Least count of stop watch is frac{1}{5},second . time of 20 oscillations of pendulum is measur

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1.Units, Dimensions and Measurement

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The least count of stop watch is $\frac{1}{5}\,second$. The time of $20$ oscillations of pendulum is measured to be $25\,seconds$. Then percentage error in the measurement of time will be.......... $\%$

A

$8$

B

$1$

C

$0.8$

D

$16$

Solution

$\frac{\Delta \mathrm{t}}{\mathrm{t}} \times 100=\frac{0.2}{25} \times 100=0.8 \%$

Standard 11

Physics

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