Chapter Exam

Chapter 11: Sound — Online MCQ Test

Q: What produces sound in most musical instruments?

Answer: A. Vibrating objects — Sound is produced when an object vibrates. These vibrations create disturbances in the surrounding medium.

Q: Sound cannot travel through which of the following?

Answer: C. Vacuum — Sound needs a material medium to propagate. It cannot travel through vacuum because there are no particles to carry the vibrations.

Q: Why can sound travel faster in solids than in gases?

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.

Q: Which of the following is NOT a property of sound?

Answer: C. Colour — Colour is a property of light, not sound. Sound is described by properties such as pitch, loudness, and quality.

Q: Which part of the ear converts sound vibrations into electrical signals?

Answer: C. Cochlea — The cochlea contains sensory cells that convert mechanical vibrations into nerve impulses for the brain.

SCIENCE · CLASS 9th · Karnataka State Board

Practice Chapter 11: Sound with a free chapter-wise online MCQ test for Karnataka State Board CLASS 9th SCIENCE. 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 (FAQ)

Frequently asked questions from Karnataka State Board CLASS 9th SCIENCE — Chapter 11: Sound, with answers and explanations. These are sample questions; the exam has its own separate question set.

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?