Identify the semiconductor devices whose characteristics are given below , in the order (a) ,(b) ,(c ) ,(d) :
(a)
(b)
(c )
(d)

Options

A. (i) and (iii)
B. only (iii)
C. (ii) and some regions of (iv)
D. All the devices can be used

Answer

C

Explanation

The device which follows square law is used for modulation purpose. Characteristics shown by (i) and (iii) corresponds to linear devices.
Characteristics shown by (ii) corresponds to square law device. Some part of (i) also follow square law.
Hence, (ii) and (iv) can be used for modulation.