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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 transmission is not suitable for which frequency range?
(a) Equal to 30 MHz
(b) Less than 30 MHz
(c) More than 30 MHz
(d) None of these
Option c – More than 30 MHz
The coverage area of space wave communication can be extended by:
(a) Increasing the height of the transmitting antenna
(b) Lowering the height of the receiving antenna
(c) Raising the height of both transmitting and receiving antennas
(d) Reducing the distance between transmitting and receiving antennas
Option c – Raising the height of both transmitting and receiving antennas
The array gain of an antenna is:
(a) Directly related to the power radiated by an isotropic antenna
(b) Inversely related to the power radiated by an isotropic antenna
(c) Directly related to the power radiated by a practical antenna
(d) Inversely proportional to the square of the power radiated by a practical antenna
Option a – Directly related to the power radiated by an isotropic antenna
In a radio transmitter, the tank circuit should have:
(a) High effective quality factor
(b) Low effective quality factor
(c) A loosely coupled load
(d) Both high effective quality factor and a loosely coupled load
Option d – Both high effective quality factor and a loosely coupled load
Statement 1: Short wave frequencies are used for long-distance radio communication.
Statement 2: Short waves are capable of being reflected by the ionosphere.
(a) Statement 1 is false, Statement 2 is true
(b) Both statements are true, and Statement 2 correctly explains Statement 1
(c) Both statements are true, but Statement 2 does not explain Statement 1
(d) Statement 1 is true, Statement 2 is false
Option b – Both statements are true, and Statement 2 correctly explains Statement 1
The strength of the electric field received in space wave transmission is:
(a) Directly related to the distance between the transmitter and antenna
(b) Inversely related to the distance between the transmitter and antenna
(c) Directly related to the square of the distance between the transmitter and antenna
(d) Inversely related to the square of the distance between the transmitter and antenna
Option d – Inversely related to the square of the distance between the transmitter and antenna
The polarization of ground waves is typically:
(a) Parallel to the Earth’s surface
(b) Perpendicular to the Earth’s surface
(c) At a 45-degree angle to the Earth’s surface
(d) In any possible direction
Option b – Perpendicular to the Earth’s surface
Sky wave communication is not effective for frequencies above 30 MHz because:
(a) These waves lack sufficient energy to reach the ionosphere
(b) These waves are not reflected by the ionosphere
(c) These waves are absorbed by the troposphere
(d) These waves are reflected by the stratosphere
Option b – These waves are not reflected by the ionosphere
Which communication method is best suited for frequencies near 100 MHz?
(a) Satellite communication
(b) Ground wave communication
(c) Line-of-sight communication
(d) Ionospheric communication
Option c – Line-of-sight communication
GPS technology can be effectively applied in which of the following sectors?
- Mobile communication
- Banking operations
- Power grid management
(a) Only 1
(b) Only 2 and 3
(c) Only 1 and 3
(d) 1, 2, and 3
Option d – 1, 2, and 3
The fading of radio signals in mobile communication environments is mainly due to:
(a) Direct signal propagation
(b) Multipath signal propagation
(c) Two-path signal propagation
(d) None of the above
Option b – Multipath signal propagation
Consider the following about MIMO technology:
- It is an antenna-free system.
- It is a video communication technology.
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option d – Neither 1 nor 2
Regarding Near Field Communication (NFC) technology, which statements are accurate?
- NFC is a contactless system that uses electromagnetic radio fields.
- NFC operates effectively over distances up to one meter.
- NFC can use encryption to secure sensitive information.
(a) Only 1 and 2
(b) Only 3
(c) Only 1 and 3
(d) 1, 2, and 3
Option b – Only 3
The critical frequency that can be reflected by the ionosphere:
(a) Remains the same across all ionospheric layers
(b) Varies depending on the ionospheric layer
(c) Is not influenced by ionospheric layers
(d) None of these
Option b – Varies depending on the ionospheric layer
In AM transmitters, a buffer amplifier is placed between the master oscillator and harmonic generator to:
(a) Lower the signal-to-noise ratio
(b) Increase signal strength
(c) Raise the signal frequency
(d) Prevent frequency changes in the tank circuit
Option d – Prevent frequency changes in the tank circuit
Which of the following are limitations of using optical fiber systems?
