Physics
When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an

Rectifier
Amplifier
Oscillator
Conductor

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
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

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