Answers

2014-06-18T13:49:45+05:30
The time period first increases then decreases .As water starts draining out, Centre of Mass of system starts shifting down, hence increasing the effective length. As a certain amount of water drains the COM of system again starts shifting back to its orginal position, thus decreasing the effective length. Hence the time period first increases then decreases .
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2014-06-18T14:18:30+05:30
The water inside the bob start to leak and due to this leakage the mass of the bob reduces and due to which the movement of the bob increases
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