ends and loaded at the middle bends by an amount that depends on its depth, length and Young’s modulus. The project measures the deflection a - [Micro-hydro Pelton wheel model: electrical power against head and flow](https://engineergurukul.com/resources/project-ideas/micro-hydro-pelton-wheel-model-power-against-head-and-flow/): Hill villages in Uttarakhand, Himachal and the North East run small hydro plants on streams. A bucket wheel turned by a jet of water drives a generator. The project builds a Pelton-style wheel from spoons or cups, drives - [Savonius vertical-axis wind turbine: blade design and power coefficient test](https://engineergurukul.com/resources/project-ideas/savonius-vertical-axis-wind-turbine-blade-design-power-test/): Small wind turbines for rooftops and villages must work with turbulent, low wind speeds. A Savonius rotor made from half-cut drums or pipes works without turning to face the wind. The project builds three rotor designs, - [Suspension bridge model: cable sag, deck load and tower deflection test](https://engineergurukul.com/resources/project-ideas/suspension-bridge-model-with-cable-and-deck-load-and-sag-test/): Long river bridges in India, like the ones at Bhagalpur and Rishikesh, are cable-based structures. A model with two towers, a main cable and hangers shows how deck loads travel through the hangers to the cable and then t - [Shake table for model buildings with an MPU6050 and a base isolation test](https://engineergurukul.com/resources/project-ideas/shake-table-for-model-buildings-with-mpu6050-and-base-isolation-test/): Large parts of India lie in seismic zones, and building codes require earthquake-resistant design. A low-cost shake table moves a model building side to side at chosen frequencies. The project finds the natural frequency - [Hydraulic ram pump model from PVC fittings with a delivery head test](https://engineergurukul.com/resources/project-ideas/hydraulic-ram-pump-model-from-pvc-fittings-with-delivery-head-test/): A hydraulic ram (hydram) lifts part of the water from a stream to a much higher tank without fuel or electricity, using only the flow of water itself. It is used in hill villages. The project builds a small one from PVC - [Low temperature difference Stirling engine from tin cans run on hot water](https://engineergurukul.com/resources/project-ideas/low-temperature-difference-stirling-engine-from-tin-cans-with-hot-water/): A Stirling engine runs on any heat difference, even hot water against room air, which makes it suitable for solar and waste heat. The project builds a gamma-type engine from tin cans, a displacer and a syringe, and measu - [Doppler shift of a whirling buzzer, the idea behind galaxy redshift](https://engineergurukul.com/resources/project-ideas/doppler-whirling-buzzer-redshift/): A sound source moving towards you sounds higher in pitch, and one moving away sounds lower. Astronomers use the same idea with light to find that distant galaxies are moving away from us. ### Chemistry, College and diploma - [Vitamin C in raw and boiled vegetables with iodine and starch](https://engineergurukul.com/resources/project-ideas/vitamin-c-raw-versus-boiled-vegetables/): Vitamin C is destroyed by heat and dissolves in cooking water. A starch and iodine indicator that loses its blue colour when vitamin C is present lets you compare how much each sample contains. ### Earth and space, College and diploma - [IoT weather station](https://engineergurukul.com/resources/project-ideas/iot-weather-station/): Temperature, humidity and pressure sensors take readings every few minutes, and a Wi-Fi board sends them to a web dashboard, building up a record of the local weather. - [Measuring the dew point with a shiny can and ice](https://engineergurukul.com/resources/project-ideas/dew-point-with-an-ice-can/): The dew point is the temperature at which air becomes saturated and water starts to condense. Cooling a shiny can slowly until it mists over gives the dew point, and from dew point and air temperature the relative humidi ### Electronics and robotics, College and diploma - [Line follower robot](https://engineergurukul.com/resources/project-ideas/line-follower-robot/): IR sensors shine infrared light at the floor: white reflects it and black absorbs it. The controller reads which sensor sees the line and steers the motors to stay on it. - [Solar tracker with LDRs](https://engineergurukul.com/resources/project-ideas/solar-tracker/): Two LDRs compare the light on either side of the panel. The microcontroller turns a servo towards the brighter side, so the panel keeps facing the Sun and collects more energy through the day. - [Home automation with NodeMCU](https://engineergurukul.com/resources/project-ideas/home-automation-nodemcu/): A Wi-Fi board receives commands from a phone app or web page and switches relays, so lights and fans can be controlled from the phone and on a schedule. - [Automatic railway gate control](https://engineergurukul.com/resources/project-ideas/railway-gate-control/): IR sensors detect the train before and after the crossing. The controller closes the gate with a servo and sounds a buzzer as a train approaches, and opens it again once the train has passed. - [Fire-fighting robot](https://engineergurukul.com/resources/project-ideas/fire-fighting-robot/): Flame sensors detect the infrared light from a flame. The robot steers towards the strongest reading and switches on a small pump to spray water at it. - [Vehicle accident alert with GPS and GSM](https://engineergurukul.com/resources/project-ideas/accident-alert-gps-gsm/): An accelerometer detects a sudden impact or tilt. The controller reads the location from a GPS module and sends it by SMS through a GSM module to saved numbers. - [RFID attendance system](https://engineergurukul.com/resources/project-ideas/rfid-attendance/): Each card carries an RFID tag with a unique ID. The reader picks up the ID by radio when the card is held near it, and the controller logs the name and time. - [Gas leakage detector](https://engineergurukul.com/resources/project-ideas/gas-leakage-detector/): The resistance of an MQ-series gas sensor changes when LPG or smoke is in the air. The controller reads it and sounds a buzzer above a set level. - [Bluetooth-controlled car](https://engineergurukul.com/resources/project-ideas/bluetooth-car/): A phone app sends commands over Bluetooth to an HC-05 module. The Arduino reads them and drives the motors forwards, backwards, left and right through a motor driver. - [Phone web page that switches a 12 V LED strip through an ESP8266 relay](https://engineergurukul.com/resources/project-ideas/esp8266-web-page-switch-for-12v-led-strip/): A NodeMCU (ESP8266) joins the home Wi-Fi, runs a tiny web server and turns a relay on or off when a phone browser taps a button. The relay switches a 12 V LED strip, so the whole thing is a low-voltage copy of a smart sw - [RFID door latch that pulls a 12 V solenoid for tagged cards only](https://engineergurukul.com/resources/project-ideas/rfid-door-latch-with-12v-solenoid/): An RC522 reader reads the unique ID of a 13.56 MHz card or key fob. If the ID is in a list stored in the sketch, the Arduino fires a relay for three seconds that pulls a 12 V solenoid bolt open, and an LCD greets the use - [ESP32 energy logger measuring a 12 V load with an ACS712 current sensor](https://engineergurukul.com/resources/project-ideas/esp32-dc-energy-logger-with-acs712/): An ACS712 Hall-effect sensor measures the current through a 12 V DC load while a resistor divider measures its voltage. The ESP32 multiplies them for power, adds up watt-hours over time and shows the live figures on a ph - [Overhead tank level on your phone with automatic pump control (ESP8266)](https://engineergurukul.com/resources/project-ideas/esp8266-overhead-tank-level-with-auto-pump/): An ultrasonic sensor on the tank lid measures the distance to the water surface. The ESP8266 converts that to a percentage, shows it on a phone page, and switches a 5 V pump through a relay to refill when the level is lo - [ESP32-CAM doorbell that sends a visitor snapshot to your phone](https://engineergurukul.com/resources/project-ideas/esp32-cam-doorbell-snapshot-to-phone/): An ESP32-CAM board with its small camera takes a photo when the doorbell button is pressed or a PIR sees movement, and sends the picture to a free messaging bot on the owner's phone over Wi-Fi. It shows how a microcontro - [Earthquake alarm with an MPU6050 that cuts a 12 V supply through a relay](https://engineergurukul.com/resources/project-ideas/mpu6050-earthquake-alarm-with-cutoff-relay/): An MPU6050 accelerometer measures shaking on three axes. When the vibration stays above a level for a short time, the Arduino sounds a siren, flashes a light and opens a relay that cuts a 12 V model lighting circuit, as - [Two-zone drip irrigation with soil probes and a phone dashboard (ESP8266)](https://engineergurukul.com/resources/project-ideas/two-zone-drip-irrigation-esp8266-dashboard/): Two soil moisture probes in two pots each control their own 5 V pump through a relay, and a NodeMCU shows both moisture levels and pump states on a phone page. It demonstrates zone-wise watering, the way a farm drip syst - [Polyhouse logger that records light, temperature and humidity to an SD card](https://engineergurukul.com/resources/project-ideas/polyhouse-day-night-sd-card-logger/): An Arduino with a DS3231 clock writes a time-stamped line of light, temperature and humidity readings to a micro SD card every ten minutes. Opened in a spreadsheet, the file shows how conditions inside a covered bed diff - [Water turbidity meter using a laser pointer and an LDR](https://engineergurukul.com/resources/project-ideas/laser-and-ldr-water-turbidity-meter/): A laser beam passes through a sample bottle to an LDR; cloudy water scatters light and the LDR reading falls. The Arduino converts the reading to a clarity scale calibrated with known mixtures and shows it on an LCD, a l - [Indoor air quality logger with MQ-135, an OLED and a phone graph (ESP32)](https://engineergurukul.com/resources/project-ideas/esp32-air-quality-logger-mq135-oled/): An MQ-135 sensor responds to carbon dioxide, ammonia, smoke and other indoor pollutants. An ESP32 shows a rolling value on an OLED, keeps the last hour of readings in memory and draws them as a graph on a phone page, so - [Dust particle logger with a GP2Y1010 sensor that triggers a 12 V filter fan](https://engineergurukul.com/resources/project-ideas/gp2y1010-dust-particle-logger-with-fan-trigger/): A Sharp GP2Y1010 optical dust sensor measures airborne particles by scattered infrared light. An Arduino logs the density, shows it on an LCD and switches a 12 V fan with a cloth filter through a relay when dust rises, a - [Dual-axis solar tracker with four LDRs and two servos](https://engineergurukul.com/resources/project-ideas/dual-axis-solar-tracker-four-ldrs-two-servos/): Four LDRs in a cross with small dividing walls sense which side is brighter. Two servos tilt a small solar panel left-right and up-down until all four read the same, so the panel faces the sun. A voltmeter reading from t - [Clock-based solar tracker that follows the sun by time with a DS3231](https://engineergurukul.com/resources/project-ideas/clock-based-solar-tracker-ds3231-no-light-sensor/): Instead of light sensors, this tracker computes where the sun is from the date, time and the location, using the real-time clock, and turns a panel to that azimuth and elevation with two servos. It keeps pointing correct - [Solar panel performance logger recording volts, amps and light to an SD card](https://engineergurukul.com/resources/project-ideas/solar-panel-performance-logger-volts-amps-sd/): An Arduino measures a small panel's voltage through a divider and its current through an INA219 sensor while a load resistor draws power, and logs both with light level and time to an SD card. The data shows how output c - [Sonar radar sweep: a servo-mounted ultrasonic sensor mapping a room on a laptop](https://engineergurukul.com/resources/project-ideas/arduino-servo-sonar-radar-sweep/): Turning an ultrasonic sensor on a servo and sending angle and distance to a laptop builds a polar map of the objects around, like a radar sweep. It combines timing, servo control and serial communication. - [Model door lock opened by a 4 digit keypad code and a servo bolt](https://engineergurukul.com/resources/project-ideas/arduino-keypad-code-lock-servo-model/): The Arduino compares the keys typed with a stored code and turns a servo to slide a bolt only when they match. After three wrong tries it locks out for a minute, showing basic access control logic. - [RFID card door opener with an MFRC522 reader that logs who entered](https://engineergurukul.com/resources/project-ideas/arduino-rfid-card-door-opener-mfrc522/): A passive RFID card has no battery: the reader powers it through radio waves and reads its unique ID. The Arduino checks the ID against a list and opens a servo door for known cards only. - [Fingertip pulse sensor showing heartbeats on the Serial Plotter and a beat LED](https://engineergurukul.com/resources/project-ideas/arduino-pulse-sensor-heart-rate-demo/): Each heartbeat changes the amount of blood in the fingertip, and so changes how much light passes through or reflects. A green LED and a light sensor see this tiny change, which the Arduino turns into a beat rate. - [Self-balancing two-wheel robot using an MPU6050 and a PID loop](https://engineergurukul.com/resources/project-ideas/arduino-self-balancing-two-wheel-robot-mpu6050/): An inverted pendulum falls over unless something keeps correcting it. The robot measures its tilt hundreds of times a second and drives the wheels under the falling body, which is feedback control with a PID algorithm. - [Maze-solving robot using three ultrasonic sensors and the left-hand rule](https://engineergurukul.com/resources/project-ideas/arduino-maze-solving-robot-three-ultrasonic/): A robot that always keeps a wall on its left will find the exit of a simply connected maze. It needs three distance readings and a small decision program, which shows how robots navigate. - [Mini sumo robot that finds its opponent and stays inside the white-edged ring](https://engineergurukul.com/resources/project-ideas/arduino-mini-sumo-robot-edge-sensors/): Sumo robots search for an opponent, push it out of a black ring and stop at the white border. This needs edge detection with reflective sensors and distance sensing, with simple decision priority in the code. - [Hand-tilt glove that drives a car wirelessly using MPU6050 and nRF24L01](https://engineergurukul.com/resources/project-ideas/arduino-glove-gesture-controlled-car-nrf24/): A tilt sensor on a glove tells the car which way to go. The data is sent over a 2.4 GHz radio link by a pair of modules, so the car follows hand movements without a phone. - [Barometer and altimeter with a BMP280 that detects which floor you are on](https://engineergurukul.com/resources/project-ideas/arduino-bmp280-barometer-floor-altimeter/): Air pressure falls with height, by about 12 pascals for each metre near the ground. A BMP280 sensor can measure this so precisely that it can tell one floor of a building from the next. - [Wi-Fi signal strength heat map of a room measured with an ESP32](https://engineergurukul.com/resources/project-ideas/esp32-wifi-signal-strength-heatmap-room/): The strength of a radio signal, measured as RSSI in dBm, falls with distance and with obstacles like walls. Measuring it at grid points shows dead spots and where a router should be placed. - [Internet