UGC NET Communication MCQ. We covered all the UGC NET Communication MCQ in this post for free so that you can practice well for the exam.
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UGC NET Communication MCQ for Students
Sky wave propagation is not possible for frequencies
(a) equal to 30 MHz
(b) less than 30 MHz
(c) greater than 30 MHz
(d) None of these
Option c – greater than 30 MHz
The service area of space wave communication increases by ( UGC NET Communication MCQ )
(a) increasing the height of the transmitting antenna
(b) decreasing the height of receiving antenna
(c) increasing the height of both the transmitting and receiving antenna
(d) decreasing the distance between the transmitting and receiving antenna
Option c – increasing the height of both the transmitting and receiving antenna
Array gain of an antenna is
(a) directly proportional radiated by isotropic to the power antenna
(b) invesely proportional radiated by isotropic to the power antenna
(c) directly proportional to the power radiated by the practical antenna
(d) inversely proportional to the square of power radiated by the practical antenna.
Option a – directly proportional radiated by isotropic to the power antenna
The tank circuit used in a radio transmitter should have ( UGC NET Communication MCQ )
(a) high effective Q
(b) low effective Q
(c) loosely coupled load
(d) Both (a) and (c)
Option d – Both (a) and (c)
Statement 1: Short wave bands are used for the transmission of radio waves to a large distance. Statement 2: Short waves are reflected by the ionosphere.
(a) Statement -1 is false, Statement 2 is true
(b) Statement -1 is true, Statement-2 is true; Statement -2 is a correct explanation for Statement-1
(c) Statement -1 is true, Statement-2 is true; Statement -2 is not a correct explanation for Statement-1
(d) Statement -1 is true, Statement 2 is false
Option b – Statement -1 is true, Statement-2 is true; Statement -2 is a correct explanation for Statement-1
The intensity of the electric field obtained at the receiver antenna for space wave propagation is ( UGC NET Communication MCQ )
(a) directly proportional to the perpendicular distance from the transmitter to the antenna
(b) inversely proportional to the perpendicular distance from the transmitter to the antenna
(c) directly proportional to the square perpendicular distance from the transmitter to the antenna
(d) inversely proportional to the square perpendicular distance from the transmitter to the antenna
Option d – inversely proportional to the square perpendicular distance from the transmitter to the antenna
Ground waves are polarised
(a) parallel to the earth’s surface
(b) normal to the earth’s surface
(c) at an angle of 45° from the earth’s surface
(d) in any direction.
Option b – normal to the earth’s surface
Sky wave propagation is not possible for waves of frequency > 30 MHz because ( UGC NET Communication MCQ )
(a) these waves do not have much energy to reach the ionosphere
(b) they are not reflected by the ionosphere
(c) they get absorbed by the troposphere
(d) they get reflected by the stratosphere
Option b – they are not reflected by the ionosphere
Which mode of communication is most suitable for a carrier wave of frequencies around 100 MHz?
(a) Satellite
(b) Ground wave
(c) Line of sight
(d) Ionospheric
Option c – Line of sight
In which of the following areas can GPS technology be used? 1. Mobile phone operations 2. Banking operations 3. Controlling the power grids Select the correct answer using the code given below : ( UGC NET Communication MCQ )
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Option d – 1, 2 and 3
Fading of the received radio signals in a mobile communication environment occurs because of …..…..
(a) Direct propagation
(b) Multipath Propagation
(c) Bi-path Propagation
(d) None of the above
Option b – Multipath Propagation
Read the following statements with reference to MIMO. 1. It is a type of Antenna-free technology. 2. It is a type of Video communications technology. Select the correct answer using the code given below. ( UGC NET Communication MCQ )
(a) I only
(b) 2 only
(c) 1 and 2 only
(d) Neither 1 nor 2
Option d – Neither 1 nor 2
With reference to Near Field Communication (NFC) Technology, which of the following statements is/are correct? 1. It is a contactless communication technology that uses electromagnetic radio fields. 2. NFC is designed for use by devices that can be at a distance of even a meter from each other 3. NFC can use encryption when sending sensitive information. Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 Only
(c) 1 and 3 only
(d) 1, 2 and 3
Option b – 3 Only
The critical frequency that gets reflected back from the ionosphere is ( UGC NET Communication MCQ )
(a) same for all layers of the ionosphere
(b) different for different layers of the ionosphere
(c) not dependent on layers of the ionosphere
(d) None of these
Option b – different for different layers of the ionosphere
A buffer amplifier is used between one master oscillator and a Harmonic generator in AM transmitter because
(a) it reduces the S/N ratio
(b) it amplifies the signal
(c) it increases the signal frequency
(d) it avoids frequency deviation in tank-circuit
Option d – it avoids frequency deviation in tank-circuit
Which of the following happen to be the limitations of optical fiber? I. The architecture of their couplers. II. Costs of implementing them. III. Modification of the software and hardware on existing systems. IV. The difficulty of installing the cables. ( UGC NET Communication MCQ )
(a) II and IV only.
