1.

    The process of converting a message signal into a form suitable for transmission is called:

    A

    Modulation

    B

    Demodulation

    C

    Amplification

    D

    Detection

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :0.5 mins
    πŸ”„Ncert Concepts :Modulation

    Related Questions

    1.

    Basically, a communication system is a

    A

    system for transmitting information

    B

    device used for sending messages

    C

    method of encoding data

    D

    collection of interconnected networks

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :communication system, components

    2.

    What fraction of the surface area of earth can be covered to establish communication by one geostationary satellite?

    A

    1/21/2

    B

    1/31/3

    C

    1/41/4

    D

    1/81/8

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :geostationary satellite, field of view, spherical geometry

    3.

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

    A

    h1/2{h^{1/2}}

    B

    hh

    C

    h3{h^3}

    D

    h2{h^2}

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Range of TV transmission, Curvature of earth

    4.

    In frequency modulation

    A

    The amplitude of modulated wave varies as frequency of carrier wave

    B

    The frequency of modulated wave varies as amplitude of modulating wave

    C

    The frequency of modulated wave varies as frequency of modulating wave

    D

    The frequency of modulated wave varies as frequency of carrier wave

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Frequency Modulation, Carrier Wave, Modulating Wave, Amplitude, Frequency

    5.

    If sky wave with frequency of 50 MHz is incident on D region at an angle of 30Β°, then angle of refraction is

    A

    15∘15^\circ

    B

    30∘30^\circ

    C

    60∘60^\circ

    D

    45∘45^\circ

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Refraction, Ionospheric Propagation

    6.

    In pulse modulation of analog signals, common pulse system employed are

    A

    Pulse amplitude modulation (PAM)

    B

    Pulse position and pulse duration modulation (PPM and PDM)

    C

    Pulse code modulation (PCM)

    D

    All of the above

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Pulse Modulation, Analog Signals, PAM, PPM, PDM, PCM

    7.

    Mean optical power launched into an 8 km fibre is 120β€…β€ŠΞΌW120\;\mu W and mean output power is 4ΞΌW4\mu W, then the overall attenuation is (Given log⁑30=1.477\log 30 = 1.477)

    A

    14.77 dB

    B

    16.77 dB

    C

    3.01 dB

    D

    None of these

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Optical Power, Attenuation, Decibel

    8.

    What is ozone hole

    A

    Hole in the ozone layer

    B

    Formation of ozone layer

    C

    Thinning of ozone layer in troposphere

    D

    Reduction in ozone thickness in stratosphere

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Ozone layer, Stratosphere, Troposphere, Ozone depletion

    9.

    A radio station has two channels. One is AM at 1020 kHz and the other FM at 89.5 Mhz. For good results you will use

    A

    Longer antenna for the AM channel and shorter for the FM

    B

    Shorter antenna for the AM channel and longer for the FM

    C

    Same length antenna will work for both

    D

    Information given is not enough to say which one to use for which

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :electromagnetic waves, frequency, wavelength, antenna length

    10.

    Electromagnetic waves with frequencies greater than the critical frequency of ionosphere cannot be used for communication using sky wave propagation, because

    A

    they are absorbed by the ionosphere

    B

    they are scattered by the ionosphere

    C

    they penetrate the ionosphere

    D

    they are reflected by the ground

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Communication System
    🎯Topic:Communication Systems
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Electromagnetic waves, critical frequency, ionosphere, refractive index, sky wave propagation

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