Physics
Grade-8
Easy
Question
The organ that is responsible for the voice of humans is _____.
- Ear
- Mouth
- Windpipe
- Vocal cord
Hint:
The voice box in Humans contains two ligaments called vocal cords.
The correct answer is: Vocal cord
The organ that is responsible for the voice of humans is vocal cord.
- The vocal cords are responsible for the production of sound.
- It is a membranous tissue that is folded and present in the larynx.
- It is responsible for the production of sound for speech.
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Sound is a form of ____.
Sound is a form of ____.
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Pick the wrong statement about echo.
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Cinema theatres are designed for sound _______.
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To make sound louder, sound should be _______.
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Sonar has a receiver called __________
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Sonar has a receiver called __________
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- Seismographs are instruments used to record the motion of the ground during an earthquake.
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If the sound travelled a distance of 12 m in 2 s. Find the velocity of sound in echo.
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The units of time:
1 Bar = 105 Pascal
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1 Bar = 105 Pascal
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Reverberation occurs only in ________.
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The louder unpleasant sound is called as ______.
The louder unpleasant sound is called as ______.
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SONAR is used in _______.
- It works on the principle of reflection of ultrasound waves.
SONAR is used in _______.
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- It works on the principle of reflection of ultrasound waves.
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The sound from the transmitter of the SONAR is reflected by.
The sound from the transmitter of the SONAR is reflected by.
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The SONAR can detect the enemy ship using _________.
The SONAR can detect the enemy ship using _________.
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Distance can be measured in ___________.
- The SI unit of time is second.
- The SI unit of pressure is pascal.
- The SI unit of force is newton.
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.
