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Science M.C.Q. [I MARKS]

Sound · MP Board (MPBSE) STD 8 (Madhya Pradesh - English Medium). 210 questions.

Questions · Page 3 of 5

M.C.Q. [I MARKS]

MCQ 1011 Mark
Which of the following modes is utilized in the production of sound by humans?
  • A
    Vibrating membranes.
  • B
    Vibrating plates.
  • ✓
    Vibrating strings.
  • D
    Vibrating air columns.
Answer
Correct option: C.
Vibrating strings.
The vocal cords are two bands of smooth muscle tissue found in the larynx. The larynx or the voice box is set in the neck at the top of the trachea $($windpipe$)$. The vocal cords vibrate and air passes through the cords from the lungs to produce the sound of your voice. The vocal folds, also known popularly as vocal cords, are composed of twin infoldings of mucous membrane stretched horizontally across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation. The vocal cords in men are about $20mm$ long. In women these are about $5mm$ shorter. Children have very short vocal cords. This is the reason why the voices of men, women and children are different.
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MCQ 1021 Mark
Which one of the following material will reflect sound better?
  • A
    Thermocole
  • B
    Curtain made from cloth
  • ✓
    Steel
  • D
    Paper
Answer
Correct option: C.
Steel
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MCQ 1031 Mark
Read the given statements and select the correct option.
Statement $1:$ When Ravi saw a film on space wars, he didn't hear any explosions.
Statement $2:$ Sound travels slowest through gases
  • A
    Both statements $1$ and $2$ are true and statement $2$ is the correct explanation of statement $1.$
  • ✓
    Both statements $1$ and $2$ are true but statement $2$ is not the correct explanation of statement $1.$
  • C
    Statement $1$ is true but statement $2$ is false.
  • D
    Statement $1$ is false but statement $2$ is true.
Answer
Correct option: B.
Both statements $1$ and $2$ are true but statement $2$ is not the correct explanation of statement $1.$
In a film on space wars, the sound of explosion would not be heard because sound does not travel in vacuum. It needs a medium to travel, which can be solid, liquid or gas. The speed of sound is maximum in solids and minimum in gases.
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MCQ 1041 Mark
Before playing the orchestra is in a musical concert a sitarist tries to adjust the tension and pluck the string suitably. By doing so he is adjusting:
  • A
    Intensity of the sound only.
  • B
    Amplitude of the sound only.
  • ✓
    Frequency of the sitar string with the frequency of other musical instruments.
  • D
    Loudness of the sound.
Answer
Correct option: C.
Frequency of the sitar string with the frequency of other musical instruments.
A violin and a flute may both be played at the same time in an orchestra. Both sounds travel through the same medium, that is, air and arrive at our ear at the same time. Both sounds travel at the same speed irrespective of the source. But the sounds we receive are different. This is due to the different characteristics associated with the sound. Generally, tone and note should be matched in pleasant way. So, the sitarist adjusts the frequency of sitar according to other musical instruments. Only if all the musical instruments are in the same frequency, will the output will be in unison. Otherwise, the music will not be pleasing to the hear’s ears.
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MCQ 1051 Mark
The pitch of sound depends on the $...........$ of the vibrating body.
  • A
    Amplitude
  • B
    Noise
  • ✓
    Frequency
  • D
    Medium of propagation
Answer
Correct option: C.
Frequency
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MCQ 1061 Mark
The number of oscillations per second is called$...........?$
  • A
    Amplitude of oscillation
  • B
    Pitch of oscillation
  • ✓
    Frequency of oscillation
  • D
    None of the above
Answer
Correct option: C.
Frequency of oscillation
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MCQ 1071 Mark
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting:
  • A
    Intensity of sound only.
  • B
    Amplitude of sound only.
  • ✓
    Frequency of the sitar string, with the frequency of other musical instruments.
  • D
    Loudness of sound.
Answer
Correct option: C.
Frequency of the sitar string, with the frequency of other musical instruments.
He is adjusting the frequency of the sitar string, with the frequency of other musical instruments.
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MCQ 1081 Mark
Hertz stands for:
  • A
    second
  • ✓
    second$^{−1}$
  • C
    meter
  • D
    meter$^1$
Answer
Correct option: B.
second$^{−1}$
Hertz is the unit of frequency and frequency is defined as number of vibrations per second,
$f =$ number of vibrations/ time $($in second$),$
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MCQ 1091 Mark
Voice of man is heavy compared to a woman because:
  • A
    Female vocal cord is longer
  • B
    Male vocal cord is shorter
  • ✓
    Male vocal cord is longer
  • D
    The concept is not related
Answer
Correct option: C.
Male vocal cord is longer
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MCQ 1101 Mark
The time taken to complete $...........$ oscillation $(s)$ is called time period.
  • ✓
    One
  • B
    Ten
  • C
    Two
  • D
    Hundred
Answer
Correct option: A.
One
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MCQ 1111 Mark
To an fro motion of an object is called:
  • A
    Waves.
  • B
    Amplitude.
  • ✓
    Vibration.
  • D
    All of the above.
Answer
Correct option: C.
Vibration.
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MCQ 1121 Mark
In order to reduce the loudness of a sound, we have to$...........?$
  • A
    decrease its frequency of vibration of the sound.
  • B
    increase its frequency of vibration of the sound.
  • ✓
    decrease its amplitude of vibration of the sound.
  • D
    increase its amplitude of vibration of the sound.
Answer
Correct option: C.
decrease its amplitude of vibration of the sound.
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MCQ 1131 Mark
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
  • A
    Sound is a form of energy which makes us hear.
  • B
    Sound is produced by vibrating objects.
  • ✓
    Sound is produced by different objects but human cannot produce sound.
  • D
    The vibration of the sound producing object are so small that we cannot see them easily.
Answer
Correct option: C.
Sound is produced by different objects but human cannot produce sound.
Human can also produce sound by vocal cords. The vibration of our vocal cords are small so, we can only feel them with our hands. When we talk, we make sound. When we sing we make sound very easily by our throat or voice box.
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MCQ 1141 Mark
The quality of sound produced by a tuning fork is different from that produced by a musical instrument because of difference in:
  • A
    Amplitude
  • B
    Frequency
  • ✓
    Harmonics
  • D
    None of these
Answer
Correct option: C.
Harmonics
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MCQ 1151 Mark
Consider the following statements and choose the correct one:
  • A
    Sound is produced by the vibration of vocal cords.
  • B
    The human voice box or larynx contain two ligaments known as “vocal cords”.
  • C
    The human beings produce sound by using the voice box which is called larynx.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
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MCQ 1161 Mark
Read the given statements and select the correct option.
Statement 1: Sound would travel faster on a hot summer day than on a cold winter day.
Statement 2: Velocity of sound depends on temperature.
  • ✓
    Both statements $1$ and $2$ are true and statement $2$ is the correct explanation of statement $1.$
  • B
    Both statements $1$ and $2$ are true but statement $2$ is not the correct explanation of statement $1.$
  • C
    Statement $1$ is true and statement $2$ is false.
  • D
    Both statements $1$ and $2$ are false.
Answer
Correct option: A.
Both statements $1$ and $2$ are true and statement $2$ is the correct explanation of statement $1.$

