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8th CBSE
IMPORTANT
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Which of these statements proves that sound can travel through solids?

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Important Questions on Sound

EASY
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 8
Which part of the human ear vibrates on receiving sound waves?
HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 9
On a rainy night, Manu observed that every time there was lightning and thunder, he would usually see the lightning a few seconds before he heard the thunder. What could be the reason for this?
HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 10
A ship has anchored in an ocean. The ocean is 10,500 m deep. An engineer from the ship sent a signal straight down into the water. How long will it take for the echo to reach him? (Velocity of sound in water is taken as 1.5 km s-1.)
HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 11

An astronaut is moving in space when a big explosion occurs about a hundred meters behind him. How will the astronaut come to know about the explosion?

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HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 12

The sound wave is a longitudinal wave. Longitudinal waves are those waves in which the particles of the medium vibrate parallel or antiparallel along the direction of propagation of the wave. The longitudinal wave travels with the formation of 'rarefactions' and 'compressions'. Compression is the part of the wave in which the particles of the medium are closer than they normally are. Here, the density of the medium is more than the normal density and volume decreases momentarily. Rarefaction is that part of the wave in which the particles of the medium are farther apart than they normally are. Here, the density of the medium is less than the normal density and the volume increases momentarily. 

In the figure given, compared to wave P, wave Q would be _____.

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HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 13
While drinking a soft drink, Ram starts blowing into the mouth of the bottle and finds that it makes a sound. He challenges his friend Riya to make a sound of the same pitch using her bottle, which was smaller in size. In which of these arrangements will that happen?
HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 14
During the class prize-giving ceremony, Anand clapped his hands hard while Kumar clapped his hands softly. Everybody could hear Anand's clapping while only a few could hear Kumar's clapping. This was because the sound produced by Anand was of
HARD
8th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class VIII>Chapter 10 - Sound>Exercise>Q 15
Raghu is part of a classical music band. He plays the tabla in the band. While practising, the band adjusted their instruments. How will Raghu adjust the pitch of the tabla to match with the other instruments in the band?