Solved NCERT Questions For Class 12 Physics Chapter 15 In Hindi - Free PDF
FAQs on NCERT Solutions For Class 12 Physics Chapter 15 Communication Systems In Hindi Mediem in Hindi - 2025-26
1. Where can I find reliable, step-by-step NCERT Solutions for Class 12 Physics Chapter 15, Communication Systems?
You can find expert-verified and detailed NCERT Solutions for Class 12 Physics Chapter 15 right here on Vedantu. Our solutions provide a step-by-step guide to solving all the exercise questions from the NCERT textbook, helping you understand the correct methodology and formulas as per the CBSE 2025-26 guidelines.
2. Is Chapter 15, Communication Systems, included in the CBSE Class 12 Physics syllabus for the 2025-26 board exams?
No, as per the latest syllabus issued by the CBSE for the 2025-26 academic session, Chapter 15 (Communication Systems) has been deleted from the curriculum. While it is present in the NCERT textbook, no questions will be asked from this chapter in the Class 12 board examinations.
3. If Chapter 15 is not in the CBSE syllabus, why should I still go through the NCERT solutions for it?
While Chapter 15 is excluded from board exams, its concepts are crucial for various competitive entrance exams like JEE Main, NEET, and other state-level engineering tests. Studying the NCERT solutions helps build a strong foundation in the basics of communication, which is beneficial for these exams and for students pursuing higher studies in electronics or telecommunications.
4. What is the correct method to solve numerical problems related to bandwidth in the NCERT exercises?
The NCERT solutions demonstrate that to find the bandwidth of an amplitude-modulated (AM) wave, you use the formula: Bandwidth = 2 x frequency of the modulating signal (fm). The solutions guide you to first identify the frequency of the audio/message signal from the problem statement and then apply this simple formula to calculate the range of frequencies the AM wave occupies.
5. How do the NCERT solutions for Chapter 15 explain the difference between modulation and demodulation?
Our NCERT solutions explain these processes as two opposite but essential parts of communication.
- Modulation is the process at the transmitter where a low-frequency message signal is superimposed onto a high-frequency carrier wave to enable long-distance transmission.
- Demodulation (or detection) is the reverse process at the receiver, where the original low-frequency message signal is separated and recovered from the high-frequency carrier wave.
6. What key elements of a communication system are explained in the solutions for this chapter?
The NCERT Solutions for Chapter 15 detail the three fundamental elements of any communication system:
- Transmitter: Processes the original message signal to make it suitable for transmission over a channel.
- Channel: The physical medium (like free space, optical fibre, or coaxial cable) through which the signal travels from the transmitter to the receiver.
- Receiver: Reconstructs a recognisable form of the original message signal after it has travelled through the channel.
7. What is the correct way to calculate the modulation index as shown in the NCERT solutions?
The NCERT solutions illustrate two primary methods to calculate the modulation index (μ or ma) based on the given data:
- When the amplitudes of the message signal (Am) and carrier wave (Ac) are known, the formula is μ = Am / Ac.
- When the maximum and minimum amplitudes of the modulated wave (Amax and Amin) are given, the formula is μ = (Amax - Amin) / (Amax + Amin).
