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

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

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Physics
Isotopes of an element contain

the same number of protons but different number of neutrons
equal number of protons and electrons
equal number of nucleons
the same number of neutrons but different number of protons

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

a good conductor of heat as well as electricity
a bad 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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