A metre scale is graduated at every millimetre. How many significant digits will be there in a length measurement with this scale?

Answer

A, B, C, D

Explanation

The metre scale is graduated at every milimetre `1m=1000m` The minimum number of significnt digit may be 1 (e.g. for measurements like 5 mm
7 mm etc.) and the maximum number of significant digits maty be 4 (eg. 1000 mm). Hence the number of significant digits may be 1,2,3, or 4.