Sound Waves Quiz - CBSE Class 9 Science

Free practice quiz: Sound Waves (CBSE Class 9 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 19 multiple-choice questions on Sound Waves, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is sound?

   1. A pressure wave traveling through air
   2. An electromagnetic wave traveling through air
   3. A particle wave traveling through solids
   4. A series of light waves
   Show answer

   Answer: A. A pressure wave traveling through air

   Sound is a mechanical wave that travels as a pressure variation (compression and rarefaction) through a medium such as air.

2. Sound cannot travel through which of the following?

   1. Air
   2. Water
   3. Steel
   4. Vacuum
   Show answer

   Answer: D. Vacuum

   Sound requires a medium (solid, liquid, or gas) to travel, and therefore cannot propagate in a vacuum where no matter exists.

3. The phenomenon of echo is due to which of the following?

   1. Reflection
   2. Refraction
   3. Diffraction
   4. Interference
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   Answer: A. Reflection

   An echo is produced when sound waves reflect off a surface and return to the listener's ear.

4. Which property of sound is changing if you hear both a low rumble and a high squeal?

   1. Quality
   2. Pitch
   3. Volume
   4. Resonance
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   Answer: B. Pitch

   The pitch describes the frequency of sound; low rumble indicates low frequency, and high squeal indicates high frequency.

5. Which factor is responsible for the thickness of vocal cords affecting sound?

   1. Pitch
   2. Volume
   3. Quality
   4. Echo
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   Answer: A. Pitch

   Thicker vocal cords vibrate slower and produce lower-pitched sounds, while thinner cords produce higher-pitched sounds.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which unit is used to measure frequency of sound?
2. What affects the speed of sound in air?
3. Which is the correct order of increasing speed of sound in different media?
4. What happens to the wavelength of sound as it enters from a denser medium to a rarer medium?
5. How is the loudness of sound measured?
6. In which direction does a sound wave carry energy?
7. What is the main factor that affects the pitch of a sound?
8. Which type of wave is sound?
9. Which formula relates velocity, frequency, and wavelength of sound?
10. What happens to sound waves when they pass through a narrow space?
11. What is the change in frequency due to motion known as?
12. What is the role of medium in sound wave propagation?
13. Why does sound travel faster in solids than in liquids or gases?
14. Why does a tuning fork emit sound of a specific pitch?

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