8th Grade > Physics
SOUND MCQs
Total Questions : 55
| Page 4 of 6 pages
Answer: Option A. ->
20-200 Hz
:
A, B, and C
The standard range of audible frequencies for humans is 20 to 20,000 Hz. As we can see, except 0-20 Hz, all other options lie in the audible range.
:
A, B, and C
The standard range of audible frequencies for humans is 20 to 20,000 Hz. As we can see, except 0-20 Hz, all other options lie in the audible range.
Answer: Option A. ->
True
:
A
:
A
The given statement is true. We must never put sharp, pointed objects such as pen, pencil, etc. into our ears. It can damage the eardrum and cause hearing impairment since the eardrum is a thin, stretched membrane.
Answer: Option A. ->
True
:
A
:
A
Very loud music causes discomfort and can damage the ears. Hence, it can be considered as noise.
Answer: Option B. ->
Enhance the vibrations reaching middle ear
:
B
There are three bones present in the middle ear - malleus, incus and stapes. The function of these bones is to amplify the vibrations that reach the middle ear and send them to the inner ear.
:
B
There are three bones present in the middle ear - malleus, incus and stapes. The function of these bones is to amplify the vibrations that reach the middle ear and send them to the inner ear.
Answer: Option B. ->
larynx
:
B
:
B
Vocal cords are present in the larynx. It is also called as voice box. Their vibration is responsible for the production of sound in humans.
Answer: Option B. ->
Eardrum
:
B
The eardrum consists of a thin membrane called tympanic membrane, which receives sound, and starts vibrating. Its primary function is to transmit the sound from the air to the bones present inside the middle ear.
:
B
The eardrum consists of a thin membrane called tympanic membrane, which receives sound, and starts vibrating. Its primary function is to transmit the sound from the air to the bones present inside the middle ear.
Answer: Option A. ->
True
:
A
Sound wave is a mechanical wave and its speed is dependent on the medium in which it is travelling. It travels at different speeds in different mediums. It travels the fastest in solids and the slowest in gases.
:
A
Sound wave is a mechanical wave and its speed is dependent on the medium in which it is travelling. It travels at different speeds in different mediums. It travels the fastest in solids and the slowest in gases.
Answer: Option A. ->
oil
:
A, B, and C
:
A, B, and C
Sound can travel through solids, liquids and gasses. However, it cannot travel through vacuum.
Answer: Option A. ->
50 Hz
:
A
Given:
Time period of the wave, T=0.020 s
Frequency and time period are related as:
f=1T
f=10.020 s
f=50 Hz
:
A
Given:
Time period of the wave, T=0.020 s
Frequency and time period are related as:
f=1T
f=10.020 s
f=50 Hz
Answer: Option B. ->
60 oscillations per minute
:
B
1 hertz is the frequency of a body which completes 1 vibration or oscillation per second. Hence, in one minute, it will complete 60 oscillations.
:
B
1 hertz is the frequency of a body which completes 1 vibration or oscillation per second. Hence, in one minute, it will complete 60 oscillations.
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