Download App

Science M.C.Q. [I MARKS]

Sound · CBSE STD 8 (CBSE - English Medium). 210 questions.

Questions · Page 2 of 5

M.C.Q. [I MARKS]

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
View full question & answer→
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
View full question & answer→
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 $20000 \ Hz.$

View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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 $10^{−9}m.$
View full question & answer→
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.
View full question & answer→
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
View full question & answer→
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
View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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
View full question & answer→
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 $(dB)$
View full question & answer→
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.
View full question & answer→
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.
$500 \ Hz$
View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
MCQ 701 Mark
Sounds can be $...........$ or $...........?$
  • A
    high$-$low
  • B
    up$-$down
  • ✓
    loud$-$soft
  • D
    loud$-$high
Answer
Correct option: C.
loud$-$soft
View full question & answer→
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
View full question & answer→
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.
View full question & answer→
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
$\therefore \text{2x}=346 \times 0.5$
$\text{or} \text{ x}= \frac{346 \times 0.5 }{2}= \text{86.5m.}$
View full question & answer→
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.
View full question & answer→
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 $20 \ Hz$
View full question & answer→
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 $20,000 \ Hz$
View full question & answer→
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
View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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.
$20\ mm$
View full question & answer→
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
View full question & answer→
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 $20,000 \ Hz$
View full question & answer→
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 $= 1/ 0.5 = 2s.$

View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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
View full question & answer→
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.

View full question & answer→
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.
View full question & answer→
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
View full question & answer→
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$=\frac{1}{\text{50}}=0.02 \ \text{s}$

View full question & answer→
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.
View full question & answer→
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.
View full question & answer→
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
View full question & answer→
Generate Paper FreeAll Sound topics