A-LevelPhysicsPhysical quantities and unitsFeb/Mar 2022Paper 1 Q31 Mark
A man of mass 75.2 kg uses a set of weighing scales to measure his mass three times. He obtains the following readings. mass/kg reading 1 80.2 reading 2 80.1 reading 3 80.2 Which statement describes the precision and accuracy of the weighing scales?
Anot precise to ± 0.1 kg and accurate to ± 0.1 kg
Bnot precise to ± 0.1 kg and not accurate to ± 0.1 kg
Cprecise to ± 0.1 kg and accurate to ± 0.1 kg
Dprecise to ± 0.1 kg and not accurate to ± 0.1 kg
✓ Correct Answer
The correct answer is D: precise to ± 0.1 kg and not accurate to ± 0.1 kg
📋 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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