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Communication Systems Class 12 MCQs Questions with Answers
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
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
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
The space waves which are affected seriously by atmospheric conditions are
(a) MF
(b) HUF
(c) VHF
(d) UHF
Answer: (d) UHF
Broadcasting antenna are generally
(a) Ommi directional type
(b) Vertical type
(c) Horizontal type
(d) None
Answer: (b) Vertical type
In amplitude modulation
(a) the amplitude of the carrier remains constant.
(b) the amplitude of the carrier varies in accordance with the amplitude of the modulating signal.
(c) the amplitude of carrier varies in accordance with the frequency of the modulating signal.
(d) None of these.
Answer: (b) the amplitude of the carrier varies in accordance with the amplitude of the modulating signal
For television transmission, the frequency employed is normally in the range
(a) 30-300 Hz
(b) 30-300 kHz
(c) 30-300 MHz
(d) 30-300 GHz
Answer: (c) 30-300 MHz
Which one of the following can happen to the electromagnetic waves travelling in free space
(a) Reflection
(b) Refraction
(c) absorption
(d) attenuation
Answer: (d) attenuation
An antenna is
(a) capacitive
(b) reactive
(c) inductive above its resonance frequency.
(d) None of these
Answer: (c) inductive above its resonance frequency
Optical communication uses the frequency range of
(a) 109 to 1010 Hz
(b) 105 to 106 Hz
(c) 1014 to 1015 Hz
(d) 1016 to 1017 Hz
Answer: (c) 1014 to 1015 Hz
The numbers of geostationary satellites needed for uninterrupted global coverage is
(a) 3
(b) 4
(c) 2
(d) 1
Answer: (a) 3
Which of the following is not transducer?
(a) Loudspeaker
(b) Amplifier
(c) Microphone
(d) All
Answer: (b) Amplifier
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
The length of a half wave dipole at 30 mega-hertz is
(a) 5 m
(b) 10 m
(c) 25 m
(d) 80 m
Answer: (a) 5 m
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: (c) by superimposing it on undamped electro-magnetic waves
Increase in frequency deviation results into
(a) increase in noise of FM receiver
(b) decrease in noise of AM receiver
(c) increase in noise of Am receiver
(d) decrease in noise of FM receiver
Answer: (b) decrease in noise of AM receiver
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 ∞
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: (c) by superimposing it on undamped electro-magnetic waves
The information bearing signal is called
(a) Base band signal
(b) digital signal
(c) Analog signal
(d) None of these
Answer: (a) Base band signal
In a single reflection from the ionosphere, the sky waves cover a distance on ground not more than
(a) 400 m
(b) 4,000 m
(c) 400 km
(d) 4,000 km
Answer: (d) 4,000 km
Digital signals
(a) deal with all sort of values
(b) can use decimal system
(c) can use binary system
(d) (b) and (c) both
Answer: (d) (b) and (c) both
Communication channel consists of
(a) transmission line only
(b) optical fibre only
(c) free space only
(d) All of the above
Answer: (d) All of the above
Digital signals
(a) represents values as discrete steps
(b) Do not represents values as discrete steps
(c) represent values steps
(d) represent random steps
Answer: (a) represents values as discrete steps
Which is more advantageous?
(a) analog data communication
(b) digital data communication
(c) both (a) and (b) are equally good
(d) depends on the situation
Answer: (b) digital data communication
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
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