A stop watch has a circular dial divided into $240$ divisions. What is its least count?

1 s

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0.5 s

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2 s

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0.25 s

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Solution

The correct option is C $0.25 s$
Time period of a stop watch $T = 60 s$
Number of divisions $N = 240$
So, least count of stop watch $L C = \frac{T}{N} = \frac{60}{240} = 0.25 s$

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