What happens to the time period of a simple pendulum when it is taken to the moon's surface from the earth's surface?

What is the number of degrees of freedom for an oscillating simple pendulum?

$A$ simple pendulum with a bob of mass $40 \ g$ and charge $+2 \ \mu C$ makes $20$ oscillations in $44 \ s$. $A$ vertical electric field of magnitude $4.2 \times 10^4 \ NC^{-1}$ pointing downward is applied. The time taken by the pendulum to make $15$ oscillations in the electric field is (acceleration due to gravity $= 10 \ ms^{-2}$) (in $s$)

The period of a simple pendulum gets doubled when

Which vector in the figures best represents the acceleration of a pendulum mass at the intermediate point in its swing?

The graph between the time period $(T)$ and the length $(l)$ of a simple pendulum is