clock showing Indian time on an OLED, set automatically by NTP](https://engineergurukul.com/resources/project-ideas/esp8266-ntp-internet-clock-oled-ist/): Computers set their clocks by asking time servers over the internet using the Network Time Protocol. A NodeMCU can do the same and display accurate Indian Standard Time without a clock chip. - [ESP32 sensor node publishing temperature and light over MQTT to a laptop broker](https://engineergurukul.com/resources/project-ideas/esp32-mqtt-sensor-node-laptop-broker/): MQTT is the light-weight messaging method behind many IoT systems. A sensor node publishes readings under named topics, and any subscriber, such as a laptop or a phone, receives them through a broker. - [Digital kitchen scale built from a load cell, an HX711 amplifier and an Arduino](https://engineergurukul.com/resources/project-ideas/arduino-hx711-kitchen-scale-load-cell/): A load cell is a metal bar whose resistance changes by a tiny amount when it bends under a weight. The HX711 amplifies and digitises this change so the Arduino can show the mass in grams. - [Colour sorter for beads or candies using a TCS3200 sensor and two servos](https://engineergurukul.com/resources/project-ideas/arduino-tcs3200-candy-colour-sorter-servo/): The TCS3200 sensor measures how much red, green and blue light an object reflects. The Arduino classifies the colour and uses a servo to drop the object into the right bin, a small model of an industrial sorting line. - [555 monostable delay timer: calculated against measured pulse width](https://engineergurukul.com/resources/project-ideas/ne555-monostable-delay-timer-rc-calculated-vs-measured/): Staircase and passage lights, bell pushes and sample-and-hold stages all need a pulse of fixed length after a single trigger. A 555 timer in monostable mode gives such a pulse, and its length is set by one resistor and o - [LM317 adjustable 1.25 to 12 V bench supply with a load regulation test](https://engineergurukul.com/resources/project-ideas/lm317-adjustable-bench-supply-with-load-regulation-test/): Every student lab needs a variable DC supply, and shop-bought ones are costly. An LM317 regulator with two resistors gives an adjustable output. The project builds one from a 15 V adapter output and tests how much the ou - [AA cell capacity tester with a constant-current load and Arduino logging](https://engineergurukul.com/resources/project-ideas/aa-cell-capacity-tester-with-arduino-constant-current-load/): Rechargeable and cheap zinc cells carry a printed capacity that is often much higher than the truth. A constant-current load with an Arduino logger finds the real milliamp-hours of a cell by recording voltage until the c - [Joule thief that lights an LED from a nearly flat 1.2 V cell](https://engineergurukul.com/resources/project-ideas/joule-thief-led-lamp-run-from-a-nearly-dead-cell/): A single cell below 1 V cannot light a white LED, which needs about 3 V. A joule thief is a tiny blocking oscillator that pumps energy from the cell in short bursts and steps the voltage up. The project builds it and mea - [LM386 audio amplifier with measured gain and frequency response](https://engineergurukul.com/resources/project-ideas/lm386-audio-amplifier-gain-and-frequency-response/): Small radios, intercoms and toy speakers use small audio power amplifiers. The LM386 gives gain of 20 or 200 with a few components. The project builds one and measures the voltage gain and how it changes with frequency, - [TV remote code decoder with a TSOP1738 receiver and Arduino](https://engineergurukul.com/resources/project-ideas/tsop1738-ir-remote-decoder-with-arduino-serial-monitor/): Infrared remotes talk to TVs and fans by sending pulses of 38 kHz light. An Arduino with a TSOP1738 receiver can decode the pulse train of each button, which teaches the idea of a protocol, and can then switch low-voltag - [Thermistor thermometer calibrated with the Steinhart-Hart equation](https://engineergurukul.com/resources/project-ideas/ntc-thermistor-thermometer-with-steinhart-hart-calibration/): A thermistor is cheap and sensitive but its resistance is not linear with temperature. By measuring resistance at three known temperatures and fitting the Steinhart-Hart equation, you can build a digital thermometer more - [LM2596 buck converter module: efficiency against load current](https://engineergurukul.com/resources/project-ideas/lm2596-buck-converter-efficiency-against-load-curve/): Phone chargers, LED drivers and solar chargers use switching converters because linear regulators waste power as heat. The project tests a ready-made LM2596 buck module and compares its efficiency with an LM7805 linear r - [PWM speed controller for a 12 V DC motor with an IR tachometer](https://engineergurukul.com/resources/project-ideas/pwm-dc-motor-speed-controller-with-ir-tachometer/): Fans, conveyors and e-rickshaws vary motor speed by switching power on and off very fast rather than wasting it in a resistor. The project builds a PWM controller, measures real rpm with an infrared sensor and plots spee - [HX711 load cell kitchen scale with calibration and an error table](https://engineergurukul.com/resources/project-ideas/hx711-load-cell-kitchen-scale-with-calibration-and-error-table/): Digital weighing scales in shops use strain-gauge load cells, which change resistance by a tiny amount when bent. An HX711 amplifier and Arduino turn that into grams. The project calibrates the scale with known masses an - [LoRa point-to-point sensor link: range and packet loss between two ESP32 nodes](https://engineergurukul.com/resources/project-ideas/lora-point-to-point-link-range-test-between-two-esp32-nodes/): Wi-Fi does not reach farms, dams or hill villages. LoRa radio reaches kilometres on a few milliwatts. The project builds a transmitter that sends soil moisture and temperature and a receiver that shows them, then measure - [MQTT sensor network of three ESP32 nodes with a Mosquitto broker and Node-RED](https://engineergurukul.com/resources/project-ideas/mqtt-sensor-network-of-three-esp32-nodes-with-mosquitto-and-node-red/): Factories and smart buildings send small readings from many sensors to one place. MQTT is the light-weight publish-subscribe protocol for this. The project builds three ESP32 nodes that publish readings to a broker on a - [GPS track logger with SD card storage and route plot on an open map](https://engineergurukul.com/resources/project-ideas/gps-track-logger-with-sd-card-and-route-plot-on-openstreetmap/): Delivery vans, school buses and trekkers need a record of where they went. A battery-powered logger with a GPS module stores time, position and speed on an SD card, and a Python script plots the track on a map and finds - [MAX30102 pulse rate and SpO2 monitor compared with manual pulse counts](https://engineergurukul.com/resources/project-ideas/max30102-pulse-and-spo2-monitor-compared-with-manual-count/): A pulse oximeter clips on a finger and shows pulse and blood oxygen using red and infrared light. A student can build a low-cost model with a MAX30102 sensor and an Arduino, display the readings, and test the pulse rate - [Fingerprint attendance system with an R307 sensor, RTC and SD card log](https://engineergurukul.com/resources/project-ideas/fingerprint-attendance-system-with-r307-sensor-and-sd-card-log/): Proxy attendance is a problem in classes and workshops. A fingerprint module identifies a person on the spot and a log records the time. The project builds a stand-alone attendance box and a Python script that converts t - [Traffic signal controller in register-level C on an ATmega328P with a pedestrian request](https://engineergurukul.com/resources/project-ideas/atmega328p-register-level-traffic-controller-with-pedestrian-request/): Arduino code hides what a microcontroller does. Writing the program straight to the ATmega328P registers shows how ports, timers and interrupts work. The project builds a four-way traffic signal model with a state machin - [Smart pill box with RTC reminders, lid sensors and a missed-dose log](https://engineergurukul.com/resources/project-ideas/smart-pill-box-with-rtc-reminders-and-missed-dose-log/): Elderly patients often forget tablets. A seven-compartment box with an RTC alarm, LEDs and lid sensors can remind the user, detect which lid opened and record missed doses for a caregiver. The project designs and tests t - [PWM solar charge controller for a 12 V 7 Ah battery with cut-offs and logging](https://engineergurukul.com/resources/project-ideas/pwm-solar-charge-controller-for-12v-lead-acid-battery-with-cut-offs/): Small solar lighting systems fail when batteries are overcharged or deeply discharged. A charge controller protects them. The project builds one with an Arduino, a MOSFET switch and voltage and current sensing, with thre - [Four-axis servo robot arm with inverse kinematics solved in Python](https://engineergurukul.com/resources/project-ideas/four-dof-servo-robot-arm-with-inverse-kinematics-in-python/): Factory robots must place a gripper at an exact point. Inverse kinematics finds the joint angles that reach a point. The project builds a four-axis arm from acrylic and servos and solves the angles by trigonometry in Pyt - [Self-balancing two-wheel robot with an MPU6050, complementary filter and PID](https://engineergurukul.com/resources/project-ideas/self-balancing-two-wheel-robot-with-mpu6050-complementary-filter-and-pid/): A two-wheel robot is an inverted pendulum and falls unless it moves under itself fast enough. The project builds one with a gyroscope and accelerometer, fuses their data, and tunes a PID controller until the robot stands ### Environment, College and diploma - [Water quality monitor](https://engineergurukul.com/resources/project-ideas/water-quality-monitor/): A TDS sensor estimates dissolved solids from how well the water conducts, a turbidity sensor measures how cloudy it is, and a pH sensor shows its acidity. The readings show whether a source needs treatment, but only a la - [Home energy audit using the meter, appliance labels and a week of logs](https://engineergurukul.com/resources/project-ideas/home-energy-audit-from-the-meter/): Reading the electricity meter daily and logging how long each appliance runs shows which ones use most of the units. In most homes a few items, such as the geyser, air conditioner, old refrigerator and ceiling fans runni - [Falling head permeability test on sand, silt and clay mixes](https://engineergurukul.com/resources/project-ideas/falling-head-permeability-test-for-sand-silt-and-clay-mixes/): How fast water moves through soil decides whether a field drains, a recharge pit works or an earth dam leaks. A simple falling head permeameter measures the coefficient of permeability k for sand, silt and clay mixes usi - [First flush diverter model that discards the dirty first rain from a roof](https://engineergurukul.com/resources/project-ideas/first-flush-diverter-model-for-rooftop-rainwater-tank/): The first rain after a dry spell washes dust, bird droppings and leaves off a roof. A first flush diverter fills a side pipe with that dirty water before clean water reaches the tank. The project builds one and tests tur - [Next-day air quality index forecast for a city using open CPCB-style data](https://engineergurukul.com/resources/project-ideas/city-aqi-forecast-from-cpcb-open-data-with-lag-features/): Winter smog in north Indian cities makes people ask whether tomorrow will be worse. A model using yesterday’s pollutant levels, season and weather can give a rough forecast. The project builds one from public daily air q - [Kitchen waste biogas digester model: gas yield measured over three weeks](https://engineergurukul.com/resources/project-ideas/kitchen-waste-biogas-digester-model-gas-yield-over-three-weeks/): Biogas plants turn cow dung and kitchen waste into cooking gas and compost, and many villages already use them. A 20 litre model digester shows how temperature and feed change the gas produced. The project measures daily - [Solar still yield study with three cover angles and two basin colours](https://engineergurukul.com/resources/project-ideas/solar-still-yield-study-with-three-cover-angles-and-basin-colours/): In coastal and desert regions with salty groundwater, solar stills give distilled water without fuel. The project builds a basin-type still, measures the daily yield of distilled water from salty water and compares cover - [Constructed wetland model that treats kitchen greywater with reeds and gravel](https://engineergurukul.com/resources/project-ideas/constructed-wetland-greywater-treatment-model-with-reed-bed-and-gravel/): Many colonies and farms have no sewage treatment for sink and bath water. A bed of gravel planted with reeds can clean greywater cheaply. The project builds a small horizontal-flow bed, feeds it with diluted kitchen grey - [Rooftop rainwater tank sizing with Python and 20 years of daily rainfall](https://engineergurukul.com/resources/project-ideas/rooftop-rainwater-tank-sizing-with-python-and-20-years-of-rainfall/): Households asking how big a rainwater tank should be often get rule-of-thumb answers. A daily water-balance simulation using 20 years of local rainfall, a roof area and the family demand shows what percentage of demand a - [Low-cost soil testing kit: sieve analysis, plasticity and compaction for three sites](https://engineergurukul.com/resources/project-ideas/field-soil-testing-kit-sieve-analysis-liquid-limit-and-proctor-style-compaction/): Before any road, school building or pond is built, the soil must be tested, but lab tests cost money. A student kit of sieves, a cone for plasticity and a small compaction mould can classify soils from three real sites. ### Computing and coding, College and diploma - [Python student record manager saved in a JSON file](https://engineergurukul.com/resources/project-ideas/python-student-record-manager-with-json-file/): Records of students are stored as nested data in a JSON file and can be added, searched, updated and deleted. It is a small version of how real databases and apps keep data. - [Python attendance checker that flags students below 75 percent](https://engineergurukul.com/resources/project-ideas/python-attendance-shortage-finder-from-csv/): The program reads present and total days from a CSV, works out the percentage and writes a second file listing those below 75 percent. It shows reading, calculating and writing data in one pipeline. - [Spreadsheet attendance register using COUNTIF](https://engineergurukul.com/resources/project-ideas/spreadsheet-attendance-register-with-countif-and-75-percent-alert/): Present and absent entries are counted with COUNTIF, converted to a percentage, and flagged when below 75 percent. It shows how formulas can replace manual counting. - [Spreadsheet electricity bill estimator with unit slabs](https://engineergurukul.com/resources/project-ideas/spreadsheet-electricity-bill-estimator-with-slab-rates/): A single formula with MIN and MAX charges different rates for each block of units, as slab billing does. It shows how step-rate pricing works and how to check it. - [Spreadsheet rank list with RANK and a VLOOKUP report card](https://engineergurukul.com/resources/project-ideas/spreadsheet-class-rank-list-with-rank-and-vlookup-report/): RANK orders students by total and VLOOKUP fetches one student’s full record by roll number to fill a report card. It shows how lookup formulas turn a data table into a report. - [Spreadsheet comparing simple and compound interest over 20 years](https://engineergurukul.com/resources/project-ideas/spreadsheet-simple-and-compound-interest-comparison-chart/): Two