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Science M.C.Q. [1 M]

Sound · Bihar Board (BSEB) STD 9 (BSEB - English Medium). 29 questions.

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M.C.Q. [1 M]

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29 questions · timed · auto-graded

MCQ 11 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 wave in air is independent of its frequency.
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MCQ 21 Mark
The sound waves travel fastest:
  • ✓
    In solids.
  • B
    In liquids.
  • C
    In gases.
  • D
    In vacuum.
Answer
Correct option: A.
In solids.
Velocity of the longitudinal wave is directly proportional to the density of the medium.
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MCQ 31 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.
$1530$
The speed of water in sound is $1530\ m/s$.
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MCQ 41 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.
Sound waves cannot propagate through vacuum.
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MCQ 51 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.
The metal plates vibrate when a musical note is produced by the cymbals.
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MCQ 61 Mark
What type of waves are generated by $SONAR$ device fixed to a fishing ship?
  • A
    Water waves.
  • B
    Radio waves.
  • ✓
    Sound waves.
  • D
    Infrared waves.
Answer
Correct option: C.
Sound waves.
$SONAR$ uses ultrasonic sound waves.
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MCQ 71 Mark
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish $0.4\ s$ after it was sent. If the speed of sound in water is $1500\ m/s$, how deep is the shoal?
  • A
    $150\ m$
  • ✓
    $300\ m$
  • C
    $600\ m$
  • D
    $7500\ m$
Answer
Correct option: B.
$300\ m$
Time taken to list the sent signal is $0.4\ s$.
Speed of sound in water is $1,500\ m/s$.
So,
$=\frac{1500\times0.4}{2}$
$=300\text{m}$
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MCQ 81 Mark
When we change a feeble sound to a loud sound, we increase its:
  • A
    Frequency.
  • ✓
    Amplitude.
  • C
    Velocity.
  • D
    Wave length.
Answer
Correct option: B.
Amplitude.
Loudness: if a sound is directly proportional to its amplitude.
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MCQ 91 Mark
Which of the following device does not work on the multiple reflections of sound waves?
  • A
    Stethoscope.
  • ✓
    Hydrophone.
  • C
    Soundboard.
  • D
    Megaphone.
Answer
Correct option: B.
Hydrophone.
Hydrophone does not work on the principle of multiple reflections.
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MCQ 101 Mark
At $20^\circ\ C$, the minimum distance of a person from a sound reflecting surface to hear an echo is:
  • A
    $12.2\ m$
  • ✓
    $17.2\ m$
  • C
    $15.2\ m$
  • D
    $34.4\ m$
Answer
Correct option: B.
$17.2\ m$
At room temperature, the minimum distance for echo is $17.2\ m$.
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MCQ 111 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.
A sitarist tries to adjust the tension in the strings as to adjust the frequency of sitar with the frequency of other musical instruments.
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MCQ 121 Mark
We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called:
  • A
    Frequency.
  • B
    Timbre.
  • ✓
    Pitch.
  • D
    Loudness.
Answer
Correct option: C.
Pitch.
We can distinguish between the sounds of different singer by their pitch.
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MCQ 131 Mark
When the pitch of note produced by a harmonium is lowered, then the wavelength of the note:
  • A
    Decreases.
  • B
    First decreases and then increases.
  • ✓
    Increases.
  • D
    Remains the same.
Answer
Correct option: C.
Increases.
When the pitch of the harmonium is lowered, then the frequency is also lowered. Wavelength is inversely proportional to the frequency.
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MCQ 141 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.
Velocity of the longitudinal wave is directly proportional to the density of the medium.
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MCQ 151 Mark
If the speed of a wave is $340\ m/s$ and its frequency is $1700\ Hz$, then $\lambda$ for this wave in $cm$ will be:
  • A
    $2$
  • B
    $0.2$
  • ✓
    $20$
  • D
    $200$
Answer
Correct option: C.
$20$
Given: Velocity of the wave $= 340\ m/s$
Frequency of the wave $= 1,700\ Hz$
So, we can find the wavelength by $\lambda=\frac{\text{v}}{\text{f}},$
Where $\lambda$ is the wavelength, $v$ the velocity, and $f$ the frequency.
So,
$\lambda=\frac{340}{1700}\text{m}$
$=20\text{cm}$
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MCQ 161 Mark
‘Note’ os a sound:
  • A
    Of a mixture of several frequencies.
  • B