I. Design of fiber couplers
II. High installation costs
III. Need to modify current software and hardware
IV. Difficulty in cable installation
(a) Only II and IV
(b) I, II, and III
(c) I, III, and IV
(d) I, II, III, and IV
Option c – I, III, and IV
Shannon’s law connects:
(a) Information capacity and signal-to-noise ratio
(b) Frequency and antenna gain
(c) Amplitude and antenna gain
(d) Antenna gain and channel bandwidth
Option a – Information capacity and signal-to-noise ratio
In sky wave communication, the skip distance depends on:
(a) The frequency of the transmitted electromagnetic waves
(b) The critical frequency of the ionospheric layer
(c) The height of the ionospheric layer above Earth’s surface
(d) All of the above
Option d – All of the above
Pre-emphasis in frequency modulation systems is used to:
(a) Compress the modulating signal
(b) Expand the modulating signal
(c) Boost lower frequency components
(d) Boost higher frequency components
Option d – Boost higher frequency components
In an AM signal, the information is present in:
(a) The radio frequency carrier
(b) Only in the lower and upper side frequencies
(c) Both the radio frequency carrier and side frequencies
(d) None of these
Option b – Only in the lower and upper side frequencies
In single sideband transmission, the balanced modulator is used to:
(a) Increase the carrier wave’s power
(b) Increase the amplitude of the carrier wave
(c) Remove the audio signal
(d) Eliminate the carrier signal
Option d – Eliminate the carrier signal
In television broadcasting, the picture signal is typically modulated using:
(a) SSB
(b) VSB
(c) FM
(d) DSB
Option b – VSB
Television transmissions generally use:
(a) Frequency modulation
(b) Amplitude modulation
(c) Both frequency and amplitude modulation
(d) Phase modulation
Option c – Both frequency and amplitude modulation
When FM is said to have 100% modulation, it means:
(a) The actual frequency deviation exceeds the allowed maximum deviation
(b) The actual frequency deviation equals the maximum permitted deviation
(c) The actual frequency deviation is double the maximum permitted deviation
(d) The actual frequency deviation is less than the maximum permitted deviation
Option b – The actual frequency deviation equals the maximum permitted deviation
Signal encoding is mainly performed for:
(a) Modulation at the transmitter side
(b) Modulation at the receiver side
(c) Demodulation at the receiver side
(d) Demodulation at the transmitter side
Option a – Modulation at the transmitter side
The primary role of RF amplifiers in a superheterodyne receiver is to:
(a) Increase the signal strength
(b) Remove unwanted signals
(c) Filter out image frequencies and intermediate frequencies
(d) Perform all of the above functions
Option d – Perform all of the above functions
Select the correctly matched pair:
(a) Radiotelegraph – VSB
(b) Television – SSB
(c) Radio broadcast – AM
(d) Radar – AM
Option c – Radio broadcast – AM
In FM receivers, the purpose of an amplitude limiter is to:
(a) Adjust the signal amplitude to match the intermediate frequency amplifier
(b) Strengthen the low-frequency signals
(c) Remove variations in the amplitude of the FM signal
(d) None of these
Option c – Remove variations in the amplitude of the FM signal
Space wave communication is restricted by:
(a) The line-of-sight range
(b) The curvature of the Earth
(c) Either of the above
(d) Both of the above
Option d – Both of the above
The radio altimeter used in aircraft functions as:
(a) MTI radar
(b) Continuous wave radar
(c) FM continuous wave radar
(d) Doppler radar
Option c – FM continuous wave radar
For long-distance television signal transmission, which method is commonly used?
(a) Space wave
(b) Sky wave
(c) Ground wave
(d) Artificial satellite
Option d – Artificial satellite
Skip distance is not influenced by:
(a) The frequency of the transmitted signal
(b) The electron density of the ionospheric layer
(c) Absorption by the troposphere
(d) Reflection by the stratosphere
Option d – Reflection by the stratosphere
In Pulse Code Modulation (PCM), when signals travel long distances:
(a) The spacing between pulses decreases
(b) The amplitude of pulses increases
(c) The width of pulses increases
(d) Repeater stations are installed
Option d – Repeater stations are installed
In TV signals, the picture signal is:
(a) Amplitude modulated
(b) Frequency modulated
(c) Phase modulated
(d) Pulse modulated
Option a – Amplitude modulated
Synchronization pulses in television signals are sent during:
(a) The horizontal retrace of the camera scanning motion
(b) The vertical retrace of the camera scanning motion
(c) Both horizontal and vertical retrace intervals
(d) None of these
Option c – Both horizontal and vertical retrace intervals
The strength of the electric field at the receiver antenna in space wave transmission is:
(a) Directly proportional to the distance from the transmitter
(b) Inversely proportional to the distance from the transmitter
(c) Directly proportional to the square of the distance from the transmitter
(d) Inversely proportional to the square of the distance from the transmitter
Option d – Inversely proportional to the square of the distance from the transmitter
Why can’t electromagnetic waves of audible frequency travel long distances directly?
