Physics
Tungsten is used for the manufacture of the filament of an electric bulb, because

It has a very high melting point
It is a good conductor
It is malleable
It is economical

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Physics
Radiocarbon is produced in the atmosphere as a result of

Action of ultraviolet light from the sun on atmospheric oxygen.
Lightning discharge in atmosphere.
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.

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Physics
What is the direction of torque?

Same as the direction of applied force
Parallel to the radius
Opposite to the direction of applied force
Perpendicular to the direction of applied force

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