A-LevelPhysicsWork, energy and powerFeb/Mar 2019Paper 1 Q171 Mark
The data below are taken from a test of a petrol engine for a motor car. power output = 150 kW fuel consumption = 20 litres per hour energy content of fuel = 40 MJ per litre What is the ratio power output / power input?
A150 × 10³ / (40 × 10⁶ × 20 × 60 × 60)
B(150 × 10³ × 60 × 60) / (20 × 40 × 10⁶)
C(150 × 10³ × 40 × 10⁶ × 20) / (60 × 60)
D(150 × 10³ × 20) / (40 × 10³ × 60 × 60)
✓ Correct Answer
The correct answer is B: (150 × 10³ × 60 × 60) / (20 × 40 × 10⁶)
📋 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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