Physics
A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

Less than one
One
More than one
Zero

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

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