MEDIUM
12th West Bengal Board
IMPORTANT
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The wave relevant to telecommunications are its frequency

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Important Questions on Communication System

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 18
The area to be covered for TV telecast is doubled, then height of the antenna (TV tower) will have to be
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 19
A radar operating at a frequency of 10 GHz and have a power 1 kw. It is located at a mountain top of height 500 m. The maximum distance up to which it can detect objects located on the surface of the earth is:
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 20
Why do we need the carrier wave of high frequency for distant communication? (To transmit audio signal over long distances)
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 21
Which type of modulation is used for television transmission?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 22
The ratio of the amplitude of the carrier wave to that of the side-band in the modulated wave is when an amplitude modulation with modulation index 0.5.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 23
The ground receiver in line-of-sight communication cannot receive direct waves due to 
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 24
In the ionosphere, wave are bent down by 
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 23 - Communication System>EXERCISE 23>Q 25
A signal of peak value 5 V at 10 k Hz is modulated using a carrier wave of peak voltage 10 V and 2 MHz. The side-band frequencies are