Question

What is most important in 12th physics of chapter semiconductor and diode

Answer 1

I)

The conductivity of a semiconductor increases with increase in temperature because(a) number density of free current carriers increases.(b) relaxation time increases.(c) both number density of carriers and relaxation time increase.(d) number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density.In Fig. 14.1, Vo junction, when no battery is connected across the junction
(a) 1 and 3 both correspond to forward bias of junction(b) 3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junction(c) 1 corresponds to forward bias and 3 corresponds to reverse bias of junction.(d) 3 and 1 both correspond to reverse bias of junction.In Fig. 14.2, assuming the diodes to be ideal,
(a) D1 is forward biased and D2 is reverse biased and hence current flows from A to B(b) D2 is forward biased and D1 is reverse biased and hence no current flows from B to A and vice versa.(c) D1and D2 are both forward biased and hence current flows from A to B.(d) D1 and D2 are both reverse biased and hence no current flows from