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The least count of a stop watch is 0.2 s...

The least count of a stop watch is 0.2 s, The time of 20 oscillations of a pendulum is measured to be 25s. The percentage error in the time period is

A

`8%`

B

`1.8%`

C

`0.8%`

D

`0.1%`

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The correct Answer is:
C
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