Materials and Components
On the basis of the type of chemical bonds, solids may be classified into

Ionic crystals, valence crystals, metal and vander wall crystals
Ionic crystals
Ionic crystal, valence crystals and metals
Ionic and valence crystals

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

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
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
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
Any of the above

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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 destroyed
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

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