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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


A leaking tap cannot be used for measurement of time

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"A leaking tap" is the answer because we cannot estimate when will the drop fall.
where as
⇒ simple pendulum shows time by its to and fro motion.
⇒ in olden days  the time is estimated by the shadow of an object
⇒ blinking of eyes is rarely seen which blinks by time unless by reflex actions
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