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Science M.C.Q. [I MARKS]

Sound · Gujarat Board (GSEB) STD 8 (GSEB - English Medium). 210 questions.

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M.C.Q. [I MARKS]

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210 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Voice of which of the following is likely to have minimum frequency:
  • ✓
    Baby girl
  • B
    Baby boy
  • C
    A man
  • D
    A woman
Answer
Correct option: A.
Baby girl
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MCQ 21 Mark
Sound can travel through:
  • A
    Gases only
  • B
    Solids only
  • C
    Liquids only
  • ✓
    Solids, liquids and gases
Answer
Correct option: D.
Solids, liquids and gases
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MCQ 31 Mark
The number of vibrations made by a vibrating body in one second is.
  • ✓
    Frequency
  • B
    Noise
  • C
    Loudness
  • D
    Pitch
Answer
Correct option: A.
Frequency
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MCQ 41 Mark
Read the following sentences carefully, and choose the incorrect one:
  • A
    The speed of sound in air is $340$ meters per second.
  • B
    The speed of sound in water is $1500$ meters per second.
  • C
    Sound travels at a speed of $5000$ metres per second through iron or steel.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
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MCQ 51 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
$1 Hz = 1$ Vibration per sound $= 60$ vibration per minute
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MCQ 61 Mark
Pitch is the sensation of the $...........$ of an emitted sound.
  • A
    Amplitude
  • ✓
    Frequency
  • C
    Time$-$Period
  • D
    None of the above
Answer
Correct option: B.
Frequency
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MCQ 71 Mark
Consider the following statements and select the correct option which correctly identifies true $(T)$ and false $(F).$
$i.$ Short string produces notes of low pitch.
$ii.$ Thin string produces notes of high pitch.
$iii.$ Tightly stretched string produces notes of low pitch.
  • A
    $(i) - T, (ii) - F, (iii) - T$
  • B
    $(i) - T, (ii) - T, (iii) - F$
  • C
    $(i) - F, (ii) - F, (iii) - T$
  • ✓
    $(i) - F, (ii) - T, (iii) - F$
Answer
Correct option: D.
$(i) - F, (ii) - T, (iii) - F$
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MCQ 91 Mark
In which of the following media can sound travel through?
$i.$ Glass of water
$ii.$ Balloon full of air
$iii.$ Iron bar
$iv.$ Vacuum
  • A
    $(i)$ and $(ii)$
  • B
    $(i)$ and $(iii)$
  • ✓
    $(i), (ii)$ and $(iii)$
  • D
    All of these
Answer
Correct option: C.
$(i), (ii)$ and $(iii)$
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MCQ 101 Mark
Speed is$...........?$
  • ✓
    Distance/ travelled Time
  • B
    Time/ Distance travelled
  • C
    Distance travelled $\times$ Time
  • D
    Time $+$ Distance travelled
Answer
Correct option: A.
Distance/ travelled Time
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MCQ 111 Mark
The loudness of a sound depends on$...........?$
  • ✓
    Its amplitude
  • B
    Its frequency
  • C
    Its time period
  • D
    Its speed
Answer
Correct option: A.
Its amplitude
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MCQ 121 Mark
Vibrations is ...?
  • A
    How loud a sound is.
  • ✓
    A very quick movement back and forth.
  • C
    The loudness or softness of a sound.
  • D
    $A$ and $C$
Answer
Correct option: B.
A very quick movement back and forth.
A very quick movement back and forth.
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MCQ 141 Mark
There are some sounds which cannot be heard by human ear. These sounds have frequency, either more than $20\ kHz$ or less than $20Hz$ The sound whose frequency is less than the $20Hz$ is called $...........$
  • A
    Ultrasonic sound
  • ✓
    Infrasonic sound
  • C
    Plane sound
  • D
    Sonic boom
Answer
Correct option: B.
Infrasonic sound
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MCQ 151 Mark
$1Hz$ is equal to:
  • ✓
    $1$ vibration per minute.
  • B
    $10$ vibrations per minute.
  • C
    $60$ vibrations per minute.
  • D
    $600$ vibrations per minute.
Answer
Correct option: A.
$1$ vibration per minute.
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MCQ 161 Mark
Consider the following statements and choose the correct one:
  • A
    The pitch of a sound depends on the frequency of vibration.
  • B
    If the frequency of vibration is low, the sound produced has a low pitch.
  • C
    If the frequency of vibration is high, the sound produced has a high pitch.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
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MCQ 171 Mark
Puja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:
  • A
    Most of the sounds which we hear in our everyday life reach us through the air.
  • B
    Sound cannot be heard on the surface of moon because there is no air to carry the sound waves.
  • C
    The astronauts who land on moon, talk to each other through wireless sets using radio waves.
  • ✓
    Sound can be heard on the moon but only the $\frac{1}{6}^{th}$ part of the total sound.
Answer
Correct option: D.
Sound can be heard on the moon but only the $\frac{1}{6}^{th}$ part of the total sound.
Sound requires a medium for propagation. Sound cannot be heard on the surface of moon because there is no air to carry the sound waves. Mass of the moon is $\frac{1}{100}$ times and radius of moon is $\frac{1}{4}$ times that of the earth. Therefore, the gravitational attraction on the moon is about one sixth of that on the earth. Hence, the weight of an object on the moon is $\frac{1}{6}^{th}$ of the weight on the earth not the sound.
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MCQ 181 Mark
Vikash is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?
  • A
    When the muscles of vocal cords contract and stretch, the vocal cords become tight and thin and a sound of high frequency is produced.
  • B
    When the muscles relax, the vocal cords become loose and thick and a sound of low frequency is produced.
  • C
    Due to the shorter vocal cords, the frequency or pitch of a woman’s voice is higher than that of a man.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
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MCQ 191 Mark
In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?
  • A
    The outer part of ear is called “pinna”.
  • B
    The inner part of ear has a coiled tube called “cochlea”.
  • ✓
    The three tiny bones in the ear act as a system of levers and sound vibration passing them on the brain.
  • D
    None of the above.
Answer
Correct option: C.
The three tiny bones in the ear act as a system of levers and sound vibration passing them on the brain.
The three tiny bones in the middle part of ear act as a system of levers and sound vibration passing them on the “cochlea” not in brain. Cochlea sets up the vibrations or electrical impulses by auditory nerve to the brain.
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MCQ 201 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.
Since, loudness depends upon amlitude, so it can be increased by increasing amplitude and it can be decreased by decreasing amplitude.
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MCQ 221 Mark
Above $...........dB$ the sound becomes physically painful:
  • A
    $60$
  • B
    $40$
  • C
    $120$
  • ✓
    $80$
Answer
Correct option: D.
$80$
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MCQ 231 Mark
The sound from a mosquito is produced when it vibrates its wings at the average rate of $500$ vibration per second. What is the time period of the vibration?
  • ✓
    $0.002$ seconds.
  • B
    $0.02$ seconds.
  • C
    $0.2$ seconds.
  • D
    $2.0$ seconds.
Answer
Correct option: A.
$0.002$ seconds.

