Physics
Angle of friction and angle of repose are

Equal to each other
Proportional to each other
None of these
Not equal to each other

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Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
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.

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Physics
Negative feedback in amplifiers

Decreases bandwidth and decreases noise
Decreases bandwidth and increases noise
Increases bandwidth and increases noise
Increases bandwidth and decreases noise

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