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
0.6 units
6 units
60 units

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Physics
A Fuse wire is characterised by

High resistance and low melting point
Low resistance and low melting point
High resistance and high melting point
Low resistance and high melting point

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Physics
Conservation of energy refers to the fact that

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

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