1.

    A receiver reconstructs the original message after propagation through the channel.

    A

    May be true

    B

    May be false

    C

    May be true or false

    D

    Is certainly true

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    âš¡ Time Required :1 mins
    🔄Ncert Concepts :communication systems, signal processing, message reconstruction

    Related Questions

    1.

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

    A

    80 km and 3MHz

    B

    90 km and 3.5 MHz

    C

    120 km and 4.5 MHz

    D

    110 km and 4 MHz

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    âš¡ Time Required :1 mins
    🔄Ncert Concepts :Earth's Atmosphere, Ionospheric Layers, Virtual Height, Critical Frequency

    2.

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

    A

    0.01%

    B

    1%

    C

    10%

    D

    25%

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    âš¡ Time Required :1 mins
    🔄Ncert Concepts :refractive index, step-index fiber, optical fiber

    3.

    Ozone layer above earth's atmosphere will not

    A

    be above Earth's atmosphere

    B

    protect us from harmful UV radiation

    C

    be located in the stratosphere

    D

    be composed of O3 molecules

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    âš¡ Time Required :2 mins
    🔄Ncert Concepts :Ozone layer, Electromagnetic spectrum, Radiation absorption, Atmospheric layers

    4.

    If the area to be covered for TV telecast is doubled, then height of transmitting antenna (TV tower) will have to be

    A

    Doubled

    B

    Increased by a factor of sqrt(2)

    C

    Halved

    D

    Increased by a factor of 4

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    âš¡ Time Required :2 mins
    🔄Ncert Concepts :Relationship between antenna height and coverage area, Radio wave propagation

    5.

    Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70°. Then x is

    A

    150 MHz

    B

    170 MHz

    C

    175 MHz

    D

    190 MHz

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    âš¡ Time Required :2 mins
    🔄Ncert Concepts :Maximum Usable Frequency, Critical Frequency, Angle of Incidence, Radio wave propagation

    6.

    A laser beam of pulse power 1012  W{10^{12}}{\rm{\;W}} is focused on an object of area 10−4  cm2.{10^{ - 4}}\;{\rm{c}}{{\rm{m}}^2}. The energy flux in Watt cm−2{\rm{c}}{{\rm{m}}^{ - 2}}. The energy flux in Watt cm−2{\rm{c}}{{\rm{m}}^{ - 2}} at the point of focus is

    A

    1020{10^{20}}

    B

    1016{10^{16}}

    C

    108{10^8}

    D

    104{10^4}

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    âš¡ Time Required :1 mins
    🔄Ncert Concepts :Energy flux, Power, Area

    7.

    The area of the region covered by the TV broadcast by a TV tower of 100 m height is (radius of the earth =6.4imes106m) = 6.4 imes {10^6}m)

    A

    12.8πimes108  km212.8\pi imes {10^8}\;k{m^2}

    B

    1.28πimes103  km21.28\pi imes {10^3}\;k{m^2}

    C

    0.64πimes103  km20.64\pi imes {10^3}\;k{m^2}

    D

    1.28πimes103  km21.28\pi imes {10^3}\;k{m^2}

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    âš¡ Time Required :3 mins
    🔄Ncert Concepts :Geometry, Approximations, Radio Communication Range

    8.

    To cover a population of 20 lakh, a transmission tower should have a height … (Radius of earth = 6400 km, population per square km =1000)

    A

    25m

    B

    50m

    C

    75m

    D

    100m

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    âš¡ Time Required :3 mins
    🔄Ncert Concepts :Area of a circle, Population density, Coverage radius, Height of a tower

    9.

    The bit rate for a signal, which has a sampling rate of 8 kHz and where 16 quantisation levels have been used is

    A

    32000 bits/s

    B

    16000 bits/s

    C

    64000 bits/s

    D

    72000 bits/s

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    âš¡ Time Required :2 mins
    🔄Ncert Concepts :Sampling Rate, Quantization Levels, Bit Rate

    10.

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

    A

    Through space

    B

    Through wires

    C

    By superimposing it on undamped electromagnetic waves

    D

    By superimposing it on damped electromagnetic waves

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Communication System
    🎯Topic:Communication Systems
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    âš¡ Time Required :2 mins
    🔄Ncert Concepts :Electromagnetic waves, Sound waves, Wave propagation, Modulation

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