# 20 Science Olympiad Questions for Class 3 with Answers
Are you looking for Science Olympiad questions for Class 3 with answers?
Class 3 is an excellent stage for children to move from simple observation to deeper scientific thinking.
This free practice test contains 20 Class 3 Science Olympiad-style questions covering:
- Plants
- Animals
- Human body
- Food and nutrition
- Living and non-living things
- Air and water
- Weather
- Environment
- Matter and materials
- Force and movement
- Everyday science
- Logical thinking
Try to solve all 20 questions before checking the answers.
Let's begin!
---
# Class 3 Science Olympiad Practice Questions
## Question 1 – Living Things
Which characteristic is common to living things?
A. They never change
B. They grow and need energy
C. They are always made of metal
D. They cannot reproduce
**Answer: B. They grow and need energy**
Explanation:
Living things carry out life processes such as growth, respiration and reproduction.
---
## Question 2 – Plants
Which part of a plant carries water and minerals from the roots towards other parts?
A. Flower
B. Stem
C. Fruit
D. Seed
**Answer: B. Stem**
Explanation:
The stem supports the plant and contains tissues that transport water and minerals to other parts.
---
## Question 3 – Photosynthesis
Plants use sunlight to help make food mainly in their:
A. Roots
B. Leaves
C. Flowers
D. Fruits
**Answer: B. Leaves**
Explanation:
Green leaves contain chlorophyll and are the main sites of photosynthesis in most plants.
---
## Question 4 – Plant Needs
Which combination is important for healthy plant growth?
A. Water, sunlight and air
B. Plastic, glass and metal
C. Toys, books and pencils
D. Salt, oil and sugar
**Answer: A. Water, sunlight and air**
---
## Question 5 – Animals
Which animal is a herbivore?
A. Lion
B. Tiger
C. Cow
D. Eagle
**Answer: C. Cow**
Explanation:
Herbivores mainly eat plants or plant material.
---
## Question 6 – Food Chain
Which sequence represents a simple food chain correctly?
A. Grass → Cow → Lion
B. Lion → Grass → Cow
C. Cow → Grass → Lion
D. Grass → Lion → Cow
**Answer: A. Grass → Cow → Lion**
Explanation:
The cow can eat grass, and a lion can prey on some herbivores.
---
## Question 7 – Human Body
Which organ pumps blood around the body?
A. Lungs
B. Brain
C. Heart
D. Stomach
**Answer: C. Heart**
Explanation:
The heart pumps blood throughout the body.
---
## Question 8 – Digestion
Which organ helps begin the digestion of food?
A. Mouth
B. Ear
C. Eye
D. Nose
**Answer: A. Mouth**
Explanation:
Digestion begins in the mouth. Teeth break food into smaller pieces and saliva starts the digestion of some food components.
---
## Question 9 – Sense Organs
Which sense helps us identify the smell of a flower?
A. Sight
B. Hearing
C. Smell
D. Touch
**Answer: C. Smell**
---
## Question 10 – Healthy Food
Which meal is the most balanced choice?
A. Only sweets
B. Only chips
C. A variety of vegetables, grains and protein-rich foods
D. Only soft drinks
**Answer: C. A variety of vegetables, grains and protein-rich foods**
Explanation:
A balanced diet contains a variety of foods that provide different nutrients.
---
# 🌟 Challenge Round
Now let's try some questions that require a little more thinking.
---
## Question 11 – States of Matter
Which of the following has a definite shape and definite volume?
A. Solid
B. Liquid
C. Gas
D. Air
**Answer: A. Solid**
Explanation:
A solid generally has a definite shape and volume.
---
## Question 12 – Change of State
What happens when ice is heated?
A. It changes into water
B. It changes into wood
C. It becomes soil
D. Nothing happens
**Answer: A. It changes into water**
Explanation:
When ice receives enough heat, it melts and becomes liquid water.
---
## Question 13 – Water
Which process changes liquid water into water vapour?
A. Freezing
B. Melting
C. Evaporation
D. Condensation
**Answer: C. Evaporation**
Explanation:
Evaporation is the process in which liquid water changes into water vapour.
---
## Question 14 – Air
Moving air is called:
A. Rain
B. Wind
C. Cloud
D. Steam
**Answer: B. Wind**
---
## Question 15 – Weather
Which instrument is commonly used to measure temperature?
A. Thermometer
B. Ruler
C. Compass
D. Balance
**Answer: A. Thermometer**
---
## Question 16 – Environment
Which action can help reduce waste?
A. Reusing suitable items
B. Throwing everything away immediately
C. Leaving waste in parks
D. Throwing plastic into rivers
**Answer: A. Reusing suitable items**
Explanation:
Reusing suitable items can reduce the amount of waste we produce.
---
## Question 17 – Force
What happens when you push a stationary toy car?
A. It may start moving
B. It always disappears
C. It becomes a plant
D. Nothing can happen
**Answer: A. It may start moving**
Explanation:
A push is a type of force that can change an object's motion.
---
## Question 18 – Shadows
When is a shadow generally formed?
A. When light is blocked by an opaque object
B. Only when there is no light
C. Only inside water
D. When an object disappears
**Answer: A. When light is blocked by an opaque object**
Explanation:
A shadow forms when an object blocks some or all of the light travelling towards a surface.
---
## Question 19 – Reasoning
A plant is kept inside a dark cupboard for several days.
What is most likely to happen?
A. It may become weak because it is not receiving enough light
B. It will always grow faster
C. It will turn into an animal
D. Nothing will change
**Answer: A. It may become weak because it is not receiving enough light**
Explanation:
Plants generally need light for photosynthesis. Keeping a plant in darkness for an extended period can affect its growth and health.
