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Revision Notes

Sound and Communication

NIOS · Class 10 · Science & Tech

Quick revision notes for Sound and Communication — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

43 questions42 flashcards5 concepts

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An illustration of an experiment demonstrating that sound is produced by vibrations, using a bent metallic hanger (bow) and a stretched elastic string. Shows the string vibrating when plucked and a sm
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Key Topics to Revise

1

1. Sound, vibration, and wave nature

  • Sound is a result of vibration.
  • A vibrating source produces sound, and the sound travels through a medium to the ear.
  • Sound is a mechanical wave, so it needs a material medium to travel.
2

2. Mechanical and electromagnetic waves

  • Mechanical waves require a medium for travel.
  • Electromagnetic waves do not require a medium.
  • Sound waves are mechanical waves.
3

3. Nature, measure, and quality of sound

  • Sound level is measured in decibel, written as dB.
  • Bel is named after Alexander Graham Bell.
  • The decibel scale compares two sound power levels.
4

4. Musical sound and instruments

  • Musical sound is regular and periodic.
  • Noise is irregular and unpleasant.
  • String instruments include tanpura, sitar, and ektara.

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Full Notes

Key Concepts

Sound is a result of vibrationSound is a mechanical waveElectromagnetic waves do not needA wave is described by amplitudeHuman beings hear sound in

Frequently Asked Questions

What are the important topics in Sound and Communication for NIOS Class 10 Science & Tech?
Key topics in Sound and Communication include Sound and Communication Concept Overview, Overview of different types of communication methods and technologies, Process of sound production and perception from vibration to hearing. These are the concepts NIOS Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Sound and Communication — NIOS Class 10 Science & Tech?
Understand the core concepts first, then work through the 43 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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