Physics-
General
Easy
Question
A simple pendulum is made of a body which is a hollow sphere containing mercury suspended by means of a wire. If a little mercury is drained off, the period of pendulum will
- Remains unchanged
- Increase
- Decrease
- Become erratic
The correct answer is: Increase
When a little mercury is drained off, the position of 
of ball falls (
fixed en(d) so that effective length of pendulum increases hence 
increases
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