Mosquito vibrates $500$ vibration in $1$ second.
As, time period is the time taken to complete one vibration.
So, time period = time taken/ number of oscillations time period $= 1/ 500 = 0.002$ seconds.

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MCQ 241 Mark
Which of the following frequencies can be heard by a normal human being:
  • ✓
    $10^4\ Hz$
  • B
    $10^5\ Hz$
  • C
    $10^6\ Hz$
  • D
    $10^7\ Hz$
Answer
Correct option: A.
$10^4\ Hz$
The audible range of frequency for human ear is $20\  Hz$ to $20\  kHz$. Among the given options, only $104\  Hz$ frequency lies in the audible range.
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MCQ 251 Mark
Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros?
  • A
    $5 kHz.$
  • B
    $25 Hz.$
  • ✓
    $10 Hz.$
  • D
    $15,000 Hz.$
Answer
Correct option: C.
$10 Hz.$

$10Hz$ can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros.

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MCQ 271 Mark
Sound is produced by:
  • A
    Non$-$Vibrating objects only
  • B
    Vibrating and non$-$vibrating objects
  • C
    Vibration has no relation to sound
  • ✓
    Vibrating objects only
Answer
Correct option: D.
Vibrating objects only
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MCQ 281 Mark
Pitch of sound is determined by it's:
  • ✓
    Frequency
  • B
    Speed
  • C
    Amplitude
  • D
    Loudness
Answer
Correct option: A.
Frequency
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MCQ 291 Mark
In an experiment to measure the speed of sound in air, a boy stands $40m$ away from a wall and bangs two pieces of wood together. At the instant he hears the echo, he bangs them together again. He does this activity $50$ times. The time taken for $50$ bangs is $12s$. Which calculation gives the speed of sound in air?
  • A
    $\frac{12} { 40 \times5 0} $
  • B
    $\frac{40 \times5 0} { 12} $
  • ✓
    $\frac{40 \times2\times50}{12}$
  • D
    $\frac{40 \times2\times12}{50}$
Answer
Correct option: C.
$\frac{40 \times2\times50}{12}$
$\text{Speed} = \frac{\text{Total distance}}{\text{Total time taken}}$
Number of times he bangs two pieces of wood $= 50$
Total distance $= (40 \times 2 \times 50)m$
Total time taken $= 12s.$
$\therefore$ Speed of soundin air $= \frac{40\times2\times50}{12}$
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MCQ 301 Mark
A bomb explodes on the moon. How long will it take for the sound to reach the earth?
  • A
    $10$ seconds
  • B
    $1000$ seconds
  • C
    $1$ day
  • ✓
    Sound will not be heard
Answer
Correct option: D.
Sound will not be heard
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MCQ 311 Mark
Loudness of a sound is determined by its:
  • ✓
    Intensity
  • B
    Frequency of vibration
  • C
    Ratio of amplitude and frequency of the vibration.
  • D
    Product of amplitude and frequency of vibration.
Answer
Correct option: A.
Intensity
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MCQ 321 Mark
Which of the following statements are correct?
$i.$ Sound is produced by vibrations.
$ii.$ Sound requires a medium for propagation.
$iii.$ Light and sound both require a medium for propagation.
$iv.$ Sound travels slower than light.
$v.$ Sound travels slower than light.
  • A
    $i\  \& \ ii$ only
  • B
    $i, ii \ \&\  iii$ only
  • C
    $ii, iii \ \&\  iv$ only
  • ✓
    $i, ii \ \&\  iv$ only
Answer
Correct option: D.
$i, ii \ \&\  iv$ only
Because light can travel in vaccum also but it is only sound which requires medium to tavel.
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MCQ 331 Mark
When we change a feeble sound to a loud sound, we increase its:
  • A
    Frequency.
  • ✓
    Amplitude.
  • C
    Speed.
  • D
    Timbre.
Answer
Correct option: B.
Amplitude.
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MCQ 341 Mark
he velocities of sound waves in four media $P, Q, R$ and $S$ are $18,000km/h, 900km/h, 0 km/h,$ and 1200km/h respectively. Which medium could be a liquid substance?
  • A
    $P.$
  • B
    $Q.$
  • C
    $R.$
  • ✓
    $S.$
Answer
Correct option: D.
$S.$

Because the speed of sound in liquids is more than gas but less than solids.

