In the Following Statements, Tick ‘T’ Against Those Which Are True, and ‘F’ Against Those Which Are False. Sound Cannot Travel in Vacuum. (T / F) - Science

True or False

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

Sound cannot travel in vacuum. (T / F)


  • True

  • False




Sound requires a medium to travel through. Since vacuum is devoid of any medium, sound cannot travel through it.

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Chapter 13: Sound - Exercises [Page 169]


NCERT Science Class 8
Chapter 13 Sound
Exercises | Q 3.1 | Page 169


Choose the correct answer.

Sound can travel through

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).

Name one solid, on liquid and one gas through which sound can travel.

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

State one observation from everyday life which shows that sound travels much more slow than light.

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?

The frequency of the sound emitted by the loudspeaker is 1020 Hz. Calculate the wavelength of the sound wave in air in cm where its velocity is 340 m/s.

Define the terms 'frequency', 'wavelength' and 'velocity' of a sound wave. What is the relation between them?

Sound travels in air :

The sound waves travel fastest :

The velocities of sound waves in four media P, Q, R and S are 18,000 km/h, 900 km/h, 0 km/h and 1200 km/h respectively. Which medium could be a liquid substance?

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.'

Compare approximately the speed of sound in air, water and steel.

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.

Describe an experiment to prove that a material medium is necessary for the propagation of sound.

What is the approximate value of the speed of sound in air at N.T.P.?

What are the requisites of the medium for the propagation of sound? Briefly, explain them.

What is the audible range of frequency?

Can we hear sounds of frequencies:
Less than 20 Hz

Does audible range of frequency vary from person and also with the age of the person?

Name the Sound of the Frequency Given Below:
2000 Hz

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

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)

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

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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