A-LevelPhysicsPhysical quantities and units9702/12 · Feb/Mar 2020 · Q51 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?

A0.01 mm

B0.02 mm

C0.03 mm

D0.05 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, Feb/Mar 2020 Paper 1 Variant 2, question 5.

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