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PHYSICS [1 Mark Question Answer]

Sound · ICSE STD 8 (ICSE - English Medium). 24 questions.

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[1 Mark Question Answer]

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24 questions · timed · auto-graded

Question 11 Mark
State the unit of loudness. Mention the effect of different loudness levels on human ears.
Answer
The unit of loudness is decibel $(dB)$. Even though human ears can pick up sound from $10\ dB$ to $180 \ dB$, different loudness levels have different effect on human ears. A sound between $50\ dB$ and $60\ dB$ is considered normal. Sounds up to $80\ dB$ can be tolerated. Sounds above $80\  dB$ can have harmful effects.
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Question 21 Mark
What do you understand by monotone?
Answer
A sound which never changes or goes up or down is called a monotone. A monotone sound never changes in pitch, loudness, timbre or in speed.
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Question 31 Mark
Name the different types of musical instruments.
Answer
The different types of musical instruments are wind instruments, string instruments and percussion instruments.
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Question 41 Mark
How is it possible to distinguish between sounds produced by different instruments tuned to the same frequency?
Answer
The quality of sound or timbre is used to distinguish between sounds produced by different instruments tuned to the same frequency.
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Question 51 Mark
Mention two effects produced on humans by sounds of $90\  dB$ or more.
Answer
The effect produced on humans by sounds of $90\  dB$ or more are
$a.$ feeling of annoyance, aggression, anxiety and stress.
$b.$ headache, feeling of fatigue and sleep disturbances.
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Question 61 Mark
How are loudness and amplitude related?
Answer
Loudness of sound is directly proportional to its amplitude. Higher the amplitude, louder is the sound.
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Question 71 Mark
Define the characteristic of a sound that distinguishes a shrill sound from a hoarse sound.
Answer
The characteristic of sound that distinguishes a shrill sound from a hoarse sound is called pitch.
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Question 81 Mark
Name three characteristics of sound.
Answer
Three characteristics of sound are $–$ loudness or intensity, pitch and quality or timbre of sound.
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Question 91 Mark
What do you understand by quality of sound or timbre?
Answer
The quality of sound or timbre distinguishes two notes of the same pitch $($or frequency$)$ and loudness $($or amplitude$)$ produced by different bodies.
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Question 101 Mark
How is pitch different from the frequency?
Answer
Frequency of a sound wave is the number of compressions or rare$-$factions passing a point in one second. However, pitch is the sensation of frequency of the sound wave on our ears.
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Question 111 Mark
Which of the two will have a higher pitch $–$ the sound of a whistle or that of a drum?
Answer
The sound of a whistle will have a higher pitch that of a drum.
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Question 121 Mark
Name three factors on which loudness of a sound depend.
Answer
Loudness of a sound depends on the following factors :
$1.$ Amplitude of the sound wave.
$2.$ Distance between the source of sound and the listener.
$3.$ Area of the vibrating body.
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Question 141 Mark
Music
Answer
A sound that has a pleasing sensation on our ears and is produced due to regular vibrations is called music.
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Question 151 Mark
Monotone
Answer
A sound which never changes or goes up or down is called a monotone. A monotone sound never changes in pitch, loudness, timbre or in speed.
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Question 161 Mark
Timbre
Answer
Timbre distinguishes two notes of the same pitch $($or frequency$)$ and loudness $($or amplitude$)$ produced by different bodies.
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Question 171 Mark
Pitch
Answer
The characteristic of sound that differentiates a shrill sound from a hoarse sound is called pitch.
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Question 181 Mark
Loudness
Answer
Loudness is a characteristic of sound which distinguishes a feeble sound from a loud one of the same frequency.
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Question 211 Mark
Amplitude
Answer
The maximum displacement of a wave on either side of its mean position is known as its amplitude.
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Question 221 Mark
No two musical instruments can have the same timbre. Give reason.
Answer
No two instruments can have the same timbre. This happens because a sound wave also has a unique pattern of secondary waves called harmonics and no two musical instruments can have the same harmonics.
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Question 231 Mark
If a stretched string is cut into half, how will the pitch of the sound produced by the vibrating string change?
Answer
Pitch of a sound produced by a vibrating string is inversely proportional to the length of the string. If a string is cut into half then the pitch produced by the vibrating string increases.
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Question 241 Mark
A person hears two sounds $–$ one of $60\  dB, 100\  Hz$ and other of $45\  dB, 700\  Hz$. Which sound will the person perceive to be louder?
Answer
Loudness is measured in the units of decibels. So, a sound of higher decibel is louder than a sound of lower decibel. This implies that the sound of $60\  dB, 100\  Hz$ is louder than the sound of $45\  dB, 700\  Hz.$
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[1 Mark Question Answer] - PHYSICS STD 8 Questions - Vidyadip