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# Class XII Physics Communication System Quiz 4

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Question 1

The waves used for line-of-sight (LOS) communication is

Question 2

In a common base amplifier, the phase difference between input and output is

Question 3

A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz?

Question 4

The carrier frequency in an FM modulator is 500 kHz. If the modulating frequency is 3 kHz. What are the upper sideband and two lower sideband frequencies?

Question 5

A sinusoidal wave carrier voltage of frequency 2 MHz and amplitude 200 volts is amplitude modulated by the sinusoidal voltage of frequency 10 kHz producing modulation. Calculate the frequency and amplitude of upper and lower sidebands.

Question 6

Which of the following is/are drawback of Amplitude Modulation?

Question 7

Which of the following is true for Frequency Modulation?

Question 8

For ground wave transmission which of the following is true.
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