NEET Physics Communication System MCQs

    Prepare for NEET Physics Communication System with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to understand signal transmission and reception.

    NEET Questions / Physics / Communication System

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    Communication Systems
    1.

    A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a distance of 200 km. Considering the surface wave propagation, what is the approximate height of the transmitting antenna required for efficient communication if the earth's radius is 6400 km?

    A

    96 m

    B

    192 m

    C

    384 m

    D

    768 m

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Communication Systems, Space Wave Propagation, Surface Wave Propagation, Antenna Height
    2.

    A satellite communication link operates at a frequency of 6 GHz. The transmitting and receiving antennas have gains of 40 dB and 30 dB, respectively. The distance between the satellite and the receiver is 40,000 km. If the transmitter power is 1 kW, calculate the received power, assuming free space propagation. (Take the speed of light as 3imes1083 imes 10^8 m/s)

    A

    25 pW

    B

    2.5 pW

    C

    250 pW

    D

    0.25 pW

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Communication Systems, Satellite Communication, Friis Transmission Equation
    3.

    Calculate the phase velocity of electromagnetic wave having electron density and frequency of D-layer, N=400 electron ccβˆ’1,v=200 kHzc{c^{ - 1}},v = 200\,kHz

    A

    2.985 x 10^8 m/s

    B

    3.015 x 10^8 m/s

    C

    3.15 x 10^8 m/s

    D

    2.85 x 10^8 m/s

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Electromagnetic waves, Phase velocity, Plasma frequency, Electron density
    4.

    If an electromagnetic wave is transmitted to the height equal to 150 km with maximum frequency 300 kHz and critical frequency 100 kHz, the skip distance is

    A

    426 km

    B

    636 km

    C

    824 km

    D

    849 km

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :electromagnetic wave propagation, skip distance, critical frequency, maximum usable frequency
    5.

    Consider an optical communication system operating at λ∼800nm\lambda \sim 800nm. Suppose, only 1% of the optical source frequency is the available channel bandwidth for optical communication. How many channels can be accommodated for transmitting audio signals requiring a bandwidth of 8 kHz

    A

    4.8imes1084.8 imes {10^8}

    B

    48

    C

    6.2imes1086.2 imes {10^8}

    D

    4.8imes1054.8 imes {10^5}

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Electromagnetic waves, Frequency, Bandwidth, Channel capacity
    6.

    The antenna current of an AM transmitter is 8 A when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by single sine wave. Find the percentage modulation.

    A

    60.10%

    B

    70.10%

    C

    80.10%

    D

    50.10%

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :AM modulation, antenna current, modulation index
    7.

    A TV tower has a height 150 m. What is the total population covered by the TV tower, if the population density around the TV tower is 103β€…β€Škmβˆ’2?{10^3}{\rm{\;k}}{{\rm{m}}^{ - 2}}? Radius of the earth is 6.4imes106β€…β€Šm.6.4 imes {10^6}\;{\rm{m}}.

    A

    60.288 lakhs

    B

    40.192 lakhs

    C

    100 lakhs

    D

    20.228 lakhs

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Geometry, Area of a spherical cap, Population density
    8.

    A TV tower has a height 150 m. What is the total population covered by the TV tower, if the population density around the TV tower is 103β€…β€Škmβˆ’2?{10^3}{\rm{\;k}}{{\rm{m}}^{ - 2}}? Radius of the earth is 6.4imes106β€…β€Šm.6.4 imes {10^6}\;{\rm{m}}.

    A

    6.062 * 10^6

    B

    1.212 * 10^7

    C

    3.031 * 10^6

    D

    1.515 * 10^6

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Geometry, Area of a spherical cap, Population Density
    9.

    Two electrons are moving in opposite direction with speeds 0.8 c and 0.4 c, where c the speed of light in vacuum. Then the relative speed is about

    A

    0.588c

    B

    1.2c

    C

    0.4c

    D

    0.912c

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Special Relativity, Velocity Addition
    10.

    Two electrons are moving in opposite direction with speeds 0.8 c and 0.4 c, where c the speed of light in vacuum. Then the relative speed is about

    A

    0.4 c

    B

    0.8 c

    C

    0.9 c

    D

    1.2 c

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Special Relativity, Velocity Addition

    Showing 1 to 10 of 25 entries

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