Standard Science Primary 4 Energy

A metal ball could just pass through a ring. After heating the metal ball over a flame for 5 minutes, it could no longer pass through the ring. Why?

A The ball became heavier.
B The ball expanded and its volume increased.
C The ring contracted and became smaller.
D The ball melted slightly.
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Worked Solution

Step 1: Heating causes matter to gain heat. Step 2: Most matter expands when it gains heat. Step 3: Expansion increases volume, making the ball too large for the ring.

Correct answer: The ball expanded and its volume increased.

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