Physics
When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:

Remain same
Four times
Double
Three times

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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 takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth

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