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