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

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.

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Updated on: 10-Oct-2022

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