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MCQ 351 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. Which of the following statements is correct regarding this?
$i.$ The metal ruler of length $30\ cm$ is able to vibrate slower.
$ii.$ The metal ruler of length $30\ cm$ produces a high pitch sound.
$iii.$ The metal ruler of length $60\ cm$ is able to vibrate faster.
$iv.$ The metal ruler of length $60\ cm$ produces a low pitch sound.
  • A
    Only $(i)$ and $(iii)$ are correct.
  • ✓
    Only $(ii)$ and $(iv)$ are correct.
  • C
    Only $(i)$ and $(iv)$ are correct.
  • D
    Only $(ii)$ and $(iii)$ are correct.
Answer
Correct option: B.
Only $(ii)$ and $(iv)$ are correct.
A smaller length of the ruler vibrating i.e., $30\ cm$ is able to vibrate faster. This increases the frequency of vibration. Hence the pitch of the sound produced is high. A larger length of the ruler vibrating produces a low pitch sound.
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MCQ 361 Mark
The hearing range of human ear is:
  • ✓
    $20 \ Hz$ to $20,000 \ Hz$
  • B
    Less than $20 \ Hz$
  • C
    More than $20,000 \ Hz$
  • D
    $20 \ Hz$ to $25,000 \ Hz$
Answer
Correct option: A.
$20 \ Hz$ to $20,000 \ Hz$
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MCQ 371 Mark
Pitch of sound is determined by its:
  • ✓
    Frequency
  • B
    Amplitude
  • C
    Speed
  • D
    Loudness
Answer
Correct option: A.
Frequency
pitch or shrillness is determined by the frequency of sound.
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MCQ 381 Mark
A student performed an experiment as shown in the figure.
What would be happened as air was pumped out of the jar and the electric bell rang?
  • A
    The sound became louder.
  • B
    The sound became fainter first and then louder once all the air was pumped out.
  • ✓
    The sound could not be heard anymore.
  • D
    The sound was the same as before.
Answer
Correct option: C.
The sound could not be heard anymore.

The sound could not be heard because he has created a vacuum inside the jar and the sound cannot travel through vacuum.

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MCQ 391 Mark
There are two bottles of glass, one bottle is two third filled with water and another bottle is filled one third with water. When we blow across the mouth of each bottle, then:
$i.$ The bottle with the less air in it gives the note of higher pitch.
$ii.$ The shorter the air column, the higher the pitch of the note produced.
  • ✓
    Both $(i)$ and $(ii)$ are correct and $(ii)$ is the correct explanation of $(i).$
  • B
    Both $(i)$ and $(ii)$ are correct but $(ii)$ is not the correct explanation of $(i).$
  • C
    Only $(i)$ is correct.
  • D
    Only $(ii)$ is correct.
Answer
Correct option: A.
Both $(i)$ and $(ii)$ are correct and $(ii)$ is the correct explanation of $(i).$
Most wind instruments work on the principle that shorter the air column, the higher the pitch of the note produced.
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MCQ 401 Mark
Noise pollution can cause:
  • A
    Insmonia
  • B
    Hypertension
  • C
    Hearing impairment
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
Noise pollution is hazardous to health in many ways as it can cause insomnia, hypertension and hearing impairment.
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MCQ 411 Mark
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea?
  • A
    $15,000\ Hz.$
  • B
    $10k\ Hz.$
  • ✓
    $50\ kHz.$
  • D
    $10,000\ Hz.$
Answer
Correct option: C.
$50\ kHz.$

The ultrasound waves can be used to measure the depth of sea.

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MCQ 431 Mark
A list of mediums is given below.
$i.$ wood
$ii.$ air
$iii.$ water
$iv.$ vacuum
In which of these mediums can sound travel?
  • A
    $i\  \& \ ii$ only 
  • ✓
    $i, ii\  \& \ iii$ only
  • C
    $iii\  \& \ iv$ only
  • D
    $ii, iii\  \& \ iv$ only
Answer
Correct option: B.
$i, ii\  \& \ iii$ only
Sound requires any medium to travel but in vacuum there is no medium, so sound cannot travel through them.
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MCQ 441 Mark
Consider the following statements and choose the incorrect one:
  • A
    Partial hearing loss can also be caused by noise pollution.
  • B
    Partial hearing loss is generally due to an illness, infection, injury or old age.
  • ✓
    Hearing aid is a small sound amplifying device worn on the ear by any deaf person.
  • D
    None of the above.
Answer
Correct option: C.
Hearing aid is a small sound amplifying device worn on the ear by any deaf person.
Hearing aid is a small sound amplifying device worn on the ear by a partially deaf person not deaf person.
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MCQ 451 Mark
Loudness of sound is determined by:
  • A
    Pitch
  • B
    Frequency
  • ✓
    Amplitude
  • D
    Time period
Answer
Correct option: C.
Amplitude
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MCQ 461 Mark
An object that does not vibrate cannot produce$...........?$
  • A
    Light
  • ✓
    Sound
  • C
    Heat
  • D
    Electricity
Answer
Correct option: B.
Sound
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MCQ 471 Mark
Drum produces sound from:
  • A
    Vibrating membrane
  • ✓
    Vibrating stretched membrane
  • C
    Vibrating strings
  • D
    None of these
Answer
Correct option: B.
Vibrating stretched membrane
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MCQ 481 Mark
Read the following sentences carefully, and choose the incorrect one:
  • 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 501 Mark
When a body moves with a speed which is greater than the speed of sound in air, it is said to be travelling at:
  • A
    Ultrasonic speed
  • ✓
    Supersonic speed
  • C
    Infrared speed
  • D
    None of the above
Answer
Correct option: B.
Supersonic speed
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MCQ 511 Mark
Length of vocal cords of women is $...........$ men.
  • A
    Greater than
  • ✓
    Less than
  • C
    Same as
  • D
    Slightly greater than
Answer
Correct option: B.
Less than
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MCQ 521 Mark
The sound energy has wide application in medical science, as well as in many other fields. The sound of high frequency used in medical science is called ultrasound. The ultrasound used for the checking of the functioning of human heart is called $...........$
  • A
    Ultrasonography
  • ✓
    Echocardiography
  • C
    Ultrasounds
  • D
    Sonography
Answer
Correct option: B.
Echocardiography
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MCQ 531 Mark
Ultrasound has frequency of vibration
  • A
    Between $20$ and $20,000 \ Hz$
  • B
    Below $20 \ Hz$
  • ✓
    Above $20,000 \ Hz$
  • D
    Between $500$ and $10,000 \ Hz$
Answer
Correct option: C.
Above $20,000 \ Hz$

