Science exhibition project ideas for Class 1 to 5: 10 easy working models
The school circular says “science exhibition next month” — and suddenly the whole family is involved. The best projects for young children are simple, safe, and something the child can build and explain themselves. Here are ten favourites.
On this page
1. Ten project ideas
| Project | You need | The science | Class |
|---|---|---|---|
| Volcano | Baking soda, vinegar, a bottle, clay | A chemical reaction makes carbon dioxide gas, which pushes the foam out. | 1–3 |
| Water cycle model | A bowl, cling film, ice, warm water | Water evaporates, condenses on the cold film and falls back as “rain”. | 2–4 |
| Rainwater harvesting | Cardboard house, pipe, bottle tank | Rain from the roof is collected and stored instead of running away. | 3–5 |
| Simple electric circuit | Battery, LED, wires, a switch | Electricity flows only when the circuit is closed. | 3–5 |
| Windmill | Paper, a straw, a pin, a cork | Moving air turns the blades; real windmills turn this into electricity. | 1–3 |
| Hydraulic arm | Syringes, plastic tubes, water, cardboard | Liquid pushed in one syringe moves the other (hydraulics). | 4–5 |
| Periscope | A juice carton, two small mirrors | Two mirrors at 45° let you see over walls. | 3–5 |
| Water filter | Bottle, cotton, sand, gravel, charcoal | Layers trap dirt. Filtered water is still not safe to drink without boiling. | 2–5 |
| Seed germination | Moong seeds, cotton, a glass | Seeds need water, air and warmth to sprout. | 1–3 |
| Balloon car | Bottle caps, straws, a balloon, cardboard | Air rushing backwards pushes the car forwards (action and reaction). | 3–5 |
Most of these cost under ₹200 and can be built over two weekends.
Need 50 more ideas with step-by-step pictures, costs and viva questions? See the STEM projects book. See the 50 Amazing Technology & STEM Projects for Kids →2. How to choose the right project
- Match the class. Class 1–2: one clear idea (seeds need water). Class 4–5: a working model with a reason.
- Let the child build it. Judges can tell. A simple model your child understands beats a perfect one they cannot explain.
- Prefer working models. Something that moves, lights up or changes holds attention.
- Check the theme in the circular — water, energy, environment, health are common.
- Safety first. No mains electricity, flames or sharp tools without an adult.
3. Presenting and the viva
Prepare a 30-second script with four parts: name of the project, what it does, how it works, and where it is used in real life. Practise it five times at home.
Common questions judges ask:
- What is the aim of your project?
- What materials did you use?
- How does it work?
- What would you improve?
- Where is this used in daily life?
4. Step by step: three popular projects
Volcano (Class 1–3)
- Build a cone of clay or papier-mâché around a small plastic bottle, on a tray.
- Put 2 spoons of baking soda and a drop of dish soap in the bottle (a little red food colour looks great).
- Pour in half a cup of vinegar and step back.
Explain: vinegar (an acid) reacts with baking soda (a base) and makes carbon dioxide gas, which pushes the foam out.
Water cycle in a bowl (Class 2–4)
- Pour warm water into a glass bowl and cover it tightly with cling film.
- Place ice cubes on top of the film.
- Watch drops form under the film and fall back down.
Explain: evaporation, condensation and precipitation — the same journey water takes from seas to clouds to rain.
Simple electric circuit with a switch (Class 3–5)
- Fix a 3-volt battery holder, an LED and a switch (two drawing pins and a paper clip) on cardboard.
- Connect them in a loop with wires. Note the LED’s longer leg goes to the + side.
- Press the paper clip onto both pins: the LED lights up.
Explain: current flows only around a closed loop; the switch opens and closes it, just like the switches at home.
5. Making the display chart
- Big title at the top, readable from two metres away.
- A labelled diagram in the middle.
- Three short points: aim, how it works, real-life use.
- Your child’s name, class and school at the bottom.
6. Safety checklist
- Only batteries — never mains electricity.
- No candles or flames on the exhibition table.
- Cutting and hot glue only with an adult.
- Wash hands after using vinegar, soil or charcoal.
Questions parents ask
What is the easiest science project for Class 1?
Seed germination or a paper windmill: simple to build, safe, and easy for a young child to explain.
What are good working models for Class 5?
A hydraulic arm, a periscope, a simple electric circuit with a switch, or a rainwater harvesting model.
How much should a school science project cost?
Most good projects can be made for under ₹200 using household materials.
How can my child prepare for the viva?
Practise a short script: what it is, what it does, how it works and where it is used. Then ask them the common questions at home.
50 Amazing Technology & STEM Projects for Kids
50 school projects · Class 1 to 5
- Step-by-step pictures and a materials list with costs
- Science, Scratch, Arduino, robotics and AI ideas
- Viva questions and a presentation script
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