Class 4 practice
Class 4 science questions.
Science questions for Class 4, at the level of students aged 9–11, each with its answer and a short explanation. Try each one before opening the answer.
Which internal organ pumps blood to every part of the human body?
Level 1 of 5Show the answer
Answer: Heart
The heart is a muscular organ that pumps blood continuously. This blood carries oxygen and nutrients through the body.
Which planet is closest to the Sun in our solar system?
Level 1 of 5Show the answer
Answer: Mercury
Mercury is the first and closest planet to the Sun, followed by Venus, Earth, and Mars.
What is the process of a tiny seed growing into a young plant called?
Level 1 of 5Show the answer
Answer: Germination
Germination is the growth of a seed into a seedling when given proper water, warmth, and air.
What happens when the north pole of one magnet faces the south pole of another?
Level 1 of 5Show the answer
Answer: They attract each other
Opposite magnetic poles attract each other, while similar poles push each other away.
A dark patch forms behind an object placed in front of a light. What is it called?
Level 1 of 5Show the answer
Answer: A shadow
An opaque object blocks light from passing through. This creates a dark area behind the object, which is called a shadow.
What is an animal that eats only grass, leaves, and fruits called?
Level 1 of 5Show the answer
Answer: Herbivore
Herbivores are plant-eating animals, such as cows and deer. Carnivores eat other animals, and omnivores eat both plants and meat.
- True or false?
Liquid water turns into solid ice when it boils.
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Answer: False
Boiling turns liquid water into steam, which is a gas. Water turns into ice when it freezes.
- Fill in the blank.
Materials that block light completely and form dark shadows are called ___ (begins with o).
Level 1 of 5Show the answer
Answer: opaque
Opaque materials stop light from travelling through them, which creates a shadow behind the object.
- Fill in the blank.
Pure water freezes into solid ice at ___ degrees Celsius.
Level 1 of 5Show the answer
Answer: 0
The freezing point of pure water at normal atmospheric pressure is 0 degrees Celsius.
Which of these is the odd one out?
Level 1 of 5Show the answer
Answer: Stomach
The eyes, ears, and nose are sense organs on the head. The stomach is an internal digestive organ.
What kind of object blocks light completely and forms a dark shadow?
Level 2 of 5Show the answer
Answer: Opaque object
Opaque objects do not let any light pass through them. When light hits an opaque object, a dark shadow forms behind it.
Why do cactus plants in dry deserts have sharp spines instead of normal broad leaves?
Level 2 of 5Show the answer
Answer: To reduce water loss
Spines reduce the surface area exposed to dry desert air. This helps the cactus conserve water that would otherwise evaporate.
What process turns water vapour in the air into tiny liquid water drops on a cold glass?
Level 2 of 5Show the answer
Answer: Condensation
Condensation is the process where a gas cools down and turns into a liquid. Water vapour cools on touching the cold glass surface.
Which body part helps fish breathe dissolved oxygen in water?
Level 2 of 5Show the answer
Answer: Gills
Fish use feathery organs called gills to take in oxygen that is dissolved in the surrounding water.
Aarav mixes different substances in water. Which substance will dissolve completely in a glass of warm water?
Level 2 of 5Show the answer
Answer: Sugar
Sugar is soluble in water, so it dissolves completely to form a clear solution. Sand, sawdust, and chalk do not dissolve in water.
Animals eat fruits like mangoes and neem berries and drop the seeds far away. What is this process called?
Level 2 of 5Show the answer
Answer: Seed dispersal
Seed dispersal is the scattering of seeds away from the parent plant by animals, wind, or water.
- True or false?
The Moon produces its own light just like the Sun does.
Level 2 of 5Show the answer
Answer: False
The Moon does not make its own light. It shines because its surface reflects sunlight.
- True or false?
Liquids have a fixed shape and a fixed volume at room temperature.
Level 2 of 5Show the answer
Answer: False
Liquids have a fixed volume, but they take the shape of the container holding them.
- Fill in the blank.
The process of water vapour cooling down to form liquid droplets is called ___ (starts with 'c').
Level 2 of 5Show the answer
Answer: condensation
Condensation occurs when invisible water vapour in the air cools down and turns into water droplets.
Which substance is the odd one out when mixed in a glass of water?
Level 2 of 5Show the answer
Answer: Mustard oil
Mustard oil is insoluble and forms a separate layer, whereas common salt, sugar, and honey all dissolve in water.
These questions come from Ado’s question bank and are written with AI help. They are never used in ranked play, so practising them here can’t change anyone’s rank.
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