Physics
Which of the following metals is used for the manufacture of heating elements provided in electric iron ?

Nickel
Nichrome
Tungsten
Chromium

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Physics
A dynamo is a device which

Creates electrical energy
Converts electrical energy into mechanical energy
Converts mechanical energy into electrical energy
Creates mechanical energy

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Physics
Conservation of energy refers to the fact that

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

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