(b) I, II, and III only.
(c) I, III, and IV only.
(d) I, II, III, and IV.
Option c – I, III, and IV only
Shanon’s law relates
(a) the information carrying capacity to S/N ratio
(b) frequency to antenna gain
(c) amplitude to antenna gain
(d) antenna gain to the channel bandwidth
Option a – the information carrying capacity to S/N ratio
In sky-wave propagation, skip distance depends on ( UGC NET Communication MCQ )
(a) the frequency of e.m. waves transmitted
(b) the critical frequency of the layer
(c) the height of the layer above the earth’s surface
(d) all of the above
Option d – all of the above
Pre-emphasis in the FM system is done to
(a) compress modulating signal
(b) expand modulating signal
(c) amplify the lower frequency component of the modulating signal
(d) amplify the higher frequency component of the modulating signal
Option d – amplify the higher frequency component of the modulating signal
In an AM wave, the information is contained within ( UGC NET Communication MCQ )
(a) r.f. carrier wave
(b) only lower and upper side frequencies
(c) both r.f. carrier and side frequencies
(d) None of these
Option b – only lower and upper side frequencies
For a single sideband transmission, a balanced modulator is used to
(a) increase the power of the carrier wave
(b) increase the amplitude of the carrier wave
(c) suppress the audio signal
(d) suppress the carrier component
Option d – suppress the carrier component
The picture signal in TV broadcasts is modulated in ( UGC NET Communication MCQ )
(a) SSB
(b) VSB
(c) FM
(d) DSB
Option b – VSB
Television signals are
(a) frequency modulated
(b) amplitude modulated
(c) both frequency and amplitude modulated
(d) phase-modulated
Option c – both frequency and amplitude modulated
100% modulation in FM means
(a) actual frequency deviation > maximum allowed frequency deviation
(b) actual frequency deviation maximum allowed frequency deviation
(c) actual frequency deviation 2 maximum allowed frequency deviation
(d) actual frequency deviation <maximum allowed. frequency deviation
Option b – actual frequency deviation maximum allowed frequency deviation
Encoding of the signal is required for
(a) modulation at the transmitting end
(b) modulation at receiving end
(c) demodulation at receiving end
(d) demodulation at the transmitting end
Option a – modulation at the transmitting end
The main function of the RF amplifiers in a superheterodyne receiver is to
(a) amplify the signal
(b) reject unwanted signal
(c) discriminate against image frequency signal and IF signal
(d) all of the above
Option d – all of the above
Which of the following pair is correctly matched
(a) Radiotelegraph-VSB
(b) Television-SSB
(c) Radio broadcast-AM
(d) Radar-AM
Option c – Radio broadcast-AM
The function of an amplitude limitter in an FM receiver is
(a) to reduce the amplitude of the signal to suit the IF amplifier
(b) to amplify the low-frequency signal
(c) to eliminate any change in the amplitude of the receiver FM signal
(d) None of these
Option c – to eliminate any change in the amplitude of the receiver FM signal
Space wave communication is limited.
(a) to the line of sight distance
(b) by earth’s curvature
(c) either (a) or (b)
(d) both (a) and (b)
Option d – both (a) and (b)
The radio altimeter on an aircraft is a
(a) MTI radar
(b) continuous wave radar
(c) FM-continuous wave radar
(d) Doppler radar
Option c – FM-continuous wave radar
Long range Р g transmission of the TV signal is done by
(a) space-wave
(b) sky waves
(c) ground wave
(d) artificial satellite.
Option d – artificial satellite
Skip distance does not depend on
(a) the frequency of the signal transmitted
(b) the electron density of the layer
(c) they get absorbed by the troposphere
(d) they get reflected by the stratosphere.
Option d – they get reflected by the stratosphere
In PCM if the transmission path is very long
(a) pulse spacing is reduced
(b) pulse amplitude is increased
(c) pulse width is increased
(d) repeater stations are used.
Option d – repeater stations are used
Picture signal of TV-signal is
(a) amplitude modulated
(b) frequency modulated
(c) phase-modulated
(d) pulse modulated
Option a – amplitude modulated
Synchronizing pulses are transmitted during
(a) fly-back intervals of horizontal motion of camera scanning
(b) fly-back intervals of vertical motion of camera scanning
(c) both (a) and (b)
(d) None of these
Option c – both (a) and (b)
The intensity of the electric field obtained at the receiver antenna for space wave propagation is
(a) directly proportional to the perpendicular distance from the transmitter to the antenna
(b) inversely proportional to the perpendicular distance from the transmitter to the antenna
(c) directly proportional to the square perpendicular distance from the transmitter to the antenna
(d) inversely proportional to the square perpendicular distance from the transmitter to the antenna
Option d – inversely proportional to the square perpendicular distance from the transmitter to the antenna
E.m.wave of audible frequency cannot be directly propagated over a long distance because
(a) they have to vary small energy content
(b) the length of the antenna required for the transmission of this wave is too large
(c) both (a) and (b)
(d) neither (a) nor (b)
Option c – both (a) and (b)
For transmission of e.m.wave of audible frequency, these waves are superimposed with waves of
(a) frequency less than 20 Hz
(b) frequency less than 10 kHz.
