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Physics (AS & A Level) · Oct / Nov 2019 · Paper 12 · Question 4

9702Errors and uncertainties

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?

  1. A0.02850 ± 0.01 m
  2. B0.0285 ± 0.001 m
  3. C(2.850 ± 0.001) × 10⁻² m
  4. D(2.850 ± 0.001) × 10⁻³ m

As printed in the paper

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Correct answer: C. (2.850 ± 0.001) × 10⁻² m

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