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Class 12 Physics: Communication Systems
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MCQs on communication system elements, electronic communication system basic terminology, signals and transmission medium bandwidth, electromagnetic waves propagation, modulation and its necessity, amplitude modulation, amplitude modulated wave production and detection.

Class 12 Physics: Communication Systems
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25 Questions

1. Which of the following is false?
2. What is defined as the largest distance between the source and the destination upto which a signal can be received with sufficient strength?
3. In communication with help of antenna if the height is doubled, then the range covered which was initially r would become what?
4. Which one of the following is a way to produce a signal?
5. Why is AM used for broadcasting in the communication systems?
6. Identify the limitation of amplitude modification.
7. Identify the range of optical communication from the following.
8. Identify the one that is not required in the process of production of amplitude modulated wave?
9. Which one of the following is the process of recovering the modulated signal?
10. Name the device which converts energy from one form to another.
11. Which of the following is the purpose of the transmitter?
12. Which among the following can be an input to a transmitter?
13. What is the frequency range for a speech signal?
14. What is the maximum distance up to which a TV transmission can be received if the TV tower has a height of 50 m?
15. The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to which of the following?
16. Which of the following is true about carrier signal?
17. Identify the type of modulation where the modulating wave is superimposed on a high-frequency carrier wave.
18. Identify the device which is a combination of a transmitter, an amplifier and a receiver which picks up a signal and retransmits it.
19. What is the modulation used to?
20. Why audio signals cannot be transmitted directly?
21. A carrier of peak voltage 15 V is used to transmit a message signal. If the modulation index is 70%, then what will be the peak voltage of the modulating signal?
22. An oscillator is producing FM waves of frequency 5 kHz with a variation of 15 kHz. What is the modulation index?
23. What is meant by the term communication?
24. What is the full form of IF?
25. Identify the type of modulation where the frequency of the modulated wave is equal to that of the carrier wave.

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