Medium Science Quiz Questions for Kids (with Answers)
Use this printable quiz list for classroom warm-ups, car trips, or revision. Tap any question to reveal the answer and a short explanation — then play the full science quiz online with hints and stars.
Questions & answers
Tap a question to reveal the answer. 35 questions below.
1. Which planet is called the Red Planet?Show answer
- Venus
- Jupiter
- Mars — correct
- Saturn
Mars looks red because its surface is covered in rusty iron oxide!
🚀 Mars has the tallest volcano in the Solar System — three times taller than Everest!
2. What is the process when a caterpillar becomes a butterfly?Show answer
- Evolution
- Metamorphosis — correct
- Photosynthesis
- Migration
Metamorphosis is the amazing transformation from caterpillar to butterfly!
🦋 Inside the chrysalis, the caterpillar's body turns to liquid before rebuilding!
3. What is the chemical symbol for water?Show answer
- WA
- HO
- H2O — correct
- O2H
Water is H2O — two hydrogen atoms bonded to one oxygen atom!
💧 The same water on Earth today existed when dinosaurs were alive!
4. Sound travels faster than light.Show answer
Answer: False
Light is much faster than sound — that is why you see lightning before hearing thunder!
⚡ Count seconds between lightning and thunder — each second is about 340 metres away!
5. What gas do plants release during photosynthesis?Show answer
- Carbon dioxide
- Oxygen — correct
- Nitrogen
- Helium
During photosynthesis, plants take in carbon dioxide and release oxygen!
🌱 One large tree can produce enough oxygen for two people for a whole year!
6. What is it called when water turns into vapour and rises?Show answer
- Condensation
- Evaporation — correct
- Freezing
- Melting
Evaporation is when liquid water heats up and turns into water vapour!
💨 About 86% of global evaporation comes from the oceans!
7. Which planet is third from the Sun in our Solar System?Show answer
- Venus
- Mars
- Earth — correct
- Mercury
Earth is the third planet from the Sun — after Mercury and Venus!
🌍 Earth is the only planet not named after a Roman or Greek god!
8. In a food chain, what are plants called?Show answer
- Consumers
- Producers — correct
- Decomposers
- Predators
Plants are producers — they make food from sunlight and start every food chain!
🌿 Without plants, almost all life on Earth would disappear within weeks!
9. Steam from a kettle is an example of which state of matter?Show answer
- Solid
- Liquid
- Gas — correct
- Plasma
Steam is water in gas form — heat gives water molecules enough energy to spread apart!
💨 Water vapour is invisible — the white "steam" you see is actually tiny water droplets!
10. Which simple machine helps you lift heavy things with less effort?Show answer
- Wheel
- Lever — correct
- Pulley
- Screw
A lever is a bar that pivots on a fulcrum — it makes lifting easier!
⚖️ Your arm is a lever — your elbow is the fulcrum!
11. What likely caused dinosaurs to become extinct?Show answer
- A giant flood
- An asteroid impact — correct
- A volcano only
- They ran out of food only
Scientists believe a massive asteroid hit Earth 66 million years ago, causing dinosaurs to die out!
☄️ The crater from that asteroid is 150 km wide — buried under Mexico!
12. Which sense helps you keep your balance?Show answer
- Smell
- Taste
- Inner ear — correct
- Touch only
Your inner ear has special sensors that detect movement and help you balance!
🤸 Astronauts feel dizzy in space because their inner ear senses no gravity!
13. What causes seasons on Earth?Show answer
- The Moon's gravity
- Earth's tilt — correct
- Earth moving closer to the Sun
- Clouds blocking the Sun
Earth's tilt means different parts get more direct sunlight at different times of year!
🌍 When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere!
14. Venus is the hottest planet in our Solar System.Show answer
Answer: True
Venus is the hottest planet — its thick atmosphere traps heat like a greenhouse!
🔥 Venus is hot enough to melt lead — about 465°C on its surface!
15. What energy source do solar panels use?Show answer
- Wind
- Sunlight — correct
- Coal
- Water waves
Solar panels capture sunlight and convert it into electricity!
☀️ The Sun sends more energy to Earth in one hour than humans use in a whole year!
16. What is a habitat?Show answer
- A type of food
- A natural home for a living thing — correct
- A kind of weather
- A science experiment
A habitat is the natural environment where a plant or animal lives!
🌳 A single oak tree can be a habitat for over 500 different species!
17. Who is famous for inventing the practical light bulb?Show answer
- Isaac Newton
- Thomas Edison — correct
- Albert Einstein
- Galileo
Thomas Edison developed a long-lasting light bulb in 1879!
💡 Edison held over 1,000 patents — one of the most prolific inventors ever!
