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Physics

Physics
The energy of a photon varies directly with its

Frequency
None of these
Wave length
Speed

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Physics
The hair of shaving brush clings together when removed from water due to

Viscosity
Elasticity
Friction
Surface tension

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Physics
A thin oil film on a water surface appears coloured because of

Polarization
Interference
Reflection
Diffraction

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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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Physics
The best conductor of electricity among the following is :

Aluminium
Copper
Iron
Silver

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Physics
In a diesel engine the high temperature needed to ignite the fuel is achieved by

The battery
An electrical spark
Using heat from exhaust
Compressing air in the cylinders

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