8th Grade > Physics
SOUND MCQs
Total Questions : 55
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Answer: Option A. -> 50 Hz
:
A
Given:
Time period of the wave, T=0.020s
Frequency and time period are related as:
f=1T
f=10.020s
f=50Hz
:
A
Given:
Time period of the wave, T=0.020s
Frequency and time period are related as:
f=1T
f=10.020s
f=50Hz
Answer: Option B. -> It converts ear drum vibrations into electrical impulses.
:
B
The cochlea is a snail shell-like structure present in the inner ear that converts the vibrations of the ear drum or the tympanic membrane into electrical impulses. These electrical signals are then transmitted to the brain via the auditory nerve which then will aid us in hearing.
:
B
The cochlea is a snail shell-like structure present in the inner ear that converts the vibrations of the ear drum or the tympanic membrane into electrical impulses. These electrical signals are then transmitted to the brain via the auditory nerve which then will aid us in hearing.
Answer: Option B. -> False
:
B
Soundcannot propagate through vacuum. As there is no atmosphere on the moon, sound waves cannot be heard and the given statement is false.
:
B
Soundcannot propagate through vacuum. As there is no atmosphere on the moon, sound waves cannot be heard and the given statement is false.
Answer: Option A. -> 10 Hz
:
A
Here, total number of oscillations = 10
Total time taken = 1s
Hence, time taken for 1 oscillation = 110 s
Thetime required to complete one oscillation is known as time period (T).
Now, frequency, f=1T = 10 Hz
:
A
Here, total number of oscillations = 10
Total time taken = 1s
Hence, time taken for 1 oscillation = 110 s
Thetime required to complete one oscillation is known as time period (T).
Now, frequency, f=1T = 10 Hz
Answer: Option B. -> Enhance the vibrations reaching middle ear
:
B
There are three bonespresent 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 bonespresent 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. -> loudness
:
B
The amplitude of a sound wave is the maximum distance of a crest or a trough from the mean line. It determines the loudness of the sound. Greater the amplitude, greater will be the loudness.
:
B
The amplitude of a sound wave is the maximum distance of a crest or a trough from the mean line. It determines the loudness of the sound. Greater the amplitude, greater will be the loudness.
Answer: Option D. -> above 20,000 Hz
:
D
Ultrasonic refers to sound having frequency higher than the upper audible limit of human hearing. It has frequency above 20,000 Hz.
:
D
Ultrasonic refers to sound having frequency higher than the upper audible limit of human hearing. It has frequency above 20,000 Hz.
Answer: Option A. -> East-west
:
A
In a longitudinal wave, particles of the medium vibrate parallel to the direction of wave propagation. As the given wave is travelling in the west direction, the particles will also vibrate along the east-west direction.
:
A
In a longitudinal wave, particles of the medium vibrate parallel to the direction of wave propagation. As the given wave is travelling in the west direction, the particles will also vibrate along the east-west direction.
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.
Answer: Option D. -> The sound produced by the whistle has a higher pitch than the drum.
:
D
The pitch of a sound depends on its frequency. It is given, the frequency of thedrum is lower than that of thewhistle. Hence, the drum produces a lower pitched sound as compared to thewhistle.
:
D
The pitch of a sound depends on its frequency. It is given, the frequency of thedrum is lower than that of thewhistle. Hence, the drum produces a lower pitched sound as compared to thewhistle.
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