Tag: physics

Questions Related to physics

The persistence of hearing of human beings is not more than ________.

how humans hear sound human ear study of sound sound physics

  1. 1 s

  2. $\displaystyle \frac{1}{5}$ s

  3. $\displaystyle \frac{1}{10}$ s

  4. $\displaystyle \frac{1}{2}$ s

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Correct Option: B
Explanation:

The sensation of hearing of any sound persists in our brain is 0.1 s. This is called the persistence of hearing. The persistence of hearing of human beings is not more than $\frac{1}{5}\,s$

State whether true or false.

Vibration of the ear drum produces sensation of sound in the ears.

how humans hear sound human ear study of sound sound physics

  1. True

  2. False

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Correct Option: A
Explanation:

The sound waves produces vibration of the ear drum and subsequently a forceful vibration of the bones of the middle ear. This high amplitude vibration is transmitted to the fluid of the inner ear and encoded in the nerve signal which is sent to the brain.

Select the loudness level that is above the normal hearing range

how humans hear sound human ear study of sound sound physics

  1. 150 decibels

  2. 40 decibels

  3. 70 decibels

  4. 90 decibels

Show answer
Correct Option: A
Explanation:

In order for us to be able to hear a sound at all, it has to be above a certain level. This level is called the auditory threshold or hearing threshold. Humans have a hearing threshold of around $0$ decibels. Above this threshold, sounds with higher sound pressure levels are heard as louder noises. Sounds above $90\, dB$ can lead to chronic hearing damage if people are exposed to them every day or all the time. Hearing becomes uncomfortable if the sound pressure level is above $110$ decibels (threshold of discomfort), and it becomes painful above $130$ decibels (threshold of pain).

Sound from the outside world reach the inner ear through:

how humans hear sound human ear study of sound sound physics

  1. pinna

  2. cochlea

  3. auditory canal

  4. labyrinth

Show answer
Correct Option: C
Explanation:

Sound from the outside world are collected by pinna and reach the inner ear through auditory canal.

The sound waves starts vibrating when it reaches:

how humans hear sound human ear study of sound sound physics

  1. pinna

  2. stirrup

  3. tympanic membrane

  4. all

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Correct Option: C
Explanation:

When the sound waves strike the eardrum or tympanic membrane it starts vibrating. Sound from the outside world are collected by pinna and reach the eardrum through auditory canal.

The tympanum of the ear receive the sound in the form of_________.

how humans hear sound human ear study of sound sound physics

  1. compressions

  2. rarefaction

  3. both

  4. none

Show answer
Correct Option: C
Explanation:

The tympanum of the ear receive the sound in the form of compressions and rarefaction. These compressions and rarefaction strike the ear drum, the ear from begins to vibrate.

Mark the correct statement.

how humans hear sound human ear study of sound sound physics

  1. Time taken by two consecutive compressions or one rarefaction is called the time period of the wave.

  2. Sound of a vollin and a flue are different due to the difference in the medium through which they travel.

  3. How the brain interpnetes the frequency of an emmitted sound is called pitch.

  4. All true

Show answer
Correct Option: C
Explanation:

Time taken by 2 consecutive compression or rarefaction is called the time period of the wave.
Sound of a voilin and a flute is different due to their different pitches.

A child inserted a needle in a man's ear. The man became deaf. Why

how humans hear sound human ear study of sound sound physics

  1. the needle damaged the oval window

  2. the needle damaged the stirrup

  3. the needle damaged the ear drum

  4. all

Show answer
Correct Option: C
Explanation:

Never insert any pointed object into the ear. It can damage the eardrum and make a person deaf. Ears are very fragile and delicate organs.

The compressions and rarefactions are transmitted across the middle ear through__________.

how humans hear sound human ear study of sound sound physics

  1. auditory tube

  2. ear ossicles

  3. cochlea

  4. all

Show answer
Correct Option: B
Explanation:

The compressions and rarefactions are transmitted across the middle ear through the three ear ossicles. The vibrations produced in the ear drum are amplified.

What stimulates the auditory nerve?

how humans hear sound human ear study of sound sound physics

  1. the movement of the three ear ossicles

  2. the movement of stirrup

  3. the movement of fluid in the cochlea

  4. all

Show answer
Correct Option: C
Explanation:

Cochlea is a coiled and fluid filled tube having sense of hearing. The movement of the fluid in the cochlea due to the vibrations stimulates the auditory nerve .