The diameter of a wire is measured by using a micrometer screw gauge with least count of 0.01 mm. Which of the following readings will be correct?
Correct answer: C. 2.00 mm
- A. 0.20 cm
- B. 0.002 m
- C. 2.00 mm
- D. 0.2 cm
Explanation
The following is the solution:Since least count is 0.01 mm, therefore, diameter must be expressed in multiples of 0.01.2.00 mm is 200 times 0.01 mm therefore, (C).
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About Measurements
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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