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  4. A student measured the diameter of a wire using a screw gauge with the least count 0.001 cm and listed the measurements. The measured value should be recorded as

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Q. A student measured the diameter of a wire using a screw gauge with the least count $0.001\, cm$ and listed the measurements. The measured value should be recorded as

AIEEEAIEEE 2012Physical World, Units and Measurements

Solution:

The least count (L.C.) of a screw guage is the smallest length which can be measured accurately with it.
As least count is $0.001\, cm = \frac{1}{1000}\,cm$
Hence measured value should be recorded upto 3 decimal places i.e., 5.320 cm