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Physics · May / June 2017 · Paper 11 · Question 1

5054Physical quantities and measurement techniques

A micrometer is used to measure the diameter of a uniform wire. [diagram of micrometer with labels: wire, screw, rotating scale, fixed scale] What is done to obtain an accurate answer?

  1. AMake the micrometer horizontal and then use the scales to find the reading.
  2. BSubtract the fixed-scale reading from the rotating-scale reading.
  3. CSubtract the rotating-scale reading from the fixed-scale reading.
  4. DUse the scales to find the reading and add or subtract any zero error.

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Correct answer: D. Use the scales to find the reading and add or subtract any zero error.

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