Sound Quiz - CBSE Class 8 Science

Free practice quiz: Sound (CBSE Class 8 Science). 13 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is sound?

   1. A form of energy that travels in waves
   2. A type of light
   3. A type of heat
   4. A type of pressure
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   Answer: A. A form of energy that travels in waves

   Sound is a form of energy produced by vibrations and travels as waves.

2. How does sound travel?

   1. Through a vacuum
   2. Through solids, liquids, and gases
   3. Only through solids
   4. Only through air
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   Answer: B. Through solids, liquids, and gases

   Sound needs a medium to travel, such as air, water, or solids. It cannot travel through a vacuum.

3. What is the range of human hearing?

   1. 20 Hz to 20 kHz
   2. 10 Hz to 10 kHz
   3. 200 Hz to 200 kHz
   4. 100 Hz to 100 kHz
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   Answer: A. 20 Hz to 20 kHz

   Humans can generally hear sounds between 20 Hz and 20 kHz.

4. How does the speed of sound change with the density of the medium?

   1. Speed increases with increasing density
   2. Speed decreases with increasing density
   3. Speed is unaffected by density
   4. It depends on the medium
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   Answer: A. Speed increases with increasing density

   Sound travels faster in denser mediums.

5. Why is sound louder near the source?

   1. Sound waves lose energy as they travel
   2. Sound waves diffract as they travel
   3. Sound waves interfere constructively near the source
   4. Sound waves reflect off the source
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   Answer: A. Sound waves lose energy as they travel

   The intensity (loudness) of a sound wave decreases with distance from the source due to energy loss through spreading and absorption.

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