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# The time period of oscillation of simple pendulum is given by $t = 2 \pi \sqrt{\large\frac{l}{g}}$ . What is the accuracy in the determination of ‘g’ if 10cm length is known to 1mm accuracy and 0.5 s time period is measured from time of 100 oscillations with a watch of 1sec. resolution?

$\pm5\%$
Hence (B) is the correct answer