Standard Science Primary 4 Energy

A bimetallic strip consists of Metal X and Metal Y. When heated, the strip bends towards Metal X. This means __________.

A Metal Y expands more than Metal X.
B Metal Y is a better conductor than Metal X.
C Metal X contracts more than Metal Y.
D Metal X expands more than Metal Y.
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Worked Solution

Step 1: Both metals expand when heated. Step 2: The metal that expands more becomes longer and "pushes" the strip into a curve. Step 3: The curve bends towards the shorter (less expanded) side, which is Metal X.

Correct answer: Metal Y expands more than Metal X.

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