Olibits / Science / Water Cycle & Change of State
Primary 5 Science: Water Cycle & Change of State Practice
Real Primary 5 Science questions on Water Cycle & Change of State, 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 Water Cycle & Change of State practice questions
A pupil takes an ice cube out of the freezer and leaves it on a plate at room temperature until it turns into a puddle of water. For the ice to melt like this, does it need to gain heat or lose heat?
Gain heat ✓
Lose heat
Melting happens when a solid gains heat energy until it changes into a liquid.
A pupil places a cup of water in the freezer to turn it into ice for an experiment. For water to freeze into ice like this, does it need to gain heat or lose heat?
Gain heat
Lose heat ✓
Freezing happens when a liquid loses heat energy until it becomes a solid.
A pot of water on a stove is heated until bubbles form rapidly throughout the whole pot, not just at the surface. What is happening to the water at this point, called boiling?
A gas changing into a liquid when cooled
A liquid slowly changing into a gas only at its surface
A liquid changing rapidly into a gas throughout the whole liquid when heated to its boiling point ✓
A solid changing directly into a gas
Boiling is when a liquid changes rapidly into a gas throughout the whole liquid once it reaches its boiling point - unlike evaporation, which happens only at the surface.
Puddles of water on the ground disappear on a hot, sunny day mainly because of which process?
Condensation
Precipitation
Freezing
Evaporation ✓
Heat from the sun causes the water in the puddles to evaporate and change into water vapour.