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.

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
   Show answer

   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
   Show answer

   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
   Show answer

   Answer: A. Pitch

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

Browse all Sound quizzes