Question

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​

Answer 1

Answer:

(b) Simple pendulum

Explanation:

Since the time period of the pendulum depends on the gravity of earth and the pendulum clocks mainly works on local gravity so therefore the pendulum clock in the satellite will not give the correct time and so it is not used for measuring time in a spaceship orbiting the earth.

Answer 2

Answer:

shadow of an object during the day