Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is a very small fraction of the number of valence electrons
Is small as compared to the number of valence electrons
Is about half the number of valence electrons
Is almost equal to the number of valence electrons

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

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

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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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