A-LevelPhysicsPhysical quantities and unitsOct/Nov 2011Paper 1 Q41 Mark

A micrometer is used to measure the diameters of two cylinders. diameter of first cylinder = 12.78 ± 0.02 mm diameter of second cylinder = 16.24 ± 0.03 mm The difference in the diameters is calculated. What is the uncertainty in this difference?

Q: What is the correct answer to this A-Level Physics question?

The correct answer is D: ±0.05 mm.

Q: What topic does this question test?

This question tests Physical quantities and units in A-Level Physics (syllabus code 9702). It is worth 1 mark.

A±0.01 mm

B±0.02 mm

C±0.03 mm

D±0.05 mm

✓ Correct Answer

The correct answer is D: ±0.05 mm

📋 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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About This A-Level Physics Question

Topic

This multiple-choice question tests Physical quantities and units in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics Oct/Nov 2011 examination, Paper 1 Variant 2.

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