O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2025 · Q231 Mark

The diagram shows two changes of state, X and Y. [Figure 23.1] Which row gives the names of the two changes of state?

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AX: boiling, Y: freezing

BX: boiling, Y: melting

CX: condensation, Y: freezing

DX: condensation, Y: melting

✓ Correct answer

D: X: condensation, Y: melting

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2025 Paper 1 Variant 2, question 23.

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