8th Grade > Physics
SOUND MCQs
Total Questions : 55
| Page 2 of 6 pages
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 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 B. -> False
:
B
Sound waves travel as longitudinal wavesin liquids and gases. However, in solids, they canpropagateas both longitudinal andtransverse waves.
:
B
Sound waves travel as longitudinal wavesin liquids and gases. However, in solids, they canpropagateas both longitudinal andtransverse waves.
Answer: Option B. -> Solids
:
B
Sound wave travels the fastest in solids and the slowest in gases. Sound waves requires a medium for its propagation. Therefore, it cannot travel through vacuum.
:
B
Sound wave travels the fastest in solids and the slowest in gases. Sound waves requires a medium for its propagation. Therefore, it cannot travel through vacuum.
Answer: Option A. -> True
:
A
Vibrations are responsible forthe production of sounds.In a flute, air columnvibrates to produce sound.
:
A
Vibrations are responsible forthe production of sounds.In a flute, air columnvibrates to produce sound.
Answer: Option B. -> 5 Hz
:
B
The audible range for humans is 20Hz to 20kHz. From the above, 5Hz is not audible to humans. Sounds with frequencies below 20Hz are called infrasonic sounds and above20kHz are called ultrasonic sounds.
:
B
The audible range for humans is 20Hz to 20kHz. From the above, 5Hz is not audible to humans. Sounds with frequencies below 20Hz are called infrasonic sounds and above20kHz are called ultrasonic sounds.
Answer: Option A. -> True
:
A
In air, the speed of light is about 3×108ms−1, whilethe speed of sound is about 343ms−1.Thus, the given statement is true.
:
A
In air, the speed of light is about 3×108ms−1, whilethe speed of sound is about 343ms−1.Thus, the given statement is true.
Answer: Option D. -> Loudness
:
D
The amplitude of a sound wave determines its loudness or intensity. More the amplitude, louder is the sound.
:
D
The amplitude of a sound wave determines its loudness or intensity. More the amplitude, louder is the sound.
Answer: Option C. -> 2 Hz
:
C
Given:speed of the boy, v=20m/s
Distance between points A and B,d=5m
Time taken by the boy to complete one round of to and fro motion is:
T=2dv
T=2×5m20m/s
T=0.5s
Thus, time period of to and fro motion of the boy is0.5 s. Frequency is the inverse of time period.
f=1T
f=10.5s
f=2Hz
:
C
Given:speed of the boy, v=20m/s
Distance between points A and B,d=5m
Time taken by the boy to complete one round of to and fro motion is:
T=2dv
T=2×5m20m/s
T=0.5s
Thus, time period of to and fro motion of the boy is0.5 s. Frequency is the inverse of time period.
f=1T
f=10.5s
f=2Hz
Answer: Option A. -> True
:
A
The given statement is true. We must never putsharp, pointed objectssuch aspen, pencil, etc. into our ears. It can damage the eardrum andcause hearing impairment since the eardrum is a thin, stretched membrane.
:
A
The given statement is true. We must never putsharp, pointed objectssuch aspen, pencil, etc. into our ears. It can damage the eardrum andcause hearing impairment since the eardrum is a thin, stretched membrane.
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