question_answer

The p-n junction diode   works a insulator, if connected :

A)  to AC                                   

B)  in forward bias

C)  in reverse bias                 

D)  none of the above

Correct Answer: D

Solution :

                 Arsenic (As) is a pentavalent impurity which when added to a valence four semiconductor (silicon), it increases the number of free (negative) charge carries, giving rise to n-type semiconductor.