JEE Main Physics: Communication Systems Practice Questions

20 questions with answers and step-by-step solutions. Tap any question to see the full worked solution.

  1. Q1.
    Which of the following frequency ranges is used for TV transmission in the VHF band?
    Easy
  2. Q2.
    What is the primary purpose of a modem in a communication system?
    Easy
  3. Q3.
    Sky wave propagation is suitable for radio waves in which frequency range?
    Easy
  4. Q4.
    If the height of a transmitting antenna is h, the range of transmission is proportional to which factor?
    Easy
  5. Q5.
    Which device is used to reduce the strength of a signal in a communication channel?
    Easy
  6. Q6.
    A message signal of frequency 10 kHz and peak voltage of 10 V is used to modulate a carrier wave of frequency 1 MHz and peak voltage of 20 V. Determine the modu
    Medium
  7. Q7.
    A transmitting antenna at the top of a tower has a height of 32 m and the height of the receiving antenna is 50 m. What is the maximum distance between them for
    Medium
  8. Q8.
    In an amplitude modulation system, the total power of the modulated wave is 600 W. If the modulation index is 0.5, what is the power of the carrier wave?
    Medium
  9. Q9.
    A signal of 5 kHz frequency is amplitude modulated on a carrier wave of 2 MHz. What are the frequencies of the sidebands produced?
    Medium
  10. Q10.
    For a digital communication system, if the signal-to-noise ratio is 30 dB, what is the ratio of signal power to noise power?
    Medium
  11. Q11.
    A TV transmission tower has a height of 100 m. If the average population density around the tower is 1000 per square kilometer, how many people can be covered b
    Hard
  12. Q12.
    In an amplitude modulation system, the total power is 600 W. If the modulation index is 0.5, what is the power carried by the carrier wave?
    Hard
  13. Q13.
    A signal of 10 kHz is modulated by a carrier of 1 MHz. If the bandwidth of the channel is 50 kHz, how many such signals can be accommodated in the channel witho
    Hard
  14. Q14.
    A receiver is connected to an antenna with an effective aperture of 5 square meters. If the incident power density of the electromagnetic wave is 10 microwatts
    Hard
  15. Q15.
    In an amplitude modulated wave, the maximum amplitude is 10 V and the minimum amplitude is 2 V. Calculate the modulation index.
    Medium
  16. Q16.
    A carrier wave of frequency 10 MHz is modulated by a signal of frequency 5 kHz. What are the frequencies of the sidebands produced?
    Medium
  17. Q17.
    A signal is to be transmitted through a channel with a bandwidth of 5 MHz. If the signal is sampled at the Nyquist rate and each sample is quantized into 128 le
    Hard
  18. Q18.
    In an amplitude modulation system, the total power is 600 W. If the modulation index is 0.5, what is the power of the carrier wave?
    Hard
  19. Q19.
    For a sky wave propagation, the critical frequency is 10 MHz. What is the maximum usable frequency for a take-off angle of 30 degrees?
    Hard
  20. Q20.
    Which device is used to reduce the noise in a communication system?
    Easy

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