Ultrasound has frequency of vibration above $20000 \ Hz.$

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MCQ 541 Mark
The loudness of sound is determined by the
  • ✓
    Amplitude of vibration
  • B
    Ratio of amplitude and frequency of vibration
  • C
    Frequency of vibration
  • D
    Product of amplitude and frequency of vibration
Answer
Correct option: A.
Amplitude of vibration
Loudness of sound is determined by the amplitude of its vibrators.
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MCQ 551 Mark
Which of the following statement is or are incorrect?
  • A
    The number of vibrations made in one second is called the frequency of vibration.
  • B
    When an object makes one vibration per second, its frequency is said to be $1$ hertz.
  • C
    The loudness of sound depends on the amplitude of vibrations of the vibrating object.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
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MCQ 561 Mark
The amplitude of the vibration of an ordinary conversation between two persons is approximately:
  • A
    $10 - 7$ metres
  • ✓
    $10 - 9$ metres
  • C
    $10 - 11$ metres
  • D
    $10 - 13$ metres
Answer
Correct option: B.
$10 - 9$ metres
The magnitude of maximum disturbance in the medium on either side of the mean position is called the amplitude of the wave.
In the case of ordinary talk, the amplitude of vibration is approximately $10^{−9}m.$
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MCQ 571 Mark
A person can hear an approaching train when he presses his ear to the railway track faster than one who simply stands on the tracks. What makes this possible?
  • A
    The vibration of railway tracks.
  • B
    The vibration of air.
  • ✓
    The speed of sound in solids is more.
  • D
    The hearing ability of the man.
Answer
Correct option: C.
The speed of sound in solids is more.
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MCQ 581 Mark
A tuning fork sends sound waves in air. If the temperature of air increases, which of the following parameters will change?
  • A
    Time period
  • B
    Frequency
  • ✓
    Wavelength
  • D
    All of these
Answer
Correct option: C.
Wavelength
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MCQ 601 Mark
Which of the following characteristics of sound depends on the amplitude of vibrations:
  • A
    Speed
  • B
    Pitch
  • ✓
    Loudness
  • D
    Quality
Answer
Correct option: C.
Loudness
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MCQ 611 Mark
The sound in the audible range is called:
  • A
    Ultrasonic sound.
  • ✓
    Sonic sound.
  • C
    Subonic sound.
  • D
    Light sound.
Answer
Correct option: B.
Sonic sound.
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MCQ 621 Mark
The unit of frequency is:
  • ✓
    Hertz
  • B
    Joule
  • C
    Ohm
  • D
    Kilo Calorie
Answer
Correct option: A.
Hertz
Frequency is the number of complete vibrational cycles of a medium per a given amount of time.
The frequency would have units of cycles/ second, waves/ second or vibrations/ second.
The unit for frequency is the Hertz (abbreviated Hz) where $1 Hz$ is equivalent to $1$ cycle/second.
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MCQ 631 Mark
One of the following can hear infrasound. This one is:
  • ✓
    Dog.
  • B
    Bat.
  • C
    Rhinoceros.
  • D
    Humans.
Answer
Correct option: A.
Dog.
Dog can hear both the infrasound as well as ultrasound.
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MCQ 641 Mark
Large amplitude of sound vibrations will produce:
  • ✓
    Loud sound
  • B
    Meak sound
  • C
    Slow sound
  • D
    Shreak
Answer
Correct option: A.
Loud sound
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MCQ 651 Mark
The 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 $(dB)$
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MCQ 661 Mark
What is the cause for the difference in the voices of men, women and children?
  • A
    Difference in larynx.
  • B
    Difference in lungs.
  • ✓
    Difference in vocal cords.
  • D
    Difference in wind pipe.
Answer
Correct option: C.
Difference in vocal cords.
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MCQ 671 Mark
Which of the following frequencies produces sound that is audible:
  • A
    $5 \ Hz$
  • B
    $15 \ Hz$
  • ✓
    $500 \ Hz$
  • D
    $50,000 \ Hz$
Answer
Correct option: C.
$500 \ Hz$
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MCQ 681 Mark
If the time period of a wave increases, then its frequency will:
  • A
    Increase
  • ✓
    Decrease
  • C
    Remain the same
  • D
    First increases then decreases
Answer
Correct option: B.
Decrease
$\text{f}=\frac{1}{\text{T}}$
$f \rightarrow$ frequency
$T \rightarrow$ timeperiod
Frequency is inversely proportional to the time period of the wave.
So when time period increases then the frequency will decrease.
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MCQ 691 Mark
The pitch of sound depends on:
  • ✓
    Frequency.
  • B
    Amplitude.
  • C
    Both of these.
  • D
    None of these.
Answer
Correct option: A.
Frequency.
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MCQ 701 Mark
Sounds can be $...........$ or $...........?$
  • A
    high$-$low
  • B
    up$-$down
  • ✓
    loud$-$soft
  • D
    loud$-$high
Answer
Correct option: C.
loud$-$soft
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MCQ 711 Mark
In dholak sound is produced due to:
  • ✓
    Stretched membrane
  • B
    Stretched strings
  • C
    Air column
  • D
    Vibration of air
Answer
Correct option: A.
Stretched membrane
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MCQ 721 Mark
Choose the statements which are incorrect about noise pollution:
  • A
    Loud noise can cause irritation and headache.
  • B
    Loud noise can even damage the ears permanently and cause deafness.
  • C
    Loud noise can cause an ailment called hypertension or high blood pressure.
  • ✓
    Loud noise gives energy to all young persons including teenag.
Answer
Correct option: D.
Loud noise gives energy to all young persons including teenag.
According to a report from the world health organization a continuous excessive loud noise exhausted your body and nerves of the brain. Excessive loud noise is harmful to us. The presence of excessive noise in the surroundings may cause main health related problems. Loud noise can damage the ear permanently and cause deafness for all young persons or teenagers if they want to hear the loud noise constantly as music.
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MCQ 731 Mark
A dog barks in a park and hears its echo after $0.5$ seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is $346\ m/ s$. The distance between the dog and the building is:
  • ✓
    $86.5\ m.$
  • B
    $80.6\ m.$
  • C
    $75\ m.$
  • D
    $8.65\ m.$
Answer
Correct option: A.
$86.5\ m.$
The echo is heard when the sound wave travels a distance $2x.$
$\text{distance}= \text{speed} \times \text{ time}$
As
$\therefore \text{2x}=346 \times 0.5$
$\text{or} \text{ x}= \frac{346 \times 0.5 }{2}= \text{86.5m.}$
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MCQ 741 Mark
Cochlea is a part of:
  • ✓
    Hearing organ.
  • B
    Sound producing organ.
  • C
    Muscular organ.
  • D
    Air pollution.
Answer
Correct option: A.
Hearing organ.
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MCQ 751 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 761 Mark
The ultrasound equipment works at frequencies:
  • ✓
    Higher than $20,000 \ Hz$
  • B
    Lower than $20,000 \ Hz$
  • C
    Less than $20 \ Hz$
  • D
    None of these
Answer
Correct option: A.
Higher than $20,000 \ Hz$
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MCQ 771 Mark
Speed of sound increase with:
  • A
    Decrease in temperature
  • ✓
    Increase in temperature
  • C
    All of the above
  • D
    Decrease in humidity
Answer
Correct option: B.
Increase in temperature
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MCQ 781 Mark
Voice of which of the following is likely to have the minimum frequency?
  • A
    Baby girl.
  • B
    Baby boy.
  • ✓
    A man.
  • D
    A woman.
Answer
Correct option: C.
A man.
The voice of man has the least frequency.
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MCQ 791 Mark
Sound can travel through:
  • A
    Gases only.
  • ✓
    Solids only.
  • C
    Liquids only.
  • D
    Solids, liquids and gases.
Answer
Correct option: B.
Solids only.
Sound does not need any material medium to travel.
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MCQ 811 Mark
Vocal cords in men are about $............$ long.
  • ✓
    $20\ mm$
  • B
    $20\ cm$
  • C
    $2\ mm$
  • D
    $2\ cm$
Answer
Correct option: A.
$20\ mm$
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MCQ 831 Mark
We know that, the sound is not transmitted by the actual movement of the particle. It is transmitted by the disturbance in the medium. The maximum distance moved by a vibrating layer on the either side of the mean position is called $...........$
  • A
    Frequency
  • ✓
    Amplitude
  • C
    Crest
  • D
    Trough
Answer
Correct option: B.
Amplitude
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MCQ 841 Mark
An ultrasound equipment works at frequency:
  • ✓
    Higher than $20,000 \ Hz$
  • B
    Higher than $10,000 \ Hz$
  • C
    Lower than $20,000 \ Hz$
  • D
    Lower than $10,000 \ Hz$
Answer
Correct option: A.
Higher than $20,000 \ Hz$
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MCQ 851 Mark
A simple pendulum makes $10$ oscillation in $20$ seconds. What is the time period and frequency of its oscillations?
  • ✓
    $0.5hz$ and $2s$ respectively.
  • B
    $0.1hz$ and $0.5s$ respectively.
  • C
    $0.2hz$ and $3s$ respectively.
  • D
    $0.3hz$ and $4s$ respectively.
Answer
Correct option: A.
$0.5hz$ and $2s$ respectively.

