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
A transformer

Converts AC voltage to D.C. voltage
Is used to decrease or increase AC voltage
Converts DC to AC
Converts electrical energy into mechanical energy

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Physics
Scalar Quantities are

Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction
Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude and no direction

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