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

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

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Physics
For an ideal gas, which one of the following statements does not hold true?

There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same
The speed of all gas molecules is same
The potential energy of the gas molecules is zero

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Physics
What is a compound microscope?

A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope that has one lens.
A microscope whose lenses are concave.
A microscope whose lenses are convex.

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