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Test: Communication Systems


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30 Questions MCQ Test Physics Class 12 | Test: Communication Systems

Test: Communication Systems for NEET 2022 is part of Physics Class 12 preparation. The Test: Communication Systems questions and answers have been prepared according to the NEET exam syllabus.The Test: Communication Systems MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Communication Systems below.
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Test: Communication Systems - Question 1

Electronic communication refers to

Detailed Solution for Test: Communication Systems - Question 1

Explanation:When information are sent from one point  to the other it has to be converted into electrical signal using transducer.The receiver receives it in its original from using receiver.Such from of communication is called electronic communication.

Test: Communication Systems - Question 2

FM Radio set used in cars is

Detailed Solution for Test: Communication Systems - Question 2

Explanation: Radio means sending energy with waves. In other words, it's a method of transmitting electrical energy from one place to another without using any kind of direct, wired connection. That's why it's often called wireless. The equipment that sends out a radio wave is known as a transmitter; the radio wave sent by a transmitter whizzes through the air—maybe from one side of the world to the other—and completes its journey when it reaches a second piece of equipment called a receiver((here a radio).

Test: Communication Systems - Question 3

For a signal to be reproduced without distortion

Detailed Solution for Test: Communication Systems - Question 3

Most vibrating objects have more than one resonant frequency and those used in musical instruments typically vibrate at harmonics of the fundamental. A harmonic is defined as an integer (whole number) multiple of the fundamental frequency.

Test: Communication Systems - Question 4

A woofer should be fed from the input through a

Detailed Solution for Test: Communication Systems - Question 4

Woofer is a low frequency loud speaker covering the range 16 Hz to 500 Hz.

Test: Communication Systems - Question 5

AM detection is

Detailed Solution for Test: Communication Systems - Question 5

AM Detector. The detection of AM radio signals is a diode application. The modulated AM carrier wave is received by the antenna of the radio receiver and is rectified by the action of a detector diode. The signal frequency which modulates it is much lower, 0.02 to 5 kHz, and it can pass through the filter.
 

Test: Communication Systems - Question 6

The three elements of a generalized communication system are

Detailed Solution for Test: Communication Systems - Question 6

Explanation:In communication the Transmitter helps in transmitting the signal through communication channel which acts as a physical path that connects transmitter to a receiver.And the receiver receives the transmitted signal and converts those signals in their original form.

Test: Communication Systems - Question 7

TV set used in a typical house is

Detailed Solution for Test: Communication Systems - Question 7

Explanation: The equipment that sends out a radio wave is known as a transmitter; the radio wave sent by a transmitter whizzes through the air—maybe from one side of the world to the other—and completes its journey when it reaches a second piece of equipment called a receiver.A television antenna, or TV aerial, is an antenna specifically designed for the reception of over-the-air broadcast television seignal, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries..

Test: Communication Systems - Question 8

Audio signals have a maximum bandwidth of about

Detailed Solution for Test: Communication Systems - Question 8

22050Hz (often lazily called "22 kHz") has been a reasonably popular sample rate for low bit rate MP3s such as 64 kbps in years past. Audio quality is significantly affected, with higher frequency content missing. With the general rise in the availability of large file storage space and faster data links, 22 kHz is now of more limited use.
1.For speech recording where perceived quality is unimportant, but clarity must be maintained.
2.AM radio
3.Formerly used to squeeze much mp3 music onto floppy disk & very small mp3 players.
 

Test: Communication Systems - Question 9

Pulse is specified by pulse height or the peak voltage, the pulse duration and pulse to pulse spacing. In pulse amplitude modulation (PAM) what changes with base band signal is

Detailed Solution for Test: Communication Systems - Question 9

Pulseis specified by pulse height or the peak voltage, the pulse duration and pulse to pulse spacing. In pulse amplitude modulation (PAM) what changes with base band signal is pulse height or the peak voltage.
Hence the correct answer is option D.

Test: Communication Systems - Question 10

A rectifier and an envelope detector for AM uses

Test: Communication Systems - Question 11

Electronic communication is not possible if

Detailed Solution for Test: Communication Systems - Question 11

Explanation:As the information or message is transmitted from the source to the receiver ,it is first converted into electrical signal which is then transmiited through the communication medium.Hence in electrical communication it is must to convert raw message or information into electrical signal.Else the electronic messages will not be transmitted.

