Standard Science Primary 4 Energy

A metal ball can just pass through a metal ring. After the ball is heated for 2 minutes, it can no longer pass through. Why?

A The ball expanded after gaining heat.
B The ring contracted.
C The ball became heavier.
D The ring became smaller.
Show Worked Solution

Worked Solution

Step 1: When solids gain heat, they expand (increase in volume). Step 2: The heated ball becomes slightly larger. Step 3: It is now too big for the original opening of the ring.

Correct answer: The ball expanded after gaining heat.

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