JEE Main Communication Systems Practice Questions With Solutions

JEE Main Communication Systems Practice Questions with Solutions

The JEE Main Communication Systems Practice Test is a set of questions from the communication systems chapter, beneficial for students to practice and acquire knowledge of this topic. It is a key chapter of Physics and is comparatively easy to learn. This chapter deals with the exchange of communication between two medium through signals. The JEE Main Communication Systems Practice Questions with Solutions are important for students as they contain a variety of questions from this chapter, along with their solutions. You can expect at least 1 question from this chapter in the physics section of the JEE Main entrance exam. The important topics from this chapter are Types of Communication Systems, Elements of Communication Systems, Signal Transmission, Modulation and Demodulation, Network Concepts, Bandwidth and Noise, and Important Formulas. To answer questions from this chapter, students must be be aware of the key concepts thoroughly. Practice tests will contain questions from all the important topics of the communication system.

The JEE Main Communication Systems Practice Questions with Solutions are a reliable practice test series to increase the students’ proficiency in this chapter. There are around 20 questions from the communication systems chapter available in these practice tests. Practising at least 1 to 2 practice tests a month from this chapter will be beneficial for students preparing for the JEE Main entrance exam. From this chapter, they will get questions in the form of multiple choice types and numericals based types. Practising questions from communication systems regularly will increase the students’ ability to solve calculations at a faster pace. Furthermore, it will boost the chances of the students’ success in the JEE Main entrance exam.

JEE Main Physics Communication Systems Practice Questions

Mathematics Chemistry

Question 1.

The height of transmitting antenna is

180 m

and the height of the receiving antenna is

245 m

. The maximum distance between them for satisfactory communication in line of sight will be :

(given

R = 6400 km)

A

104 km

B

56 km

C

48 km

D

96 km

Question 2.

To radiate EM signal of wavelength $λ$ with high efficiency, the antennas should have a minimum size equal to:

A

\frac{λ}{2}

B

λ

C

\frac{λ}{4}

D

2 λ

Question 3.

Match List - I with List - II

	List - I (Layer of atmosphere)		List - II (Approximate height over earth's surface)
(A)	$F_{1}$ - Layer	(I)	10 km
(B)	$D$ - Layer	(II)	170 - 190 km
(C)	Troposphere	(III)	100 km
(D)	$E$ - Layer	(IV)	65 - 75 km

Choose the correct answer from the options given below:

A

A - II, B - IV, C - III, D - I

B

A - II, B-I, C - IV, D - III

C

A - II, B - IV, C - I, D - III

D

A - III, B - IV, C - I, D - II

Question 4.

The amplitude of $15 \sin (1000 π t)$ is modulated by $10 \sin (4 π t)$ signal. The amplitude modulated signal contains frequencies of

A. $500 Hz$

B. $2 Hz$

C. $250 Hz$

D. $498 Hz$

E. $502 Hz$

Choose the correct answer from the options given below:

A

A and C only

B

A and B only

C

A and D only

D

A, D and E only

Question 5.

In satellite communication, the uplink frequency band used is :

A

3.7 - 4.2 GHz

B

5.925 - 6.425 GHz

C

76 - 88 MHz

D

420 - 890 MHz

Question 6.

A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the signal in line of sight at $4 km$ distance from it is $x \times 10^{- 2} m$ . The value of $x$ is __________.

(Let, radius of earth $R = 6400 km$ )

A

1.25

B

125

C

1250

D

12.5

Question 7.

A message signal of frequency $3 kHz$ is used to modulate a carrier signal of frequency $1.5 MHz$ . The bandwidth of the amplitude modulated wave is

A

6 MHz

B

6 kHz

C

3 MHz

D

3 kHz

Question 8.

A carrier wave of amplitude 15 V is modulated by a sinusoidal base band signal of magnitude 3 V. The ratio of maximum amplitude to minimum amplitude in an amplitude modulated wave is

A

1

B

5

C

2

D

\frac{3}{2}

Question 9.

The power radiated from a linear antenna of length $l$ is proportional to

(Given, $λ =$ Wavelength of wave):

A

{(\frac{l}{λ})}^{2}

B

\frac{l}{λ^{2}}

C

\frac{l^{2}}{λ}

D

\frac{l}{λ}

Question 10.

A TV transmitting antenna is $98 m$ high and the receiving antenna is at the ground level. If the radius of the earth is $6400 km$ , the surface area covered by the transmitting antenna is approximately:

A

4868 {km}^{2}

B

1240 {km}^{2}

C

3942 {km}^{2}

D

1549 {km}^{2}

Question 1.

For an amplitude modulated wave the minimum amplitude is $3 V$ , while the modulation index is $60 %$ . The maximum amplitude of the modulated wave is:

A

5 V

B

12 V

C

10 V

D

15 V

Question 2.

By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by $21 %$ ?

A

12%

B

15%

C

10%

D

14%

Question 3.

In an amplitude modulation, a modulating signal having amplitude of X Volt is superimposed with a carrier signal of amplitude Y Volt in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude 2Y Volt. The ratio of modulation index in the two cases respectively will be :

A

2 : 1

B

1 : 1

C

4 : 1

D

1 : 2

Question 4.

Which of the following frequencies does not belong to FM broadcast ?

A

106 MHz

B

89 MHz

C

64 MHz

D

99 MHz

Question 5.

Given below are two statements :

Statement I : For transmitting a signal, size of antenna ( $l$ ) should be comparable to wavelength of signal (at least $l = \frac{λ}{4}$ in dimension)

Statement II: In amplitude modulation, amplitude of carrier wave remains constant (unchanged).

In the light of the above statements, choose the most appropriate answer from the options given below

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are correct

C

Both Statement I and Statement II are incorrect

D

Statement I is correct but Statement II is incorrect

Question 6.

The amplitude of $15 \sin (1000 π t)$ is modulated by $10 \sin (4 π t)$ signal. The amplitude modulated signal contains frequency (ies) of

A. $500 Hz$

B. $2 Hz$

C. $250 Hz$

D. $498 Hz$

E. $502 Hz$

Choose the correct answer from the options given below:

A

B only

B

A only

C

A, D and E only

D

A and B only

Question 7.

Match List I with List II:

List I	List II
A. Attenuation	I. Combination of a receiver and transmitter.
B. Transducer	II. process of retrieval of information from the carrier wave at receiver
C. Demodulation	III. converts one form of energy into another
D. quad Repeater	IV. Loss of strength of a signal while propagating through a medium.

Choose the correct answer from the options given below:

A

A-I, B-II, C-III, D-IV

B

A-IV, B-III, C-I, D-II

C

A-IV, B-III, C-II, D-I

D

A-II, B-III, C-IV, D-I

Question 8.

A sinusoidal carrier voltage is amplitude modulated. The resultant amplitude modulated wave has maximum and minimum amplitude of $120 V$ and $80 V$ respectively. The amplitude of each sideband is :

A

15 V

B

20 V

C

5 V

D

10 V

Question 9.

The modulation index for an A.M. wave having maximum and minimum peak-to-peak voltages of 14 mV and 6 mV respectively is-

A

0.4

B

0.6

C

1.4

D

0.2

Question 10.

If the height of transmitting and receiving antennas are 80 m each, the maximum line of sight distance will be:

Given : Earth's radius $= 6.4 \times 10^{6}$ m

A

28 km

B

64 km

C

32 km

D

36 km

JEE Main Communication Systems Practice Questions With Solutions

JEE Main Communication Systems Practice Questions with Solutions

JEE Main Physics Communication Systems Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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