Test: Communication Systems - Question 12

For attenuation of high frequencies we should use

Detailed Solution for Test: Communication Systems - Question 12

Since Xc for high frequencies is low, the high frequencies are shunted to ground and are not transmitted.

Test: Communication Systems - Question 13

Coaxial cables have a bandwidth in the range of

Test: Communication Systems - Question 14

To reduce the distortion in amplitude modulation, modulation index is kept

Detailed Solution for Test: Communication Systems - Question 14

In Amplitude modulation, it is defined as the ratio of the amplitude of modulating signal to that of the carrier signal. Its value is kept less than 1 to avoid overmodulation which leads to distortions in the modulated signal and makes it very hard to demodulate and extract the modulating signal.

Test: Communication Systems - Question 15

Frequencies in the UHF range normally propagate by means of:

Test: Communication Systems - Question 16

Which of these is an example of point to point communication?

Detailed Solution for Test: Communication Systems - Question 16

Explanation:In point to point communication,communication occurs over a link between a single transmitter and receiver.Telephony is an example of it as it needs a link between caller and receiver to transmit the information.This link is provided by various media like cable.

Test: Communication Systems - Question 17

Amplification is the

Detailed Solution for Test: Communication Systems - Question 17

Explanation:It is the process of increasing the amplitude and hence the strength of an elctrical signal by using an electric circuit having atleat on transistor is called amplifier.Amplification is rerquired to compensate for the loss of strenght of a signal during its transmission.The additional energy is otianed from a dc source.The process of amplification is done at a location betwen the sources and the destination where the strength of signal becomes weaker than the required level.

Test: Communication Systems - Question 18

Transmission bandwidth of fiber optic communication can be up to

Test: Communication Systems - Question 19

One method of producing an amplitude modulation is to add the carrier and modulating signal and then

Detailed Solution for Test: Communication Systems - Question 19

a square law device is used, to eliminate the need of generating a carrier at the receiver end as a demodulator. the result of a square law will have the desired component as well as harmonics. To suppress these harmonics, a bandpass filter (sometimes low pass) is used.

Test: Communication Systems - Question 20

A carrier wave of peak voltage 12V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?

Detailed Solution for Test: Communication Systems - Question 20

The peak voltage of the carrier wave is, Ac​=12 V
Modulation index, m=0.75
The peak voltage for the modulating signal is given by:
m= Am​​/Ac
Am​=0.75×12
So, Am​=9 V

Test: Communication Systems - Question 21

Which of these is an example of broadcast communication?

Detailed Solution for Test: Communication Systems - Question 21

Explanation:In broadcast mode of communication a large number of receivers are linked to a single transmiiter.Radio works as receiver which converts the transmiited information/message into the original form of the information.

Test: Communication Systems - Question 22

Range of an electronic communication system

Detailed Solution for Test: Communication Systems - Question 22

Explanation:As the distance between the source and the destination increases the strenght of the transmitted signals become weaker and weaker and the distance where it loses energy to travel any more is range of the signal.

Test: Communication Systems - Question 23

In ground wave propagation the earth

Test: Communication Systems - Question 24

Before transmission the AM produced by a square law device

Detailed Solution for Test: Communication Systems - Question 24


Before transmission the AM produced by a square law device goes through a power amplifier.

Test: Communication Systems - Question 25

Multiplexing is a scheme for transmitting multiple signals at the same time e.g. speeches of ten persons in different rooms on the same channel. How many transmitters will be required in any multiplexing scheme?

Detailed Solution for Test: Communication Systems - Question 25

The transmitter required is only one.because the signal needed to be transmitted is one.

Test: Communication Systems - Question 26

Transducer is a device that

Detailed Solution for Test: Communication Systems - Question 26

Explanation:Any device which converts energy from one form to another is called a transducer.It converts variation in physical quantities such as pressure,dispalcement,force,temprature etc.Like microphone converts sound signal into an electrical signal.

Test: Communication Systems - Question 27

Bandwidth of an electronic communication system

Detailed Solution for Test: Communication Systems - Question 27

Explanation: A range within a band of wavelengths, frequencies, or energies; especially :  a range of radio frequencies which is occupied by a modulated carrier wave, which is assigned to a service, or over which a device can operate.

Test: Communication Systems - Question 28

Ground wave propagation is used for

Test: Communication Systems - Question 29

The range of an AM broadcast depends

Test: Communication Systems - Question 30

In Amplitude modulation if one of the two side bands is removed by a filter is it possible to recover the modulating signal?

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