Communication Systems

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Communication Systems” of Physics.

  • Q1.Modulation is the process of superposing

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  • Q2.The circuit diagram of an AM demodulator is given below. The correct relation between carrier frequency (f ) and RC for best quality demodulation is:

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  • Q3.If both the length of an antenna and the wave length of the signal to be transmitted are doubled, the power radiated by the antenna

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  • Q4.Which mode of communication is/are not employed for the transmission of T.V. signals?

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  • Q5.A transmitting antenna at the top of a tower has a height 3200 cm and that of the receiving antenna is 5000 cm. The maximum distance between them for satisfactory communication in line of sight mode is: (Radius of earth =6.4× 10 6 m)

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  • Q6.A message signal of frequency 10 kHz and peak voltage 10 volt is used to modulate a carrier of frequency 1 MHz and peak voltage 20 volt. The correct values of modulation index (μ), upper side band (USB) and lower side band (LSB) is:

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  • Q7.What is the length of quarter wave antenna for transmission frequency of 20 MHz?

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