Materials and Components
In an intrinsic semiconductor, at a given temperature T

The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
Any of the above
The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

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Materials and Components
An atom of a rare gas is placed is an electric field E. Then

The nucleus will be shifted in a direction opposite to that of E.
The nucleus will be shifted in the direction of E by an amount which is independent of E.
The nucleus will be shifted in the direction of E by an amount which is proportional to E.
The nucleus will not be shifted.

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Materials and Components
When a material is in superconducting state and a magnetic field is applied

The superconducting property may be affected and resistivity may increase from zero to a low value
The superconducting property is not affected
The material may become an insulator
The superconducting property may be destroyed

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