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

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

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat as well as electricity
a good conductor of heat as well as electricity
a bad conductor of heat but a good conductor of electricity
a good conductor of heat but a bad conductor of electricity

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