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Revision Notes

Sound and Communication — Revision Notes

NIOS · Class 10 · Science & Tech

Sound and Communication revision notes for NIOS Class 10 Science & Tech: 4 topics in quick points. Part of the NIOS Class 10 Science & Tech syllabus.

43 questions42 flashcards3 formulas & key relations5 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, vibration, and wave nature, Mechanical and electromagnetic waves, Nature, measure, and quality of sound, Musical sound and instruments. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How should I revise Sound and Communication for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 43 practice questions on Sound and Communication. Revise 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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