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JEE • PHYSICS • COMMUNICATION SYSTEMS

Communication systems practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy

1 of 16

Understanding +4 | -1

In space communication, the sound waves can be sent from one place to another

View answer and explanation

Correct option: C

By superimposing it on undamped electromagnetic waves

Option C is correct because sound waves need a medium to travel and can be transmitted in space by superimposing them on undamped electromagnetic waves.

2 Easy

2 of 16

Remembering +4 | -1

The sky wave propagation is suitable for radio-waves of frequency

View answer and explanation

Correct option: C

From 2 MHz to 30 MHz

Option C (From 2 MHz to 30 MHz) is correct because sky wave propagation is most effective for radio waves in the frequency range of 2 MHz to 30 MHz.

3 Easy

3 of 16

Remembering +4 | -1

Depth of modulation

\left( {{m_a}} \right)

in terms of

{{\text{E}}_{{\text{max}}}}\,{\text{and}}\,{{\text{E}}_{{\text{min}}}}

View answer and explanation

Correct option: C

{{\text{m}}_{\text{a}}}{\text{ = }}{{\text{E}}_{{\text{max}}}}{\text{ - }}{{\text{E}}_{{\text{min}}}}{\text{/}}{{\text{E}}_{{\text{max}}}} + {{\text{E}}_{{\text{min}}}}

Option C (

{{\text{m}}_{\text{a}}}{\text{ = }}{{\text{E}}_{{\text{max}}}}{\text{ - }}{{\text{E}}_{{\text{min}}}}{\text{/}}{{\text{E}}_{{\text{max}}}} + {{\text{E}}_{{\text{min}}}}})

is correct because it is the standard formula for calculating the depth of modulation in terms of maximum and minimum amplitudes.

4 Easy

4 of 16

Understanding +4 | -1

The power radiated from antenna of length

l

is proportional to

View answer and explanation

Correct option: D

\sqrt {\frac{l}{\lambda }}

Option A is correct because a couple consists of two equal and opposite forces with different lines of action, resulting in a net torque but no net force.

5 Easy

5 of 16

Remembering +4 | -1

In earth's atmosphere, for E-layer, the virtual height and critical frequency are

View answer and explanation

Correct option: D

110 km and 4 MHz

Option D (110 km and 4 MHz) is correct because the E-layer in Earth's atmosphere typically has a virtual height of around 110 km and a critical frequency of approximately 4 MHz.

6 Easy

6 of 16

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

Option D (Can be sharply focused) is correct because a laser beam can be focused to a small spot, delivering high energy density for surgical applications.

7 Easy

7 of 16

Application +4 | -1

In an FM system a 7 kHz signal modulate 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

View answer and explanation

Correct option: A

7.143

Option A (7.143) is correct because carrier swing is calculated by dividing the frequency deviation by the modulation frequency.

8 Easy

8 of 16

Understanding +4 | -1

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

View answer and explanation

Correct option: C

Telephone

The correct answer is C (Telephone) because a telephone allows for simultaneous two-way communication, which is the definition of full duplex.

9 Easy

9 of 16

Understanding +4 | -1

Which of the following statement is NOT correct?

View answer and explanation

Correct option: C

Electromagnetic waves of frequencies higher than
about 30 MHz cannot penetrate the ionosphere

Option C (Electromagnetic waves of frequencies higher than about 30 MHz cannot penetrate the ionosphere) is correct because electromagnetic waves with frequencies above the critical frequency can penetrate the ionosphere.

10 Easy

10 of 16

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.

11 Easy

11 of 16

Understanding +4 | -1

In the communication systems, AM is used for broadcasting because

View answer and explanation

Correct option: A

Its use avoids receiver complexity

Option A (Its use avoids receiver complexity) is correct because AM receivers are simpler and cheaper to build compared to other modulation techniques like FM.

12 Easy

12 of 16

Application +4 | -1

In an FM system a 7 kHz signal modulate 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

View answer and explanation

Correct option: A

7.143

Option A (7.143) is incorrect. The carrier swing is twice the frequency deviation, so it should be 2*50kHz = 100kHz. The question asks for the carrier swing, not the ratio of frequency deviation to modulation frequency. The correct answer should be 100kHz.

13 Easy

13 of 16

Remembering +4 | -1

The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as

View answer and explanation

Correct option: C

Modulation

Option C (Modulation) is correct because modulation is the process of superimposing a signal frequency onto a carrier wave.

14 Easy

14 of 16

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 correct because mobile phones typically operate within this frequency range to facilitate wireless communication.

15 Easy

15 of 16

Understanding +4 | -1

Through which mode of propagation, the radio waves can be sent from one place to another

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because radio waves can be sent from one place to another using ground wave, sky wave, and space wave propagation.

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16 Easy

16 of 16

Remembering +4 | -1

Modulation is the process of superposing

View answer and explanation

Correct option: A

low frequency audio signal on high frequency waves

Option A (low frequency audio signal on high frequency waves) is correct because modulation involves superimposing a low-frequency audio signal onto a high-frequency carrier wave.

Revision notes and key takeaways

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

Key Takeaways

✓ This set contains 16 single-correct-answer MCQs on COMMUNICATION SYSTEMS.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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