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 lost heat.
B The ball became heavier.
C The ball expanded.
D The ring contracted.
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Worked Solution

Step 1: Heating causes matter to gain heat. Step 2: Most substances expand (increase in volume) when they gain heat. Step 3: The expanded ball is now too large for the ring.

Correct answer: The ball expanded.

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