HOTS Science Primary 4 Energy

A bimetallic strip consists of Metal X and Metal Y. When heated, the strip bends towards Metal X. Which statement is correct?

A Metal X contracted while Metal Y expanded.
B Metal X expanded more than Metal Y.
C Metal Y is a better conductor of heat than Metal X.
D Metal Y expanded more than Metal X.
Show Worked Solution

Worked Solution

Step 1: Heating causes both metals to expand. Step [2-9]: The metal that expands more becomes longer and pushes/curves around the shorter metal. Step [2-9]: Bending towards X means X is on the inside of the curve (shorter), so Y expanded more.

Correct answer: Metal Y expanded more than Metal X.

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free