Physics · May / June 2017 · Paper 12 · Question 3
5054Physical quantities and measurement techniques
A micrometer is used to measure the diameter of a uniform wire. What is done to obtain an accurate answer?
- AMake the micrometer horizontal and then use the scales to find the reading.
- BSubtract the fixed-scale reading from the rotating-scale reading.
- CSubtract the rotating-scale reading from the fixed-scale reading.
- 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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