Physics
The force exerted by a magnet is an example of ________

Electrostatic force
Contact force
Muscular force
Non-contact force

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Physics
Indicate the false statement about the resistance of a wire

It depends on material of wire
It is directly proportional to the length of wire
Resistance of metallic wire increases with increase in temperature
It is directly proportional to the area of cross-section of wire

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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 ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Lightning discharge in atmosphere.

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