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Sound CBSE Class 8

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Question 1/16

Q 1. Whales communicate with each other in the sea even when they are at far distances because _________. 

Solution

Whales communicate with each other in the sea even when they are at far distances because sound travels faster in liquids than in air. 

Q 2. Lesser the frequency, lesser is the ________.

Solution

Lesser the frequency, lesser is the pitch. 

Q 3. __________ is made of three bones—malleus, anvil and stirrup. 

Solution

The ossicle is made of three bones—malleus, anvil and stirrup 

Q 4. The part of the ear which is filled with fluid and has fine hair is called ________. 

Solution

The part of the ear which is filled with fluid and has fine hair is called cochlea. 

Q 5. Sound travels in the form of ________ and _______.

Solution

Sound travels in the form of longitudinal waves which consist of compressions and rarefactions. 

Q 6. Sound requires a __________ for its propagation 

Solution

Sound requires a medium for its propagation.

Q 7. Lesser the amplitude, ______ is the sound produced.

Solution

Lesser the amplitude, softer is the sound produced. 

Q 8. Sound travels 15 times faster than in gases.

Solution

Sound travels 15 times faster in solids than in gases. 

Q 9. Instruments which produce sound due to a stretched membrane are called ________ instruments. 

Solution

Instruments which produce sound due to a stretched membrane are called percussion instruments.

Q 10. Sound cannot pass through ______. 

Solution

Sound cannot travel through vacuum.

Q 11. Speed of sound in air is ______. 

Solution

Speed of sound in air is 330 m/s. 

Q 12. Which is a string instrument? 

Solution

A violin produces sound due to its strings.

Q 13. The to and fro motion of particles about the mean position is called ________. 

Solution

The to and fro motion of particles about the mean position is called vibration. 

Q 14. The audible range of sound for human beings is __________.

Solution

The audible range of sound for human beings is 20- 20000 Hz (20000 Hz = 20 kHz).

KHz (kilo Hertz) 

Q 15. Sound travels with a less speed in __________. 

Solution

Sound travels with a less speed in air.

Q 16. Vibration is also known as ______. 

Solution

Vibration is also known as oscillation. 

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