Physics
The work done by the string of a simple pendulum during one complete oscillation is equal to

Kinetic energy of the pendulum
Zero
Total energy of the pendulum
Potential energy of the pendulum

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

None of these
Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break
The material of which pipes are made contracts due to cold and so breaks

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