18. Which instrument measures how fast the wind is blowing?Show answer
- Thermometer
- Barometer
- Anemometer — correct
- Rain gauge
An anemometer measures wind speed — spinning cups show how fast air is moving!
💨 The fastest wind ever recorded on Earth was 408 km/h in a tornado!
19. Which organisms break down dead plants and animals in ecosystems?Show answer
- Producers
- Predators
- Decomposers — correct
- Herbivores
Decomposers like fungi and bacteria break down dead matter and return nutrients to the soil!
🍄 Fungi are more closely related to animals than to plants!
20. The Sun is a planet.Show answer
Answer: False
The Sun is a star, not a planet — planets orbit around it!
☀️ The Sun contains 99.8% of all the mass in our Solar System!
21. Coal, oil and natural gas are examples of what?Show answer
- Renewable energy
- Fossil fuels — correct
- Metals
- Rocks only
Fossil fuels formed over millions of years from ancient living things!
⛏️ Coal was formed from plants that lived over 300 million years ago!
22. What is the outermost layer of Earth called?Show answer
- Core
- Mantle
- Crust — correct
- Atmosphere
Earth's crust is the thin outer layer where we live — it includes land and ocean floor!
🪨 Earth's crust is thinner than the skin of an apple compared to Earth's size!
23. Where do amphibians like frogs live?Show answer
- Only in deserts
- On land and in water — correct
- Only in the ocean
- Only in trees
Amphibians live both on land and in water — their name means "double life"!
🐸 The glass frog has see-through skin — you can see its heart beating!
24. What must an electric circuit have for electricity to flow?Show answer
- A magnet
- A complete loop — correct
- A mirror
- A fan
Electricity flows in a complete circuit — if the loop breaks, the current stops!
⚡ Lightning is a giant natural electric circuit between clouds and the ground!
25. What shape does a tornado usually have?Show answer
- A cube
- A funnel — correct
- A flat circle
- A triangle
Tornadoes are spinning columns of air shaped like a funnel!
🌪️ The widest tornado ever recorded was 4 km across!
26. What does a herbivore eat?Show answer
- Meat only
- Plants — correct
- Rocks
- Insects only
Herbivores eat plants — carnivores eat meat and omnivores eat both!
🦒 A giraffe's tongue is about 50 cm long — perfect for reaching leaves!
27. All insects have six legs.Show answer
Answer: True
All insects have exactly six legs — that is one of the rules that defines an insect!
🐜 Ants outnumber humans by about 1.4 million to one on Earth!
28. Which animal was the first to orbit Earth in space?Show answer
- A cat
- A dog named Laika — correct
- A monkey
- A rabbit
Laika, a dog, became the first animal to orbit Earth aboard Sputnik 2 in 1957!
🚀 Fruit flies were actually the first living things sent to space — in 1947!
29. Why is recycling important for the environment?Show answer
- It makes things heavier
- It reduces waste — correct
- It uses more energy
- It creates more pollution
Recycling turns old materials into new products and reduces waste in landfills!
♻️ Recycling one aluminium can saves enough energy to run a TV for three hours!
30. What does a battery store?Show answer
- Water
- Energy — correct
- Air
- Light
Batteries store chemical energy and convert it into electrical energy!
🔋 The first battery was invented over 200 years ago by Alessandro Volta!
31. What are fluffy white clouds called?Show answer
- Cumulus — correct
- Stratus
- Cirrus
- Nimbus
Cumulus clouds are the puffy white clouds you see on fair weather days!
☁️ Cloud names come from Latin — "cumulus" means "heap" or "pile"!
32. Who invented the telephone?Show answer
- Thomas Edison
- Alexander Graham Bell — correct
- Nikola Tesla
- Benjamin Franklin
Alexander Graham Bell invented the telephone and made the first call in 1876!
📞 Bell's first words on the telephone were: "Mr Watson, come here, I want to see you!"
33. Plants take in carbon dioxide and release oxygen.Show answer
Answer: True
Plants absorb carbon dioxide and release oxygen — the opposite of what animals do!
🌱 About half of the world's oxygen comes from ocean plants called phytoplankton!
34. What is the largest organ on the human body?Show answer
- Heart
- Brain
- Skin — correct
- Liver
Your skin is your largest organ — it protects your body and senses touch!
🖐️ You shed about 30,000 to 40,000 skin cells every hour!
35. Which energy source will never run out?Show answer
- Coal
- Oil
- Solar power — correct
- Natural gas
Solar power is renewable — the Sun keeps shining and will not run out!
🌬️ Wind power has been used for over 5,000 years — ancient sailors used wind in sails!
Medium Science Quiz Questions for Kids (with Answers)