Velocity of sound increases with increase in temperature. So sound wave travels faster on a hot summer day than on a cold winter day.

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MCQ 1171 Mark
$1$ hertz is equal to:
  • A
    $1$ vibration per minute.
  • B
    $10$ vibrations per minute.
  • ✓
    $60$ vibrations per minute.
  • D
    $600$ vibrations per minute.
Answer
Correct option: C.
$60$ vibrations per minute.
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MCQ 1181 Mark
Sound waves were sent down from a ship and they returned after $2$ seconds. What is the depth of the sea, if the speed of sound in water is $1.5\ km s^{-1}\ ?$
  • A
    $150\ m$
  • B
    $3\ km$
  • ✓
    $1.5\ km$
  • D
    $750\ m$
Answer
Correct option: C.
$1.5\ km$
Let the depth of the sea $= x$ The time taken by sound wave to go down and then return to the ship $= 2s$
$\therefore$ The distance travelled by the sound wave $= x \div x = 2x$ Speed of sound $(v) = 1.5\ kms$ As distance $=$ speed $\times$ time, $2x = 1.5 \times 2, x = 1.5\ km.$
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MCQ 1191 Mark
Which of the following is true for an oscillating pendulum of fixed length?
  • A
    Frequency depends on amplitude of oscillation.
  • B
    Frequency and time$-$period are not related.
  • C
    Time$-$period depends on amplitude of oscillation.
  • ✓
    Frequency and time$-$period do not depend on amplitude of oscillation.
Answer
Correct option: D.
Frequency and time$-$period do not depend on amplitude of oscillation.
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MCQ 1201 Mark
If frequency of a wave is $5 Hz$, then it is:
  • A
    Ultrasonics
  • B
    Microwaves
  • ✓
    Infrasonics
  • D
    Radio waves
Answer
Correct option: C.
Infrasonics

Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than $20 \ Hz$ or cycles per second, the "normal" limit of human hearing.
So $5Hz$ is infrasonic.