Oscillation $= 10$, time taken $= 20$s as we know that the number of oscillations per second is frequency.
Frequency = no. Of oscillations/ time taken $= 10/ 20 = 0.5hz.$
Time period = 1/ frequency $= 1/ 0.5 = 2s.$

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MCQ 861 Mark
If the temperature increases, then what happens to the frequency of the sound produced by the organ pipe?
  • ✓
    Increases
  • B
    Decreases
  • C
    Unchanged
  • D
    Can't say
Answer
Correct option: A.
Increases
Frequency of sound produced by the organ pipe increases with increase in temperature. The reason is that with an increase in temperature, there is a decrease in the density of air and consequently the speed of sound increases.
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MCQ 871 Mark
When we say that sound travels in a medium, what do we mean?
  • A
    The particles of the medium travel.
  • B
    The source travels.
  • ✓
    The disturbance travels.
  • D
    The medium travels.
Answer
Correct option: C.
The disturbance travels.
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MCQ 881 Mark
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
  • A
    Stretched strings.
  • B
    Stretched membranes.
  • ✓
    Metal plates.
  • D
    Air columns.
Answer
Correct option: C.
Metal plates.
Metal plates vibrates when a musical note is produced by the cymbals in an orchestra. Cymbals is a musical instrument which produces sound when being struck. The person who plays cymbals is called cymbalist. It has two discs which is made up of various alloys. It is used in metal and heavy bands, orchestra, percussion ensembles and marching groups.
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MCQ 891 Mark
The ultrasound waves can penetrate into matter to a large extent because they have:
  • A
    Very high speed.
  • ✓
    Very high frequency.
  • C
    Very high quality.
  • D
    Very high amplitude.
Answer
Correct option: B.
Very high frequency.
The ultrasound waves can penetrate into matter to a large extent because they have very high frequency.
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MCQ 901 Mark
Which of these is expected to be the best absorber of sound:
  • A
    Iron
  • B
    Wood
  • ✓
    Wool
  • D
    Cemented wall
Answer
Correct option: C.
Wool
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MCQ 921 Mark
A student sets up a slinky $PQ$ on a smooth table top in the manner as shown in figure. How can he produce transverse waves in the slinky by moving its free end $Q?$
  • A
    At an angle of $45^\circ $ with the table top.
  • B
    Backward and forward along the length of the slinky.
  • C
    Up and down.
  • ✓
    Left and right.
Answer
Correct option: D.
Left and right.

