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Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 5

9702Errors and uncertainties

The diameter of a cylindrical metal rod is measured using a micrometer screw gauge. The diagram below shows an enlargement of the scale on the micrometer screw gauge when taking the measurement. What is the cross-sectional area of the rod?

  1. A3.81 mm²
  2. B11.4 mm²
  3. C22.8 mm²
  4. D45.6 mm²

As printed in the paper

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Correct answer: B. 11.4 mm²

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