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 fixed mass of gas undergoes three processe, B is constant pressure expansion, and C is constant pressure compression.
Total: 4 marks
(a) Which process has zero work? (1 mark)
(b) Which process has positive work done by the gas? (1 mark)
(c) Which process has negative work done by the gas? (1 mark)
(d) Name the graph quantity whose area gives work. (1 mark)
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