Q. The least count of a stop watch is $0.2$ s. The time of 20 oscillations of a pendulum is measured to be 25 s. The percentage error in the measurement of time will be
A) 8%
B) 1.8%
C) 0.8%
D) 0.1%
Explanation
$\frac{0.2}{25} \times 100 = 0.8$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.