$A$ simple pendulum is vibrating in an evacuated chamber. It will oscillate with:

$A$ simple pendulum keeps correct time at $0^{\circ}C$. At $25^{\circ}C$,it loses $12.5 \, s$ in a day. What is the coefficient of linear expansion of the metal of the pendulum?

Two pendulums having lengths $1.0 \ m$ and $1.21 \ m$ start oscillating simultaneously in the same phase. They will again come in the same phase after how many oscillations of the smaller pendulum?

To show that a simple pendulum executes simple harmonic motion,it is necessary to assume that

If the mass of a bob of a pendulum is increased by $9$ times, the period of the pendulum will?

$A$ pendulum suspended from the ceiling of a train has a period $T$,when the train is at rest. When the train is accelerating with a uniform acceleration $a$,the period of oscillation will