Physics
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

Have its shape changed
Decrease
Increase
Remain unaffected

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Physics
We always see the same face of the moon, because

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

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