The least count of a stop watch is \( 0.2 \mathrm{~s} \). The time of 20 oscillations of a pendu...

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The least count of a stop watch is \( 0.2 \mathrm{~s} \). The time of 20 oscillations of a pendulum is measured to be \( 25 \mathrm{~s} \). The percentage error in the time period is
(a) \( 1.2 \% \)
(b) \( 0.8 \% \)
(c) \( 1.8 \% \)
(d) None of these
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