Physics
Grade-8
Easy
Question
Sound cannot travel through _________.
- Air
- Water
- Solid
- Vacuum
Hint:
Sound is a mechanical wave.
The correct answer is: Vacuum
- Sound waves are mechanical waves.
- They need a material medium for propagation.
- Like - solid, liquid and gases.
- It cannot travel through vacuum due to the absence of particle matter.
- So, the correct option is d.
Related Questions to study
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Echo is _________ of the sound.
- Refraction is the bending of sound waves when they enter from one medium to another medium.
Echo is _________ of the sound.
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- Refraction is the bending of sound waves when they enter from one medium to another medium.
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The reflection of sound in a closed surface is called _______.
- Amplification refers to the increase of the amplitude or loudness of sound.
- The repetition of a sound that is caused by the reflection of sound wave in large spaces is called an echo.
The reflection of sound in a closed surface is called _______.
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- Amplification refers to the increase of the amplitude or loudness of sound.
- The repetition of a sound that is caused by the reflection of sound wave in large spaces is called an echo.
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Which of the below is used to amplify sound?
Which of the below is used to amplify sound?
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Units to measure sound:
- The unit of power is watt.
- The unit of force is newton.
- The unit of work is Joule.
Units to measure sound:
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- The unit of power is watt.
- The unit of force is newton.
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SONAR is used in _______
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A sonar can detect the enemy ship using
_________ .
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_________ .
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Distance can be measured in___________.
- The SI unit of time is Second.
- The SI unit of pressure is Pascal.
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Distance can be measured in___________.
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- The SI unit of time is Second.
- The SI unit of pressure is Pascal.
- The SI unit of force is Newton.
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Music is heard from a vehicle's horn.
Music is heard from a vehicle's horn.
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The SI unit of measurement of velocity is kg/s.
The SI unit of measurement of velocity is kg/s.
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A guitar can produce __________.
A guitar can produce __________.
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Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 340 m from the source. The total time taken by the sound to cover this distance is 2 s. The speed of sound is ___ m/s.
After echo, the total distance travelled = 2d
Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 340 m from the source. The total time taken by the sound to cover this distance is 2 s. The speed of sound is ___ m/s.
PhysicsGrade-8
After echo, the total distance travelled = 2d
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Decreasing amplitude of a sound wave decreases the _______.
Decreasing amplitude of a sound wave decreases the _______.
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Cinema theatres are designed for the sound to _______.
Cinema theatres are designed for the sound to _______.
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To make a sound louder, the sound should be _______.
To make a sound louder, the sound should be _______.
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If a sound travels a distance of 100 m in 2 s, its velocity is ____ m/s.
If a sound travels a distance of 100 m in 2 s, its velocity is ____ m/s.
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