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Communication System — NEET UG Physics PYQs

56 previous year questions from Communication System with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

56 questionsPhysicsSolutions on every page
1

Assertion : Sky wave signals are used for long distance radio communication. These signals are in general less stable than ground wave signals. Reason : The state of ionosphere var

AIIMS 2019 Solution View → 2

Assertion : Sky wave signals are used for long distance radio communication. These signals are in general less stable than ground wave signals. Reason : The state of ionosphere var

NEET 2019 Solution View → 3

Assertion : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Reason : The state of ionosphere va

AIIMS 2018 Solution View → 4

A ground receiver receives a signal at 5 MHz , transmitted by a ground transmitter at a height of 320 ~m , which is 110 ~km away from it. Then it can communicate through (radius of

AIIMS 2018 Solution View → 5

If the modulation index of an amplitude modulated wave is changed from 0 to 1 , then the transmitted power will be

AIIMS 2018 Solution View → 6

In an amplitude modulated signal the maximum amplitude is 15 volt and minimum amplitude is 5 volt, then amplitude of modulating wave will be

AIIMS 2018 Solution View → 7

A ground receiver receives a signal at 5 MHz , transmitted by a ground transmitter at a height of 320 ~m , which is 110 ~km away from it. Then it can communicate through (radius of

NEET 2018 Solution View → 8

If the modulation index of an amplitude modulated wave is changed from 0 to 1 , then the transmitted power will be

NEET 2018 Solution View → 9

Assertion : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Reason : The state of ionosphere va

NEET 2018 Solution View → 10

In an amplitude modulated signal the maximum amplitude is 15 volt and minimum amplitude is 5 volt, then amplitude of modulating wave will be

NEET 2018 Solution View → 11

Assertion : Electromagnetic waves with frequencies smaller than the critical frequencies of ionosphere cannot be used for communication using sky wave propagation. Reason: The refr

AIIMS 2015 Solution View → 12

Assertion : Electromagnetic waves with frequencies smaller than the critical frequencies of ionosphere cannot be used for communication using sky wave propagation. Reason: The refr

NEET 2015 Solution View → 13

Assertion : Short wave communication over long distance is not possible via ground waves. Reason: The ground waves can bend round the corners of the objects on earth.

AIIMS 2014 Solution View → 14

Assertion : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Reason: The state of ionosphere var

AIIMS 2014 Solution View → 15

Assertion : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Reason: The state of ionosphere var

NEET 2014 Solution View → 16

Assertion : Short wave communication over long distance is not possible via ground waves. Reason: The ground waves can bend round the corners of the objects on earth.

NEET 2014 Solution View → 17

For satellite communication which wave is used ?

AIIMS 2013 Solution View → 18

Assertion : In a communication system based on amplitude modulation the modulation index is kept < 1 . Reason : It ensures minimum distortion of signal.

AIIMS 2013 Solution View → 19

If modulation index is 1 / 2 and power of carrier wave is 2 ~W . Then what will be the total power in modulated wave?

AIIMS 2013 Solution View → 20

Long distance communication between two point on earth is achieved by

AIIMS 2013 Solution View → 21

For satellite communication which wave is used ?

NEET 2013 Solution View → 22

If modulation index is 1 / 2 and power of carrier wave is 2 ~W . Then what will be the total power in modulated wave?

NEET 2013 Solution View → 23

Long distance communication between two point on earth is achieved by

NEET 2013 Solution View → 24

Assertion : In a communication system based on amplitude modulation the modulation index is kept < 1 . Reason : It ensures minimum distortion of signal.

NEET 2013 Solution View → 25

The sound waves after being converted into electrical waves are not transmitted as such because

JIPMER 2012 Solution View → 26

The sound waves after being converted into electrical waves are not transmitted as such because

NEET 2012 Solution View → 27

Voltage of modulating wave of 5 ~V with 10 MHz frequency was superimposed on carrier wave of frequency 20 MHz and voltage 20 ~V then the modulation index is

AIIMS 2011 Solution View → 28

The area covered by a transmitting antenna of height 50 ~m is

AIIMS 2011 Solution View → 29

Assertion : In the transmission of long distance radio signals, short wave band is used. Reason : In shorter wavelength, attenuation is very less.

AIIMS 2011 Solution View → 30

The principle of LASER action involves

JIPMER 2011 Solution View → 31

Voltage of modulating wave of 5 ~V with 10 MHz frequency was superimposed on carrier wave of frequency 20 MHz and voltage 20 ~V then the modulation index is

NEET 2011 Solution View → 32

The area covered by a transmitting antenna of height 50 ~m is

NEET 2011 Solution View → 33

Assertion : In the transmission of long distance radio signals, short wave band is used. Reason : In shorter wavelength, attenuation is very less.

NEET 2011 Solution View → 34

The principle of LASER action involves

NEET 2011 Solution View → 35

Assertion : Communication in UHF/VHF regions can be established by space wave or tropospheric wave. Reason : Communication in UHF/VHF regions is limited to line of sight distance.

AIIMS 2010 Solution View → 36

Assertion : Communication in UHF/VHF regions can be established by space wave or tropospheric wave. Reason : Communication in UHF/VHF regions is limited to line of sight distance.

NEET 2010 Solution View → 37

Assertion : Diode lasers are used as optical sources in optical communication. Reason : Diode lasers consume less energy.

AIIMS 2008 Solution View → 38

What maximum frequency can be reflected from ionosphere?

JIPMER 2008 Solution View → 39

Assertion : Diode lasers are used as optical sources in optical communication. Reason : Diode lasers consume less energy.

NEET 2008 Solution View → 40

What maximum frequency can be reflected from ionosphere?

NEET 2008 Solution View → 41

If the highest modulating frequency of the wave is (5 ~kHz ), the number of stations that can be accomodated in a (150 ~kHz ) bandwidth ?

AIIMS 2007 Solution View → 42

In communication with help of antenna if height is doubled then the range covered which was initially (r ) would become

AIIMS 2007 Solution View → 43

If the highest modulating frequency of the wave is (5 ~kHz ), the number of stations that can be accomodated in a (150 ~kHz ) bandwidth ?

NEET 2007 Solution View → 44

In communication with help of antenna if height is doubled then the range covered which was initially (r ) would become

NEET 2007 Solution View → 45

Assertion : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere are used for communication using sky wave propagation. Reason : The refractive

AIIMS 2006 Solution View → 46

Assertion : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere are used for communication using sky wave propagation. Reason : The refractive

NEET 2006 Solution View → 47

For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere?

AIIMS 2005 Solution View → 48

Assertion : Television signals are received through sky-wave propagation. Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical freq

AIIMS 2005 Solution View → 49

For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere?

NEET 2005 Solution View → 50

Assertion : Television signals are received through sky-wave propagation. Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical freq

NEET 2005 Solution View → 51

The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to

AIIMS 2003 Solution View → 52

In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer having electron density 10¹¹ per m ^3 ?

AIIMS 2003 Solution View → 53

Assertion : Microwave communication is preferred over optical communication. Reason : Microwaves provide large number of channels and bandwidth compared to optical signals.

AIIMS 2003 Solution View → 54

The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to

NEET 2003 Solution View → 55

In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer having electron density 10¹¹ per m ^3 ?

NEET 2003 Solution View → 56

Assertion : Microwave communication is preferred over optical communication. Reason : Microwaves provide large number of channels and bandwidth compared to optical signals.

NEET 2003 Solution View →
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