formulas grow the same sum at the same rate, one adding the same interest each year and one adding interest on interest. The chart shows compounding pulling ahead with time. - [AI literacy: testing a chatbot with twenty checkable questions](https://engineergurukul.com/resources/project-ideas/ai-literacy-test-how-accurate-is-a-chatbot-on-twenty-questions/): Twenty questions with known answers are put to an AI chatbot and the answers are checked against textbooks, giving an accuracy percentage and a list of confident mistakes. It shows that AI can be useful but must be verif - [Digital privacy audit of app permissions with a parent](https://engineergurukul.com/resources/project-ideas/digital-privacy-audit-of-app-permissions-on-a-family-phone/): Apps on a phone are checked for the permissions they hold, such as camera, microphone and location, and compared with what they need. It teaches how to protect privacy by limiting access. - [AI literacy: can classmates tell AI-written text from student writing?](https://engineergurukul.com/resources/project-ideas/ai-literacy-can-classmates-tell-ai-text-from-student-writing/): Short paragraphs written by students and by an AI tool are mixed and shown to volunteers who guess the author. The results show how hard it is to tell and what clues people use. - [Binary search against linear search on a sorted roll-number list](https://engineergurukul.com/resources/project-ideas/binary-search-against-linear-search-on-a-sorted-list-of-roll-numbers/): Looking for a roll number in a sorted list is done one by one and then by halving, and the steps are counted. It shows why binary search is so much faster for large lists. - [SQL mini-database for a school library with a JOIN](https://engineergurukul.com/resources/project-ideas/sql-school-library-database-with-books-members-and-loans/): Three linked tables for books, members and loans answer questions such as who has which book, using a JOIN. It shows how real databases avoid repeating data. - [SQL stock database for a kirana shop with low-stock alerts](https://engineergurukul.com/resources/project-ideas/sql-kirana-stock-database-with-group-by-and-low-stock-alerts/): One items table answers questions on stock value by category, items running low and average price using WHERE, GROUP BY and ORDER BY. It shows how a shop can manage stock with simple queries. - [SQL cricket scorecard database with averages and strike rates](https://engineergurukul.com/resources/project-ideas/sql-cricket-scoreboard-database-with-average-and-strike-rate/): Players and match scores in two tables give totals, averages and strike rates with JOIN, GROUP BY and HAVING. It shows how statistics in sports are calculated by queries. - [SQL school bus routes database with fares and empty routes](https://engineergurukul.com/resources/project-ideas/sql-school-bus-routes-database-with-left-join-and-fare-totals/): Routes and riders are stored in two tables, and queries give riders per route, fare income and routes with nobody on them using LEFT JOIN. It teaches the difference between inner and outer joins. - [Python bank account class with deposit, withdraw and history](https://engineergurukul.com/resources/project-ideas/python-bank-account-class-with-deposit-withdraw-and-history/): A class bundles data and actions for an account, and the code raises errors for overdrawing. It introduces object oriented programming with a familiar example. - [Python and pandas analysis of 30 years of monthly rainfall open data](https://engineergurukul.com/resources/project-ideas/python-pandas-analysis-of-monthly-rainfall-open-data/): Farmers and city planners ask whether the monsoon is changing. A student can download a public rainfall data set, clean it with pandas and plot monthly averages, yearly totals and a trend line, which teaches data cleanin - [Library management database in SQLite with a Python command-line app](https://engineergurukul.com/resources/project-ideas/sqlite-library-management-database-with-python-command-line/): A school or a mohalla library often keeps records in a register, and books get lost. A small relational database with books, members and loans tables lets a student issue, return and search books and see overdue lists, w - [Linear regression to predict used scooter prices with scikit-learn](https://engineergurukul.com/resources/project-ideas/linear-regression-house-price-prediction-with-scikit-learn/): People who buy a second-hand vehicle want a fair price. A regression model learns from listed prices, age and kilometres how much a scooter is worth. A student can build it from an open data set or from 100 prices noted - [Flask online quiz app with SQLite score storage and a leaderboard](https://engineergurukul.com/resources/project-ideas/flask-online-quiz-app-with-sqlite-scores-and-leaderboard/): Teachers in small schools and coaching classes often mark quizzes by hand. A small web app lets students log in, answer multiple-choice questions in a browser, see their score and appear on a leaderboard. The project tea - [K-nearest neighbours classifier on the iris and wine data with a confusion matrix](https://engineergurukul.com/resources/project-ideas/knn-iris-and-wine-classifier-with-accuracy-and-confusion-matrix/): A first machine learning project should show how a computer decides from examples. The k-nearest neighbours method classifies a new flower or wine by looking at its closest known examples. A student tests how the choice - [Tkinter attendance register app with a monthly summary and CSV export](https://engineergurukul.com/resources/project-ideas/tkinter-attendance-register-app-with-csv-export-and-monthly-summary/): Many coaching centres and small workshops mark attendance in a notebook and later struggle to total it. A desktop app in Python with Tkinter can store students, mark present or absent each day, and give a percentage repo - [Seasonal rainfall prediction for a district with a random forest model](https://engineergurukul.com/resources/project-ideas/district-rainfall-prediction-random-forest-from-imd-style-open-data/): Farmers decide sowing dates and reservoir managers plan releases using rainfall outlooks. The project builds a machine learning model that predicts the coming month’s rainfall of one district from past rainfall and tempe - [Clinic OPD appointment and patient queue system with Flask and SQLite](https://engineergurukul.com/resources/project-ideas/opd-appointment-and-patient-queue-system-with-flask-and-sqlite/): Small clinics and government dispensaries have long queues and paper registers. A web application that books slots, assigns token numbers and shows the doctor the day’s queue reduces waiting and lost files. The project d - [Handwritten digit recognition with a CNN on MNIST and a browser demo](https://engineergurukul.com/resources/project-ideas/cnn-handwritten-digit-recognition-on-mnist-with-browser-demo/): Cheque and form readers recognise handwriting. A small convolutional neural network learns to read digits from the open MNIST data set. The project trains it on a laptop, tests accuracy, studies the errors and builds a w - [SMS spam classifier using Naive Bayes with a web form and error analysis](https://engineergurukul.com/resources/project-ideas/sms-spam-classifier-naive-bayes-with-web-form-and-evaluation/): Fake lottery, loan and KYC messages reach millions of phones. A Naive Bayes classifier learns spam words from labelled messages. The project trains on an open SMS data set, measures precision and recall and builds a smal - [Kirana shop inventory and billing web app that prints GST invoices as PDF](https://engineergurukul.com/resources/project-ideas/kirana-shop-inventory-and-billing-web-app-with-gst-invoice-pdf/): Neighbourhood shops often use handwritten bills and lose track of stock. A web application that records products, stock, purchases and sales, calculates GST on each bill and warns of low stock can fit that need. The proj - [Plant leaf disease classifier using transfer learning on an open image set](https://engineergurukul.com/resources/project-ideas/plant-leaf-disease-classifier-with-transfer-learning-on-open-images/): Farmers lose crops to diseases that are spotted too late. A neural network trained on leaf photographs can suggest the likely disease. The project fine-tunes a pretrained image model on a subset of an open plant leaf dat - [City bus route and fare finder using Dijkstra’s algorithm on a graph](https://engineergurukul.com/resources/project-ideas/bus-route-finder-using-dijkstra-algorithm-on-a-city-graph/): Commuters in a town often do not know which buses to take or where to change. Modelling stops as nodes and bus links as weighted edges lets Dijkstra’s algorithm find the shortest or cheapest route. The project builds the - [Student marks analytics dashboard with pandas and Streamlit](https://engineergurukul.com/resources/project-ideas/student-marks-analytics-dashboard-with-pandas-and-streamlit/): Teachers have term marks in spreadsheets but rarely get quick views of weak topics, class comparisons or students at risk. A Streamlit dashboard reads a marks file and shows distributions, correlations and a list of stud ## Free learning for kids (136 lessons) - [Kids library](https://engineergurukul.com/resources/kids/) - [Printable books](https://engineergurukul.com/resources/kids/books/) - [Practice worksheets](https://engineergurukul.com/resources/kids/worksheets/) - [Reference sheets](https://engineergurukul.com/resources/kids/reference/) - [Kids glossary](https://engineergurukul.com/resources/kids/glossary/) - [Find out more](https://engineergurukul.com/resources/kids/learn-more/) - [How to find good information](https://engineergurukul.com/resources/kids/how-to-search/) - [Maths for classes 1 and 2](https://engineergurukul.com/resources/kids/books/maths-1-2/): 4 lessons - [Science for classes 1 and 2](https://engineergurukul.com/resources/kids/books/science-1-2/): 4 lessons - [English for classes 1 and 2](https://engineergurukul.com/resources/kids/books/english-1-2/): 6 lessons - [Drawing and craft for classes 1 and 2](https://engineergurukul.com/resources/kids/books/art-1-2/): 4 lessons - [Life skills and money for classes 1 and 2](https://engineergurukul.com/resources/kids/books/life-1-2/): 6 lessons - [Health and safety for classes 1 and 2](https://engineergurukul.com/resources/kids/books/health-1-2/): 5 lessons - [Maths for classes 3 to 5](https://engineergurukul.com/resources/kids/books/maths-3-5/): 4 lessons - [Science for classes 3 to 5](https://engineergurukul.com/resources/kids/books/science-3-5/): 9 lessons - [English for classes 3 to 5](https://engineergurukul.com/resources/kids/books/english-3-5/): 5 lessons - [Hindi for classes 3 to 5](https://engineergurukul.com/resources/kids/books/hindi-3-5/): 8 lessons - [General knowledge for classes 3 to 5](https://engineergurukul.com/resources/kids/books/gk-3-5/): 7 lessons - [Drawing and craft for classes 3 to 5](https://engineergurukul.com/resources/kids/books/art-3-5/): 5 lessons - [Life skills and money for classes 3 to 5](https://engineergurukul.com/resources/kids/books/life-3-5/): 3 lessons - [Health and safety for classes 3 to 5](https://engineergurukul.com/resources/kids/books/health-3-5/): 5 lessons - [Maths for classes 6 to 8](https://engineergurukul.com/resources/kids/books/maths-6-8/): 4 lessons - [Science for classes 6 to 8](https://engineergurukul.com/resources/kids/books/science-6-8/): 4 lessons - [English for classes 6 to 8](https://engineergurukul.com/resources/kids/books/english-6-8/): 7 lessons - [Hindi for classes 6 to 8](https://engineergurukul.com/resources/kids/books/hindi-6-8/): 6 lessons - [Computers and coding for classes 6 to 8](https://engineergurukul.com/resources/kids/books/computers-6-8/): 8 lessons - [Maths for classes 9 and 10](https://engineergurukul.com/resources/kids/books/maths-9-10/): 7 lessons - [Computers and coding for classes 9 and 10](https://engineergurukul.com/resources/kids/books/computers-9-10/): 6 lessons - [Counting and number names](https://engineergurukul.com/resources/kids/counting-and-number-names/): Count from 1 to 100, learn tens and ones, and write number names like seven, fifteen and forty. - [Adding and subtracting up to 100](https://engineergurukul.com/resources/kids/adding-and-subtracting-to-100/): Add and subtract two-digit numbers using tens and ones, with carrying and borrowing explained step by step. - [Shapes around us](https://engineergurukul.com/resources/kids/shapes-around-us/): Meet circles, squares, rectangles and triangles, count their sides and corners, and spot solid shapes at home. - [Reading the clock](https://engineergurukul.com/resources/kids/reading-the-clock/): Learn the short and long hands, tell the time in hours, half past and quarter past, and count minutes in fives. - [Multiplication tables made easy](https://engineergurukul.com/resources/kids/multiplication-tables/): Understand multiplication as repeated addition and learn tricks and patterns that make tables easy to remember. - [Division: sharing equally](https://engineergurukul.com/resources/kids/division-sharing-equally/): Learn division as equal sharing and equal grouping, see how it links to multiplication, and handle remainders. - [Fractions: parts of a whole](https://engineergurukul.com/resources/kids/fractions-parts-of-a-whole/): Learn what numerators and denominators mean, compare fractions, find equal fractions and take fractions of a group. - [Perimeter and area](https://engineergurukul.com/resources/kids/perimeter-and-area/): Find the distance around a shape (perimeter) and the space inside it (area) for rectangles, squares and triangles. - [Factors, multiples and prime numbers](https://engineergurukul.com/resources/kids/factors-multiples-and-primes/): Find factors and multiples, spot prime and composite numbers, use divisibility tests, and work out HCF and LCM. - [Decimals and percentages](https://engineergurukul.com/resources/kids/decimals-and-percentages/): Understand tenths and hundredths, change between fractions, decimals and percentages, and work out discounts. - [Ratio and proportion](https://engineergurukul.com/resources/kids/ratio-and-proportion/): Compare quantities with ratios, simplify them, check proportion and use the unitary method to solve everyday problems. - [Algebra: first steps](https://engineergurukul.com/resources/kids/algebra-first-steps/): Use letters for unknown numbers, write simple expressions and solve equations by keeping both sides balanced. - [Pythagoras theorem](https://engineergurukul.com/resources/kids/pythagoras-theorem/): In a right-angled triangle, the square on the longest side equals the sum of the squares on the other two sides. - [Mean, median and mode](https://engineergurukul.com/resources/kids/mean-median-and-mode/): Summarise a set of numbers with the mean, median and mode, and learn when each one gives the best picture of the data. - [Living and non-living things](https://engineergurukul.com/resources/kids/living-and-non-living-things/): Learn how to tell living things like plants and animals from non-living things like stones, chairs and toys. - [Parts of a plant](https://engineergurukul.com/resources/kids/parts-of-a-plant/): Meet the roots, stem, leaves, flower, fruit and seed of a plant and learn what each part does for the plant. - [Our five senses](https://engineergurukul.com/resources/kids/our-five-senses/): Discover how your eyes, ears, nose, tongue and skin help you see, hear, smell, taste and touch the world. - [Water all around