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mcq on Communication System. We covered all the mcq on Communication System in this post for free so that you can practice well for the exam.
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Communication System Mock test for Students
Which of the following is a drawback of FM compared to AM?
a) Requires greater bandwidth
b) Produces more noise
c) Needs higher modulation power
d) Has lower efficiency
Option a – Requires greater bandwidth
Modulation is the process of superimposing
a) a low-frequency audio signal onto a high-frequency carrier wave
b) a low-frequency radio signal onto a low-frequency audio wave
c) a high-frequency audio signal onto a low-frequency radio wave
d) a low-frequency audio signal onto a low-frequency radio wave
Option a – a low-frequency audio signal onto a high-frequency carrier wave
In amplitude modulation, the bandwidth
a) is twice the audio signal frequency
b) is three times the audio signal frequency
c) equals twice the carrier frequency
d) equals the sum of audio and carrier frequencies
Option a – is twice the audio signal frequency
In frequency modulation
a) the amplitude of the modulated wave changes with carrier frequency
b) the frequency of the modulated wave changes with the amplitude of the modulating signal
c) the frequency of the modulated wave changes with the frequency of the modulating signal
d) the frequency of the modulated wave changes with the frequency of the carrier wave
Option b – the frequency of the modulated wave changes with the amplitude of the modulating signal
Which of the following devices operates in full duplex mode?
a) Mobile phone
b) Walkie-talkie
c) Loudspeaker
d) Radio
Option a – Mobile phone
A modem is
a) only a modulating device
b) only a demodulating device
c) both modulating and demodulating device
d) only a receiving device
Option c – both modulating and demodulating device
The term ‘RADAR’ stands for
a) Radio Detection and Ranging
b) Ready Advanced Appliance for Ranging
c) Range Detection Appliance for Airplane Ranging
d) Ready Advanced Airplane Ranging
Option a – Radio Detection and Ranging
The type of waves used in radar systems are
a) ultraviolet waves
b) infrared waves
c) microwaves
d) radio waves
Option c – microwaves
Consider the statements: I. Radar helps in locating and guiding objects like airplanes, ships, and missiles. II. A TV remote control is an electronic device containing an integrated circuit. III. Loss of signal strength during transmission through a Communication channel is called noise. Which of these statements are correct?
a) I and II
b) Only II
c) II and III
d) All of these
Option a – I and II
The process of extracting the audio signal from the modulated wave is called
a) Demodulation
b) Amplitude modulation
c) Frequency modulation
d) None of these
Option a – Demodulation
Consider the statements: I. A repeater combines a receiver and a transmitter. II. The wave obtained by superimposing the audio signal on a carrier wave is called a modulated wave. III. Sky waves are AM radio waves reflected back from the ionosphere. Which of these statements are correct?
a) Only I
b) II and III
c) I and III
d) All of these
Option d – All of these
Assertion (A): Short wave bands are used to transmit radio signals over long distances. Reason (R): Short waves are reflected by the ionosphere.
a) Both A and R are true, and R correctly explains A
b) Both A and R are true, but R does not explain A correctly
c) A is true, but R is false
d) A is false, but R is true
Option a – Both A and R are true, and R correctly explains A
Assertion (A): Microwave propagation is more efficient than sky wave propagation. Reason (R): Microwaves, with frequencies between 100–300 GHz, have excellent directional properties.
a) Both A and R are true, and R correctly explains A
b) Both A and R are true, but R does not explain A correctly
c) A is true, but R is false
d) A is false, but R is true
Option a – Both A and R are true, and R correctly explains A
Which type of waves are used for Communication in artificial satellites?
a) Infrared waves
b) Radio waves
c) Ultraviolet rays
d) Amplitude modulation waves
Option b – Radio waves
Which electromagnetic radiation is used for satellite Communication?
a) Ultraviolet
b) Infrared
c) Microwave
d) Millimeter wave
Option c – Microwave
In a Communication system, noise most commonly affects the signal
a) at the transmitter
b) during transmission in the channel or line
c) at the information source
d) at the receiver
Option d – at the receiver
Which of the following is an example of point-to-point Communication?
a) FM radio
b) Standard FM radio
c) Television
d) Telephony
Option d – Telephony
The waves that get reflected back by the ionosphere are called
a) ground waves
b) surface waves
c) direct waves
d) sky waves
Option d – sky waves
Electromagnetic waves with frequencies between 2 MHz and 30 MHz are used in
a) ground wave propagation
b) sky wave propagation
c) microwave propagation
d) satellite Communication
Option b – sky wave propagation
Radio signals can be transmitted from one place to another through
a) ground wave propagation
b) sky wave propagation
c) space wave propagation
d) all of the above
Option d – all of the above
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