A-LevelPhysicsWork, energy and powerOct/Nov 2019Paper 1 Q141 Mark
The gas in an engine does work on a piston of cross-sectional area 80 cm². The pressure on the piston has a constant value of 4.6 × 10⁵ Pa. [Figure showing a piston moving 25 cm, with 'force of gas pushing piston'] How much work is done by the gas on the piston when it moves through a distance of 25 cm?
A9.2 × 10² J
B9.2 × 10⁴ J
C9.2 × 10⁶ J
D9.2 × 10⁸ J
✓ Correct Answer
The correct answer is A: 9.2 × 10² J
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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