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PHYSICS [2 Mark Question Answer]

Sound · ICSE STD 8 (ICSE - English Medium). 12 questions.

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[2 Mark Question Answer]

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12 questions · timed · auto-graded

Question 12 Marks
If the amplitude of a wave is doubled, what will be the effect on its loudness?
Answer
The loudness of sound is directly proportional to the square of the amplitude of waves. Loudness a $($amplitude$) { }^2$ When the amplitude is doubled loudness becomes $(2)^2=4$ times
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Question 22 Marks
How is loudness related to the amplitude of wave?
Answer
Greater the amplitude, greater is the loudness.
Image
If we strike the drum gently, a faint sound is heard. But if we strike it hard, a loud sound is heard.
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Question 32 Marks
What is longitudinal wave?
Answer
Longitudinal wave: The wave in which the particles of the medium vibrate about their mean positions in the direction of propagation of sound is called longitudinal wave. Such a wave can be produced in solids, liquids as well as gases.
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Question 42 Marks
How is the pitch of sound in a guitar changed if $(a)$ thin wire is used, $(b)$ wire under less tension is used?
Answer
$(a)$ Thin wire used $-$ Higher pitch is obtained.
$(b)$ Wire under less tension is used $- $ a low pitch is obtained.
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Question 52 Marks
Name the characteristic of the sound affected due to a change in its $(a)$ amplitude $(b)$ waveform $(c)$ frequency.
Answer
$(a)$ amplitude $-$ Loudness $(b)$ waveform $-$ Quality $(c)$ frequency $-$ Pitch.
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Question 62 Marks
State the factors that determine
$(a)$ the pitch of a note.
$(b)$ the loudness of the sound heard.
$(c)$ the quality of the note.
Answer
$(a)$ the pitch of a note $-$ Frequency
$(b)$ the loudness of the sound heard $-$ Amplitude
$(c)$ the quality of the note $-$ Waveform
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Question 72 Marks
Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are as shown in figure.
How do they differ in
$(a)$ loudness,
$(b)$ pitch and
$(c)$ quality
Answer
$(a)$ Loudness of each is same as amplitude is same.
$(b)$ Pitch of each is same.
$(c)$ Quality is $\text{DIFFERENT}$ as the waveform is different
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Question 82 Marks
Figure shows two jars $A$ and $B$ containing water up to different heights. Which will produce sound of higher pitch when air is blown on them? Image
Answer
Jar $B$ which has less air column above water will produce the sound of a higher pitch.
Less air column produces increased frequency.
Image
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Question 92 Marks
How does sound travel in air?
Answer
A periodic disturbance in the medium $($Air$)$ is created by the vibration of sound and the particles of the medium vibrate about their mean position and transfer of energy in the form of sound waves takes place, i.e. in the Longitunal waves
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Question 102 Marks
The frequencies of notes given by flute, guitar and trumpet are respectively $400\  Hz, 200\  Hz$ and $500\  Hz$. Which one of these has the highest pitch?
Answer
Instrument Flute Guitar Trumpet
Frequency $400\  Hz$ $200\  Hz$ $500\  Hz$
The instrument with the highest frequency has the highest pitch.
Hence, trumpet frequency of $500\  Hz$ has the highest pitch.
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Question 112 Marks
Why is the loudness of sound heard by a plucked wire increased when mounted on a sound board?
Answer
A wire mounted on a soundboard is plucked, the surface area of vibrating air increases and sends forth a greater amount of energy, So the amplitude of vibration is large and louder is the sound
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Question 122 Marks
Two waves have frequencies $256\  Hz$ and $512\  Hz$, but same amplitude. Compare their $(i)$ loudness, and $(ii)$ pitch
Answer
$(i)$ Loudness :
$\therefore$ Amplitude of two waves is the same
$\therefore$ their loudness is the same i.e. in $1:1$
$(ii)$ Pitch :
Ratio of frequencies
$256\  Hz: 512\  Hz$
$\therefore$ Ratio of their pitch $=1:2$
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[2 Mark Question Answer] - PHYSICS STD 8 Questions - Vidyadip