SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A leaking tap
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Simple pendulum
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Shadow of an object during the day
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Blinking of eyes
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Detailed explanation-1: -Blinking of eyes can be different for different people and it is not a periodic phenomenon. Hence we cannot measure time using blinking of eyes.
Detailed explanation-2: -Hand span is not used for measuring time.
Detailed explanation-3: -Within a reasonable error of measurement, sunrise and sunset are periodic events. Also new moon occurs periodically. Hence, these events can be used to measure time.
Detailed explanation-4: -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.
Detailed explanation-5: -A leaking tap is can not be used for the measurement of the time because one can not estimate when will the drop fall. The explanation for the incorrect options (B), (C), and (D): The to and fro motion of a simple pendulum shows time.