Question

A simple pendulum has a bob which is a hollow sphere full of sand and oscillated with certain period. If all that sand is drained out through a hole at its bottom, then its period
(a) increases
(b) decreases
( c) remains same
(d) is zero.

Answer 1

Correct Answer - C
During the draining of the sand, the period first increases due to change in effective length, then decreases and finally attains a value that it had when the shpere was full of sand.