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Describe a method to make a simple pendulum.

Explain the following terms associated with the Simple Pendulum :

(i) Mean Position

Explain the following term associated with the Simple Pendulum :

 Amplitude

If a simple pendulum completes $50$ oscillations in $25 \mathrm{s}$, the time of one complete oscillation is _____.

Jaipur has the longest _____ that can measure the time up to an accuracy of two seconds.

The earliest method of telling time was _____.

The SI unit of time is _____.

If a simple pendulum completes $25$ oscillations in $25$ seconds, the time of one complete oscillation is _____.