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Class 12 Physics Practice Test: Communication Systems - Modulation and its Necessity
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Class 12 Physics Practice Test: Communication Systems - Modulation and its Necessity
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10 Questions

1. Modulation is a process of the superposing high-frequency audio signal on low-frequency radiowaves.
2. If the highest modulating frequency of the wave is 10 kHz, what is the number of stations that can be accommodated in a bandwidth of 200 kHz?
3. Why audio signals cannot be transmitted directly?
4. What happens in frequency modulation?
5. Identify the limitation of amplitude modification.
6. An oscillator is producing FM waves of frequency 5 kHz with a variation of 15 kHz. What is the modulation index?
7. What is the maximum distance up to which a TV transmission can be received if the TV tower has a height of 50 m?
8. What is the modulation used to?
9. Why is AM used for broadcasting in the communication systems?
10. What happens in a frequency modulated wave?

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