(a) They have very low energy content
(b) The antenna required to transmit these waves would be extremely large
(c) Both reasons mentioned above
(d) Neither of the above reasons
Option c – Both reasons mentioned above
For transmitting electromagnetic waves of audible frequencies, these signals are combined with waves of:
(a) Frequency less than 20 Hz
(b) Frequency below 10 kHz
(c) Frequencies within the audible range
(d) Radio frequencies
Option d – Radio frequencies
Optical fiber is preferred for long-distance communication because it:
(a) Boosts the strength of transmitted signals
(b) Transmits signals more quickly than electrical cables
(c) Strengthens weaker signals
(d) Has lower signal loss compared to electrical cables when carrying light
Option d – Has lower signal loss compared to electrical cables when carrying light
Optical fibers transmit light through:
(a) Total internal reflection
(b) Refraction
(c) Interference
(d) Diffraction
Option a – Total internal reflection
The term “modem” refers to:
(a) Modulator-demodulator
(b) Multiplexer-demultiplexer
(c) Multivibrator-degenerator
(d) None of these
Option a – Modulator-demodulator
Which amplitude modulation method uses the least transmission power and bandwidth?
(a) VSB
(b) DSB-SC
(c) AM
(d) SSB
Option d – SSB
A buffer amplifier at the transmitter is used to: ( UGC NET Communication MCQ )
(a) Supply the carrier frequency to the master oscillator
(b) Increase the strength of the carrier frequency
(c) Combine the modulating signal with the carrier frequency
(d) Protect the master oscillator from other transmitter circuits
Option d – Protect the master oscillator from other transmitter circuits
Devices used to transmit speeches, music, and plays are:
(a) Radio broadcast transmitters
(b) Radiotelegraph transmitters
(c) Navigation transmitters
(d) None of these
Option a – Radio broadcast transmitters
Signals tend to degrade during transmission and reception because of: ( UGC NET Communication MCQ )
(a) Noise in the system
(b) Distortion in the system
(c) Both noise and distortion
(d) Neither noise nor distortion
Option c – Both noise and distortion
At the transmitting end, a transducer is used to convert:
(a) Electrical signals into sound
(b) Sound signals into electrical signals
(c) Electrical signals into magnetic signals
(d) Sound signals into magnetic signals
Option b – Sound signals into electrical signals
Collation refers to: ( UGC NET Communication MCQ )
(a) Sorting at the transmitter
(b) Decoding at the receiver
(c) Encoding at the transmitter
(d) Storing information at the receiver
Option d – Storing information at the receiver
The purpose of the detector at the receiver is to:
(a) Amplify the signal
(b) Lower the signal’s frequency
(c) Modulate the signal
(d) Retrieve the original signal (demodulation)
Option d – Retrieve the original signal (demodulation)
A loudspeaker functions as a transducer at: ( UGC NET Communication MCQ )
(a) The receiving end
(b) The transmitting end
(c) Both transmitting and receiving ends
(d) Neither transmitting nor receiving ends
Option a – The receiving end
Receiving information involves:
(a) Decoding the signal
(b) Storing the signal
(c) Understanding the signal
(d) All of the above
Option d – All of the above
The word “channel” refers to: ( UGC NET Communication MCQ )
(a) The amplitude range assigned to a source
(b) The frequency range assigned to a source
(c) The voltage range assigned to a source
(d) All of the above
Option b – The frequency range assigned to a source
The field of communication over large distances is called: ( UGC NET Communication MCQ )
(a) Mass communication
(b) Distant communication
(c) Telecommunication
(d) Trans-communication
Option c – Telecommunication
The part of the transmitted message that carries the actual content is called:
(a) Text
(b) Electrical signal
(c) Bytes
(d) Information
Option d – Information
Ground wave transmission weakens because: ( UGC NET Communication MCQ )
(a) The Earth absorbs part of the wave energy
(b) The waves have very low frequency
(c) The waves carry high energy
(d) The Earth’s surface resists wave propagation
Option d – The Earth’s surface resists wave propagation
Space wave propagation cannot cover long distances because: ( UGC NET Communication MCQ )
(a) The troposphere is not tall enough
(b) The troposphere is too high
(c) The troposphere absorbs the transmitted waves
(d) None of these
Option a – The troposphere is not tall enough
The strongest signal is received when direct and reflected waves 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°
When a radio wave enters an ionized layer: ( UGC NET Communication MCQ )
(a) It bends away from the normal
(b) It bends toward the normal
(c) It continues in a straight line
(d) None of these
Option a – It bends away from the normal
A wave formed when an audible electromagnetic wave is combined with another is called:
(a) Carrier wave
(b) High-frequency wave
(c) Modulating wave
(d) Modulated wave
Option d – Modulated wave
The Earth’s atmosphere allows the passage of: ( UGC NET Communication MCQ )
(a) Only visible light
(b) Only X-rays
(c) Only gamma rays
(d) Visible light and microwaves
Option d – Visible light and microwaves
Ground wave communication works best for: ( UGC NET Communication MCQ )
(a) Low-frequency radio waves over short distances
(b) High-frequency radio waves over short distances
(c) High-frequency radio waves over long distances
(d) Low-frequency radio waves over short distances
Option a – Low-frequency radio waves over short distances
We covered all the UGC net communication mcq above in this post for free so that you can practice well for the exam.
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