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Physics

Physics
In nuclear reactor, heavy water is used as

Coolant
Moderator
Fuel
Atomic smasher

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Physics
If electric resistance is to be decreased, then the number of resistances should be connected in ________

Series
Mixed arrangement
None of these
Parallel

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Physics
What is the SI unit of Power?

Watt
Newton
Pascal
Boyle

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Physics
In an optical fibre the signal is transmitted

Due to total internal reflection
Due to refraction
In a curved path
In a straight line path

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Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

2P
P
< P
> P

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

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

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