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Communication Systems

12th Standard Physics - Communication Systems Model Question Paper

Communication Systems Model Question Paper

12th Standard

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5

  1. The output transducer of the communication system converts the radio signal into ________.

    (a)

    Sound

    (b)

    Mechanical energy

    (c)

    Kinetic energy

    (d)

    None of the above

  2. The signal is aff ected by noise in a communication system _____________.

    (a)

    At the transmitter

    (b)

    At the modulator

    (c)

    In the channel

    (d)

    At the receiver

  3. The variation of frequency of carrier wave with respect to the amplitude of the modulating signal is called ______.

    (a)

    Amplitude modulation

    (b)

    Frequency modulation

    (c)

    Phase modulation

    (d)

    Pulse width modulation

  4. The internationally accepted frequency deviation for the purpose of FM broadcasts ____________.

    (a)

    75 kHz

    (b)

    68 kHz

    (c)

    80 kHz

    (d)

    70 kHz

  5. The frequency range of 3 MHz to 30 MHz is used for ______.

    (a)

    Ground wave propagation

    (b)

    Space wave propagation

    (c)

    Sky wave propagation

    (d)

    Satellite communication

    6. 5 x 2 = 10

  6. Give the factors that are responsible for transmission impairments.

  7. Distinguish between wireline and wireless communication? Specify the range of electromagnetic waves in which it is used.

  8. Explain centre frequency or resting frequency in frequency modulation.

  9. What does RADAR stand for?

  10. What do you mean by Internet of Things?

    11. 5 x 3 = 15

  11. A transmitting antenna has a height of 40 m and the height of the receiving antenna is 30 m. What is the maximum distance between them for line-of-sight communication? The radius of the earth is 6.4 × 106 m.

  12. Explain the basic elements of communication system with the necessary block diagram.

  13. Explain the ground wave propagation and space wave propagation of electromagnetic waves through space.

  14. What do you know about GPS? Write a few applications of GPS.

  15. Fiber optic communication is gaining popularity among the various transmission media -justify.

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