(c) frequency in the audible range.
(d) radio-frequency.
Option d – radio-frequency
Optical fiber is used for long-distance communication because
(a) it amplifies signals to be transmitted
(b) it transfers signals faster than electrical cables
(c) it pre-emphasizes weak signals
(d) it provides little attenuation as compared to electrical cable for light propagation
Option d – it provides little attenuation as compared to electrical cable for light propagation
Optical fibers transmit light along their axis, through the process of
(a) total internal reflection
(b) refraction
(c) interference
(d) diffraction
Option a – total internal reflection
A modem is a short form of
(a) modulator-demodulator
(b) multiplexer-demultiplexer
(c) multivibrator-degenerator
(d) None of these
Option a – modulator-demodulator
Which of the following AM scheme requires the minimum transmitted power & minimum channel bandwidth?
(a) VSB
(b) DSB-SC
(c) AM
(d) SSB
Option d – SSB
A buffer amplifier is used at the transmitting end to
(a) feed carrier frequency to the master oscillator
(b) amplify carrier frequency
(c) mix modulating signal with a carrier frequency
(d) isolate the master oscillator from other stages of the transmitter.
Option d – isolate the master oscillator from other stages of the transmitter
For transmission of speeches, talks, music, dramas, etc. is used
(a) radio broadcast transmitter
(b) radiotelegraph transmitter
(c) navigation transmitter
(d) None of these
Option a – radio broadcast transmitter
During the process of transmission & reception, the signal gets deteriorated due to
(a) noise introduced in the system
(b) distortion in the system
(c) both (a) & (b)
(d) neither (a) nor (b)
Option c – both (a) & (b)
A transducer used at the transmitting end serves the purpose of converting a
(a) electrical signal to sound form
(b) sound signal to electrical form
(c) electrical signal to magnetic form
(d) sound signal to magnetic form
Option b – sound signal to electrical form
Collation is a process of
(a) sorting at the transmitting end
(b) decoding at receiving end
(c) encoding at the transmitting end
(d) storing at receiving end
Option d – storing at receiving end
The purpose of a detector at the receiving end is
(a) to amplify the signal
(b) to reduce its frequency level
(c) to modulate the signal
(d) to demodulate the signal
Option d – to demodulate the signal
The loudspeaker is a transducer used at
(a) receiving end
(b) the transmitting end
(c) both (a) & (b)
(d) neither (a) nor (b)
Option a – receiving end
Reception of information involves
(a) decoding of signal
(b) storage of signal
(c) interpretation of signal
(d) all of the above
Option d – all of the above
The term channel is used to indicate
(a) the amplitude range allocated to a given source
(b) the frequency range allocated to a given source
(c) the voltage range allocated to a given source
(d) all of the above
Option b – the frequency range allocated to a given source
The science of communication involving long distances is known as
(a) mass communication
(b) distant communication
(c) tele- communication
(d) trans-communication
Option c – tele- communication
The part of the total message that is conveyed during communication is known as
(a) text
(b) electric signal
(c) bytes
(d) information.
Option d – information
During ground wave propagation the transmitted waves get attenuated because
(a) the earth’s surface absorbs the waves
(b) the frequency of the waves is too low
(c) the energy content of these waves is high
(d) the earth’s surface offers resistance.
Option d – the earth’s surface offers resistance
Long-range propagation is not possible by space wave propagation because
(a) the height of the troposphere is quite small
(b) the height of the troposphere is large
(c) the troposphere absorbs transmitted waves
(d) None of these.
Option a – the height of the troposphere is quite small
The wave reaching the receiving antenna will have maximum intensity if the direct wave & wave after reflection from the earth’s surface
(a) are out of phase by 90°
(b) are out of phase by 270°
(c) are in phase
(d) None of these.
Option a – are out of phase by 90°
For a radio wave reaching the ionized medium
(a) will bend away from normal
(b) will bend toward normal
(c) will bend to follow a straight path
(d) None of these.
Option a – will bend away from normal
Wave obtained on the superimposition of audible frequency e.m. wave is known as
(a) carrier wave
(b) high-frequency wave
(c) modulating wave
(d) modulated wave
Option d – modulated wave
Earth’s atmosphere is transparent for
(a) only the visible light
(b) only the X-rays
(c) only the y- rays
(d) visible light and microwaves.
Option d – visible light and microwaves
Ground wave propagation is possible for
(a) low radio frequency over a short range
(b) high radio frequency over a short range
(c) high radio frequency over a long range
(d) low radio frequency over a short range.
Option a – low radio frequency over a short range
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