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

Question 1 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 2 of 6 hard

Butter is solid in the fridge but soft on a hot day. This shows heat can…

Make it a gas at once

Change how hard a solid is

Remove its weight

Turn it to stone

Explanation: Heat can soften or melt some solids like butter.

Question 3 of 6 hard

Why does a smell from the kitchen reach the next room?

Smell is liquid

Smell is solid

Air stops moving

Gas spreads through the air

Explanation: Gases spread, carrying the smell across rooms.

Question 4 of 6 medium

Why do water drops form on the outside of a cold glass?

Water vapour in the air cools and turns to drops

The glass leaks

Water comes through glass

The drops are oil

Explanation: Air's water vapour cools on the glass and forms drops.

Question 5 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.

Question 6 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.

IMO Practice Test — Solid, Liquid & Gas