Physics
Grade-8
Easy
Question
Drums can produce ultrasound.
- True
- False
Hint:
Only audible sound can be produced.
The correct answer is 'False'.
- Vibrations in a body produce sound.
- Human can hear sounds only in the audible range of frequency which is 20Hz to 20 kHz.
- Therefore, drums can't produce ultrasounds/high frequency sounds.
- So, the given statement is false.
Related Questions to study
Physics
Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 332 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 covered by the sound = 2d.
Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 332 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 covered by the sound = 2d.
Physics
The SI unit of time is ______.
- The SI unit of length is meter(m).
- The SI unit of pressure is Pascal(Pa).
- 1 bar = 105 Pascal
The SI unit of time is ______.
PhysicsGrade-8
- The SI unit of length is meter(m).
- The SI unit of pressure is Pascal(Pa).
- 1 bar = 105 Pascal
Physics
Reverberation occurs only in ________ .
Reverberation occurs only in ________ .
PhysicsGrade-8
Physics
A loud unpleasant sound is called a/an ______.
- An ultrasound has frequency more than 20kHz.
- And an infrasound has frequency less than 20Hz.
A loud unpleasant sound is called a/an ______.
PhysicsGrade-8
- An ultrasound has frequency more than 20kHz.
- And an infrasound has frequency less than 20Hz.
Physics
A decrease in amplitude makes a sound wave _______.
A decrease in amplitude makes a sound wave _______.
PhysicsGrade-8
Physics
Sounds that are pleasant to hear are called ultrasounds.
- Sounds which have frequencies more than 20kHz are called ultrasounds.
- Human ears are cannot perceive ultrasound.
Sounds that are pleasant to hear are called ultrasounds.
PhysicsGrade-8
- Sounds which have frequencies more than 20kHz are called ultrasounds.
- Human ears are cannot perceive ultrasound.
Physics
Communication in the submarines takes place using infra waves.
- SONAR stands for sound navigation and ranging.
Communication in the submarines takes place using infra waves.
PhysicsGrade-8
- SONAR stands for sound navigation and ranging.
Physics
The device that transmits ultrasounds in SONAR is called a/an _______.
- The receiver receives the sounds reflected from underwater objects.
The device that transmits ultrasounds in SONAR is called a/an _______.
PhysicsGrade-8
- The receiver receives the sounds reflected from underwater objects.
Physics
Echo is the_________ of sound.
- Refraction is the bending of waves when they enter one medium from another medium.
Echo is the_________ of sound.
PhysicsGrade-8
- Refraction is the bending of waves when they enter one medium from another medium.
Physics
Sound cannot travel through _________.
Sound cannot travel through _________.
PhysicsGrade-8
Physics
The multiple reflection of sound by a closed surface is called _______
- Amplified sound is any sound which is made louder.
- Echo is the reflection of sound after a delay.
The multiple reflection of sound by a closed surface is called _______
PhysicsGrade-8
- Amplified sound is any sound which is made louder.
- Echo is the reflection of sound after a delay.
Physics
If a sound is amplified, it will be comparatively ______.
Echo is the reflection of a sound.
If a sound is amplified, it will be comparatively ______.
PhysicsGrade-8
Echo is the reflection of a sound.
Physics
If the amplitude of a sound increases, then it is said to be ______ .
- An echo is a reflection of sound that arrives to the listener with a delay after the original sound.
- Reverberated sound is when you hear the same sound continuing to echo.
If the amplitude of a sound increases, then it is said to be ______ .
PhysicsGrade-8
- An echo is a reflection of sound that arrives to the listener with a delay after the original sound.
- Reverberated sound is when you hear the same sound continuing to echo.
Physics
Sound cannot travel in space because sound cannot travel through _______.
Sound cannot travel in space because sound cannot travel through _______.
PhysicsGrade-8
Physics
154Hz sound frequency comes under ________ .
- Sounds with frequencies less than 20Hz are called infrasound.
- Sounds with frequencies more than 20kHz are called ultrasounds.
154Hz sound frequency comes under ________ .
PhysicsGrade-8
- Sounds with frequencies less than 20Hz are called infrasound.
- Sounds with frequencies more than 20kHz are called ultrasounds.
