Units & Dimensions

JEE Main level, single correct, medium

17 of 149

Question 17 of 149

A student measured the diameter of a wire using a screw gauge with the least count 0.001 cm0.001 \mathrm{~cm} and listed the measurements. The measured value should be recorded as

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Answer: (D) 5.320 cm5.320 \mathrm{~cm}

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=11000 cm0.001 \mathrm{~cm}=\frac{1}{1000} \mathrm{~cm}
Hence measured value should be recorded upto 3 decimal places i.e., 5.320 cm5.320 \mathrm{~cm}

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