NCERT MCQ CLASS-12 CHAPTER-15 | PHYSICS NCERT MCQ | COMMUNICATION SYSTEM | EDUGROWN

In This Post we are  providing Chapter-15 Communication System NCERT MCQ for Class 12 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON COMMUNICATION SYSTEM

Question 1.
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

Answer: (a) Leonov 1965

Question 2.
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

Answer: (d) remote sensing

Question 3.
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

Answer: (c) 3 × 10⁸ ms^-1

Question 4.
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

Answer: (b) 20 Hz to 20 kHz

Question 5.
The wavelength of a wave of frequency 10 kHz is:
(a) 30 m
(b) 300 m
(c) 30 km
(d) 300 km

Answer: (c) 30 km

Question 6.
The area served by an antenna of height 100 m is:
(a) 10⁹m²
(b) 4 × 10⁹ m²
(c) 6 × 10⁹m²
(d) 8 × 10¹⁰m²

Answer: (b) 4 × 10⁹ m²

Question 7.
Which of the following is not transducer?
(a) Loudspeaker
(b) Amplifier
(c) Microphone
(d) All

Answer: (b) Amplifier

Question 8.
The space waves which are affected seriously by atmospheric conditions are:
(a) MF
(b) HUF
(c) VHF
(d) UHF

Answer: (d) UHF

Question 9.
An antenna is:
(a) Inductive
(b) Capacitive
(c) Resistive
(d) A transformer

Answer: (a) Inductive

Question 10.
Broadcasting antenna are generally:
(a) Omni directional type
(b) Vertical type
(c) Horizontal type
(d) None

Answer: (b) Vertical type

Question 11.
The modulation index in amplitude modulation is:
(a) Always zero
(b) Between 0 and 1
(c) Between 1 and ∞
(d) None of these

Answer: (c) Between 1 and ∞

Question 12.
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)

Answer: (a) digital signal

Question 13.
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: (a) Neil Armstrong, 1969

Question 14.
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: (a) sound signals into electrical signals

Question 15.
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: (a) electrical signals into sound signals

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