Physics
The motion of a body that repeats itself after a regular interval of time is

An oscillatory motion
A simple harmonic motion
An aperiodic motion
A periodic motion

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired

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Physics
We always see the same face of the moon, because

It rotates at the same speed as the earth around the sun
It takes equal time for revolution around the earth and rotation on its own axis
It is smaller than the earth
It revolves on its axis in adirection opposite to that ofthe earth

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