First slide
Classification of semi-conductors
Question

When  the  electrical  conductivity of a semiconductor is due to the  breaking  of  its  covalent  bonds, then  the semiconductor is said to be

Moderate
Solution

Intrinsicsemiconductor    Conductivity is due to the breaking of covalent bond 

Extrisnsicsemiconductor    Conductivity is due to the breaking  of  covalent  bond  and  excess  of  charge carriers due to impurity 

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