Q.

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 %

answer is D.

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Detailed Solution

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