Subject: General Science
Book: NCERT Physics Class 12
Study of signal transmission and communication technology.
- **Elements of a Communication System**:
- Transmitter, receiver, and channel.
- **Modulation**:
- AM, FM, and PM.
- **Propagation of EM Waves**:
- Skywave, space wave, and ground wave propagation.
**Possible Exam Questions:**
1. What are the basic elements of a communication system?
2. Explain amplitude modulation (AM) and frequency modulation (FM).
3. Describe different modes of wave propagation.
4. What is the significance of modulation in communication?
5. How do satellite communication systems work?
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