Question

A stop watch has 10 divisions graduated between 0 and 5s mark. what is its least count?

Answer 1

The smallest value that can be measured with an instrument is called it's least count. The least count of a stop watch is (5-0)/10 = 0.5 sec

Answer 2

0.5 Sec would be the least count.

Explanation:

Given that,

Range of stopwatch = 5 s

Total division of stopwatch = 10

As we know that,

The least count is described as the smallest value of measurement that can be measured by using an instrument.

∵ Least count of stopwatch = Range of instrument / Total divisions

L.C = 5/10=0.5s

Learn more: the range of the instrument

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