M.C.Q. [I MARKS]

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 81 Mark

In which medium does sound travel fastest:

A
Air
B
Water
✓
Steel
D
Vacuum

Answer

Correct option: C.

Steel

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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.

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MCQ 131 Mark

Noise pollution is harmful for:

A
Human
B
Cat
C
Bird
✓
All

Answer

Correct option: D.

All

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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 211 Mark

Sound is caused by$...........?$

A
Instruments
✓
Vibrations
C
Force
D
Volume

Answer

Correct option: B.

Vibrations

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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 261 Mark

Sound is a kind of:

A
Work
✓
Energy
C
Force
D
Pressure

Answer

Correct option: B.

Energy

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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 421 Mark

We hear sounds when they enter to our$...........?$

✓
Ears
B
Eyes
C
Eose
D
Mouth

Answer

Correct option: A.

Ears

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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 491 Mark

A loud sound is called $...........?$

✓
Noise
B
Heavy
C
Vibration
D
Eyas

Answer

Correct option: A.

Noise

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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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