NCERT MCQ CLASS – 12 | SOCIOLOGY PART B | CHAPTER- 7 | MASS MEDIA AND COMMUNICATIONS | EDUGROWN |

In This Post we are  providing  CHAPTER 7 MASS MEDIA AND COMMUNICATIONSNCERT MCQ for Class 12 SOCIOLOGY PART B 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 MASS MEDIA AND COMMUNICATIONS

Question 1.
Modulation index of an AM signal:
(a) depends upon the peak amplitude of the modulating signal and the carrier.
(b) depends upon the peak amplitude of modulating signal.
(c) is a function of carrier frequency.
(d) None of these.

Answer: (a) depends upon the peak amplitude of the modulating signal and the carrier.

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Question 2.
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.

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Question 3.
In modulation process, radio frequency wave is termed as
(a) modulating wave
(b) modulated wave
(c) carrier wave
(d) none

Answer: (c) carrier wave

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Question 4.
Digital signals:
(a) represent values as discrete steps.
(b) utilise binary code system.
(c) do not provide a continuous set of values.
(d) All of these.

Answer: (d) All of these.

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Question 5.
Modulation index in an FM signal:
(a) Varies directly as the modulating frequency.
(b) Varies directly as frequency deviation and inversely as the modulating frequency.
(c) varies inversely as the frequency deviation. ‘
(d) None of these.

Answer: (b) Varies directly as frequency deviation and inversely as the modulating frequency.

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Question 6.
The most commonly employed analog modulation technique in satellite communication is the
(a) amplitude modulation
(b) frequency modulation
(c) phase modulation
(d) All of the above

Answer: (b) frequency modulation

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Question 7.
Satellite transponders
(a) use a high frequency for reception and a lower frequency for retransmission of information to and from earth
(b) use a lower frequency for reception and a higher frequency for retransmission of information to and from earth.
(c) Use a single frequency for reception and retransmission of information to and from earth.
(d) none of the above.

Answer: (a) use a high frequency for reception and a lower frequency for retransmission of information to and from earth

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Question 8.
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

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Question 9.
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

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Question 10.
High frequency waves are
(a) reflected by E layer.
(b) absorbed by F layer.
(c) affected by the solar cycle.
(d) capable of use for long-distance transmission.

Answer: (a) and (c).

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Question 11.
Which of the following is invariably found on all communication satellites as a payload
(a) transponder
(b) photographic camera
(c) optical telescope
(d) None of these

Answer: (a) transponder

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Question 12.
An antenna is
(a) capacitive
(b) reactive
(c) inductive above its resonance frequency.
(d) None of these

Answer: (c) inductive above its resonance frequency.

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Question 13.
Microwave link repeaters are typically 50 km apart,
(a) because of atmospheric attenuation.
(b) because of the earth’s curvature.
(c) to ensure that signal voltage may not harm the repeater.
(d) None of these.

Answer: (b) because of the earth’s curvature.

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Question 14.
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

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Question 15.
Audio signals have frequency range.
(a) 20 Hz to 20 kHz
(b) 20 kHz to 20 MHz
(c) 20 MHz to 20 GHz
(d) All of these.

Answer: (a) 20 Hz to 20 kHz

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