In transverse wave, vibration of a wave is perpendicular to its direction of propagation of wave.

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MCQ 941 Mark
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through:
  • A
    Water.
  • B
    Wax.
  • ✓
    Vacuum.
  • D
    Empty vessel.
Answer
Correct option: C.
Vacuum.
This note must then be passing through vacuum.
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MCQ 951 Mark
The frequency determines the of a sound:
  • A
    Loudness
  • ✓
    Pitch
  • C
    Both loudness and pitch
  • D
    None of these
Answer
Correct option: B.
Pitch
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MCQ 971 Mark
An object is vibrating at $50$ hertz. What is its time period?
  • ✓
    $0.02 s$
  • B
    $0.2 s$
  • C
    $2 s$
  • D
    $20.0 s$
Answer
Correct option: A.
$0.02 s$

We know that
Frequency $=\frac{1}{\text{Time period}}$
$\Rightarrow $ Time period$=\frac{1}{\text{Frequency}}$
$\Rightarrow $ Time period$=\frac{1}{\text{50}}=0.02 \ \text{s}$

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MCQ 981 Mark
When a tightly stretched band is plucked it:
  • A
    Vibrate but do not produce sound.
  • B
    Produce sound but do not vibrate.
  • ✓
    Vibrate and produce sound.
  • D
    Only oscillate to and fro.
Answer
Correct option: C.
Vibrate and produce sound.
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MCQ 991 Mark
In which of these medium can sound travel?
  • A
    Wood and water.
  • ✓
    Wood and water and air.
  • C
    Air and vacuum.
  • D
    Water and air and vacuum.
Answer
Correct option: B.
Wood and water and air.
Sound requires any medium to travel but in vacuum there is no medium, so sound cannot travel through them.
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MCQ 1001 Mark
The maximum displacement of a body from its mean position is called.
  • ✓
    Amplitude
  • B
    Oscillation
  • C
    Periodic motion
  • D
    Frequency
Answer
Correct option: A.
Amplitude
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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 $20,000Hz.$
View full question & answer→
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
View full question & answer→
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
View full question & answer→
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.
View full question & answer→
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.
$512 \ Hz$
View full question & answer→
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
View full question & answer→
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.
View full question & answer→
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.
$340m/ sec.$
View full question & answer→
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.
$1530$
View full question & answer→
MCQ 1511 Mark
The speed of highly penetrating ultrasonic waves is:
  • A
    Lower than those of audible sound waves.
  • B
    Higher than those of audible sound waves.
  • C
    Much higher than those of audible sound waves.
  • ✓
    Same as those of audible sound waves.
Answer
Correct option: D.
Same as those of audible sound waves.
The speed of sound waves is same in a particular medium.
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MCQ 1521 Mark
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:
  • ✓
    Sound will be louder but pitch will not be different.
  • B
    Sound will be louder and the pitch will also be higher.
  • C
    Sound will be louder but pitch will be lower.
  • D
    Both loudness and pitch will remain unaffected.
Answer
Correct option: A.
Sound will be louder but pitch will not be different.
When the mechanical piano is struck harder the second time, we find sound will be louder but pitch remains the same because the frequency has not changed. The pitch depends on frequency of the particular key which is being hit and hence there would be no change in pitch of sound. In another words, when the key of a mechanical piano struck harder, the vibrations caused are more resulting in larger amplitude of the wave that propagates from the key. Loudness depends on the square of the amplitude of the wave. Amplitude is the size of the vibration, and this determines how loud the sound is. Larger vibrations make a louder sound. Pitch of the sound depends on the frequency of the wave which is not change when the key is struck harder.
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MCQ 1531 Mark
Choose the examples of soft sounds.
  • A
    Lawn mower
  • B
    Talking
  • C
    Thunder
  • ✓
    Rustling leaves
Answer
Correct option: D.
Rustling leaves
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MCQ 1541 Mark
Speed is:
  • ✓
    $\frac{\text{Distance Travelled}}{\text{Time}}$
  • B
    $\frac{\text{Time}}{\text{Distance Travelled}}$
  • C
    Distance Travelled $\times $ Time
  • D
    Time $\times $ Distance Travelled
Answer
Correct option: A.
$\frac{\text{Distance Travelled}}{\text{Time}}$
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MCQ 1551 Mark
Which of the following factor influence speed of sound most?
  • A
    Temperature
  • B
    Humidity
  • ✓
    Nature of medium
  • D
    Source of sound
Answer
Correct option: C.
Nature of medium
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MCQ 1561 Mark
Meradona was standing on the cliff, $825\ m$ from the point, from where the gun was fired. After how long he will hear the echo? Speed of sound is taken as $330m/ s.$
  • A
    $1$ sec
  • B
    $2$ sec
  • C
    $4$ sec
  • ✓
    $5$ sec
Answer
Correct option: D.
$5$ sec
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MCQ 1571 Mark
Which of the following statement is or are incorrect?
  • A
    Sound can travel through solids, liquids and gases.
  • B
    The sound of ringing telephone bell travels to us through the air in the room.
  • C
    Sound cannot travel through vacuum because vacuum has no molecules which can vibrate and carry sound waves.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
View full question & answer→
MCQ 1581 Mark
Cochlea is a part of $...........?$
  • ✓
    Hearing organ
  • B
    Sound producing organ
  • C
    Muscular organ
  • D
    Air pollution
Answer
Correct option: A.
Hearing organ
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MCQ 1591 Mark
A man fires a gun $150\ m$ from a cliff. A second man who is standing $300\ m$ further away from the cliff hears the gun $1$ second after he sees the flash. The second man will hear the echo from the cliff:
  • A
    $1$ second after seeing the flash.
  • B
    $2$ seconds after hearing the gun.
  • ✓
    $2$ seconds after seeing the flash.
  • D
    $4$ seconds after hearing the gun.
Answer
Correct option: C.
$2$ seconds after seeing the flash.
Echo will be heard when the sound of the gun gets reflected from the cliff, Thus the total distance travelled by the sound of gun, $S = x_1 + x_2 + x_3 = 150 + 150 + 300 = 600m v = 300m s^{−1}$
$\therefore\text{t}= \frac{\text{S}}{\text{U}}= \frac{600}{300}=\text{2s}$
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MCQ 1601 Mark
A pendulum oscillates $20$ times in $4$ seconds. Find its time period.
  • A
    $0.05$ sec.
  • B
    $0.001$ sec.
  • ✓
    $0.2$ sec.
  • D
    $0.1$ sec
Answer
Correct option: C.
$0.2$ sec.
View full question & answer→
MCQ 1621 Mark
Frequency $(ν)$ and time period $(T)$ are related as
  • ✓
    $V \times T = 1$
  • B
    $V/ T = 1$
  • C
    $V = T/ 2$
  • D
    $V = T2$
Answer
Correct option: A.
$V \times T = 1$

