Physics
Grade-8
Easy
Question
Frequency is denoted by _____.
- λ
- π
- A
- ν
Hint:
υ
The correct answer is: ν
- Frequency is denoted by the symbol υ.
- Pronounced as nu.
- So, the correct option is d.
- Wavelength is denoted by λ.
- Pronounced as lambda.
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When the air pressure near the ear drum decreases, it ____.
- Compressions/high pressure pushes the eardrum inwards.
When the air pressure near the ear drum decreases, it ____.
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- Compressions/high pressure pushes the eardrum inwards.
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The conversion of the amplified pressure vibrations to electrical signals is done by _____.
- Auditory nerve transmits the signals from the internal ear (cochlea) to the brain.
- Ear ossicles amplify the sound.
The conversion of the amplified pressure vibrations to electrical signals is done by _____.
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- Auditory nerve transmits the signals from the internal ear (cochlea) to the brain.
- Ear ossicles amplify the sound.
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The ear drum receives the sound in the form of ____.
The ear drum receives the sound in the form of ____.
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The sounds with frequencies smaller than 20 Hz are called _____.
- Sounds with frequencies 20Hz to 20kHz are called audible frequencies.
- Sounds with frequencies more than 20Khz are called ultrasound.
The sounds with frequencies smaller than 20 Hz are called _____.
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- Sounds with frequencies 20Hz to 20kHz are called audible frequencies.
- Sounds with frequencies more than 20Khz are called ultrasound.
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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 using ___________ .
Distance can be measured using ___________ .
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Which of the following amplifies the pressure variations causing the sound?
Which of the following amplifies the pressure variations causing the sound?
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If the audible sound frequency increases, then the sound becomes ______.
If the audible sound frequency increases, then the sound becomes ______.
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Anvil is a part of ____.
Anvil is a part of ____.
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Human can hear ultrasounds.
Human can hear ultrasounds.
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The audible frequency range can be more than 20000Hz.
The audible frequency range can be more than 20000Hz.
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Cochlea is a part of which of these?
Cochlea is a part of which of these?
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The shape of the atomic structure can be found by ______.
The shape of the atomic structure can be found by ______.
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Decreasing amplitude decreases _______.
- The amplitude of a vibrating body continuously decreases during damped vibrations.
- Because the frictional (resistive) force due to the surrounding medium causes the energy loss.
Decreasing amplitude decreases _______.
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- The amplitude of a vibrating body continuously decreases during damped vibrations.
- Because the frictional (resistive) force due to the surrounding medium causes the energy loss.
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Which of the following parts acts as a passage for the sound waves into the ear?
Which of the following parts acts as a passage for the sound waves into the ear?
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