A-LevelPhysicsPhysical quantities and units9702/12 · Oct/Nov 2011 · 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?

A±0.01 mm

B±0.02 mm

C±0.03 mm

D±0.05 mm

✓ Correct answer

D: ±0.05 mm

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2011 Paper 1 Variant 2, question 4.

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