Physics
Hydroscope is an instrument that shows changes in:

None of these
Atmospheric humidity
Sound under water
Density of liquid

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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
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

None of these
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
It will fall down at the same place where the string breaks
The ball will travel towards the center of the circle and fall down

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