Frequency is the reciprocal of the time period.
So, frequency and time period are related as $\text{v}=\frac{1}{\text{T}}$
$\therefore V \times T = 1.$

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MCQ 1631 Mark
An object vibrates with a frequency of $15$ hertz. Which of the following is true:
  • A
    It produces sound that we can hear.
  • B
    It does not produce sound.
  • ✓
    It produces sound that we cannot hear.
  • D
    It produces sound that we can hear if we strain our ears.
Answer
Correct option: C.
It produces sound that we cannot hear.
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MCQ 1641 Mark
The sound above $...........$ is physically painful.
  • A
    $20dB$
  • B
    $40dB$
  • C
    $60dB$
  • ✓
    $80dB$
Answer
Correct option: D.
$80dB$
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MCQ 1651 Mark
Which of the following sound is $\text{NOT}$ a cause of noise pollution:
  • A
    Loud speaker
  • B
    Horn of vehicle
  • C
    Explosion
  • ✓
    Television
Answer
Correct option: D.
Television
Television has the lowest volume, out of the given, and it also doesn't disturb other people therefore generally it is not a cause of noise pollution.
Where other causes are generally very loud so they are the causes of noise pollution.
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MCQ 1661 Mark
A shehnai produces sound from:
  • A
    Vibrating strings
  • B
    Vibrating membrane
  • ✓
    Vibrating air column
  • D
    None of these
Answer
Correct option: C.
Vibrating air column
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MCQ 1681 Mark
If the amplitude of a sound is doubled, then its ?
  • A
    Velocity is doubled
  • B
    Frequency is doubled
  • C
    Wavelength is doubled
  • ✓
    None of the above
Answer
Correct option: D.
None of the above
The amplitude of a sound is independent of velocity, frequency, and wavelength.
So it can't be changed by changing any of them.
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MCQ 1691 Mark
Vibrating part of flute is:
  • ✓
    Air$-$column
  • B
    Rubber band
  • C
    String
  • D
    Stretched membrane
Answer
Correct option: A.
Air$-$column
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MCQ 1701 Mark
Eardrum is a part of:
  • A
    Sound producing organ.
  • B
    Skeletal system.
  • ✓
    Hearing organ.
  • D
    Reproductive organ.
Answer
Correct option: C.
Hearing organ.
View full question & answer→
MCQ 1721 Mark
Fill in the blanks with the most appropriate option.
If a guitar string is pulled strongly, its amplitude of vibration $..............$ and the note heard is $..............$ If it is pulled lightly, its amplitude of vibration $..............$ and the note heard is $..............$
  • A
    $(i)$ Increases, $(ii)$ Louder, $(iii)$ Increases, $(iv)$ Louder.
  • B
    $(i)$ Decreases, $(ii)$ Softer, $(iii)$ Decreases, $(iv)$ Softer.
  • ✓
    $(i)$ Increases, $(ii)$ Louder, $(iii)$ Decreases, $(iv)$ Softer.
  • D
    $(i)$ Decreases, $(ii)$ Softer, $(iii)$ Increases, $(iv)$ Louder.
Answer
Correct option: C.
$(i)$ Increases, $(ii)$ Louder, $(iii)$ Decreases, $(iv)$ Softer.
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MCQ 1731 Mark
When the amplitude is small, the sound produced is:
  • A
    Loud
  • ✓
    Feeble
  • C
    Low pitched
  • D
    None of these
Answer
Correct option: B.
Feeble
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MCQ 1741 Mark
The human ear can hear sounds having frequency in range:
  • A
    Between $200 - 20,000Hz$
  • B
    Between $20 - 2000Hz$
  • C
    Between $200 - 2000Hz$
  • ✓
    Between $20 - 20,000Hz$
Answer
Correct option: D.
Between $20 - 20,000Hz$
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MCQ 1751 Mark
Find the difference between a musical sound and noise.
  • A
    Amplitude
  • B
    Loudness
  • ✓
    Vibrations
  • D
    All of the above
Answer
Correct option: C.
Vibrations
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MCQ 1761 Mark
When the amplitude of vibration is large, sound produced is:
  • A
    No sound
  • B
    Feeble
  • ✓
    Loud
  • D
    No relation between amplitude and sound
Answer
Correct option: C.
Loud
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MCQ 1771 Mark
Speed of sound in solids is $...........$ the speed of sound in liquids.
  • A
    Same as
  • ✓
    Greater than
  • C
    Less than
  • D
    Sometimes greater and sometimes less than
Answer
Correct option: B.
Greater than
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MCQ 1781 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 can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound.
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MCQ 1791 Mark
Vibration is also known as:
  • A
    Vibratory motion
  • B
    Translatory motion
  • ✓
    Oscillatory motion
  • D
    None of these
Answer
Correct option: C.
Oscillatory motion
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MCQ 1801 Mark
To and fro or back and forth motion of an object is termed as $...........$
  • A
    Frequency
  • B
    Amplitude
  • ✓
    Vibration
  • D
    Time period
Answer
Correct option: C.
Vibration
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MCQ 1811 Mark
Frequency of oscillations is:
  • A
    The number of oscillations per minute
  • B
    The number of oscillations per hour
  • ✓
    The number of oscillations per second
  • D
    None of these
Answer
Correct option: C.
The number of oscillations per second
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MCQ 1821 Mark
The picture shows a xylophone. $A, B, C$ and $D$ are the rods in it. Which of the following rods has high pitch of the sound and which has low frequency of vibrations?
  • A
    High pitch - $D$, Low frequency - $A$
  • B
    High pitch - $C$, Low frequency - $B$ and $C$
  • C
    High pitch - $A$ and $D$, Low frequency - $A$ and $D$
  • ✓
    High pitch - $A$, Low frequency - $D$
Answer
Correct option: D.
High pitch - $A$, Low frequency - $D$