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MCQ 1211 Mark
Eardrum is a part of:
  • A
    Sound producing organ.
  • B
    Skeletal system.
  • ✓
    Hearing organ.
  • D
    Reproductive organ.
Answer
Correct option: C.
Hearing organ.
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MCQ 1231 Mark
Sound helps us to:
  • A
    View each other
  • B
    Identify one another
  • ✓
    Communicate with one another
  • D
    Group each other
Answer
Correct option: C.
Communicate with one another
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MCQ 1251 Mark
The maximum speed of vibrations which produce audible sound will be in:
  • A
    Dry air.
  • B
    Sea water.
  • ✓
    Ground glass.
  • D
    Human blood.
Answer
Correct option: C.
Ground glass.
The sound travels faster in solids than liquids than gases.
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MCQ 1261 Mark
The hearing range of human ear is:
  • ✓
    $20Hz$ to $20,000Hz$
  • B
    Less than $20Hz$
  • C
    More than $20,000Hz$
  • D
    $20Hz$ to $25,000Hz$
Answer
Correct option: A.
$20Hz$ to $20,000Hz$
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MCQ 1271 Mark
Loudness of sound is measured in units of:
  • ✓
    Decibel $(dB)$
  • B
    Hertz $(Hz)$
  • C
    Metre $(m)$
  • D
    Metre/second $(m/s)$
Answer
Correct option: A.
Decibel $(dB)$

