At which position in the string of simple pendulum has maximum tension ?

A bob of mass $'m'$ suspended by a thread of length $l$ undergoes simple harmonic oscillations with time period ${T}$. If the bob is immersed in a liquid that has density $\frac{1}{4}$ times that of the bob and the length of the thread is increased by $1 / 3^{\text {rd }}$ of the original length, then the time period of the simple harmonic oscillations will be :-

A uniform rod of length $2.0 \,m$ is suspended through an end and is set into oscillation with small amplitude under gravity. The time period of oscillation is approximately …. $\sec$

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

A chimpanzee swinging on a swing in a sitting position, stands up suddenly, the time period will