---
## Question 20 – Olympiad Challenge
A wet shirt is hung outside on a warm, sunny day.
After some time, the shirt becomes dry.
What is the best explanation?
A. The water evaporated
B. The shirt drank the water
C. The water turned into soil
D. The water disappeared without changing
**Answer: A. The water evaporated**
Explanation:
Heat from the surroundings helps water change from liquid into water vapour. This process is called evaporation.
---
# 🏆 Answer Key
| Question | Answer |
|---|---|
| 1 | B |
| 2 | B |
| 3 | B |
| 4 | A |
| 5 | C |
| 6 | A |
| 7 | C |
| 8 | A |
| 9 | C |
| 10 | C |
| 11 | A |
| 12 | A |
| 13 | C |
| 14 | B |
| 15 | A |
| 16 | A |
| 17 | A |
| 18 | A |
| 19 | A |
| 20 | A |
---
# ⭐ Check Your Score
### 🏆 18–20 Correct — Excellent!
Fantastic work!
Your science knowledge and reasoning skills are developing very well.
### ⭐ 15–17 Correct — Very Good!
Great job!
Review the questions you missed and try similar questions again.
### 👍 10–14 Correct — Good Start!
You have a good foundation.
Continue practising regularly.
### 💪 Below 10 — Keep Practising!
Don't worry.
Go back to the concepts, understand them and try again.
Remember:
**Every mistake helps you learn something new.**
---
# 📚 Important Class 3 Science Olympiad Topics
The exact syllabus depends on the Olympiad organiser.
Depending on the examination, Class 3 students may encounter topics such as:
- Living and non-living things
- Plants
- Animals
- Human body
- Food and nutrition
- Air
- Water
- Weather
- Matter and materials
- Force and movement
- Environment
- Safety
- Natural resources
- Everyday science
- Logical reasoning
- Higher-order thinking
Always check the official syllabus of the particular Olympiad before preparing.
---
# 🧠 How to Prepare for Class 3 Science Olympiad
Use the following learning cycle:
## 1. Observe
Look carefully at the world around you.
↓
## 2. Ask
Ask questions about what you observe.
↓
## 3. Understand
Learn the scientific concept.
↓
## 4. Practise
Solve questions.
↓
## 5. Explain
Explain the answer in your own words.
↓
## 6. Revise
Review your mistakes.
This approach encourages understanding rather than memorisation.
---
# 🔬 Simple Science Activities for Class 3
## Activity 1 – Evaporation
Place a small amount of water in two plates.
Keep one in a warm place and another in a cooler place.
Observe which one loses water faster.
Ask:
**Why might this happen?**
---
## Activity 2 – Shadow Observation
Place an object in sunlight.
Observe its shadow.
Check the shadow again at another time of the day.
Ask:
**Did the size or direction change?**
---
## Activity 3 – Plant Observation
Choose a healthy plant.
Observe:
- Roots
- Stem
- Leaves
- Flowers
- Fruits
Ask your child to explain the function of each part.
---
## Activity 4 – Floating and Sinking
With safe household objects, predict which objects will float or sink in water.
First ask the child to make a prediction.
Then test it.
Discuss the result.
---
# ⏰ Simple Daily Science Routine
A simple routine could be:
### 10 minutes
Read one concept.
### 10 minutes
Solve practice questions.
### 10 minutes
Perform or discuss an observation/activity.
### 5 minutes
Review mistakes.
**Total: About 35 minutes**
The routine can be adjusted according to the child's school workload and attention span.
---
# 👨👩👧 Parent Tip
Don't always give the answer immediately.
Ask questions such as:
**What do you observe?**
**Why do you think this happened?**
**Can you give an example?**
**What might happen if we change this?**
These questions encourage scientific reasoning.
---
# 🎯 Science Is About Understanding
A student may memorise:
**"Water evaporates."**
But a stronger learner asks:
**"Why does wet clothing dry faster on a warm day?"**
That is the type of thinking that makes science interesting.
Encourage your child to connect textbook concepts with everyday experiences.
---
# 📈 Track Your Progress
Parents can maintain a simple record:
| Test | Score | Weak Topic |
|---|---:|---|
| Test 1 | 11/20 | Plants |
| Test 2 | 14/20 | Human Body |
| Test 3 | 16/20 | Matter |
| Test 4 | 18/20 | Environment |
The objective is not simply a high score.
The objective is **steady improvement**.
---
# 🌟 More Olympiad Resources
If you enjoyed this Class 3 Science practice test, explore more resources from Olympiad Digital:
👉 20 Maths Olympiad Questions for Class 1
👉 20 Maths Olympiad Questions for Class 2
👉 20 Maths Olympiad Questions for Class 3
👉 20 Science Olympiad Questions for Class 1
👉 20 Science Olympiad Questions for Class 2
👉 How to Start Olympiad Preparation from Class 1
👉 How to Prepare for Olympiad Exams at Home
👉 How to Improve Olympiad Score and Rank
👉 Olympiad Exam Syllabus for Classes 1–12
We are building a growing collection of Olympiad learning resources for students from Classes 1–12.
---
# Final Thoughts
Science is not simply a subject in a textbook.
It is something we experience every day.
A plant uses sunlight.
Water evaporates.
Ice melts.
A push can move an object.
Our heart pumps blood.
A shadow forms when light is blocked.
When children learn to observe these everyday events and ask questions about them, science becomes much more meaningful.
Encourage your child to:
**Observe.**
**Question.**
**Think.**
**Experiment safely.**
**Learn.**
**Improve.**
### 🔬 Observe.
### 🧠 Think.
### 📚 Learn.
### 🌟 Improve.
**Olympiad Digital**
**Learn. Practise. Think. Improve.**