Physics Communication System MCQs for NEET

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Questions
1 Loss of signal strength while propagating through the medium is known as ____ .
A Amplification
B Modulation
C Demodulation
D Attenuation

Answer: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

Answer:Range
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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

Answer:a, c and d
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

Answer:kHz
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

Answer:Higher harmonics
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

Answer:Free space
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

Answer:a, b, c and d
11 The number of harmonics comprising a rectangular signal is ___
A 100
B infinity
C 200
D 1000

Answer:infinity
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

Answer:Decreases
13 Which of the following does not use the space wave mode of propagation?
A Television
B Microwave links
C Telephone
D Satellite

Answer:Telephone
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

Answer: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

Answer:Second harmonic
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

Answer:Satellite
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

Answer:Channel

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