Q.

Second’s pendulum is a pendulum which executes one oscillation in:

A. Half a second
B. One second
C. Two seconds
D. None of these
Answer» C. Two seconds
Explanation: A pendulum is a weight suspended from a pivot so that it can swing freely. A seconds pendulum is a pendulum whose period is precisely two seconds; one second for a swing in one direction and one second for the return swing, a frequency of 1/2 Hz.
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