A-LevelPhysicsPhysical quantities and units9702/12 · Oct/Nov 2019 · Q41 Mark

A micrometer is used to measure the 28.50 mm width of a plastic ruler. The micrometer reads to the nearest 0.01 mm. What is the correct way to record this reading?

A0.02850 ± 0.01 m

B0.0285 ± 0.001 m

C(2.850 ± 0.001) × 10⁻² m

D(2.850 ± 0.001) × 10³ m

✓ Correct answer

C: (2.850 ± 0.001) × 10⁻² m

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 4.

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