Physics
For every action, there is an equal and opposite reaction, is Newton's

First law
Second law
Third law
Fourth law

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be greater than the diameter of the object.
The wavelength of the electrons must be close to the diameter of the object
Both A & B
None of these

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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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