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Chapter 11: Sound — Online MCQ Test

SCIENCE · CLASS 9th · Karnataka State Board
Practice Chapter 11: Sound with a free chapter-wise online MCQ test. This chapter covers: This chapter covers sound production propagation wave nature velocity reflection sonar human ear structure and audible frequency ranges.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 11: Sound — Important Questions & Answers

What produces sound in most musical instruments?
  • A. Vibrating objects
  • B. Static objects
  • C. Objects at rest
  • D. Only hot objects
Answer: A. Vibrating objects
Sound is produced when an object vibrates. These vibrations create disturbances in the surrounding medium.
Sound cannot travel through which of the following?
  • A. Water
  • B. Air
  • C. Vacuum
  • D. Steel
Answer: C. Vacuum
Sound needs a material medium to propagate. It cannot travel through vacuum because there are no particles to carry the vibrations.
Why can sound travel faster in solids than in gases?
  • A. Solids are always hotter
  • B. Particles in solids are closer together
  • C. Solids have no particles
  • D. Gases reflect sound more
Answer: B. Particles in solids are closer together
In solids, particles are closely packed, so vibrations are passed more quickly from one particle to another.
Which of the following is NOT a property of sound?
  • A. Pitch
  • B. Loudness
  • C. Colour
  • D. Quality
Answer: C. Colour
Colour is a property of light, not sound. Sound is described by properties such as pitch, loudness, and quality.
Which part of the ear converts sound vibrations into electrical signals?
  • A. Pinna
  • B. Ear canal
  • C. Cochlea
  • D. Ossicles
Answer: C. Cochlea
The cochlea contains sensory cells that convert mechanical vibrations into nerve impulses for the brain.