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 and valence crystals
Ionic crystal, valence crystals and metals

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Materials and Components
With increase in temperature, the electrical conductivity would

Decrease in metals as well as in intrinsic semiconductor
Decrease in metals but increase in intrinsic semiconductor
Increase in metals as well as in intrinsic semiconductor
Increase in metals but decrease in intrinsic semiconductor

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

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

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