Pitch of sound depends on the frequency of vibrations. Smaller length vibrates faster, so the frequency increases and sound produced is of high pitch.

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MCQ 1831 Mark
Which of the following are used to study the growth of fetus inside the mother’s womb?
  • A
    Radio waves.
  • B
    $X-$rays.
  • ✓
    Infrared waves.
  • D
    Sound waves.
Answer
Correct option: C.
Infrared waves.
Infra$-$red Waves are used to study the growth of fetus inside the mother’s womb.
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MCQ 1851 Mark
The loudness of sound is determined by its:
  • ✓
    Amplitude of vibration.
  • B
    Ratio of amplitude and frequency of vibration.
  • C
    Frequency of vibration.
  • D
    Product of amplitude and frequency of vibration.
Answer
Correct option: A.
Amplitude of vibration.
Loudness of sound is determined by the amplitude of its vibration.
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MCQ 1861 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 1871 Mark
An ultrasound equipment works at frequency
  • A
     Higher than $20,000 \ Hz$
  • B
     Higher than $10,000 \ Hz$
  • ✓
     Lower than $20,000 \ Hz$
  • D
     Lower than $10,000 \ Hz$
Answer
Correct option: C.
 Lower than $20,000 \ Hz$
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MCQ 1881 Mark
Human can hear sound in the range of
  • A
    $ 200-2000 \ Hz$
  • ✓
    $ 20-20,000 \ Hz$
  • C
    $ 2-20000 \ Hz$
  • D
    $ 2000-200000 \ Hz$
Answer
Correct option: B.
$ 20-20,000 \ Hz$
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MCQ 1891 Mark
When the amplitude of vibration is large, sound produced is
  • A
     No sound
  • B
     feeble
  • ✓
     loud
  • D
     No relation between amplitude and sound
Answer
Correct option: C.
 loud
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MCQ 1901 Mark
Above$ ........... dB$ the sound becomes physically painful
  • A
    $ 60$
  • B
    $ 40$
  • C
    $ 120$
  • ✓
    $ 80$
Answer
Correct option: D.
$ 80$
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MCQ 1911 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 1931 Mark
Vibration is also known as
  • A
     Vibratory motion
  • B
     Translatory motion
  • ✓
     Oscillatory motion
  • D
     None of these
Answer
Correct option: C.
 Oscillatory motion
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MCQ 1951 Mark
Sound is produced by
  • A
     Non$-$Vibrating objects only
  • B
     Vibrating and non$-$ vibrating objects
  • C
     Vibration has no relation to sound
  • ✓
     Vibrating objects only
Answer
Correct option: D.
 Vibrating objects only
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MCQ 1961 Mark
The velocity of sound at $20^\circ C$ is approximately
  • A
    $3400\ m/sec.$
  • ✓
    $340\ m/sec.$
  • C
    $430\ m/sec$
  • D
    $304\ m/sec.$
Answer
Correct option: B.
$340\ m/sec.$
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MCQ 1971 Mark
The maximum displacement of a body from its mean position is called
  • ✓
    amplitude
  • B
    oscillation
  • C
    periodic motion
  • D
    frequency
Answer
Correct option: A.
amplitude
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MCQ 1981 Mark
The number of vibrations made by a vibrating body in one second is
  • ✓
    frequency
  • B
    noise
  • C
    loudness
  • D
    pitch
Answer
Correct option: A.
frequency
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MCQ 1991 Mark
Loudness of sound is determined by
  • A
    pitch
  • B
    frequency
  • ✓
    amplitude
  • D
    time period
Answer
Correct option: C.
amplitude
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MCQ 2001 Mark
A pendulum oscillates $20$ times in $4$ seconds. Find its time period.
  • A
    $0.05 \sec.$
  • B
    $0.001 \sec.$
  • ✓
    $0.2 \sec.$
  • D
    $0.1 \sec$
Answer
Correct option: C.
$0.2 \sec.$
View full question & answer→
MCQ 2011 Mark
Speed is
  • ✓
     Distancetravelle Time
  • B
     Time Distancetravelled
  • C
    Distance travelled $\times $ Time
  • D
    Time $+$ Distance travelled
Answer
Correct option: A.
 Distancetravelle Time
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MCQ 2021 Mark
The sound in the audible range is called
  • A
    ultrasonic sound
  • ✓
    sonic sound
  • C
    subonic sound
  • D
    light sound
Answer
Correct option: B.
sonic sound
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MCQ 2041 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
View full question & answer→
MCQ 2051 Mark
Cochlea is a part of
  • ✓
    hearing organ
  • B
    sound producing organ
  • C
    muscular organ
  • D
    air pollution
Answer
Correct option: A.
hearing organ
View full question & answer→
MCQ 2061 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 2081 Mark
The hearing range of human ear is
  • ✓
    $20\ Hz$ to $20,000\ Hz$
  • B
    less than $20\ Hz$
  • C
    more than $20,000\ Hz$
  • D
    $20\ Hz$ to $25,000\ Hz$
Answer
Correct option: A.
$20\ Hz$ to $20,000\ Hz$
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