Question

Which of the following expresses the most accurate measurement of length of a road *

500.0 mm
500 mm
50 cm
0.5 m

Answer 1

Answer:

0.5 m

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Answer 2

(A) 500.0 mm is the most accurate measurement for the length of the rod.

This is because mm (millimeters) is the least among the other units given in the options. It will be more accurate as the measurement is in a smaller unit because the measuring instrument will have the minimum least count. If we use units like centimeters or meters, the least count of the instrument would be more. Moreover, 500.0 mm is accurate up to one decimal place, 500mm and 50 cm are not accurate up to one decimal place.

What is the least count?

It is the minimum possible value that can be measured by an instrument.