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Communication Systems

NIOS · Class 12 · Physics

Quick revision notes for Communication Systems — NIOS Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

45 questions30 flashcards5 concepts

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A block diagram illustrating the fundamental components of a communication system: Information Source, Input Transducer, Transmitter, Communication Channel, Receiver, Output Transducer, and Destinatio
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Key Topics to Revise

1

Elements of a Communication System

  • Every communication system has three fundamental components: Transmitter, Channel (medium), and Receiver.
  • The transmitter processes and sends the signal; the channel carries it; the receiver intercepts and decodes it.
  • A transducer converts one form of energy to another (e.g., microphone converts sound to electrical signal).
2

Analog and Digital Signals

  • Analog signals vary continuously with time — they can take any value within a range (e.g., human speech, music).
  • Digital signals are discrete — they exist only as specific values (0 or 1) at distinct time intervals.
  • In digital format, signals are represented as a string of bits (binary digits), where each bit is either ON (1) or OFF (0).
3

Bandwidth of Signals and Electromagnetic Waves

  • Human speech has a bandwidth of about 4 kHz (frequency range: 300 Hz to 3400 Hz for telephone).
  • AM radio transmission bandwidth: approximately 10 kHz.
  • FM radio transmission bandwidth: approximately 15 kHz (FM gives better quality than AM).
4

Radio Frequency Bands and Their Applications

  • ELF (Extremely Low Frequency): < 3 kHz, wavelength > 100 km — used for mains electricity.
  • VLF (Very Low Frequency): 3–30 kHz, wavelength 10–100 km — used for SONAR.
  • LF (Low Frequency): 30–300 kHz, wavelength 1–10 km — marine navigation, AM Long Wave (144–351 kHz).

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Full Notes

Key Concepts

Every communication systemANALOGUE SIGNALBandwidth is the range of frequenciesElectromagnetic waves are used as carriersGuided media physically connect the transmitter

Frequently Asked Questions

What are the important topics in Communication Systems for NIOS Class 12 Physics?
Key topics in Communication Systems include Communication Systems – Complete Concept Map, How to Write a Perfect Physics Answer — Step-by-Step, Communication Systems — Complete Chapter Overview. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Communication Systems — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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