us](https://engineergurukul.com/resources/kids/water-all-around-us/): Find out where water comes from, how we use it every day, and simple ways to keep it clean and save it. - [Solids, liquids and gases](https://engineergurukul.com/resources/kids/solids-liquids-and-gases/): Learn the three states of matter, how their particles behave, and how heating and cooling change one state into another. - [The water cycle](https://engineergurukul.com/resources/kids/the-water-cycle/): See how water goes round and round: evaporation, condensation, rain and back to rivers and the sea, all powered by the Sun. - [Food chains and food webs](https://engineergurukul.com/resources/kids/food-chains-and-food-webs/): Follow food and energy from the Sun to plants, plant-eaters and meat-eaters, and see how food chains join into food webs. - [Our solar system](https://engineergurukul.com/resources/kids/our-solar-system/): Tour the Sun and its eight planets in order, from Mercury to Neptune, and learn a few key facts about each one. - [Simple electric circuits](https://engineergurukul.com/resources/kids/simple-electric-circuits/): Build a safe circuit with a cell, bulb and switch, and learn about conductors, insulators and why a circuit must be closed. - [Light, shadows and reflection](https://engineergurukul.com/resources/kids/light-and-shadows/): Learn how light travels in straight lines, why objects make shadows, and how a mirror reflects light and flips left and right. - [Separating mixtures](https://engineergurukul.com/resources/kids/separating-mixtures/): Learn how to separate mixtures with hand-picking, winnowing, sieving, sedimentation, filtration, evaporation and magnets. - [How plants make food: photosynthesis](https://engineergurukul.com/resources/kids/photosynthesis/): Find out how green leaves use sunlight, water and carbon dioxide to make food and give out oxygen: photosynthesis. - [Acids, bases and salts](https://engineergurukul.com/resources/kids/acids-bases-and-salts/): Understand acids, bases, indicators, the pH scale, neutralisation and the common salts we use, with balanced equations. - [Newton's laws of motion](https://engineergurukul.com/resources/kids/newtons-laws-of-motion/): Learn the three laws of motion: inertia, force equals mass times acceleration, and equal and opposite reactions, with worked sums. - [The alphabet and phonics](https://engineergurukul.com/resources/kids/alphabet-and-phonics/): Learn the 26 letters, which five are vowels, and how sounds blend to make simple words like cat and sun. - [Making simple sentences](https://engineergurukul.com/resources/kids/making-simple-sentences/): A sentence tells a complete thought. Learn to build simple sentences with a capital letter, a naming word and a doing word. - [Nouns and pronouns](https://engineergurukul.com/resources/kids/nouns-and-pronouns/): Nouns name people, places, animals and things. Pronouns take their place. Learn to tell them apart and use them well. - [Verbs and tenses](https://engineergurukul.com/resources/kids/verbs-and-tenses/): Verbs are action words. Learn how they change to show the past, the present and the future. - [Adjectives and describing words](https://engineergurukul.com/resources/kids/adjectives-and-describing-words/): Adjectives describe nouns and make your writing colourful. Learn to use them and to compare things. - [Punctuation made easy](https://engineergurukul.com/resources/kids/punctuation-made-easy/): Full stops, commas, question marks, apostrophes and speech marks make writing clear. Learn when to use each one. - [Writing a good paragraph](https://engineergurukul.com/resources/kids/writing-a-good-paragraph/): A good paragraph has a topic sentence, supporting details and a closing sentence. Learn to plan and write one. - [Active and passive voice](https://engineergurukul.com/resources/kids/active-and-passive-voice/): In active voice the doer acts; in passive voice the action is done to something. Learn to change one into the other. - [Writing a formal letter](https://engineergurukul.com/resources/kids/writing-a-formal-letter/): Learn the parts of a formal letter, from the sender address to the closing, and how to write in a polite, clear tone. - [Hindi vowels and matras (स्वर और मात्राएँ)](https://engineergurukul.com/resources/kids/hindi-swar-and-matras/): हिंदी के स्वर पहचानो और सीखो कि मात्राएँ व्यंजन से जुड़कर शब्दों को कैसे बनाती हैं। - [Hindi consonants (vyanjan) (व्यंजन)](https://engineergurukul.com/resources/kids/hindi-vyanjan-consonants/): हिंदी के 33 व्यंजन वर्गों में सीखो: क-वर्ग से प-वर्ग तक, फिर य र ल व, श ष स ह और संयुक्त अक्षर। - [Nouns in Hindi (संज्ञा)](https://engineergurukul.com/resources/kids/hindi-sangya-nouns/): संज्ञा किसी व्यक्ति, वस्तु, स्थान या भाव का नाम है। जानो संज्ञा के तीन भेद: व्यक्तिवाचक, जातिवाचक और भाववाचक। - [Gender and number in Hindi (लिंग और वचन)](https://engineergurukul.com/resources/kids/hindi-ling-and-vachan/): लिंग से पता चलता है कि शब्द पुल्लिंग है या स्त्रीलिंग, और वचन से कि एक है या अनेक। जोड़ियों से सीखो। - [Opposite words in Hindi (विलोम शब्द)](https://engineergurukul.com/resources/kids/hindi-vilom-shabd/): विलोम शब्द एक-दूसरे के उलटे अर्थ वाले शब्द होते हैं। दिन-रात, सच-झूठ जैसी जोड़ियाँ बनाना सीखो। - [Verbs and tenses in Hindi (क्रिया और काल)](https://engineergurukul.com/resources/kids/hindi-kriya-and-kaal/): क्रिया काम का बोध कराती है और काल बताता है कि काम कब हुआ। भूत, वर्तमान और भविष्यत् काल के रूप सीखो। - [Parts of a computer](https://engineergurukul.com/resources/kids/parts-of-a-computer/): Meet the monitor, keyboard, mouse and CPU, and learn what each part of a computer does with simple examples. - [Mouse and keyboard basics](https://engineergurukul.com/resources/kids/mouse-and-keyboard-basics/): Learn how to point, click and scroll with a mouse, and what the space bar, Enter, Shift and Backspace keys do. - [Algorithms: instructions step by step](https://engineergurukul.com/resources/kids/algorithms-step-by-step/): An algorithm is a list of clear steps in the right order. Learn to write, test and fix algorithms on paper. - [Staying safe online](https://engineergurukul.com/resources/kids/staying-safe-online/): Learn simple rules for staying safe online: keep private things private, make strong passwords and tell a trusted adult. - [Loops and patterns](https://engineergurukul.com/resources/kids/loops-and-patterns/): Learn how a loop repeats steps, how to spot patterns, and how to write long instructions in a short way. - [If-then decisions (conditions)](https://engineergurukul.com/resources/kids/if-then-decisions/): Learn how computers make choices using if, then and else, with true or false conditions and flowcharts. - [Binary numbers: how computers count](https://engineergurukul.com/resources/kids/binary-numbers-basics/): Computers use only 0 and 1. Learn place values 1, 2, 4, 8, 16 and how to change numbers to binary and back. - [How the internet works](https://engineergurukul.com/resources/kids/how-the-internet-works/): See how the internet connects devices: clients, servers, routers, IP addresses, domain names and data packets. - [National symbols of India](https://engineergurukul.com/resources/kids/national-symbols-of-india/): Meet the national flag, emblem, anthem, bird, animal, flower, fruit and tree that stand for India. - [Continents and oceans](https://engineergurukul.com/resources/kids/continents-and-oceans/): Learn the seven continents and five oceans of Earth, where India is, and simple ways to remember their names. - [Festivals of India](https://engineergurukul.com/resources/kids/festivals-of-india/): Discover festivals celebrated across India, such as Diwali, Holi, Eid, Christmas, Pongal and Onam, with respect for all. - [States and union territories of India](https://engineergurukul.com/resources/kids/states-and-union-territories/): India has 28 states and 8 union territories. Learn the difference between them and some state capitals. - [How India is governed](https://engineergurukul.com/resources/kids/how-india-is-governed/): Learn how India is governed: Parliament, the President, the Prime Minister, the courts and local government. - [The Constitution, the Preamble and our rights](https://engineergurukul.com/resources/kids/constitution-preamble-and-rights/): Understand the Indian Constitution, the words of the Preamble, and the six fundamental rights every citizen has. - [Drawing with shapes](https://engineergurukul.com/resources/kids/drawing-with-shapes/): Learn to draw houses, trees and more by joining simple shapes: circles, squares, rectangles and triangles. - [Colours and mixing](https://engineergurukul.com/resources/kids/colours-and-mixing/): Meet the three primary colours of paint, red, yellow and blue, and see how mixing them makes orange, green and purple. - [Symmetry and rangoli patterns](https://engineergurukul.com/resources/kids/symmetry-and-rangoli/): Discover lines of symmetry in shapes, letters and rangoli, and learn to draw a pattern whose two halves match. - [Crafts from waste paper](https://engineergurukul.com/resources/kids/crafts-from-waste-paper/): Turn clean old newspaper and paper into pen stands and paper beads, and learn why reusing paper helps the Earth. - [One-point perspective drawing](https://engineergurukul.com/resources/kids/one-point-perspective/): Learn how artists use a horizon line and one vanishing point to make a flat page look like a road or street going far away. - [Coins and notes: our money](https://engineergurukul.com/resources/kids/coins-and-notes/): Learn the rupee, coins and notes we use every day, how to add money, and how to count change when we shop. - [Good manners and kindness](https://engineergurukul.com/resources/kids/good-manners-and-kindness/): Learn the magic words please, thank you and sorry, and simple ways to be polite, share and be kind at home and school. - [Saving and spending wisely](https://engineergurukul.com/resources/kids/saving-and-spending-wisely/): Learn the difference between needs and wants, how to compare prices, and how to save a little each week for something special. - [Making a pocket-money budget](https://engineergurukul.com/resources/kids/pocket-money-budget/): Learn to plan pocket money with a simple budget: income, expenses and savings, using real sums and a clear plan. - [Study habits and time planning](https://engineergurukul.com/resources/kids/study-habits-and-time-planning/): Build good study habits with a timetable, priorities, short breaks and a quiet routine, and practise the time sums to plan your evening. - [Simple interest and how banks work](https://engineergurukul.com/resources/kids/simple-interest-and-banks/): Understand what a bank savings account is, what interest means, and use the formula SI = P × R × T ÷ 100 with worked examples. - [Washing hands and staying clean](https://engineergurukul.com/resources/kids/washing-hands-and-hygiene/): Learn how and when to wash hands with soap, and simple habits like brushing teeth and covering coughs that keep us healthy. - [A balanced diet](https://engineergurukul.com/resources/kids/balanced-diet/): Find out what nutrients our food gives us, the main food groups, and how to build a balanced plate every day. - [Road safety](https://engineergurukul.com/resources/kids/road-safety/): Learn the road rules that keep us safe: footpaths, zebra crossings, traffic lights, helmets, seat belts and the emergency number 112. - [First aid basics](https://engineergurukul.com/resources/kids/first-aid-basics/): Learn what first aid means, why we tell an adult first, and what to do for small scrapes, minor burns and nosebleeds. - [Sleep, stress and wellbeing](https://engineergurukul.com/resources/kids/sleep-stress-and-wellbeing/): Learn why sleep matters, how many hours school-age children usually need, and simple ways to handle stress and ask for help. - [Flowcharts: drawing a plan](https://engineergurukul.com/resources/kids/flowcharts-drawing-a-plan/): Draw a flowchart with start, step, decision and end shapes, follow the arrows, and plan any task before writing code. - [Variables: storing values](https://engineergurukul.com/resources/kids/variables-storing-values/): A variable is a labelled box in memory that holds a value; learn to set it, change it and trace it on paper step by step. - [Input, process, output](https://engineergurukul.com/resources/kids/input-process-output/): Every computer task takes input, processes it with steps, and gives output; learn to spot the three parts and write them in pseudocode. - [Files, folders and saving work](https://engineergurukul.com/resources/kids/files-folders-and-saving-work/): Learn what a file is, how folders organise files like a tree, what a file name and extension tell you, and why saving and backups matter. - [Searching the web and checking sources](https://engineergurukul.com/resources/kids/searching-the-web-and-checking-sources/): Choose good keywords, read search results wisely, and check who wrote a page, when, and whether other sources agree before you trust it. - [Functions: reusing steps](https://engineergurukul.com/resources/kids/functions-reusing-steps/): A function is a named block of steps you define once and call many times, with parameters going in and a return value coming out. - [Lists and arrays](https://engineergurukul.com/resources/kids/lists-and-arrays/): A list or array stores many values under one name; learn about index numbers starting at 0, and loop through a list to add or find things. - [Sorting and searching](https://engineergurukul.com/resources/kids/sorting-and-searching/): Trace bubble sort on paper, then compare linear search with binary search and see why a sorted list can be searched in far fewer steps. - [How the web works: URL, HTTP, browser and server](https://engineergurukul.com/resources/kids/how-the-web-works-url-http/): Read the parts of a URL, see how a browser sends an HTTP request to a server and gets a response, and learn what HTTPS and status codes mean. - [Passwords, encryption basics and two-factor](https://engineergurukul.com/resources/kids/passwords-encryption-and-two-factor/): Make strong passwords, see how a Caesar cipher scrambles a message and why a key matters, and learn how two-factor login adds a second lock. - [Subject-verb agreement](https://engineergurukul.com/resources/kids/subject-verb-agreement/): Learn how the verb changes to match a singular or plural subject, and fix common mistakes with tricky subjects. - [Articles: a, an and the](https://engineergurukul.com/resources/kids/articles-a-an-the/): Learn when to use a, an or the before a noun, why sounds matter more than letters, and when no article is needed. - [Prepositions of place and time](https://engineergurukul.com/resources/kids/prepositions-of-place-and-time/): Use in, on, at, under, between, before and after correctly to say where things are and when things happen. - [Conjunctions and joining sentences](https://engineergurukul.com/resources/kids/conjunctions-and-joining-sentences/): Use and, but, or, so, because, although and when to join short sentences into smooth, well-connected ones. - [Air around us](https://engineergurukul.com/resources/kids/air-around-us/): Find out what air is made of, why every living thing needs it, what makes air dirty and how we can keep it clean. - [Soil and what grows in it](https://engineergurukul.com/resources/kids/soil-and-what-grows-in-it/): Learn how soil forms from rock, what its layers are, the three main types of soil and which crops grow best in each. - [Animals and their homes](https://engineergurukul.com/resources/kids/animals-and-their-homes/): Match animals to the homes they build and