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Physics

Physics
Find the current (in A) when a charge of 1200C flows in 6 seconds.

200
7200
100
3600

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Physics
In which of the following processes is energy released ?

Respiration
Photosynthesis
Ingestion
Absorption

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Physics
Which microscope is often used to view metal surfaces?

Scanning tunneling microscopes
Optical microscopes
None of these
Electron microscopes

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Physics
A solid needle placed horizontally on the surface of the water floats due to

Water pressure
Surface tension of water
Viscosity of water
Capillary action

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

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

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Physics
Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be

P/3
P
2p/ 3
3P

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