Chapter Exam

Chapter-13 Sound — Online MCQ Test

Q: Sound is produced by the vibration of objects. Which of the following is NOT a source of sound?

Answer: B. A stationary book on a table — A stationary book does not vibrate and therefore produces no sound. Sound requires vibrations of matter to be generated.

Q: What is the approximate speed of sound in air at room temperature (20°C)?

Answer: B. 343 m/s — The speed of sound in air at room temperature is approximately 343 m/s. This is a fundamental fact in acoustics.

Q: Sound travels fastest through which medium?

Answer: C. Steel — Sound travels fastest in solids like steel (~5000 m/s), slower in liquids like water (~1500 m/s), and slowest in gases like air (~340 m/s). Sound cannot travel in a vacuum.

PHYSICS · Grade 10 · IGCSE cambridge

Practice Chapter-13 Sound with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 PHYSICS. This chapter covers: Production and transmission of sound speed of sound echoes and the range of human hearing.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-13 Sound — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 PHYSICS — Chapter-13 Sound, with answers and explanations. These are sample questions; the exam has its own separate question set.

Sound is produced by the vibration of objects. Which of the following is NOT a source of sound?

A. A vibrating tuning fork
B. A stationary book on a table ✓
C. A drumhead being struck
D. A plucked guitar string

Answer: B. A stationary book on a table
A stationary book does not vibrate and therefore produces no sound. Sound requires vibrations of matter to be generated.

What is the approximate speed of sound in air at room temperature (20°C)?

A. 100 m/s
B. 343 m/s ✓
C. 1500 m/s
D. 3000 m/s

Answer: B. 343 m/s
The speed of sound in air at room temperature is approximately 343 m/s. This is a fundamental fact in acoustics.

Sound travels fastest through which medium?

A. Air
B. Water
C. Steel ✓
D. Vacuum

Answer: C. Steel
Sound travels fastest in solids like steel (~5000 m/s), slower in liquids like water (~1500 m/s), and slowest in gases like air (~340 m/s). Sound cannot travel in a vacuum.

Sound travels faster in warm air than in cold air because:

A. Warm air has lower density
B. Warm air molecules move faster and transmit vibrations more efficiently ✓
C. Warm air has higher frequency sound waves
D. Warm air absorbs less sound energy

Answer: B. Warm air molecules move faster and transmit vibrations more efficiently
At higher temperatures, gas molecules move faster with greater kinetic energy, allowing them to transmit sound vibrations more efficiently through the medium.

A dolphin produces echolocation clicks at 100 kHz. Which of the following is true about these sound waves compared to human speech (100-1000 Hz)?

A. Dolphin clicks have longer wavelengths and higher frequency
B. Dolphin clicks have shorter wavelengths and higher frequency ✓
C. Dolphin clicks travel faster because they have higher frequency
D. Dolphin clicks cannot travel through water due to high frequency

Answer: B. Dolphin clicks have shorter wavelengths and higher frequency
Dolphin clicks (100 kHz) have much higher frequency than human speech. Since speed is constant in a given medium, higher frequency means shorter wavelength (λ = v/f). Speed is independent of frequency.