the habitats they live in, and see how their bodies suit forests, deserts, cold lands and water. - [Reduce, reuse, recycle](https://engineergurukul.com/resources/kids/reduce-reuse-recycle/): Sort wet and dry waste into the right bins, learn the three Rs and discover how kitchen waste can turn into compost for plants. - [Weather and the seasons of India](https://engineergurukul.com/resources/kids/weather-and-seasons-of-india/): Tell weather from climate, learn the four main seasons of India with their months, and see how the monsoon brings rain to the country. - [Rivers and mountains of India](https://engineergurukul.com/resources/kids/rivers-and-mountains-of-india/): Travel across a map of India to meet the Himalayas, the Ghats and the Aravallis, and follow the great rivers from their source to the sea. - [The map of India and its neighbours](https://engineergurukul.com/resources/kids/india-and-its-neighbours/): Read a map of India using directions, find the seas on three sides, and learn the names and capitals of the countries next door. - [Our community helpers](https://engineergurukul.com/resources/kids/our-community-helpers/): Meet the people who keep a neighbourhood running, from farmers and doctors to postal workers and sanitation workers, and the tools they use. - [Means of transport and communication](https://engineergurukul.com/resources/kids/transport-and-communication/): Sort transport into land, water and air, learn how Indian railways and roads connect the country, and see how messages travel from letters to the internet. - [Republic Day, Independence Day and our national days](https://engineergurukul.com/resources/kids/republic-day-and-independence-day/): Learn why 15 August and 26 January are special, what happened on each date, how they are celebrated, and the rules for respecting the flag. - [Hindi adjectives (visheshan) (विशेषण)](https://engineergurukul.com/resources/kids/hindi-visheshan-adjectives/): विशेषण संज्ञा या सर्वनाम की विशेषता बताते हैं: गुणवाचक, संख्यावाचक, परिमाणवाचक और सार्वनामिक विशेषण पहचानना सीखो। - [Hindi pronouns (sarvanam) (सर्वनाम)](https://engineergurukul.com/resources/kids/hindi-sarvanam-pronouns/): संज्ञा की जगह आने वाले शब्द सर्वनाम हैं: मैं, तुम, वह, कोई, कौन और जो जैसे सर्वनामों के छह भेद सीखो। - [Hindi synonyms (paryayvachi) (पर्यायवाची शब्द)](https://engineergurukul.com/resources/kids/hindi-paryayvachi-shabd/): एक ही अर्थ वाले अलग-अलग शब्द पर्यायवाची कहलाते हैं: सूर्य, जल, घर, पेड़ और फूल जैसे शब्दों के पर्यायवाची सीखो। - [One word for many (anek shabdon ke liye ek shabd) (अनेक शब्दों के लिए एक शब्द)](https://engineergurukul.com/resources/kids/hindi-anek-shabd-ek-shabd/): लंबे वाक्यांश की जगह एक सटीक शब्द लगाना सीखो, जैसे "जहाँ पुस्तकें रखी जाती हैं" के लिए पुस्तकालय। - [Hindi sentences and punctuation (vakya aur viram chinh) (वाक्य और विराम चिह्न)](https://engineergurukul.com/resources/kids/hindi-vakya-aur-viram-chinh/): सही क्रम में शब्द जोड़कर वाक्य बनाना और पूर्ण विराम, प्रश्नवाचक, विस्मयादिबोधक तथा अल्प विराम लगाना सीखो। - [Hindi sandhi basics (संधि)](https://engineergurukul.com/resources/kids/hindi-sandhi-basics/): दो वर्णों के मेल से होने वाले बदलाव को संधि कहते हैं: दीर्घ, गुण, वृद्धि, यण और अयादि स्वर संधि उदाहरणों से सीखो। - [Hindi compound words (samas) (समास)](https://engineergurukul.com/resources/kids/hindi-samas-basics/): दो या अधिक शब्दों को जोड़कर नया छोटा शब्द बनाना समास है: तत्पुरुष, कर्मधारय, द्विगु, द्वंद्व, बहुव्रीहि और अव्ययीभाव सीखो। - [Hindi prefixes and suffixes (upsarg aur pratyay) (उपसर्ग और प्रत्यय)](https://engineergurukul.com/resources/kids/hindi-upsarg-aur-pratyay/): शब्द के आगे लगने वाले उपसर्ग (अ, सु, प्र) और पीछे लगने वाले प्रत्यय (ता, वान, ईय) से नए शब्द बनाना सीखो। - [Hindi cases (karak) (कारक)](https://engineergurukul.com/resources/kids/hindi-karak-cases/): वाक्य में संज्ञा का क्रिया से संबंध बताने वाले आठ कारक और उनकी विभक्तियाँ (ने, को, से, के लिए, का, में) सीखो। - [Hindi letter writing (patra lekhan) (पत्र लेखन)](https://engineergurukul.com/resources/kids/hindi-patra-lekhan/): औपचारिक और अनौपचारिक पत्र का ढाँचा सीखो: पता, दिनांक, संबोधन, विषय, मुख्य भाग, समापन और हस्ताक्षर। - [Rational and irrational numbers](https://engineergurukul.com/resources/kids/rational-and-irrational-numbers/): Tell rational numbers from irrational ones, turn recurring decimals into fractions and find where √2 sits on the number line. - [Polynomials and factorisation](https://engineergurukul.com/resources/kids/polynomials-and-factorisation/): Learn degree and zeroes of a polynomial, use the identities for squares, and factorise quadratics by splitting the middle term. - [Linear equations in two variables](https://engineergurukul.com/resources/kids/linear-equations-in-two-variables/): See why ax + by = c draws a straight line, and solve a pair of such equations by substitution, by elimination and by graphing. - [Quadratic equations](https://engineergurukul.com/resources/kids/quadratic-equations/): Solve ax² + bx + c = 0 by factorising and by the quadratic formula, and use the discriminant to predict how many real roots there are. - [Arithmetic progressions](https://engineergurukul.com/resources/kids/arithmetic-progressions/): Recognise a sequence with a constant difference, find any term with a + (n − 1)d and add up n terms with the sum formula. - [Phonics: the sounds letters make](https://engineergurukul.com/resources/kids/phonics-sounds-of-letters/): Learn the sound each letter makes and blend sounds together to read short words like cat, pen and sun. - [Rhyming words](https://engineergurukul.com/resources/kids/rhyming-words-fun/): Find words that sound the same at the end, like cat and hat, and make your own tiny rhymes. - [Capital letters: when to use them](https://engineergurukul.com/resources/kids/capital-letters-when-to-use/): Learn the three big rules for capital letters: starting a sentence, names of people and places, and the word I. - [Opposites: word pairs](https://engineergurukul.com/resources/kids/opposites-word-pairs/): Learn opposite words such as hot and cold, big and small, up and down, and use them in sentences. - [Describing people, places and things](https://engineergurukul.com/resources/kids/describing-people-places-and-things/): Use describing words for colour, size, shape and feel so that your reader can see and touch what you write about. - [Building sentences step by step](https://engineergurukul.com/resources/kids/building-sentences-step-by-step/): Build strong sentences from who, what they do, and extra details like where, when and how. - [Draw animals and vehicles with shapes](https://engineergurukul.com/resources/kids/shape-animals-and-vehicles/): Build a cat, a bus and a boat from circles, rectangles and triangles, one easy step at a time. - [The colour wheel: mixing colours](https://engineergurukul.com/resources/kids/primary-and-secondary-colour-wheel/): Learn primary and secondary colours, mix new colours with paint or crayons, and make your own colour wheel. - [Paper folding: boat and fan](https://engineergurukul.com/resources/kids/paper-folding-fun-origami/): Learn neat folds, then make a paper boat and a pleated fan using only a sheet of paper. - [Nature printing with leaves](https://engineergurukul.com/resources/kids/nature-printing-leaf-prints/): Press leaves and flowers dipped in paint on paper to make pretty prints, and see the veins of every leaf. - [Making repeating patterns](https://engineergurukul.com/resources/kids/pattern-making-repeating-designs/): Create border and block patterns by repeating shapes and colours, and find the part that repeats. - [My day: a simple timetable](https://engineergurukul.com/resources/kids/my-day-timetable/): Plan your day with a picture timetable: wake up, school, play, homework, dinner and sleep. - [Saving coins in a piggy bank](https://engineergurukul.com/resources/kids/saving-coins-piggy-bank/): Learn why saving coins is a good habit, how to count what you save, and how to wait for something you want. - [Sharing and being kind](https://engineergurukul.com/resources/kids/sharing-and-being-kind/): Learn easy ways to share, take turns and be kind to friends, family and animals. - [Keeping my room tidy](https://engineergurukul.com/resources/kids/keeping-my-room-tidy/): Learn to put things back in their place, make your bed and keep your space neat in five easy steps. - [Telling time: minutes and a.m. and p.m.](https://engineergurukul.com/resources/kids/telling-time-minutes-and-am-pm/): Read the minute hand, say times like quarter past and half past, and know what a.m. and p.m. mean. - [Helping at home](https://engineergurukul.com/resources/kids/helping-at-home/): Find safe jobs you can do at home, learn why helping matters and how to do each job with care. - [Washing hands: the six steps](https://engineergurukul.com/resources/kids/six-steps-of-handwashing/): Learn the six steps for washing hands with soap and water so that germs go down the drain. - [Brushing teeth properly](https://engineergurukul.com/resources/kids/brushing-teeth-properly/): Learn how and when to brush, how much toothpaste to use and which foods are friends of our teeth. - [My healthy plate](https://engineergurukul.com/resources/kids/my-healthy-plate/): Learn how to fill a plate with grains, vegetables, fruit, protein and milk foods so that you grow strong. - [Sleep and play: finding the balance](https://engineergurukul.com/resources/kids/sleep-and-play-balance/): See why children need good sleep and daily play, and how to balance screens, study, play and rest. - [Crossing the road safely](https://engineergurukul.com/resources/kids/crossing-the-road-safely/): Learn to stop, look and listen, use zebra crossings and walk safely near roads. - [Safe and unsafe touch](https://engineergurukul.com/resources/kids/safe-and-unsafe-touch/): A gentle lesson on safe and unsafe touch, our body belongs to us, and how to say no and tell a trusted adult. - [Sunscreen and drinking water](https://engineergurukul.com/resources/kids/sunscreen-and-drinking-water/): Learn how to protect skin from strong sun and why we need to drink enough water, especially in hot weather. - [Multiplication tables 1 to 20](https://engineergurukul.com/resources/kids/reference/multiplication-tables/): Every table from 1 to 20, each up to 10 times, on one printable sheet. - [Squares and cubes 1 to 30](https://engineergurukul.com/resources/kids/reference/squares-and-cubes/): Squares and cubes of the numbers 1 to 30, with perfect squares to remember. - [Maths formulas: classes 6 to 8](https://engineergurukul.com/resources/kids/reference/maths-formulas-class-6-8/): Perimeter, area, volume, percentages, interest, algebra identities, exponents and angles for middle school. - [Maths formulas: classes 9 and 10](https://engineergurukul.com/resources/kids/reference/maths-formulas-class-9-10/): Identities, quadratics, progressions, coordinate geometry, trigonometry, mensuration, statistics and probability. - [Units and conversions](https://engineergurukul.com/resources/kids/reference/units-and-conversions/): Length, mass, capacity, time, area, temperature, speed, Indian number names, data sizes and SI units. - [Common science facts: classes 6 to 8](https://engineergurukul.com/resources/kids/reference/science-facts-class-6-8/): Matter, separation methods, nutrition and deficiency diseases, acids and bases, light, sound, the solar system and the air we breathe. - [Science formulas: classes 9 and 10](https://engineergurukul.com/resources/kids/reference/science-formulas-class-9-10/): Motion, force, work, energy, gravitation, light, electricity, waves and chemistry formulas with their units. - [Periodic table: first 30 elements](https://engineergurukul.com/resources/kids/reference/periodic-table-first-30/): Symbol, atomic number, name and a common use for hydrogen to zinc. - [Human body quick facts](https://engineergurukul.com/resources/kids/reference/human-body-facts/): Bones, muscles, teeth, heart, blood, brain, digestion, the senses and the organ systems in a quick-reference list. - [Indian states and capitals](https://engineergurukul.com/resources/kids/reference/indian-states-and-capitals/): The 28 states and 8 union territories of India with their capitals. - [National symbols of India](https://engineergurukul.com/resources/kids/reference/national-symbols/): The flag, emblem, anthem, song, animal, bird, flower, fruit, tree, river and national days of India. - [Hindi varnamala with matras](https://engineergurukul.com/resources/kids/reference/hindi-varnamala/): Swar, vyanjan, matras and the barakhadi, with number words and days of the week. - [English grammar quick reference](https://engineergurukul.com/resources/kids/reference/english-grammar/): Parts of speech, articles, all twelve tenses, common irregular verbs and punctuation marks. - [Keyboard shortcuts for students](https://engineergurukul.com/resources/kids/reference/keyboard-shortcuts/): Common shortcuts for Windows, writing documents, browsers, spreadsheets and presentations. - [Computer parts glossary](https://engineergurukul.com/resources/kids/reference/computer-parts-glossary/): Inside and outside parts of a computer, grouped as input, output and storage, with short plain meanings. - [Project report format](https://engineergurukul.com/resources/kids/reference/project-report-format/): A standard order of pages for a school project file, with formatting tips and what to write in each part. - [Science fair checklist](https://engineergurukul.com/resources/kids/reference/science-fair-checklist/): A printable tick-box plan from choosing a question to presenting your project on the day. ## Parents and teachers - [Hub](https://engineergurukul.com/resources/parents/) - [How to help with homework without doing it for your child](https://engineergurukul.com/resources/parents/help-with-homework-without-doing-it/): Questions to ask, how long to sit with a child and what to do when you do not know the answer, so the thinking stays with your child. - [Building a study routine that your child will actually keep](https://engineergurukul.com/resources/parents/building-a-study-routine/): A realistic daily and weekly routine for school children, with a sample timetable by age and tips for power cuts, tuition and festival weeks. - [Reading with your child: twenty minutes that change everything](https://engineergurukul.com/resources/parents/reading-with-your-child/): How to read aloud, share the reading and talk about books with children of different ages, with or without a home library. - [Screen time that works: rules a family can actually follow](https://engineergurukul.com/resources/parents/screen-time-that-works/): How to agree fair screen rules, what counts as good screen use, and how to handle phones, games and online classes without constant fights. - [Choosing a science project with your child](https://engineergurukul.com/resources/parents/choosing-a-science-project-with-your-child/): How to pick a project your child can understand, finish and explain, using the free project finder and detailed guides on this site. - [Keeping a home science project safe](https://engineergurukul.com/resources/parents/safety-for-a-home-science-project/): Simple safety rules for cutting, heat, electricity, chemicals and plants when children build projects at home, and when an adult must take over. - [Preparing for a school science exhibition](https://engineergurukul.com/resources/parents/preparing-for-a-science-exhibition/): A week-by-week plan, a talk outline and a checklist for the exhibition day, so your child presents with confidence instead of nerves. - [Exam stress and sleep: