# 20 Science Olympiad Questions for Class 4 with Answers
Are you looking for Science Olympiad questions for Class 4 with answers?
Class 4 Science is not only about remembering facts. Students should also learn how to observe, compare, reason and apply scientific concepts to everyday situations.
This free Class 4 Science Olympiad practice test contains 20 questions covering:
- Plants
- Animals
- Food and digestion
- Human body
- Matter and materials
- Force and energy
- Air and water
- Environment
- Earth and space
- Everyday science
- Higher-order thinking
Try to solve all the questions before checking the answers.
Let's begin!
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# 🔬 Class 4 Science Olympiad Practice Questions
## Question 1 – Plants
Which part of a plant absorbs water and minerals from the soil?
A. Leaf
B. Flower
C. Root
D. Fruit
**Answer: C. Root**
Explanation:
Roots anchor the plant and absorb water and minerals from the soil.
---
## Question 2 – Photosynthesis
Which part of most green plants is mainly responsible for making food?
A. Root
B. Leaf
C. Flower
D. Seed
**Answer: B. Leaf**
Explanation:
Green leaves contain chlorophyll and are the main site of photosynthesis.
---
## Question 3 – Plant Transport
Which part of a plant helps transport water from the roots to other parts?
A. Stem
B. Flower
C. Fruit
D. Seed
**Answer: A. Stem**
Explanation:
The stem contains tissues that transport water and minerals upward through the plant.
---
## Question 4 – Animals
Which of the following is a herbivore?
A. Lion
B. Tiger
C. Cow
D. Eagle
**Answer: C. Cow**
Explanation:
Herbivores mainly eat plants or plant material.
---
## Question 5 – Food Chain
Which is a correct simple food chain?
A. Grass → Deer → Tiger
B. Tiger → Grass → Deer
C. Deer → Tiger → Grass
D. Grass → Tiger → Deer
**Answer: A. Grass → Deer → Tiger**
Explanation:
Plants are eaten by herbivores, and herbivores may be eaten by carnivores.
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# 🍎 FOOD AND HUMAN BODY
## Question 6 – Digestion
Where does digestion begin?
A. Mouth
B. Heart
C. Lungs
D. Small intestine
**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 7 – Human Body
Which organ pumps blood throughout the body?
A. Brain
B. Heart
C. Stomach
D. Lungs
**Answer: B. Heart**
---
## Question 8 – Breathing
Which organs help us breathe?
A. Kidneys
B. Lungs
C. Stomach
D. Brain
**Answer: B. Lungs**
Explanation:
The lungs are the main organs of the respiratory system and help exchange gases between the air and blood.
---
## Question 9 – Healthy Food
Which meal is most likely to provide a variety of nutrients?
A. Only sweets
B. Only chips
C. A balanced meal containing different food groups
D. Only soft drinks
**Answer: C. A balanced meal containing different food groups**
Explanation:
A balanced diet contains a variety of foods that provide different nutrients.
---
## Question 10 – Digestion
Which organ receives food from the oesophagus and helps digest it?
A. Stomach
B. Heart
C. Lungs
D. Brain
**Answer: A. Stomach**
---
# ⚙️ MATTER, FORCE AND ENERGY
## Question 11 – States of Matter
Which state of matter has a definite shape and definite volume?
A. Solid
B. Liquid
C. Gas
D. Water vapour
**Answer: A. Solid**
Explanation:
A solid generally keeps its own shape and volume.
---
## Question 12 – Change of State
What happens when ice is heated?
A. It changes into liquid water
B. It changes into soil
C. It becomes wood
D. It disappears instantly
**Answer: A. It changes into liquid water**
Explanation:
Heating ice causes it to melt into liquid water.
---
## Question 13 – Evaporation
Wet clothes dry faster on a warm, windy day mainly because:
A. Water evaporates faster
B. Clothes produce water
C. Wind freezes the clothes
D. Water becomes solid
**Answer: A. Water evaporates faster**
Explanation:
Heat provides energy for evaporation, and moving air can help remove water vapour from around the clothes.
---
## Question 14 – Force
What can a push or pull do?
A. Change an object's motion
B. Always destroy an object
C. Turn an object into water
D. Make every object disappear
**Answer: A. Change an object's motion**
Explanation:
A force can change the speed or direction of an object and can sometimes change its shape.
---
## Question 15 – Energy
Which is an important natural source of energy?
A. Sun
B. Pencil
C. Chair
D. Book
**Answer: A. Sun**
Explanation:
The Sun provides light and heat and is an important source of energy for Earth.
---
# 🌍 EARTH AND ENVIRONMENT
## Question 16 – Environment
Which action is most helpful for reducing waste?
A. Throwing everything away
B. Reusing suitable items
C. Throwing waste into rivers
D. Burning plastic everywhere
**Answer: B. Reusing suitable items**
Explanation:
Reusing suitable items can reduce the amount of waste produced.
---
## Question 17 – Water Conservation
Which action helps save water?
A. Leaving the tap running
B. Closing the tap when not needed
C. Wasting water while playing
D. Keeping taps open
**Answer: B. Closing the tap when not needed**
---
## Question 18 – Earth
Which planet do we live on?
A. Mars
B. Venus
C. Earth
D. Jupiter
**Answer: C. Earth**
---
# 🧠 HOTS – THINK AND ANSWER
## Question 19 – HOTS
Rohan places one plant near a sunny window and another plant inside a dark cupboard.
He gives both plants the same amount of water.
After several days, the plant in the cupboard becomes weak.
What is the most likely reason?
A. It received too much sunlight
B. It did not receive enough light
C. It received too much water
D. Plants do not need light
**Answer: B. It did not receive enough light**
Explanation:
Plants generally need light for photosynthesis. A plant kept in darkness for an extended period may become weak.
