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Free download in PDF Class 12 Physics Chapter 15 Communication Systems Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
Loss of signal strength while propagating through the medium is known as ____ .
[A]
Amplification
[B]
Modulation
[C]
Demodulation
[D]
Attenuation
(2)
The largest distance between a source and a destination up to which the signal is received with sufficient strength is called the ____
[A]
Mean free path
[B]
Bandwidth
[C]
Skip distance
[D]
Range
(3)
In an AM modulator, the centre frequency of the band pass filter is ____.
[A]
The carrier frequency
[B]
The message frequency
[C]
Sum of message and carrier frequencies
[D]
Difference between the message and carrier frequencies
Answer: The carrier frequency
(4)
Which Indian Physicist made significant contribution to the field of radio transmission ____.
[A]
Sir C.V Raman
[B]
S. Chandrashekar
[C]
Jagdish Chandra Bose
[D]
M. S Swaminathan
Answer: Jagdish Chandra Bose
(5)
A repeater is a combination of a. Transmitter b. Oscillator c. Amplifier d. Receiver e. Transducer
[A]
a, b and d
[B]
a, c and d
[C]
a, b and c
[D]
a, d and e
(6)
A digital signal which is a rectangular waveform is more or less recovered
[A]
if the bandwidth is very small to accommodate a few harmonics
[B]
if the bandwidth is very large to accommodate a few harmonics.
[C]
independent of the bandwidth
[D]
Either (a) or (c) depending upon the signal waveform
Answer: if the bandwidth is very large to accommodate a few harmonics.
(7)
The unit of bandwidth is ____
[A]
kHz
[B]
km
[C]
kN
[D]
Second
(8)
With respect to digital signals, distortion in the received waves are due to removal of ____
[A]
First harmonic
[B]
Fundamental frequency
[C]
Higher harmonics
[D]
Second Harmonic
(9)
Which of the following is the channel used in Radio communication ____
[A]
Free space
[B]
Twisted pair cables
[C]
Coaxial cable
[D]
Fiber optic cable
(10)
Communication signals can be transmitted via ____. a. Air b. Optical fiber c. Coaxial cables d. Vaccum
[A]
a and c
[B]
a,b and c
[C]
a, b and d
[D]
a, b, c and d
(11)
The number of harmonics comprising a rectangular signal is ___
[A]
100
[B]
infinity
[C]
200
[D]
1000
(12)
As the Electromagnetic waves travel away from the transmitter, the strength of the waves ____ .
[A]
Increases
[B]
Decreases
[C]
Remains the same
[D]
Increases and the remains the same
(13)
Which of the following does not use the space wave mode of propagation?
[A]
Television
[B]
Microwave links
[C]
Telephone
[D]
Satellite
(14)
The message signal takes which of the following path in a communication system____.
[A]
Transmitter → Transducer → Channel → Receiver
[B]
Transducer → Transmitter → Receiver
[C]
Transducer → Transmitter → Channel → Receiver
[D]
Channel → Transducer → Transmitter → Receiver
Answer: Transducer → Transmitter → Channel → Receiver
(15)
Which of the following is not a transducer? a. Loudspeaker b. Receiver c. Transmitter d. Microphone
[A]
b, c and d
[B]
a and d
[C]
b and c
[D]
a, b and c
(16)
To reproduce the rectangular wave shape of digital signals practically, the harmonic that can be neglected for limiting the bandwidth are ____
[A]
Fundamental
[B]
First harmonic
[C]
Second harmonic
[D]
higher order harmonics
(17)
The three basic elements of any communication system are ___.
[A]
Transducer, Transmitter, Receiver
[B]
Transmitter, Channel, Receiver
[C]
Transducer, Channel, Receiver
[D]
Transducer, Channel, Transmitter
Answer: Transmitter, Channel, Receiver
(18)
The frequency band 3.7 - 4.2 GHz corresponds to which of the following wireless communication system
[A]
Satellite
[B]
Optical fiber
[C]
FM
[D]
TV
(19)
Which of the following statements is wrong?
[A]
The attenuation of surface waves increases very rapidly with increase in frequency.
[B]
Signals of frequency range 550 kHz - 1500 kHz can be transmitted as ground waves.
[C]
Satellite communication is used for the frequencies above 30 MHz
[D]
The range of frequency for Sky wave propagation is a few MHz to 30 - 40 MHz
Answer: Satellite communication is used for the frequencies above 30 MHz
(20)
Fibre optic cable, co-axial cable, twisted pair cables are examples of ____.
[A]
Transmitter
[B]
Receiver
[C]
Channel
[D]
Transducer
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