Question

1. Explain the meaning of the term 'least count of an
instrument' by taking a suitable example.​

Answer 1

Answer:

the least count of a measuring instrument is the smallest and accurate value in the measured quantity that can be resolved on the instrument's scale. The least count of an instrument is inversely proportional to the precision of the instrument.

For example, a sundial may only have scale marks representing the hours of daylight; it would have a least count of one hour. A stopwatch used to time a race might resolve down to a hundredth of a second, its least count. The stopwatch is more precise at measuring time intervals than the sundial because it has more "counts" (scale intervals) in each hour of elapsed time. Least count of an instrument is one of the very important tools in order to get accurate readings of instruments like vernier caliper and screw gauge used in various experiments.  

Least count uncertainty is one of the sources of experimental error in measurements.