Physics
When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are

Transverse
Both longitudinal and transverse
Waves are not produced
Longitudinal

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

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
It rotates at the same speed as the earth around the sun

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