Principles of Communication Quiz - CBSE Class 12 Physics

Free practice quiz: Principles of Communication (CBSE Class 12 Physics). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a basic element of a communication system?

   1. Transmitter
   2. Receiver
   3. Channel
   4. Feedback
   Show answer

   Answer: D. Feedback

   While feedback is important for effective communication, it's not a fundamental element present in all communication systems. A transmitter, receiver, and channel are essential.

2. Explain the concept of signal-to-noise ratio (SNR).

   1. The ratio of signal power to noise power
   2. The ratio of signal frequency to noise frequency
   3. The ratio of signal amplitude to noise amplitude
   4. The ratio of signal bandwidth to noise bandwidth
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   Answer: A. The ratio of signal power to noise power

   SNR is a crucial metric indicating the quality of a signal; a higher SNR implies less noise interference.

3. Explain the concept of channel capacity and its limitations.

   1. The maximum rate at which data can be reliably transmitted over a channel, limited by bandwidth and noise
   2. The maximum power a channel can handle, limited by the transmitter's power
   3. The maximum distance a signal can travel, limited by signal attenuation
   4. The maximum number of users a channel can support, limited by signal interference
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   Answer: A. The maximum rate at which data can be reliably transmitted over a channel, limited by bandwidth and noise

   Shannon's theorem describes the fundamental limits of channel capacity.

4. How does noise affect the performance of a communication system, and what techniques are used to mitigate its effects?

   1. Noise introduces unwanted signals that interfere with the desired signal, reducing signal quality and requiring techniques like filtering, coding, and error correction.
   2. Noise increases signal strength, improving communication range.
   3. Noise causes signal delay.
   4. Noise has no significant effect on communication systems.
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   Answer: A. Noise introduces unwanted signals that interfere with the desired signal, reducing signal quality and requiring techniques like filtering, coding, and error correction.

   Understanding noise and its mitigation is crucial for robust communication systems.

5. Explain how channel coding techniques improve the reliability of communication in the presence of noise.

   1. Channel coding adds redundancy to the transmitted data, allowing the receiver to detect and correct errors caused by noise.
   2. Channel coding reduces the bandwidth required for transmission.
   3. Channel coding increases the power of the transmitted signal.
   4. Channel coding simplifies the modulation process.
   Show answer

   Answer: A. Channel coding adds redundancy to the transmitted data, allowing the receiver to detect and correct errors caused by noise.

   Error correction codes are fundamental for reliable data transmission in noisy channels.

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