Physics
Choose the most appropriate answer: Sir CV Raman was awarded Noble Prize for his work connected with which of the following phenomenon of radiation?

Scattering
Diffraction
Interference
Polarization

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Magnetic disturbances in the atmosphere

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Physics
In a bipolar junction transistor

The collector has the least concentration of impurity
The base has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The emitter has the least concentration of impurity

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