Standard Science Primary 4 Matter

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

A The metal ring contracted.
B The metal ball gained mass.
C The metal ball expanded.
D The metal ball changed state.
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Worked Solution

Step 1: Heating causes matter to gain energy. Step [2-9]: When solids gain heat, they expand (increase in volume). Step [2-9]: The expanded ball is now larger than the ring opening.

Correct answer: The metal ball expanded.

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