    Of mixture of only two frequencies.
  • ✓
    Of a single frequency.
  • D
    Always unpleasant to listen to.
Answer
Correct option: C.
Of a single frequency.
Note is a sound of single frequency.
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MCQ 171 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 wavelength.
  • D
    Very high amplitude.
Answer
Correct option: B.
Very high frequency.
Ultrasound waves can enter the metal surfaces because of their high frequency.
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MCQ 181 Mark
Which one of the following does not consist of transverse waves?
  • A
    Light emitted by a $CFL$.
  • B
    $TV$ signals from a satellite.
  • C
    Ripples on the surface of a pond.
  • ✓
    Musical notes of an orchestra.
Answer
Correct option: D.
Musical notes of an orchestra.
The waves produced by musical instruments are longitudinal in nature.
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MCQ 191 Mark
In the sound wave produced by a vibrating turning fork shown in the diagram, half the wavelength is represented by: 
  • A
    $AB$
  • ✓
    $BD$
  • C
    $DE$
  • D
    $AE$
Answer
Correct option: B.
$BD$
The distance between successive trough and crest is half the wavelength.
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MCQ 201 Mark
Which of the following can produce longitudinal waves as well as transverse waves under different conditions?
  • A
    Water.
  • B
    $TV$ transmitter.
  • ✓
    Slinky.
  • D
    Tuning fork.
Answer
Correct option: C.
Slinky.
Slinky can produce longitudinal as well as transverse waves.
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MCQ 211 Mark
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method?
  • A
    $15,000$$Hz$
  • B
    $10$$kHz$
  • ✓
    $50$$kHz$
  • D
    $10,000$$Hz$
Answer
Correct option: C.
$50$$kHz$
Depth of sea can be measured using ultrasonic waves.
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MCQ 221 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
    $5kHz$
  • B
    $25Hz$
  • ✓
    $10Hz$
  • D
    $15,000Hz$
Answer
Correct option: C.
$10Hz$
Rhinoceros can produce infrasonic sound waves.
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MCQ 231 Mark
Which kind of sound is produced in an earthquake before the main shock wave begins?
  • A
    Ultrasound.
  • ✓
    Infrasound.
  • C
    Audible sound.
  • D
    None of the above.
Answer
Correct option: B.
Infrasound.
Infrasonic waves are formed before the major shock of earthquake.
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MCQ 241 Mark
Which of the following statement best describe frequency?
  • A
    The maximum disturbance caused by a wave.
  • ✓
    The number of complete vibrations per second.
  • C
    The distance between one crest of a wave and the next one.
  • D
    The distance travelled by a wave per second.
Answer
Correct option: B.
The number of complete vibrations per second.
Frequency is defined as number of complete vibrations per second.
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MCQ 251 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 luder 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.
By pressing the key gently and then again by, some force, increasing the amplitude of the wave, but the frequency remains the same.
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MCQ 261 Mark
Sound travels in air:
  • A
    If particles of medium travel from one place to another.
  • B
    If there is no moisture in the atmosphere.
  • ✓
    If disturbance moves.
  • D
    If both, particles as well as disturbance move from one place to another.
Answer
Correct option: C.
If disturbance moves.
Sound is a longitudinal wave in which the disturbance created by the vibrating body is carried out by the medium without the actual movement of the medium particles.
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MCQ 271 Mark
One of the following can hear infrasound. This one is:
  • A
    Dog.
  • B
    Bat.
  • ✓
    Rhinoceros.
  • D
    Humans.
Answer
Correct option: C.
Rhinoceros.
Rhinoceros can hear infrasonic sounds.
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MCQ 281 Mark
The velocities of sound waves in four media $P$. $Q, R$ and $S$ are $18,000\ km/h, 900\ km/h, 0\ km/h,$ and $1200\ km/h$ respectively. Which medium could be a liquid substance?
  • A
    $P$
  • B
    $Q$
  • C
    $R$
  • ✓
    $S$
Answer
Correct option: D.
$S$
Velocity of sound in liquid medium is intermediate to the velocities in solid and gas medium.
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MCQ 291 Mark
In $SONAR$ we use:
  • ✓
    Ultrasonic waves.
  • B
    Infrasonic waves.
  • C
    Radio waves.
  • D
    Audible sound waves.
Answer
Correct option: A.
Ultrasonic waves.
$SONAR$ uses ultrasonic sound waves.
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M.C.Q. [1 M] - Science STD 9 Questions - Vidyadip