Physics
When a detergent is added to pure water, its surface tension

Increases
Decreases
Remains constant
Becomes infinite

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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 solar radiations particularly cosmic rays on carbon dioxide present in the 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 rotates at the same speed as the earth around the sun
It is smaller than the earth
It revolves on its axis in adirection opposite to that ofthe earth
It takes equal time for revolution around the earth and rotation on its own axis

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