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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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1.8 %

0.8 %

0.1 %

8 %

answer is D.

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Detailed Solution

The error in measurement of 25 seconds is $\frac{1}{5}$
$∴$ error in measurement of time = $\frac{\frac{1}{5}}{25} \times 100 = 0.8 %$

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