Online Test — Matter & Its Changes
10 Questions • 12 min • Chapter MCQ
12:00
Question 1 of 10
medium
Cooking an egg is ___ because you cannot get the raw egg back.
Melting
Reversible
Irreversible
Mixing only
Explanation: A cooked egg cannot return to raw — irreversible.
Question 2 of 10
medium
Water freezes into ice when it is made very…
Cold
Hot
Bright
Loud
Explanation: Cold makes water freeze into ice.
Question 3 of 10
easy
A substance that dissolves in water is said to be…
Soluble
Insoluble
Frozen
Solid only
Explanation: Things that dissolve are soluble.
Question 4 of 10
medium
Water drops on a cold glass of juice form by…
Condensation
Evaporation
Freezing
Burning
Explanation: Air's vapour condenses on the cold glass.
Question 5 of 10
easy
When a liquid is cooled and turns into a solid, it is called…
Boiling
Melting
Freezing
Dissolving
Explanation: A liquid freezes into a solid when cooled.
Question 6 of 10
medium
Tiny particles are packed most tightly in a…
Solid
Liquid
Gas
Flame
Explanation: Particles are packed closest together in solids.
Question 7 of 10
easy
Sugar stirred into water seems to vanish. We say it has…
Burned
Frozen
Melted by cold
Dissolved
Explanation: Sugar dissolves in the water.
Question 8 of 10
hard
Which of these is a reversible change?
Rusting iron
Burning wood
Cooking rice
Melting chocolate
Explanation: Melted chocolate can set again — reversible.
Question 9 of 10
medium
A gas spreads out to fill…
Nothing
A fixed shape
Only a cup
All the space it can
Explanation: Gases spread to fill all the space available.
Question 10 of 10
medium
What speeds up evaporation?
Quiet
Cold
Darkness
Heat and wind
Explanation: Heat and wind make water evaporate faster.