A-LevelPhysicsPhysical quantities and unitsMay/June 2010Paper 1 Q31 Mark
A student finds the density of a liquid by measuring its mass and its volume. The following is a summary of his measurements. mass of empty beaker = (20 ± 1)g mass of beaker + liquid = (70 ± 1)g volume of liquid = (10.0 ± 0.6) cm³ He correctly calculates the density of the liquid as 5.0 g cm⁻³. What is the uncertainty in this value?
A0.3 g cm⁻³
B0.5 g cm⁻³
C0.6 g cm⁻³
D2.6 g cm⁻³
✓ Correct Answer
The correct answer is B: 0.5 g cm⁻³
📋 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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