Physics
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

Newton's third law
Law of inertia
Pascal's law
Newton's second law

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Physics
Radiocarbon is produced in the atmosphere as a result of

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

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

It is smaller than the earth
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

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