Unit of loudness of sound is decibel$(dB).,,$

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MCQ 1281 Mark
We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called:
  • A
    Frequency
  • ✓
    Timbre
  • C
    Pitch
  • D
    Loudness
Answer
Correct option: B.
Timbre
Timbre or rhythm or modulation can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound. Sounds may be generally characterized by pitch, loudness, and quality. Sound quality or timbre describes those characteristics of sound which allow the ear to distinguish sounds which have the same pitch and loudness. Timbre is general term for the distinguishable characteristics of a tone. Hence, the quality or timbre of sound is that characteristic which enables us to distinguish one sound from one person to another having the same pitch and loudness.
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MCQ 1291 Mark
In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?
  • A
    Ultrasound is used to study the growth of foetus inside the mother’s womb.
  • B
    Ultrasound is used to measure the depth of sea or ocean and also used to locate underwater objects.
  • C
    Ultrasound is used in the treatment of muscular pain and a disease called arthritis which is inflammation of joints.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
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MCQ 1301 Mark
The sound waves travel fastest:
  • ✓
    In solids.
  • B
    In liquids.
  • C
    In gases.
  • D
    In vacuum.
Answer
Correct option: A.
In solids.
The sound travels faster in solids than liquids than gases.
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MCQ 1311 Mark
The loudness of sound depends on:
  • ✓
    Its amplitude.
  • B
    Its time period.
  • C
    Its frequency.
  • D
    Its speed.
Answer
Correct option: A.
Its amplitude.
Sound will be loud when its amplitude is large and sound will be soft when its amplitude is small hence, loudness of sound depends upon its amplitude.
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MCQ 1321 Mark
Which of the following require material medium for propagation?
  • A
    All of these
  • ✓
    Sound
  • C
    Light
  • D
    Transverse wave
Answer
Correct option: B.
Sound
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MCQ 1331 Mark
The frequency of subsonic sound is:
  • A
    More than $20\ Hz$
  • B
    $100\ Hz$
  • ✓
    Less than $20\ Hz$
  • D
    More than $20,000\ Hz$
Answer
Correct option: C.
Less than $20\ Hz$
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MCQ 1351 Mark
Direction: Read the given paragraph and answer the following questions.
Two metal rulers of lengths $30\ cm$ and $60\ cm$ are kept in such a manner that a $30\ cm$ ruler extends about $15\ cm$ over the edge and a $60\ cm$ ruler extends about $30\ cm$ over the edge. Both the ends are flicked.
Read the given statements and select the correct option.
Statement $1:$ The note heard in the vibration of $30\ cm$ ruler is louder when flicked with larger amplitude.
Statement $2:$ Loudness of a sound depends on the amplitude of vibrations.
  • ✓
    Both statements $1$ and $2$ are true and statement $2$ is the correct explanation of statement $1.$
  • B
    Both statements $1$ and $2$ are true but statement $2$ is not the correct explanation of statement $1.$
  • C
    Statement $1$ is true but statement $2$ is false.
  • D
    Statement $1$ is false but statement $2$ is true.
Answer
Correct option: A.
Both statements $1$ and $2$ are true and statement $2$ is the correct explanation of statement $1.$
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MCQ 1361 Mark
Name the sounds of the frequencies given below $10\ Hz.$
  • A
    Ultrasonic
  • ✓
    Infrasonic
  • C
    Supersonic
  • D
    None of the above
Answer
Correct option: B.
Infrasonic
Infra-sound is a low-frequency sound. It is sound that is lower in frequency than $20 \ Hz$ or cycles per second, the normal limit of human hearing.
Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high.
The ear is the primary organ for sensing infra-sound, but at higher intensities it is possible to feel infra-sound vibrations in various parts of the body.
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MCQ 1371 Mark
The number of oscillations per second is called:
  • A
    Amplitude of oscillation
  • B
    Pitch of oscillation
  • ✓
    Frequency of oscillation
  • D
    None of the above
Answer
Correct option: C.
Frequency of oscillation
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MCQ 1381 Mark
Which of the following sound frequencies can be heard by a woman having a normal hearing range?
$A. 25000Hz.$
$B. 15\ kHz.$
$C. 40000Hz.$
$D. 25Hz.$
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $B$ and $D$
  • ✓
    Only $D$
Answer
Correct option: D.
Only $D$
$25\ Hz$ because the human audible range is $20Hz$ to $20,000Hz.$
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MCQ 1391 Mark
When an object is moved a little, it will make a $...........$ sound.
  • A
    Loud
  • ✓
    Soft
  • C
    High
  • D
    Low
Answer
Correct option: B.
Soft
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MCQ 1401 Mark
$1$ hertz is equal to $.........?$
  • A
    $1$ vibration per minute
  • B
    $10$ vibrations per minute
  • ✓
    $60$ vibrations per minute
  • D
    $600$ vibrations per minute
Answer
Correct option: C.
$60$ vibrations per minute
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MCQ 1411 Mark
The pitch of a given sound can be measured by its $...........?$
  • ✓
    Frequency
  • B
    Wavelength
  • C
    Time period
  • D
    Intensity
Answer
Correct option: A.
Frequency
The pitch of a given sound can be measured by its frequency.
A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.
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MCQ 1421 Mark
Sound of frequency $320 \ Hz$ is of lower pitch than sound of frequency:
  • A
    $10 \ Hz$
  • B
    $180 \ Hz$
  • C
    $256 \ Hz$
  • ✓
    $512 \ Hz$
Answer
Correct option: D.
$512 \ Hz$
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MCQ 1431 Mark
Human can hear sound in the range of:
  • A
    $200 - 2000Hz$
  • ✓
    $20 - 20000Hz$
  • C
    $2 - 20000Hz$
  • D
    $2000 - 200000Hz$
Answer
Correct option: B.
$20 - 20000Hz$
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MCQ 1441 Mark
In most of the cases vibration of objects are not visible because:
  • A
    Wavelength is very large
  • B
    Frequency is very less
  • ✓
    Amplitude is very small
  • D
    Wavelength is very small
Answer
Correct option: C.
Amplitude is very small
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MCQ 1471 Mark
How does a whistle produce sound?
  • A
    The body of whistle stores air.
  • ✓
    The air vibrates.
  • C
    The person produces vibrations.
  • D
    All of the above.
Answer
Correct option: B.
The air vibrates.
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MCQ 1481 Mark
Which of the following sentences incorrect $..........?$
  • A
    Sound travels about $15$ times faster in steel than in air.
  • B
    Sound travels faster in wood than in air.
  • C
    Sound travels faster in wood than in water.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
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MCQ 1491 Mark
The velocity of sound at $20^\circ C$ is approximately.
  • A
    $3400m/ sec.$
  • ✓
    $340m/ sec.$
  • C
    $430m/ sec$
  • D
    $304m/ sec.$
Answer
Correct option: B.
$340m/ sec.$
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MCQ 1501 Mark
The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance?
  • A
    $340$
  • B
    $5170$
  • C
    $1280$
  • ✓
    $1530$
Answer
Correct option: D.
$1530$
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