O-LevelPhysicsThermal Physics5054/11 · May/June 2010 · Q171 Mark
A bimetallic strip made from brass and iron is used as a thermostat. When the strip is heated, the brass expands more than the iron. Which shape will the strip become?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Astrip curved downwards with brass forming the outer curve
Bstrip curved downwards with iron forming the outer curve
Cstrip curved upwards with brass forming the inner curve
Dstrip curved upwards with iron forming the inner curve
✓ Correct answer
B: strip curved downwards with iron forming the outer curve
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