When we hear a sound, does any part of our body vibrate? Name the part. - Science

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When we hear a sound, does any part of our body vibrate? Name the part.



Yes, It is the eardrum which vibrates and sends vibrations to the inner ear, when we hear any sound.

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Chapter 13: Sound - Very Short Answer Questions [Page 74]


NCERT Exemplar Science Class 8
Chapter 13 Sound
Very Short Answer Questions | Q 14. | Page 74


Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?

Cite an experiment to show that sound needs a material medium for its propagation.

Choose the correct answer.

Sound can travel through

In the following statement, tick ‘T’ against true, and ‘F’ against  false.

Sound cannot travel in vacuum. (T / F)

Fill in the blank.

Sound can travel in a ______

Fill in the blank.

Sound requires a ________ for propagation.

Select the correct alternative :

Sound cannot travel in

Can sound travel through a vacuum ? Describe an experiment to explain your answer.

Can two person hear each other on moon’s surface ? Give reason to support your answer.

Name the type of waves which are used by astronauts to communicate with one another on moon (or in outer space).

Is the speed of sound more in water or in steel?

Out of solids, liquids and gases :
(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?

When we open a gas tap of a few seconds, the sound of escaping gas is heard first but the smell of gas comes later. Why?

Explain why, a ringing bell suspended in a vacuum chamber cannot be heard outside.

A body vibrating with a time-period of `1/256` s produces a sound wave which travels in air with a velocity of 350 m/s. Calculate the wavelength.

Through which of the following materials can sound travel? wood, air, water, steam, ice, hydrogen, steel, diamond.

The sound waves travel fastest :

Fill in the blank and explain.

Sound does not travel through ______.

Give scientific reasons:

As the sound wave propagates from one place to the other in air, the air itself is not required to move from one place to the other.

Explain the experiment, with a neat diagram, to prove the following:
'Sound needs material medium for propagation.'

Describe in brief, with the aid of a lebelled diagram, an experiment to demonstrate that a material medium is necessary for propagation of sound.

State three characteristics of the medium required for propagation of sound?

State two properties of medium on which the speed of sound in it depends.

Answer the following question :
How does the speed of sound differ in different media?

Flash of lightning reaches earlier than the sound of thunder. Explain the reason.

Complete the following sentences :

When sound travels in a medium, the particles of medium ___________ but the disturbance ___________.

A boy fires a gun and another boy at a distance hears the sound of fire 2.5s after seeing the flash. If the speed of sound in air 340 m/s, find distance between the boys. 

Assuming the speed of sound in air equal to 340 m/s and in water equal to 1360 m/s, find the time taken to travel a distance 1700 m by sound in (i) air (ii) water.

Fill in the blank with the proper word.

The propagation of sound does not occur through a ______.

Write the answer in your own words.

Explain with the help of practical examples how sound is propagated through solids.

Name the Sound of the Frequency Given Below:
2000 Hz

Name the Sound of the Frequency Given Below:
45 kHz

Ruthvik and Ruha hear a gunshot 2 second after it is fired. How far away from the gun they are standing? (Speed of sound in air is equal to 330ms-1)

Sound cannot travel in ______.

The speed of sound is ______ in solids than in liquids

______ is the distance between two consecutive particles.

______ is the number of vibrations of a particle in the medium, in one second

In any medium, as the ______ increases, the speed of sound also increases.

the speed of sound in air is 331 ms-1 at ______ and ______ at 22°C.

The amount of water vapour present in the air is known as ______.

Rarefactions are the regions of ______ where particles are spread apart.

The small to and fro motion is called vibration.

Find the odd one out.


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