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# Communication Systems Physics

At Saralstudy, we are providing you with the solution of Class 12th physics Communication Systems Physics according to the latest NCERT (CBSE) Book guidelines prepared by expert teachers. Here we are trying to give you a detailed answer to the questions of the entire topic of this chapter so that you can get more marks in your examinations by preparing the answers based on this lesson. We are trying our best to give you detailed answers to all the questions of all the topics of Class 12th physics Communication Systems Physics so that you can prepare for the exam according to your own pace and your speed.

The last chapter of the book of NCERT Physics Class 12, tell you about the communication systems and this chapter comprises of ten topics. Communication System tells you about the three basic elements of a communication system, bandwidth of signals and transmission medium, concept of wave propagation, satellite communication, propagation of electromagnetic waves, amplitude modulation. There is an exercise at the end of this chapter for the final check of your progress. With the help of Saralstudy, you can the easy learning and more accurate solutions of NCERT Physics Class 12.

Download pdf of NCERT Solutions for Class physics Chapter 15 Communication Systems Physics

Download pdf of NCERT Examplar with Solutions for Class physics Chapter 15 Communication Systems Physics ### Exercise 1

•  Q1 Which of the following frequencies will be suitable for beyond the horizon communication using sky waves? (a) 10 kHz (b) 10 MHz (c) 1 GHz (d) 1000 GHz Q2 Frequencies in the UHF range normally propagate by means of   (a) Ground waves. (b) Sky waves. (c) Surface waves. (d) Space waves. Q3 Digital signals (i) Do not provide a continuous set of values, (ii) Represent values as discrete steps, (iii) Can utilize binary system, and (iv) Can utilize decimal as well as binary systems. Which of the above statements are true? (a) (i) and (ii) only (b) (ii) and (iii) only (c) (i), (ii) and (iii) but not (iv) (d) All of (i), (ii), (iii) and (iv). Q4 Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81m tall. How much service area can it cover if the receiving antenna is at the ground level? Q5 A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%? Q6 A modulating signal is a square wave, as shown in Fig. 15.14. The carrier wave is given by (i) Sketch the amplitude modulated waveform (ii) What is the modulation index? Q7 For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is found to be 2 V. Determine the modulation index μ. What would be the value of μ if the minimum amplitude is zero volt? Q8 Due to economic reasons, only the upper sideband of an AM wave is transmitted, but at the receiving station, there is a facility for generating the carrier. Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station.

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