how parents can help](https://engineergurukul.com/resources/parents/exam-stress-and-sleep/): Everyday ways to keep exam time calm: sleep, food, revision plans, home atmosphere and signs that a child needs more support. - [Talking about marks: how to discuss results without damaging confidence](https://engineergurukul.com/resources/parents/talking-about-marks/): What to say when the report card comes home, how to read marks as information and how to plan the next step together. - [Learning difficulties: when to ask for help](https://engineergurukul.com/resources/parents/learning-difficulties-when-to-ask-for-help/): General signs that a child may need extra support with reading, writing, maths or attention, and how to start a conversation with the school and a professional. - [Online safety for parents: OTPs, scams, games and social media](https://engineergurukul.com/resources/parents/online-safety-for-parents/): Plain rules about OTPs and payment scams, online games, social media age limits and what to do if something goes wrong, including the 1930 cyber crime helpline. - [Choosing a computer course for a teenager](https://engineergurukul.com/resources/parents/choosing-a-computer-course-for-a-teenager/): How to match a computer course to a teenager's interest and school load, what to ask a centre before paying and how to use the free learning paths. - [Careers after Class 10 and Class 12: a calm guide for parents](https://engineergurukul.com/resources/parents/careers-after-class-10-and-12/): The main routes after Class 10 and Class 12, how to help a child decide without pressure, and where to find the full career guides. - [Encouraging girls in science and coding](https://engineergurukul.com/resources/parents/encouraging-girls-in-science-and-coding/): Everyday ways families and teachers can help girls keep their interest in science, maths and coding, from toys and chores to role models and confidence. - [Learning English at home, even if English is not spoken there](https://engineergurukul.com/resources/parents/learning-english-at-home/): Simple daily habits that build listening, speaking, reading and writing in English, without needing the parents to be fluent. - [Hindi reading at home: from matras to stories](https://engineergurukul.com/resources/parents/hindi-reading-at-home/): How to help a child read Hindi with confidence: swar and matras, short words, daily reading, and games for the Devanagari script. - [Maths at the kitchen table: everyday practice that sticks](https://engineergurukul.com/resources/parents/maths-at-the-kitchen-table/): Games and daily jobs, such as cooking, shopping and travel, that make number sense, tables, fractions and percentages real for children. - [Raising a curious child: questions and experiments at home](https://engineergurukul.com/resources/parents/raising-a-curious-child/): How to answer endless why questions, turn them into small safe experiments and keep a child's curiosity alive through school. - [Using this site's free resources as a family: a tour](https://engineergurukul.com/resources/parents/using-this-sites-free-resources-as-a-family/): A tour of the free kids lessons, practice sheets, handbooks, ebooks, project guides, project finder and tools, with a simple weekly plan. - [Running a project class with the free project guides](https://engineergurukul.com/resources/parents/running-a-project-class-with-the-free-guides/): A plan for turning the free detailed guides into a four-period project unit: grouping, materials, safety, observation tables, viva and display. - [Classroom activity packs by class](https://engineergurukul.com/resources/parents/classroom-activity-packs-by-class/): Six ready-to-use packs for classes 1 to 12, each listing six free projects or lessons from this site with objectives, materials, time and assessment ideas. - [Making a science club in your school](https://engineergurukul.com/resources/parents/making-a-science-club/): How to start and run a school science club on a small budget: members, a term plan, roles, activities, safety, and showing the work. - [Assessing projects fairly: a rubric for science and model work](https://engineergurukul.com/resources/parents/assessing-projects-fairly/): A simple four-level rubric for school projects, how to score process as well as product, and ways to stay fair when families spend very different amounts. - [Using the student portal practice tests in class](https://engineergurukul.com/resources/parents/using-the-student-portal-practice-tests-in-class/): How computer teachers and centre instructors can use timed practice tests and the typing test for revision, diagnosis and feedback, without turning them into pressure. - [Teaching robotics with low-cost kits](https://engineergurukul.com/resources/parents/teaching-robotics-with-low-cost-kits/): A practical path from cardboard and cells to Arduino, with lesson plans, budget tips, group roles, safety and assessment for school robotics. - [Inclusive classrooms: teaching every child in a mixed class](https://engineergurukul.com/resources/parents/inclusive-classrooms/): Practical, low-cost ways to teach a class where students differ in language, pace, background, ability and confidence, with simple adjustments that help everyone. ## Free ebooks - [Computer Fundamentals Study Book](https://engineergurukul.com/resources/ebooks/computer-fundamentals-study-book/): Learn how a computer works, from its parts and devices to memory units, number systems, software, operating systems and file management. - [Windows, Internet and Email Study Book](https://engineergurukul.com/resources/ebooks/windows-internet-study-book/): Use Windows confidently, manage files and folders, browse and search the web, write proper emails, stay safe from online and UPI fraud, and keep files in the cloud. - [MS Word Study Book](https://engineergurukul.com/resources/ebooks/ms-word-study-book/): Create, edit, format and print professional documents in Microsoft Word, from simple letters and tables to long reports with a table of contents and mail-merged letters. - [MS Excel Study Book](https://engineergurukul.com/resources/ebooks/ms-excel-study-book/): Work with cells, ranges and formulas in Microsoft Excel, use functions such as SUM, IF, VLOOKUP and XLOOKUP, and sort, filter, chart and print your data. - [MS PowerPoint Study Book](https://engineergurukul.com/resources/ebooks/ms-powerpoint-study-book/): Build clear, attractive presentations in Microsoft PowerPoint with layouts, themes, pictures, charts, transitions and animations, then deliver them confidently as a slide show. - [Typing Study Book](https://engineergurukul.com/resources/ebooks/typing-study-book/): Learn touch typing the right way: posture, the home row, which finger presses which key, accuracy before speed, measuring WPM, a daily practice plan and the basics of Hindi typing. - [Tally with GST Study Book](https://engineergurukul.com/resources/ebooks/tally-gst-study-book/): Learn the golden rules of accounting, then keep books in TallyPrime: create a company, ledgers and stock items, enter vouchers with their function keys, record GST invoices and read the main reports. - [C Programming Study Book](https://engineergurukul.com/resources/ebooks/c-programming-study-book/): Learn to write, compile and run C programs, from data types, operators and decisions to loops, arrays, strings, functions, pointers, structures and simple file handling. - [C++ Programming Study Book](https://engineergurukul.com/resources/ebooks/cpp-programming-study-book/): Move from C to object-oriented C++17: classes, constructors, inheritance, virtual functions, overloading, templates, the STL containers vector, string and map, and exception handling. - [Java Study Book](https://engineergurukul.com/resources/ebooks/java-study-book/): Learn Java 17 from the ground up: how the JDK, JRE and JVM fit together, data types, control flow, arrays, strings, classes, inheritance, interfaces, packages, exceptions and the ArrayList and HashMap collections. - [HTML and CSS Study Book](https://engineergurukul.com/resources/ebooks/html-css-study-book/): Build web pages with HTML5 and style them with CSS3, from document structure, text, tables and forms to selectors, the box model, Flexbox, Grid and responsive design. - [Databases and SQL Study Book](https://engineergurukul.com/resources/ebooks/databases-sql-study-book/): Understand how a database management system stores data in related tables, and write MySQL 8 queries to create tables, add, read, change and summarise data, join tables and design them well. - [Cyber Security Basics Study Book](https://engineergurukul.com/resources/ebooks/cyber-security-study-book/): Protect your accounts, money and data: strong passwords, two-factor authentication, spotting phishing and UPI fraud, malware, safe browsing, backups and social media privacy. - [Computer Networking Study Book](https://engineergurukul.com/resources/ebooks/networking-study-book/): Learn how computers connect and talk to each other, from network types, topologies, devices, cables and Wi-Fi to IPv4 addressing, DNS, DHCP, the OSI and TCP/IP models, common ports and basic troubleshooting. - [Computer Hardware and Maintenance Study Book](https://engineergurukul.com/resources/ebooks/hardware-maintenance-study-book/): Know every part inside a PC, assemble one safely, set up BIOS/UEFI, install Windows and drivers, and diagnose and prevent common hardware faults. - [Mobile Repairing Basics Study Book](https://engineergurukul.com/resources/ebooks/mobile-repair-study-book/): Learn the parts inside a smartphone, the tools and safety rules of a repair bench, lithium-ion battery safety, how to diagnose charging, display and software faults, and how to protect customer data. - [DTP and CorelDRAW Study Book](https://engineergurukul.com/resources/ebooks/dtp-coreldraw-study-book/): Learn desktop publishing from the ground up: page layout, typography, RGB and CMYK colour, print resolution, vector and raster graphics, the core CorelDRAW tools, and a visiting card and poster workflow ending in a print - [English Grammar and Communication Study Book](https://engineergurukul.com/resources/ebooks/english-grammar-study-book/): Build correct, confident English: parts of speech, tenses, articles, prepositions, subject-verb agreement, voice and reported speech, the common errors Hindi speakers make, and phrases for interviews and the office. - [Spoken English Study Book](https://engineergurukul.com/resources/ebooks/spoken-english-study-book/): Speak English with confidence in daily life and at work: greetings and introductions, everyday conversations, clear pronunciation, polite questions, office and telephone English, job interviews, group discussions and pre - [Shorthand Study Book](https://engineergurukul.com/resources/ebooks/shorthand-study-book/): Learn what shorthand and stenography are, how Pitman-style shorthand writes by sound with strokes, vowel signs, short forms and phrases, and how graded dictation, careful transcription and daily typing practice build rea - [Robotics and Electronics Basics Study Book](https://engineergurukul.com/resources/ebooks/robotics-electronics-study-book/): Learn how electricity, circuits and electronic parts work, then use motors, sensors and batteries safely to understand how simple robots such as line followers and obstacle avoiders think and move. - [Arduino and Coding for Robots Study Book](https://engineergurukul.com/resources/ebooks/arduino-coding-study-book/): Program an Arduino Uno from your first blinking LED to a working robot: pins, the Arduino IDE, inputs and outputs, the Serial Monitor, variables, decisions, loops and functions, sensors, motor drivers, servos and debuggi - [Beauty and Wellness Basics Study Book](https://engineergurukul.com/resources/ebooks/beauty-care-study-book/): The everyday foundations of salon work: hygiene and sterilising tools, skin and hair care basics, manicure and pedicure, makeup and colour matching, threading and waxing, client consultation with the patch test, salon sa - [Dress Design and Tailoring Basics Study Book](https://engineergurukul.com/resources/ebooks/dress-design-study-book/): From tailoring tools and fabrics to measurements, pattern drafting, cutting layouts, seams, hems and the sewing machine, then on to the elements and principles of design, fashion illustration and building a simple portfo - [Keyboard Shortcuts Handbook](https://engineergurukul.com/resources/ebooks/keyboard-shortcuts-handbook/): Learn the key combinations that save time every day in Windows, File Explorer, Word, Excel, PowerPoint and the Chrome or Edge browser. Each chapter explains what the keys do, with small practice tasks, and the book ends - [Excel Formulas Workbook](https://engineergurukul.com/resources/ebooks/excel-formulas-workbook/): Sixty Excel formulas and functions explained one at a time, each with a small data table and its result, from simple sums to IF, SUMIFS, text and date functions, VLOOKUP and XLOOKUP. Three complete projects (a marksheet, - [Letters, Applications and Resumes in MS Word](https://engineergurukul.com/resources/ebooks/word-letters-resumes/): Learn to set up the page, choose fonts and spacing, and write formal letters, leave and complaint applications, cover letters and resumes in Microsoft Word, in the format used in India. Six complete sample documents, plu - [Presentation Skills with PowerPoint](https://engineergurukul.com/resources/ebooks/powerpoint-presentation-skills/): Learn to plan a talk around your audience and one clear message, design clean slides with good contrast, pictures, charts and SmartArt, and use animations, speaker notes, Presenter View and rehearsal timings wisely. Prac - [Email, Online Forms and Everyday Digital Tasks](https://engineergurukul.com/resources/ebooks/email-and-online-forms/): Learn to set up a safe email account, write polite emails, and send documents as attachments. You will also scan papers, make PDFs, resize photos and signatures, fill online forms without mistakes, use OTPs safely, and k - [Safe UPI and Digital Payments](https://engineergurukul.com/resources/ebooks/safe-digital-payments/): Learn how UPI, QR codes, cards and net banking work, and how to pay and receive money safely. You will learn the one rule that stops most frauds, recognise the common tricks fraudsters use, and know exactly what to do in - [Hindi Typing on a Computer](https://engineergurukul.com/resources/ebooks/hindi-typing-guide/): Learn to type Hindi on a Windows computer with the Inscript keyboard and Unicode fonts. Step by step, you will type vowels, matras, half letters, conjuncts such as क्ष and त्र, the nukta and numerals, then build speed an - [Typing Speed Practice Workbook](https://engineergurukul.com/resources/ebooks/typing-speed-workbook/): A practical workbook for anyone preparing for a typing test or an office job. Learn correct posture and the finger chart, work out your speed and accuracy, then practise with 20 graded drills, 15 passages of rising lengt - [Files, Folders, Backups and Cloud Storage](https://engineergurukul.com/resources/ebooks/file-management-cloud/): A practical guide for students and office staff who handle many files on a Windows computer. Learn to name, sort, find, copy, zip and share files, use pen drives safely, keep backups with the 3-2-1 rule and use cloud sto - [Basics of Accounting](https://engineergurukul.com/resources/ebooks/accounting-fundamentals/): A gentle first course in accounting for commerce students and anyone about to learn Tally. Follow one small shop through a month of twenty transactions, from