In a simple pendulum experiment for determination of acceleration due to gravity \( (g) \), time...

In a simple pendulum experiment for determination of acceleration due to gravity \( (g) \), time taken for 20 oscillations is measured by using a watch of 1 second least count. The mean value of time taken comes out to be \( 30 \mathrm{~s} \). The length of pendulum is measured by using a meter scale of least count \( 1 \mathrm{~mm} \) and the value obtained is \( 55.0 \mathrm{~cm} \). The percentage error in the determination of \( g \) is close to[JEE (Main) 2019](a) \( 0.2 \% \)(b) \( 0.7 \% \)(c) \( 6.8 \% \)(d) \( 3.5 \% \)
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