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 The least count of a stopwatch is 1/5 second. The time for 20 oscillations of a pendulum is measured to be 25 seconds. The percentage error in the measurement of time will be

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a
0.1 %
b
8 %
c
1.8 %
d
0.8 %

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detailed solution

Correct option is D

The error in measurement of  25 seconds is  15∴ error in measurement of time =  1525×100=0.8%

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