Discussion
Which of the following is most accurate device for length measurement ?
Answer: C
The most accurate device for length measurement is the micrometer.
The passage defines accuracy as closeness of a measurement to the expected value. A micrometer screw gauge normally reads to 0.01 mm, and 0.001 mm with a vernier thimble, while vernier calipers usually read to 0.02 mm or 0.05 mm, so the micrometer can resolve and report a length more closely.
An odometer measures distance travelled only roughly, in tenths of a kilometre or so, and is affected by tyre wear. A calorimeter is not a length instrument at all; it measures heat. So the choice is between the two hand tools, and the micrometer wins on accuracy.
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