journal entries and ledger posting to the cash book, the trial - [Tally Practice Workbook](https://engineergurukul.com/resources/ebooks/tally-practice-workbook/): A hands-on workbook for TallyPrime. Set up a practice company for a stationery shop, create its ledgers and stock items, then enter a full month of forty transactions, each with the right voucher type and ledgers. Check - [GST Basics for Students and Small Shops](https://engineergurukul.com/resources/ebooks/gst-basics-small-business/): A plain-English guide to Goods and Services Tax for commerce students, shop owners and accounts assistants. Learn how GST moves along a chain of sellers, when to charge CGST and SGST or IGST, how to read a GSTIN and a ta - [Business Maths for Accounts](https://engineergurukul.com/resources/ebooks/business-maths-for-accounts/): The everyday maths of shops and offices, explained one idea at a time with worked examples in rupees. Learn percentages, profit and loss, discounts, simple and compound interest, EMIs, ratios, averages, tax-inclusive pri - [Excel for Accounts and Office Records](https://engineergurukul.com/resources/ebooks/excel-for-accounts/): A practical guide to keeping a small business's records in Microsoft Excel. You will build a cash book with a running balance, a stock register that warns you when to reorder, an invoice template, a customer ledger and m - [Python for Beginners](https://engineergurukul.com/resources/ebooks/python-for-beginners/): A gentle first course in programming with Python 3. You will install Python and IDLE, then learn variables, numbers, strings, decisions, loops, lists, dictionaries, functions, modules, files and error handling by writing - [JavaScript Basics for Web Pages](https://engineergurukul.com/resources/ebooks/javascript-basics/): A friendly first course in JavaScript for students who know some HTML and CSS. Learn variables, loops, functions, arrays and objects, then change a page, react to clicks and build three projects: a form that checks itsel - [C Practice Programs](https://engineergurukul.com/resources/ebooks/c-practice-programs/): Practise C with thirty complete programs, from your first printf to loops, patterns, arrays, strings, recursion, pointers, structures and files. Each comes with sample output and a plain explanation, so you can write, ru - [Object-Oriented Programming in C++](https://engineergurukul.com/resources/ebooks/cpp-oop-practice/): Move from C to C++ and learn object-oriented programming, from classes and constructors to inheritance, virtual functions, templates, exceptions, the STL and files. Nineteen practice programs, such as a bank account, sha - [Java Practice Programs](https://engineergurukul.com/resources/ebooks/java-practice-programs/): Learn core Java by running twenty-four complete programs, from your first class to loops, arrays, strings, classes, inheritance, interfaces, exceptions, collections and files. Each program shows its output and explains t - [Build Five Web Pages with HTML and CSS](https://engineergurukul.com/resources/ebooks/html-css-projects/): Build a small website of five real pages, one project at a time: a profile, a school page, a shop, an enquiry form and a photo gallery. Along the way you learn HTML structure, the box model, flexbox, grid, media queries, - [SQL Practice Workbook](https://engineergurukul.com/resources/ebooks/sql-practice-workbook/): Build a small school database and learn SQL by asking it real questions. You will write queries that filter, sort, count and join tables, change data safely and design tables well, then test yourself with 50 practice que - [Flowcharts, Algorithms and Logic Building](https://engineergurukul.com/resources/ebooks/flowcharts-and-algorithms/): Learn to plan a program before you type it. You will write clear steps, pseudocode and flowcharts, check them with dry runs and trace tables, and work through 25 solved problems and a set of logic puzzles that build the - [Data Structures Made Simple](https://engineergurukul.com/resources/ebooks/data-structures-basics/): Understand how programs organise data, from arrays and strings to stacks, queues, linked lists, trees, heaps, graphs and hash tables. Every idea starts with an everyday example, working C code shows how it is built, and - [Photo Editing Basics with Photoshop](https://engineergurukul.com/resources/ebooks/photoshop-basics/): Learn to find your way around Adobe Photoshop and edit photos with confidence. You will crop and resize, fix light and colour, remove spots and backgrounds, add text and effects, make a passport-size photo sheet, and sav - [CorelDRAW Projects](https://engineergurukul.com/resources/ebooks/coreldraw-projects/): Learn the CorelDRAW tools you will use every day, then put them to work in five real projects: a visiting card, a logo, a letterhead, a poster and a flex banner. You will learn to set up the page, add bleed, convert text - [Design Principles](https://engineergurukul.com/resources/ebooks/design-principles/): Learn the simple rules that make a poster, notice, invitation or social media post clear and good-looking: contrast, alignment, repetition, proximity, hierarchy, white space, colour and type. Every idea comes with Indian - [Getting Files Ready for the Printer](https://engineergurukul.com/resources/ebooks/print-design-guide/): Learn what printers need from you so that your cards, leaflets, books and banners come out right the first time. The book explains paper sizes, CMYK colour, resolution, bleed, fonts, black and spot colours, proofing, imp - [Desktop Publishing Practical](https://engineergurukul.com/resources/ebooks/desktop-publishing-practical/): Learn how page layout programs work, from master pages, columns and text frames to styles, tables and text wrap. Then build four real projects: a school newsletter, an admission form, a certificate and a small booklet wi - [Assembling a Desktop Computer](https://engineergurukul.com/resources/ebooks/computer-assembly-guide/): Learn what each part of a desktop computer does, how to pick parts that fit together, and how to assemble them safely, one step at a time. The book then takes you through the first start, the BIOS settings, tidy cables a - [Installing Windows and Fixing Common Problems](https://engineergurukul.com/resources/ebooks/windows-installation-troubleshooting/): Learn to back up a computer, make an official Windows USB installer and install Windows cleanly with the right drivers and updates. The book then shows how to speed up a slow PC, repair a computer that will not start, un - [Printers and Scanners](https://engineergurukul.com/resources/ebooks/printer-troubleshooting/): Learn how the common kinds of printer work, then install one on Windows, connect it by USB, cable or Wi-Fi and share it with the whole office. You will clear stuck print jobs and paper jams, fix faded or streaky prints, - [Networking Practical](https://engineergurukul.com/resources/ebooks/lan-cabling-practical/): A hands-on guide to small office and home networks. You will make and test your own LAN cables, understand IP addresses, subnet masks, gateways and DNS, set static and automatic addresses in Windows, use ipconfig, ping a - [Laptop Care and Basic Repairs](https://engineergurukul.com/resources/ebooks/laptop-care-repair/): Learn how to look after a laptop's battery, charger, keyboard, screen and cooling, and how to fix common problems such as heat, slow speed and Wi-Fi trouble. You will also learn to upgrade RAM and storage safely, clone a - [Using a Digital Multimeter](https://engineergurukul.com/resources/ebooks/multimeter-guide/): Learn every part of a digital multimeter and use it safely on battery circuits. You will measure DC voltage, resistance and current, check continuity, test diodes, LEDs, switches, fuses, wires, batteries and transistors, - [Soldering for Beginners](https://engineergurukul.com/resources/ebooks/soldering-guide/): Learn to solder safely and well. You will set up a bench, tin the iron's tip, solder parts onto a circuit board, join wires with heat-shrink, tell good joints from bad ones, remove parts with wick and pump, try surface-m - [Mobile Phone Repair: Tools and Fault Finding](https://engineergurukul.com/resources/ebooks/mobile-repair-tools/): Set up a safe, static-free workbench and learn what every tool on it does, from screwdrivers and opening picks to the hot air station, DC power supply, multimeter and microscope. Then open a phone safely, handle batterie - [Electronic Components Handbook](https://engineergurukul.com/resources/ebooks/electronic-components-handbook/): Learn what the common parts in an electronics kit do, how to read their markings and how to connect each one safely. You will use Ohm's law to choose resistors, find the legs of LEDs, diodes and transistors, power a proj - [Breadboard Circuits](https://engineergurukul.com/resources/ebooks/breadboard-circuits/): Learn how a breadboard is joined inside, how to read a circuit diagram and how to turn it into a working circuit. Then build fifteen safe experiments on batteries of 9 V or less, from a first LED to a night lamp, a water - [Arduino Starter Projects](https://engineergurukul.com/resources/ebooks/arduino-starter-projects/): Get to know the Arduino Uno, install the free Arduino IDE and upload your first program. Then build ten projects, from a traffic light and a light-sensing lamp to a melody player, a distance meter, a thermometer, a servo - [Sensors for School Projects](https://engineergurukul.com/resources/ebooks/sensors-guide/): Understand what sensors are, the difference between analog and digital outputs, and how to connect each common sensor to an Arduino Uno. For the LDR, IR, PIR, ultrasonic, temperature, humidity, soil, rain, gas, sound, fl - [Motors, Gears and Motor Drivers](https://engineergurukul.com/resources/ebooks/motors-and-drivers/): Learn how DC motors, servo motors and stepper motors work, how gears trade speed for strength, and how to control motors from an Arduino with L293D and L298N drivers. By the end you can wire, code and power a small robot - [Build a Line Follower Robot](https://engineergurukul.com/resources/ebooks/line-follower-robot/): Build a robot that follows a black line on its own, from an empty chassis to a tuned, working machine. You will mount and calibrate two IR sensors, wire an L298N driver, understand every line of the Arduino code, test it - [Build an Obstacle-Avoiding Robot](https://engineergurukul.com/resources/ebooks/obstacle-avoiding-robot/): Build a robot that drives on its own, spots walls and furniture with an ultrasonic sensor, looks left and right on a servo, and turns towards the clearer path. You will learn the speed-of-sound maths, wire and code the w - [Build a Bluetooth-Controlled Car](https://engineergurukul.com/resources/ebooks/bluetooth-car/): Build a robot car and drive it from an Android phone over Bluetooth. You will learn how Bluetooth serial works, wire an HC-05 module safely with a voltage divider, pair a phone, design command characters, write the compl - [IoT Basics with NodeMCU](https://engineergurukul.com/resources/ebooks/iot-esp8266-basics/): Learn what the Internet of Things is and build real Wi-Fi projects with a NodeMCU ESP8266 board. You will set up the Arduino IDE, blink an LED, switch it from your phone through a tiny web server, show DHT11 temperature - [Robotics for Young Children](https://engineergurukul.com/resources/ebooks/robotics-for-young-kids/): Simple, screen-free ways to introduce children aged 4 to 8 to robots and coding. Parents and teachers will find games, crafts and safe adult-led circuit activities, tips on screen time and on talking about mistakes, and - [Coding for Kids with Scratch](https://engineergurukul.com/resources/ebooks/scratch-coding-for-kids/): A friendly first coding book for children of class 3 to 8 and their teachers. You will learn the Scratch editor, sprites, events, loops, conditions, variables and broadcasting, then build eight projects step by step, fro - [Your Science Exhibition Guide](https://engineergurukul.com/resources/ebooks/science-exhibition-guide/): A step-by-step guide for students of class 3 to 12, with tips for parents and teachers. Learn the kinds of entries, how to pick a topic that suits your class, how to plan your time and budget, build neatly, make charts, - [Writing a Science Project File](https://engineergurukul.com/resources/ebooks/project-report-writing/): Learn what goes into a science project file and how to write every part of it, from the cover page, certificate and acknowledgement to the aim, procedure, observations, result and bibliography. With sample text, neat tab - [Viva Questions for Science Projects](https://engineergurukul.com/resources/ebooks/viva-questions-guide/): Learn what a viva is, how to prepare for it and how to answer clearly, even when you do not know the answer. With the general questions asked about almost every project, sample questions and answers for twenty popular sc - [Physics Working Models Explained](https://engineergurukul.com/resources/ebooks/physics-working-models/): Twenty classic physics models, from the electric motor and periscope to the hydraulic lift and water level indicator. For each one you get the principle, a materials list, safe step-by-step making instructions using cell - [Safe Chemistry Projects for School](https://engineergurukul.com/resources/ebooks/chemistry-projects-safe/): Safe, clear chemistry experiments with things from the kitchen and the chemist's shop, from natural indicators and the pH scale to crystals, chromatography, rusting, splitting water with a 9 V battery and simple food adu - [Biology Models Guide](https://engineergurukul.com/resources/ebooks/biology-models-guide/): Step-by-step guides to fourteen classic biology models, from plant and animal cells, the heart and the balloon lung model to the kidney, eye, ear, brain, skeleton and DNA. Each model comes with the science, a materials l - [Maths Working Models and Activities](https://engineergurukul.com/resources/ebooks/maths-working-models/): Hands-on maths models you can make from card, paper, string and bottle caps, covering place value, integers, fractions, primes, tables, angles, Pythagoras theorem, area, volume, algebraic identities, probability, bar gra - [Best Out of Waste Science Projects](https://engineergurukul.com/resources/ebooks/best-out-of-waste-projects/): Fifteen working science models made from bottles, cartons, CDs, newspaper and other things people throw away, from a bottle windmill and a CD hovercraft to a syringe hydraulic arm, a solar oven, a rain gauge and an air-p - [Renewable Energy Models](https://engineergurukul.com/resources/ebooks/renewable-energy-models/): Build working models of solar, wind and water power with small panels, toy motors and safe low-voltage batteries. Learn how a solar cell works, test a panel with a multimeter, make a solar car, an automatic street light, - [Electricity and Magnetism Experiments](https://engineergurukul.com/resources/ebooks/electricity-magnetism-experiments/): Eighteen safe experiments with cells, bulbs, wires and magnets, each with clear steps and an observation table to fill in. Make a conductor tester, switches, a torch, an electromagnet, a compass, a simple motor and a lem - [Easy Science Projects for Class 1 to 5](https://engineergurukul.com/resources/ebooks/projects-class-1-5/): Twenty simple, safe science projects for children of class 1 to 5, made from things found at home. Each one lists what you need, gives easy steps and suggests what to say, so the child understands the