Physics
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

6 units
0.6 units
60 units
600 units

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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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