# Class 12 Physics MCQ – Communication Systems

This set of Class 12 Physics Chapter 15 Multiple Choice Questions & Answers (MCQs) focuses on “Communication Systems”. These MCQs are created based on the latest CBSE syllabus and the NCERT curriculum, offering valuable assistance for exam preparation.

1. How many elements are essential for any communication system?
a) 3
b) 2
c) 4
d) 7

Explanation: Communication is the very act of transmission of information. Irrespective of its nature, every communication system has three essential elements, namely a transmitter, a medium or channel, and a receiver.

2. Which of the following is the purpose of the transmitter?
a) Converts signals to electric form
b) Operating the received signal
c) Converting the signal into a suitable form
d) Reduces noise from signals

Explanation: The purpose of a transmitter is to convert the message signal produced by the source of information into a suitable form that can be transmitted through the channel that connects the transmitter and the receiver.

3. Which among the following can be an input to a transmitter?
a) Voice signal
b) Electric signal
c) Light signal
d) Wave signal

Explanation: If the output of the information source is a non-electrical signal such as a voice signal, then that’s where the transducer comes into play. The transducer converts this voice signal into an electric form before giving it as an input to the transmitter.

4. A channel can be either in the form of wires or wireless.
a) True
b) False

Explanation: Yes, this is a true statement. Depending upon the type of the communication system, a channel can be in the form of wires or cables connecting the transmitter and the receiver or it can also be wireless.

5. Which of the following is the reason for signal distortion?
a) Speed of the signal
b) Wearing down of the essential elements
c) Absence of a channel
d) Channel imperfection

Explanation: Channel imperfection is that the reason for distortion when a transmitted signal propagates along the channel. Moreover, the receiver receives a corrupted version of the transmitted signal thanks to the addition of noise to the transmitted signal.
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6. What is the function of the receiver?
a) Converts signal into electric form
b) Reducing noise during transmission
c) Operating on the received signal
d) Converting the signal into a useful form

Explanation: The receiver does the function of operating on the received signal. The receiver reconstructs a recognizable form of the original message signal in order to deliver the signal to the user of information.

7. Find the odd one out.
b) Telephone
c) Television
d) Computer networking

Explanation: The telephone is the odd one out. Telephones belong to the category of point-to-point communication, whereas all the others belong to the broadcast mode of communication. In point-to-point communication mode, communication takes place over a link between a single transmitter and a receiver. In broadcast mode, there are a large number of receivers corresponding to a single transmitter.

More MCQs on Class 12 Physics Chapter 15:

To practice all chapters and topics of class 12 Physics, here is complete set of 1000+ Multiple Choice Questions and Answers.