IMO Practice Test — Solid, Liquid & Gas
6 Questions • 12 min • Olympiad level
12:00
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
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 3 of 6
medium
Honey pours slowly while water pours fast. Both are still…
Gases
Solids
Liquids that flow
Shadows
Explanation: Both flow, so both are liquids — just at different speeds.
Question 4 of 6
hard
Wet clothes dry faster on a sunny, windy day because water…
Turns to vapour quickly in heat and wind
Becomes ice
Gets heavier
Stops moving
Explanation: Heat and wind speed up water turning to vapour.
Question 5 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 6 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.