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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)
Which of the following is not transducer?
[A]
Loudspeaker
[B]
Amplifier
[C]
Microphone
[D]
All
(2)
The length of a half wave dipole at 30 mega-hertz is:
[A]
5 m
[B]
10 m
[C]
25 m
[D]
80 m
(3)
Name the man who was first to place his foot on the moon and in which year:
[A]
Neil Armstrong, 1969
[B]
James Van A lien, 1971
[C]
Leonov, 1965
[D]
None of these
Answer: Neil Armstrong, 1969
(4)
A loudspeaker converts:
[A]
electrical signals into sound signals
[B]
sound signals into electrical signals
[C]
both (a) and (b)
[D]
neither (a) nor (b)
Answer: electrical signals into sound signals
(5)
In space communication, the sound waves can be sent from one place to another:
[A]
through space
[B]
through wires
[C]
by superimposing it on undamped electro-magnetic waves
[D]
by superimposing it on damped electro-magnetic waves
Answer: by superimposing it on undamped electro-magnetic waves
(6)
A microphone converts:
[A]
sound signals into electrical signals
[B]
electrical signals into sound signals
[C]
both (a) and (b)
[D]
Neither (a) nor (b)
Answer: sound signals into electrical signals
(7)
The modulation index in amplitude modulation is:
[A]
Always zero
[B]
Between 0 and 1
[C]
Between 1 and ∞
[D]
None of these
(8)
The space waves which are affected seriously by atmospheric conditions are:
[A]
MF
[B]
HUF
[C]
VHF
[D]
UHF
(9)
The area served by an antenna of height 100 m is:
[A]
109m²
[B]
4 × 109 m²
[C]
6 × 109m²
[D]
8 × 1010m²
(10)
Broadcasting antenna are generally:
[A]
Ommi directional type
[B]
Vertical type
[C]
Horizontal type
[D]
None
(11)
The audio frequencies range from:
[A]
20 Hz to 20.000 kHz
[B]
20 Hz to 20 kHz
[C]
20 kHz to 20.000 kHz
[D]
None of these
(12)
Who undertook the first space walk and in which year?
[A]
Leonov 1965
[B]
Neil Armstrong, 1969
[C]
Rakesh Sharma. 1998
[D]
None of these
(13)
An antenna is:
[A]
Inductive
[B]
Capacitive
[C]
Resistive
[D]
A transformer
(14)
The sound produced by a tuning fork is a sort of:
[A]
analog signal
[B]
digital signal
[C]
both (a) and (b)
[D]
neither (a) nor (b)
(15)
The wavelength of a wave of frequency 10 kHz is:
[A]
30 m
[B]
300 m
[C]
30 km
[D]
300 km
(16)
The term used “to collect the information about an object and a place without physical contact” is called :
[A]
modulation
[B]
communication
[C]
amplification
[D]
remote sensing
(17)
The velocity of electromagnetic wave is:
[A]
3 × 105 ms-1
[B]
3 × 106 ms-1
[C]
3 × 108 ms-1
[D]
3 × 1010 ms-1
(18)
The output of a digital computer is an example of:
[A]
digital signal
[B]
analog signal
[C]
both (a) and (b)
[D]
neither (a) nor (b)
(19)
The output of a digital computer is an example of:
[A]
digital signal
[B]
analog signal
[C]
both (a) and (b) above
[D]
neither (a) nor (b)
(20)
AM is used for broadcasting because:
[A]
it is more noise immune than other modulation system
[B]
it requires less transmitting power compare with other systems
[C]
its use avoids receiver complexity
[D]
No other modulation system can provide the necessary bandwidth faithful transmission
Answer: its use avoids receiver complexity
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