IMO Practice Test: Solid, Liquid & Gas | Class 2 Science

Question 1 of 6 hard

Why can you stack books but not 'stack' water?

Books are gas

Books are wet

Water is solid

Books are solid and keep shape; water flows

Explanation: Solids hold shape and can stack; liquids flow away.

Question 2 of 6 medium

Why is your shadow NOT matter?

It moves

It is dark

It takes up no space and has no weight

It is on the ground

Explanation: A shadow is just darkness — it has no space or weight.

Question 3 of 6 hard

A balloon blown up with air feels fuller. This shows…

Air is a sound

Air is empty

Air is light only

Air is matter and takes up space

Explanation: Air fills the balloon because it takes up space.

Question 4 of 6 hard

You smell food cooking from another room. This shows that a gas can…

Stay in one spot

Spread through the air

Turn solid

Stop moving

Explanation: Smell spreads because gases move through the air.

Question 5 of 6 hard

A puddle dries up in the sun because the water…

Sinks into the sky

Turns into vapour and rises into the air

Becomes ice

Disappears forever

Explanation: The Sun's heat turns puddle water into vapour that rises.

Question 6 of 6 hard

Oil floats on water. This shows that two liquids can…

Be gases

Be solids

Have different weights for the same amount

Never mix

Explanation: Lighter oil floats on heavier water.

IMO Practice Test — Solid, Liquid & Gas