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Q.

The least count of a wrist watch graduated at every second is 

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a

one second, if it has hour hand, minute hand and second hand

b

one minute, if it has only hour hand and minute hand

c

one second in any case

d

BOTH 1 AND 2

answer is D.

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Detailed Solution

(a) The least value of measurement in option (a) is one second. So, least count is one second.

(b) The least value of measurement in option (b) is one minute. So, least count is one minute.

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