set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

At absolute zero, Si acts as

a) metal

b) insulator

c) non-metal

d) None of these

Question : 2

Space wave propagation is:

1. tropospherical propagation
2. sky wave propagation
3. line of sight propagation

a) 1 and 3

b) 2 only

c) 1 only

d) 2, 3 and 4

Question : 3

Which of the following cannot be fabricated on an IC?

a) Inductors and transformers

b) Diodes

c) Transistors

d) Resistors

Question : 4

In frequency modulation:

a) The frequency of modulated wave varies as amplitude of modulating wave

b) The amplitude of modulated wave varies as amplitude of carrier wave

c) The amplitude of modulated wave varies as frequency of carrier wave

d) The frequency of modulated wave varies as frequency of modulating wave.

Question : 5

The service area of space wave communication increases by –

a) Decreasing the height of receiving antenna

b) Increasing the height of both transmitting and receiving antenna

c) Increasing the height of transmitting antenna

d) Decreasing the distance between transmitting and receiving antenna

Question : 6

The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as

a) Reception

b) Modulation

c) Transmission

d) Detection