Physics
The force which makes a vehicle to stop when break is applied is called

Covalant force
Vanderwalls force
Frictional force
Gravitational force

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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 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

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Physics
The velocity of sound in air

Decreases with increase of temperature
Does not depend on temperature
Increases with decrease of temperature
Decreases with decrease of temperature

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