science. A first ch - [Science Projects for Class 6 to 8](https://engineergurukul.com/resources/ebooks/projects-class-6-8/): Eighteen projects for class 6 to 8, matched to the topics in your science book: circuits, magnets, light, water, weather, acids and bases, the human body, friction, sound and plants. Each project gives materials, safe nu - [Science Projects for Class 9 and 10](https://engineergurukul.com/resources/ebooks/class-9-10-projects/): Eighteen science projects matched to class 9 and 10 topics, from Newton's laws and Ohm's law to electrolysis, photosynthesis and heredity. Each project gives the principle, the materials, safe numbered steps, what you sh - [Investigatory Projects for Class 11 and 12](https://engineergurukul.com/resources/ebooks/investigatory-projects-11-12/): A step-by-step guide to planning, doing and writing up an investigatory project in physics, chemistry or biology. You will learn to choose a topic you can finish, write an aim, hypothesis and variables, record and graph - [Earth, Space and Geography Models](https://engineergurukul.com/resources/ebooks/earth-space-models/): Clear explanations and step-by-step model ideas for the solar system, day and night, seasons, phases of the Moon, eclipses, the layers of the Earth, volcanoes, earthquakes, weather, maps and rainwater harvesting. You wil - [Mini and Major Project Guide](https://engineergurukul.com/resources/ebooks/engineering-project-guide/): A practical, start-to-finish guide to your mini or major project. You will learn to choose a project that fits your branch and skills, survey what others have done, plan with a block diagram and budget, simulate, build a - [Tools, Materials and Safety for Model Making](https://engineergurukul.com/resources/ebooks/model-making-tools-materials/): A friendly handbook for students, parents and teachers on the boards, glues, cutting and measuring tools, paints, wires, switches, batteries, motors and LEDs used in school models. You will learn which material to choose - [Spoken English for Daily Life](https://engineergurukul.com/resources/ebooks/spoken-english-daily/): Thirty short conversations from daily life, from meeting a new classmate to returning a faulty kettle, each with useful phrases and a tip for Hindi speakers. You will also learn how to practise, how to say tricky sounds - [English Grammar Practice Workbook](https://engineergurukul.com/resources/ebooks/english-grammar-workbook/): Short, clear lessons on the main areas of English grammar, from the parts of speech and the twelve tenses to reported speech, punctuation and common errors. Every chapter ends with an exercise and its answers, and a fina - [Job Interviews and Resumes for Freshers](https://engineergurukul.com/resources/ebooks/interview-skills-resume/): A step-by-step guide to your first job search. Learn where to find real openings, how to spot job scams, how to write a one-page fresher resume and a short cover message, and how to answer thirty common interview questio - [Cyber Safety for Students and Parents](https://engineergurukul.com/resources/ebooks/cyber-safety-for-students/): A friendly guide for students of class 5 to 12 and their parents. Learn how to protect your accounts, set up privacy, share photos wisely, deal with bullying, spot grooming, fake news and scams, balance screen time with - [Careers in Computers](https://engineergurukul.com/resources/ebooks/careers-in-computers/): A plain guide to the computer careers open after class 10, class 12 and graduation. It explains what each job involves, the skills it needs and a sensible way to learn them. It then shows how to build a portfolio, start - [Handbook for Computer Teachers](https://engineergurukul.com/resources/ebooks/computer-teacher-handbook/): A practical handbook for computer teachers and instructors. It shows how to plan a lesson, teach a skill in three steps, run and maintain a computer lab, test students fairly with rubrics, and help fast and slow learners - [Skin Care Basics](https://engineergurukul.com/resources/ebooks/beauty-skin-care/): A beginner's guide for beautician students. Learn how the skin is built, how to identify each skin type, and how to plan a daily routine with cleansing, toning, moisturising and sun protection. It also covers common skin - [Make-up Basics](https://engineergurukul.com/resources/ebooks/makeup-basics/): A step-by-step make-up guide for beautician students. Learn the tools and how to clean them, safe hygiene and patch tests, skin preparation, and colour theory for Indian skin tones. Then practise base, contour, eyes, bro - [Hygiene, Safety and Client Care in a Salon](https://engineergurukul.com/resources/ebooks/salon-hygiene-safety/): A practical guide for beautician students and salon staff. You will learn to keep hands, tools, towels and the work area clean, to use wax, electrical tools and hair chemicals safely, and to give first aid for small cuts - [Sewing Machine Basics and Hand Stitches](https://engineergurukul.com/resources/ebooks/sewing-machine-basics/): A beginner's guide to the sewing machine and the hand stitches every tailor uses. Learn the parts of the machine, how to wind the bobbin, thread it and set the tension, sew straight and zigzag seams, finish raw edges, se - [Body Measurements and Pattern Drafting](https://engineergurukul.com/resources/ebooks/pattern-drafting-measurements/): Learn to take accurate body measurements, add the right ease and draft basic patterns step by step: the bodice block, the sleeve block, a simple kurti and a basic blouse, with a guide to salwar drafting. Then lay out and - [Embroidery Stitches Handbook](https://engineergurukul.com/resources/ebooks/embroidery-stitches/): A practical handbook of thirty hand embroidery stitches, from running, stem and chain stitch to satin, long and short, French knots and bullion knots, each with clear steps and its best uses. It also covers threads, need ## Calculators and tools - [Resistor colour code calculator](https://engineergurukul.com/resources/tools/resistor-colour-code/) - [Ohm's law calculator](https://engineergurukul.com/resources/tools/ohms-law/) - [LED resistor calculator](https://engineergurukul.com/resources/tools/led-resistor/) - [Series and parallel resistor calculator](https://engineergurukul.com/resources/tools/series-parallel-resistors/) - [Battery life calculator](https://engineergurukul.com/resources/tools/battery-life/) - [Gear ratio calculator for robots](https://engineergurukul.com/resources/tools/gear-ratio/) - [Percentage and marks calculator](https://engineergurukul.com/resources/tools/percentage-marks/) - [Typing speed calculator (WPM and accuracy)](https://engineergurukul.com/resources/tools/typing-speed/) - [Interest and EMI calculator](https://engineergurukul.com/resources/tools/interest-emi/) - [GST calculator (add or remove GST)](https://engineergurukul.com/resources/tools/gst-calculator/) - [Unit converter for science and maths](https://engineergurukul.com/resources/tools/unit-converter/) - [Electricity units and cost calculator](https://engineergurukul.com/resources/tools/power-energy/) ## Careers - [What to do after class 10](https://engineergurukul.com/resources/careers/after-class-10/): A plain-words guide to the choices after class 10: Science, Commerce, Arts, polytechnic diploma, ITI and skill courses, with a checklist to see which path suits you. - [What to do after class 12](https://engineergurukul.com/resources/careers/after-class-12/): A plain-words guide to the choices after class 12: degrees, computer courses, professional courses, diplomas, skill courses and work, by stream, with a checklist to see which suits you. - [Data entry operator and office assistant](https://engineergurukul.com/resources/careers/data-entry-office-assistant/): Type, check and organise information on a computer, and keep an office running smoothly: letters, spreadsheets, email, printing and records. - [Accounts assistant (Tally and GST)](https://engineergurukul.com/resources/careers/accounts-assistant-tally/): Record a business’s sales, purchases, payments and stock on the computer, and keep the GST records that bills and returns need. - [Graphic designer and DTP operator](https://engineergurukul.com/resources/careers/graphic-designer-dtp/): Design posters, visiting cards, banners, invitations, books and social media posts, and get files ready to print sharply. - [Web developer](https://engineergurukul.com/resources/careers/web-developer/): Build and look after websites: the pages people see in the browser, and the code and databases behind them. - [Software developer (programmer)](https://engineergurukul.com/resources/careers/software-developer/): Write programs that solve problems: apps, business software, tools and systems, in languages such as C, C++, Java and Python. - [Computer hardware and networking technician](https://engineergurukul.com/resources/careers/hardware-networking-technician/): Assemble, repair and maintain computers, laptops and printers, and set up and look after office networks and Wi-Fi. - [Mobile phone repair technician](https://engineergurukul.com/resources/careers/mobile-repair-technician/): Find and fix faults in smartphones: broken screens, charging problems, batteries, speakers, water damage and software issues. - [Cyber security](https://engineergurukul.com/resources/careers/cyber-security/): Protect computers, networks and people’s data from hackers, scams and viruses, and help organisations recover when something goes wrong. - [Robotics and electronics](https://engineergurukul.com/resources/careers/robotics-electronics/): Build circuits, sensors, robots and smart devices with Arduino and other microcontrollers, for projects, labs, repairs and automation. - [Computer teacher and trainer](https://engineergurukul.com/resources/careers/computer-teacher/): Teach computers to children and adults at schools, computer centres, coaching classes and at home, from the basics and MS Office to coding. - [Beautician](https://engineergurukul.com/resources/careers/beautician/): Provide skin care, hair care, make-up and grooming services in a salon, at clients’ homes or in your own parlour, with close attention to hygiene and safety. - [Dress designer and tailor](https://engineergurukul.com/resources/careers/dress-designer-tailor/): Take measurements, draft patterns, cut and stitch garments, and design clothes for customers, boutiques and garment units. ## Store categories - [Best Out of Waste](https://engineergurukul.com/products/best-out-of-waste/): Best-out-of-waste science projects and working models made from plastic bottles, cardboard, CDs and old parts: windmill, hydraulic lift, drip irrigation, water filter and more, for school competitions and the waste-manag - [Components and Spares](https://engineergurukul.com/products/components-and-spares/): Electronic components, spares and science project material kits for school and engineering projects: DC motors, propeller fans, 9V batteries, LEDs, buzzers, sensors, switches, wires, breadboards and circuit boards. Build - [DIY Kits](https://engineergurukul.com/products/diy-kits/): DIY science experiment kits and STEM kits for kids with every part and step-by-step instructions, so students build the working model themselves and understand how it works. For science exhibitions, holiday homework, Ata - [Engineering Projects](https://engineergurukul.com/products/engineering-projects/): Minor and major projects for BTech, diploma and polytechnic students, built and tested to order with documentation: Arduino, IoT, solar, GSM, RFID, electrical and embedded-system projects. - [Major Projects](https://engineergurukul.com/products/major-projects/): Major final-year projects for diploma and BTech students: electronics, embedded systems, IoT and automation, built to order with a report and working demonstration. - [Minor Projects](https://engineergurukul.com/products/minor-projects/): Minor projects for diploma and BTech students: small electronics, sensor and embedded-system projects with a report, made to order. - [Robotics and Coding](https://engineergurukul.com/products/robotics-and-coding/): Robotics kits, Arduino and IoT project kits, line follower and obstacle avoider robots, smart dustbin and smart irrigation projects for school students, Atal Tinkering Labs, hobbyists and college. - [School Projects, Class 1 to 9](https://engineergurukul.com/products/school-projects-class-1-to-9/): Ready-made science exhibition working models and project kits for class 1 to 9: science, maths, physics, chemistry and biology models such as the volcano, solar system, phases of the moon, water filter, human heart and e - [Biology](https://engineergurukul.com/products/school-projects-class-1-to-9-biology/): Biology working models for class 1 to 9: human body systems, heart, lungs, digestive system, plant and animal cells and DNA, with multicolour lights where listed. - [Chemistry](https://engineergurukul.com/products/school-projects-class-1-to-9-chemistry/): Chemistry projects and models for class 1 to 9: acids and bases, states of matter, water purification and safe classroom experiments. - [Maths](https://engineergurukul.com/products/school-projects-class-1-to-9-maths/): Maths working models and teaching aids for class 1 to 9: number systems, geometry, types of triangles, fractions, trigonometry and algebra, for maths exhibitions and TLM. - [Physics](https://engineergurukul.com/products/school-projects-class-1-to-9-physics/): Physics working models for class 1 to 9: electric circuits, magnets, light and sound, simple machines, energy and the projects most asked for at science exhibitions. - [Science](https://engineergurukul.com/products/school-projects-class-1-to-9-science/): General science and environment working models for class 1 to 9: phases of the moon, seasons, water cycle, solar system, volcano, rainwater harvesting and pollution. - [School Projects, Class 10 to 12](https://engineergurukul.com/products/school-projects-class-10-to-12/): Working models and investigatory projects for class 10, 11 and 12 (CBSE, ICSE and state boards): physics, chemistry and biology projects such as the transformer, full wave rectifier, logic gates, EVM, human heart and adu - [Biology](https://engineergurukul.com/products/school-projects-class-10-to-12-biology/): Biology investigatory projects and working models for class 11 and 12: circulatory system, human heart, DNA, cell structure and the nervous system, with printed reports where listed. - [Chemistry](https://engineergurukul.com/products/school-projects-class-10-to-12-chemistry/): Chemistry investigatory projects for class 11 and 12: adulteration tests, chromatography, electrolysis, setting of cement and other CBSE practical topics, with printed reports where listed. - [Maths](https://engineergurukul.com/products/school-projects-class-10-to-12-maths/): Maths projects and working models for class 10 to 12: trigonometry, heights and distances, probability, coordinate geometry and number systems. - [Physics](https://engineergurukul.com/products/school-projects-class-10-to-12-physics/): Physics investigatory projects for class 11 and 12: half and full wave rectifiers, logic gates, transistors, LCR circuits, electromagnetic induction, Kirchhoff's laws and more, with printed reports where listed. - [Science](https://engineergurukul.com/products/school-projects-class-10-to-12-science/): Science working models for class 10: sources of energy, solar and wind power, rainwater harvesting, the environment and natural resources. ## Products - 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