Which of the following cannot be used for measurement of time?
$(a)$. A leaking tap
$(b)$. Simple pendulum
$(c)$. Shadow of an object during the day
$(d)$. Blinking of eyes

AcademicPhysicsNCERTClass 7

Eyes don\'t blink at a fixed time interval. So blinking eyes can\'t be used for the measurement of speed.

Therefore, option $(d)$ is correct.

Updated on 10-Oct-2022 13:29:54