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:

600 units
6 units
60 units
0.6 units

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Physics
A white and smooth surface is

Good absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing

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