Short answer·Hard exam skill (4/5)·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
An ideal gas goes through two different expansions from the same initial state. Process A is isothermal; process B is adiabatic. Both reach the same final volume.
Total: 3 marks
(a) Which process has no heat exchange? (1 mark)
(b) In which process does the gas cool? (1 mark)
(c) Which process has zero change in internal energy for an ideal gas? (1 mark)
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