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NEET • PHYSICS • COMMUNICATION SYSTEMS

Communication systems practice · Mixed difficulty

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31 Hard

31 of 44

Application +4 | -1

An amplitude modulated wave is modulated to 50%. What is the saving in power if carrier as well as one of the side bands are suppressed

View answer and explanation

Correct option: C

0.944

Option C (0.944) is correct because it represents the calculated power saving when the carrier and one sideband are suppressed in an AM wave.

32 Easy

32 of 44

Remembering +4 | -1

Major parts of a communication system are

View answer and explanation

Correct option: D

Transmitter, receiver and communication channel

Option D, Transmitter, receiver and communication channel, is correct because these are the three essential components for any communication system to function.

33 Easy

33 of 44

Understanding +4 | -1

A laser beam is used for carrying out surgery because it

View answer and explanation

Correct option: D

Can be sharply focused

The correct answer is D (Can be sharply focused) because the ability to focus a laser beam to a small spot allows for precise cutting or ablation of tissue during surgery.

34 Medium

34 of 44

Understanding +4 | -1

In satellite communication, the communication satellite;

View answer and explanation

Correct option: C

Receives the coming modulated microwave signal, amplifies it and returns it to earth at a different frequency

Option C (Receives the coming modulated microwave signal, amplifies it and returns it to earth at a different frequency) is correct because a communication satellite acts as a repeater, amplifying and retransmitting the signal at a different frequency to avoid interference.

35 Medium

35 of 44

Application +4 | -1

The height of a TV antenna is 200 m. The population density is

4000\;\mathrm{k}{\mathrm{m}^{ - 2}}

. Find the population benefited

View answer and explanation

Correct option: B

3.2 \times {10^7}

Option B (

3.2 \times {10^7}

) is correct because the population benefited is calculated based on the coverage area and population density.

36 Medium

36 of 44

Application +4 | -1

Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per second on the average at a target irradiated by this beam is

View answer and explanation

Correct option: B

3 \times {10^{16}}

Option B (

3 \times {10^{16}}

) is correct because the number of photons is calculated by dividing the power by the energy of a single photon.

37 Medium

37 of 44

Remembering +4 | -1

A laser device produces amplification in the

View answer and explanation

Correct option: B

Ultraviolet or visible region

Option B, Ultraviolet or visible region, is correct because lasers can be designed to produce amplification (light emission) in these regions of the electromagnetic spectrum.

38 Medium

38 of 44

Remembering +4 | -1

The characteristic impedance

\left( {{Z_0}} \right)

parallel line wire is

View answer and explanation

Correct option: A

{Z_0} = \frac{{276}}{{\sqrt k }}\log \frac{{2s}}{d}

Option A is correct because it represents the standard formula for the characteristic impedance of a parallel line wire.

39 Medium

39 of 44

Analyzing +4 | -1

A modulated signal

\mathrm{C}_{\mathrm{m}}(\mathrm{t})

has the form

\mathrm{C}_{\mathrm{m}}(\mathrm{t})=30 \sin 300 \pi \mathrm{t}+10(\cos 200 \pi \mathrm{t}-\cos 400 \pi \mathrm{t})

. The carrier frequency

\mathrm{f_c}

, the modulating frequency (message frequency)

\mathrm{f}_\omega

and the modulation index

\mu

are respectively given by:

View answer and explanation

Correct option: B

\mathrm{f}_{\mathrm{c}}=150 \mathrm{~Hz} ; \mathrm{f}_{\mathrm{w}}=50 \mathrm{~Hz} ; \mu=\frac{2}{3}

Option B is correct because the carrier frequency, modulating frequency, and modulation index are calculated from the given modulated signal equation.

40 Medium

40 of 44

Remembering +4 | -1

The difference in the refractive index of the fiber core and fiber cladding in step-index fibers is typically

View answer and explanation

Correct option: B

0.01

Option B, 0.01, is the typical difference in refractive index between the core and cladding of a step-index fiber.

41 Medium

41 of 44

Analyzing +4 | -1

Assertion (A) Audio signal of frequency

10\, {kHz}

cannot be transmitted over long distance without modulation.

Reason (R) Length of the antenna required

\lambda / 4

, should have practical value.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and Reason is correct explanation of Assertion

Option A is correct because both the assertion and the reason are true, and the reason correctly explains the assertion.

42 Easy

42 of 44

Remembering +4 | -1

The mobile telephones operate typically in the range of

View answer and explanation

Correct option: D

800-950 MHz

Option D, 800-950 MHz, is the typical frequency range in which mobile telephones operate.

43 Easy

43 of 44

Application +4 | -1

At a particular station, the TV transmission tower has a height of

100 \mathrm{~m}

. To triple its coverage range, height of the tower should be increased to

View answer and explanation

Correct option: D

900 \mathrm{~m}

Option D (900 m) is correct because the coverage range is proportional to the square root of the height of the tower.

44 Easy

44 of 44

Understanding +4 | -1

Which one of the following is a full duplex transmission system?

View answer and explanation

Correct option: C

Telephone

Option C (Telephone) is a full-duplex system because it allows simultaneous two-way communication between two parties.

Revision notes and key takeaways

Review COMMUNICATION SYSTEMS in your textbook or class notes, then use this set to check your understanding.

Showing 31-44 of 44 questions

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Communication systems practice · Mixed difficulty

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