Olibits / Science / States of Matter
Primary 4 Science: States of Matter Practice
Real Primary 4 Science questions on States of Matter, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
Curriculum alignment
Science Teaching & Learning Syllabus, Primary Three to Six (MOE, 2023 syllabus)
Science is not a taught subject at P1/P2 under MOE's own syllabus — our P1/P2 Science content is offered as enrichment beyond the official syllabus, not as a claim of syllabus coverage at those grades.
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Real States of Matter practice questions
Why can a solid object like a stone be stacked neatly, while water cannot?
A solid has no fixed shape, but a liquid does
Water is not a real substance
A solid has a fixed shape, but a liquid does not ✓
A solid is always heavier than a liquid
A solid keeps a fixed shape, so it can be stacked, while a liquid flows and spreads to fit its container.
What happens to water when it is heated until it boils?
It becomes heavier
It changes into steam (water vapour), a gas ✓
It disappears completely and no longer exists
It changes into ice, a solid
When water is heated to its boiling point, it changes state from a liquid into steam, which is water in its gas state.
What is the change from a liquid to a gas called?
Evaporation or boiling ✓
Freezing
Condensation
Melting
A liquid changing into a gas is called evaporation (a slow change) or boiling (a fast change when heated to boiling point).
What is condensation?
The change of a gas into a liquid ✓
The change of a liquid into a gas
The change of a gas into a solid
The change of a solid into a liquid
Condensation happens when a gas, such as water vapour, cools down and changes back into a liquid, such as tiny water droplets.