Physics
The width of depletion layer of a P-N junction

Is increased under reverse bias
Decreases with light doping
Is independent of applied voltage
Increases with heavy doping

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Physics
Dynamo is a device for converting

Heat energy into electrical energy
Magnetic energy into electrical energy
Mechanical energy into electrical energy
Chemical energy into electrical energy

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

No radiation of heat takes place
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
Two thin shirts become thicker so prevent transmission of heat

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

None
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The surface of the liquid remains horizontal
The liquid surface falls down only at the center of the tank

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