Communication Systems with Answers MCQs with answers

Dear candidates you will find MCQ questions of 12th Class - Physics | Chapter: Communication Systems with Answers here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
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Q. Who undertook the first space walk and in which year?
  • (A) Leonov 1965
  • (B) Neil Armstrong, 1969
  • (C) Rakesh Sharma. 1998
  • (D) None of these
💬 Discuss
✅ Correct Answer: (A) Leonov 1965
Q. The term used “to collect the information about an object and a place without physical contact” is called :
  • (A) modulation
  • (B) communication
  • (C) amplification
  • (D) remote sensing
💬 Discuss
✅ Correct Answer: (D) remote sensing
Q. The velocity of electromagnetic wave is:
  • (A) 3 × 105 ms-1
  • (B) 3 × 106 ms-1
  • (C) 3 × 108 ms-1
  • (D) 3 × 1010 ms-1
💬 Discuss
✅ Correct Answer: (C) 3 × 108 ms-1
Q. The audio frequencies range from:
  • (A) 20 Hz to 20.000 kHz
  • (B) 20 Hz to 20 kHz
  • (C) 20 kHz to 20.000 kHz
  • (D) None of these
💬 Discuss
✅ Correct Answer: (B) 20 Hz to 20 kHz
Q. The wavelength of a wave of frequency 10 kHz is:
  • (A) 30 m
  • (B) 300 m
  • (C) 30 km
  • (D) 300 km
💬 Discuss
✅ Correct Answer: (C) 30 km
Q. The area served by an antenna of height 100 m is:
  • (A) 109m²
  • (B) 4 × 109 m²
  • (C) 6 × 109m²
  • (D) 8 × 1010m²
💬 Discuss
✅ Correct Answer: (B) 4 × 109 m²
Q. Which of the following is not transducer?
  • (A) Loudspeaker
  • (B) Amplifier
  • (C) Microphone
  • (D) All of these
💬 Discuss
✅ Correct Answer: (B) Amplifier
Q. The space waves which are affected seriously by atmospheric conditions are:
  • (A) MF
  • (B) HUF
  • (C) VHF
  • (D) UHF
💬 Discuss
✅ Correct Answer: (D) UHF
Q. An antenna is:
  • (A) Inductive
  • (B) Capacitive
  • (C) Resistive
  • (D) A transformer
💬 Discuss
✅ Correct Answer: (A) Inductive
Q. Broadcasting antenna are generally:
  • (A) Ommi directional type
  • (B) Vertical type
  • (C) Horizontal type
  • (D) None of these
💬 Discuss
✅ Correct Answer: (B) Vertical type
Q. Increase in frequency deviation results into:
  • (A) increase in noise of FM receiver
  • (B) decrease in noise of AM receiver
  • (C) ncrease in noise of Am receiver
  • (D) decrease in noise of FM receiver
💬 Discuss
✅ Correct Answer: (B) decrease in noise of AM receiver
Q. Digital signals:
  • (A) deal with all sort of values
  • (B) can use decimal system
  • (C) can use binary system
  • (D) both B and C
💬 Discuss
✅ Correct Answer: (D) both B and C
Q. Digital signals:
  • (A) represents values as discrete steps
  • (B) Do not represents values as discrete steps
  • (C) represent values steps
  • (D) represent random steps
💬 Discuss
✅ Correct Answer: (A) represents values as discrete steps
Q. AM is used for broadcasting because:
  • (A) it is more noise immune than other modulation system
  • (B) it requires less transmitting power compare with other systems
  • (C) its use avoids receiver complexity
  • (D) No other modulation system can provide the necessary bandwidth faithful transmission
💬 Discuss
✅ Correct Answer: (C) its use avoids receiver complexity
Q. Communication channel consists of:
  • (A) transmission line only
  • (B) optical fibre only
  • (C) free space only
  • (D) All of the above
💬 Discuss
✅ Correct Answer: (D) All of the above
Q. Which is more advantageous?
  • (A) analog data communication
  • (B) digital data communication
  • (C) depends on the situation
  • (D) both A and B are equally good
💬 Discuss
✅ Correct Answer: (B) digital data communication
Q. 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 electro-magnetic waves
  • (D) by superimposing it on damped electro-magnetic waves
💬 Discuss
✅ Correct Answer: (C) by superimposing it on undamped electro-magnetic waves
Q. The length of a half wave dipole at 30 mega-hertz is:
  • (A) 5 m
  • (B) 10 m
  • (C) 25 m
  • (D) 80 m
💬 Discuss
✅ Correct Answer: (A) 5 m
Q. Name the man who was first to place his foot on the moon and in which year:
  • (A) Neil Armstrong, 1969
  • (B) James Van A lien, 1971
  • (C) Leonov, 1965
  • (D) None of these
💬 Discuss
✅ Correct Answer: (A) Neil Armstrong, 1969
Q. The output of a digital computer is an example of:
  • (A) digital signal
  • (B) analog signal
  • (C) Both A and B
  • (D) None of these
💬 Discuss
✅ Correct Answer: (A) digital signal
Q. The modulation index in amplitude modulation is:
  • (A) Always zero
  • (B) Between 0 and 1
  • (C) Between 1 and ∞
  • (D) None of these
💬 Discuss
✅ Correct Answer: (C) Between 1 and ∞
Q. A microphone converts:
  • (A) sound signals into electrical signals
  • (B) electrical signals into sound signals
  • (C) Both A and B
  • (D) None of these
💬 Discuss
✅ Correct Answer: (A) sound signals into electrical signals
Q. A loudspeaker converts:
  • (A) sound signals into electrical signals
  • (B) electrical signals into sound signals
  • (C) Both A and B
  • (D) None of these
💬 Discuss
✅ Correct Answer: (B) electrical signals into sound signals
Q. The sound produced by a tuning fork is a sort of:
  • (A) analog signal
  • (B) digital signal
  • (C) Both A and B
  • (D) None of these
💬 Discuss
✅ Correct Answer: (A) analog signal

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Table of contents

  1. Who undertook the first space walk and in which year?
  2. The term used “to collect the information about an object and a place without physical contact”
  3. The velocity of electromagnetic wave is:
  4. The audio frequencies range from:
  5. The wavelength of a wave of frequency 10 kHz is:
  6. The area served by an antenna of height 100 m is:
  7. Which of the following is not transducer?
  8. The space waves which are affected seriously by atmospheric conditions are:
  9. An antenna is:
  10. Broadcasting antenna are generally:
  11. Increase in frequency deviation results into:
  12. Digital signals:
  13. Digital signals:
  14. AM is used for broadcasting because:
  15. Communication channel consists of:
  16. Which is more advantageous?
  17. In space communication, the sound waves can be sent from one place to another:
  18. The length of a half wave dipole at 30 mega-hertz is:
  19. Name the man who was first to place his foot on the moon and in which year:
  20. The output of a digital computer is an example of:
  21. The modulation index in amplitude modulation is:
  22. A microphone converts:
  23. A loudspeaker converts:
  24. The sound produced by a tuning fork is a sort of:

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