Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A student observes a bimetallic strip made of brass and iron when it is heated. Brass expands more than iron for the same temperature rise.
Total: 3 marks
(a) Which metal forms the outer side of the curve on heating? (1 mark)
(b) Toward which metal does the strip bend? (1 mark)
(c) What physical property difference is demonstrated? (1 mark)
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