---
## Question 20 – HOTS Challenge
A glass contains ice cubes and water.
After some time, the ice cubes become smaller and eventually disappear into the water.
What happened?
A. The ice melted
B. The water disappeared
C. The ice became air immediately
D. The glass produced heat
**Answer: A. The ice melted**
Explanation:
Heat from the surroundings transfers to the ice, causing it to change from solid ice into liquid water.
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# 🏆 COMPLETE ANSWER KEY
| Question | Answer |
|---|---|
| 1 | C |
| 2 | B |
| 3 | A |
| 4 | C |
| 5 | A |
| 6 | A |
| 7 | B |
| 8 | B |
| 9 | C |
| 10 | A |
| 11 | A |
| 12 | A |
| 13 | A |
| 14 | A |
| 15 | A |
| 16 | B |
| 17 | B |
| 18 | C |
| 19 | B |
| 20 | A |
---
# ⭐ CHECK YOUR SCORE
### 🏆 18–20 Correct — Excellent!
Outstanding work!
You have demonstrated strong science understanding and reasoning skills.
### 🌟 15–17 Correct — Very Good!
Great job!
Review the questions you missed and practise similar concepts.
### 👍 10–14 Correct — Good Start!
You are building a strong foundation.
Focus on understanding the concepts rather than memorising answers.
### 💪 Below 10 — Keep Practising!
Don't worry.
Start with the basic concepts and practise regularly.
Every mistake is an opportunity to learn.
---
# 📚 IMPORTANT CLASS 4 SCIENCE OLYMPIAD TOPICS
Depending on the Olympiad organiser, Class 4 Science may include topics such as:
- Plants
- Animals
- Food and digestion
- Human body
- Human needs
- Matter and materials
- Force
- Work and energy
- Air
- Water
- Environment
- Earth
- Solar system
- Everyday science
- Higher-order thinking
Always check the official syllabus of the specific Olympiad before preparing.
---
# 🧠 HOW TO PREPARE FOR CLASS 4 SCIENCE OLYMPIAD
Use this simple learning cycle:
### 1. LEARN
Understand one concept.
### 2. OBSERVE
Look for the concept in everyday life.
### 3. PRACTISE
Solve questions.
### 4. EXPLAIN
Explain the answer in your own words.
### 5. REVISE
Review mistakes.
### 6. APPLY
Try to solve a new situation using the same concept.
This helps develop scientific thinking.
---
# 🔬 SIMPLE SCIENCE ACTIVITIES AT HOME
## Activity 1 – Evaporation
Put equal amounts of water in two plates.
Keep one in a warm place and another somewhere cooler.
Observe them after some time.
Ask:
**Which one lost water faster?**
**Why?**
---
## Activity 2 – Shadow Observation
Place a safe object in sunlight.
Observe its shadow.
Check it again later.
Ask:
**Has the shadow changed?**
---
## Activity 3 – Plant Observation
Observe a plant for one week.
Record:
- New leaves
- Flowers
- Height
- Soil moisture
Discuss the changes.
---
## Activity 4 – Floating and Sinking
Use safe household objects.
Before placing each object in water, ask the child:
**Will it float or sink?**
Then test the prediction.
---
# ⏰ 30-MINUTE DAILY SCIENCE ROUTINE
### 10 minutes
Learn one concept.
### 10 minutes
Solve 5–10 questions.
### 5 minutes
Do an observation or simple activity.
### 5 minutes
Review mistakes.
Regular practice is more important than studying for many hours at once.
---
# 👨👩👧 PARENT TIP
When your child gives an answer, ask:
**Why?**
For example:
Child: "The ice melted."
Parent:
**"Why did it melt?"**
Child:
"Because it received heat."
Then ask:
**"Where did the heat come from?"**
This type of conversation develops scientific reasoning.
---
# 🎯 DON'T JUST MEMORISE SCIENCE
A student may remember:
**"Water evaporates."**
But a stronger learner can explain:
**"Why do wet clothes dry faster on a warm and windy day?"**
That is the type of thinking Olympiad preparation should encourage.
---
# 📈 TRACK YOUR PROGRESS
Parents can maintain a simple record:
| Test | Score | Weak Topic |
|---|---:|---|
| Test 1 | 12/20 | Plants |
| Test 2 | 14/20 | Human Body |
| Test 3 | 16/20 | Matter |
| Test 4 | 18/20 | Environment |
The goal is:
**Understand → Practise → Improve**
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# 🌟 MORE OLYMPIAD RESOURCES FROM OLYMPIAD DIGITAL
Continue your Olympiad preparation with:
👉 20 Maths Olympiad Questions for Class 1
👉 20 Maths Olympiad Questions for Class 2
👉 20 Maths Olympiad Questions for Class 3
👉 30 Olympiad Reasoning Questions for Class 4
👉 20 Science Olympiad Questions for Class 1
👉 20 Science Olympiad Questions for Class 2
👉 20 Science Olympiad Questions for Class 3
👉 50 Olympiad Reasoning Questions for Class 1–3
👉 How to Start Olympiad Preparation from Class 1
👉 How to Prepare for Olympiad Exams at Home
👉 Olympiad Exam Syllabus for Classes 1–12
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# Final Thoughts
Science is everywhere.
Plants need light.
Our heart pumps blood.
Water changes its state.
A force can move an object.
The Sun provides energy.
Our environment needs care.
When children learn to connect these concepts with everyday life, science becomes much easier and more interesting.
Encourage your child to:
**Observe.**
**Question.**
**Think.**
**Practise.**
**Apply.**
**Improve.**
### 🔬 Observe.
### 🧠 Think.
### 📚 Learn.
### 🏆 Improve.
**Olympiad Digital**
**Learn. Practise. Think. Improve.**