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24 questions · timed · auto-graded

MCQ 11 Mark
The sound waves travel faster ______.
  • A
    in liquids
  • B
    in gases
  • C
    in solids
  • D
    in vacuum
Answer
The sound waves travel faster in solids.
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MCQ 21 Mark
The maximum speed of vibrations which produces audible sound will be in ______.

  • seawater

  • ground glass

  • dry air

  • Human blood

  • A
    seawater
  • B
    ground glass
  • C
    dry air
  • D
    Human blood
Answer
The maximum speed of vibrations which produces audible sound will be in seawater.
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MCQ 31 Mark
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
  • A
    wax
  • B
    vacuum
  • C
    water
  • D
    empty vessel
Answer
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through empty vessel.
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MCQ 41 Mark
Sound travels in air:
  • A
    if there is no moisture in the atmosphere.
  • B
    if particles of medium travel from one place to another.
  • C
    if both particles as well as disturbance move from one place to another.
  • D
    if disturbance moves.
Answer
if particles of medium travel from one place to another.
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MCQ 51 Mark
Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?
  • A
    stretched strings
  • B
    stretched membranes
  • C
    air columns
  • D
    metal plates
Answer
stretched strings
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MCQ 61 Mark
The speeds of sound in four different media are given below. Which of the following is the most likely speed in ms-1 with which the two underwater whales in a sea can talk to each other when separated by a large distance?
  • A
    5170
  • B
    1280
  • C
    340
  • 1530
Answer
Correct option: D.
1530
1530
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MCQ 71 Mark
Sonar is a device that uses to measure the distance, direction and speed of the underwater objects.
  • A
    radio waves
  • B
    infrared waves
  • C
    water waves
  • ultrasonic waves
Answer
Correct option: D.
ultrasonic waves
ultrasonic waves
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MCQ 81 Mark
The frequency of source of sound is 60 Hz. Then the number of vibrations in a minute will be ………………..
  • A
    36
  • B
    360
  • 3600
  • D
    6000
Answer
Correct option: C.
3600
3600
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MCQ 91 Mark
The part of ear that turns pressure variations into electrical signals is .
  • A
    the hammer
  • B
    anvil
  • cochlea
  • D
    stirrup
Answer
Correct option: C.
cochlea
cochlea
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MCQ 101 Mark
To hear an echo, the minimum distance of the obstacle from the source of sound must be ………………
  • A
    34 m
  • 17 m
  • C
    340 m
  • D
    170 m
Answer
Correct option: B.
17 m
17 m
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MCQ 111 Mark
The elastic property of medium is a factor of …………. medium.
  • A
    gas
  • B
    liquid
  • solid
  • D
    none of these
Answer
Correct option: C.
solid
solid
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MCQ 121 Mark
The speed of sound in a gaseous medium depends on …………….
  • A
    pressure
  • B
    temperature
  • C
    density
  • all of these
Answer
Correct option: D.
all of these
all of these
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MCQ 131 Mark
SI unit of wavelength is ……………………………..
  • A
    Hertz
  • B
    metre per second
  • C
    decibel
  • metre
Answer
Correct option: D.
metre
metre
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MCQ 141 Mark
The relation between speed, frequency and wavelength is ………………
  • A
    (V=\frac{v}{\lambda}$
  • B
    (V =\frac{\lambda}{\gamma}$
  • C
    (V =\gamma \lambda$
  • D
    (V =\frac{1}{\gamma}$
Answer
(V=\gamma \lambda$
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MCQ 151 Mark
When temperature increases the speed of sound
  • increases
  • B
    decreases
  • C
    remains same
  • D
    none of these
Answer
Correct option: A.
increases
increases
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MCQ 161 Mark
The distance between two adjacent crest is called …………………..
  • A
    amplitude
  • wavelength
  • C
    time period
  • D
    frequency
Answer
Correct option: B.
wavelength
wavelength
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MCQ 171 Mark
Sound travels in air as ……………..wave.
  • longitudinal
  • B
    transverse
  • C
    electromagnetic
  • D
    all of these
Answer
Correct option: A.
longitudinal
longitudinal
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MCQ 181 Mark
………………. is a general term for the distinguishable characteristic of wave
  • A
    Pitch
  • B
    Amplitude
  • C
    Frequency
  • Timbre
Answer
Correct option: D.
Timbre
Timbre
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MCQ 191 Mark
of sound depends on the amplitude of the wave,
  • Loudness
  • B
    Pitch
  • C
    Timbre
  • D
    Tone
Answer
Correct option: A.
Loudness
Loudness
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MCQ 201 Mark
The frequency greater than 20,000 Hz is ………………. sound.
  • A
    infrasonic
  • ultrasonic
  • C
    audible
  • D
    sonic
Answer
Correct option: B.
ultrasonic
ultrasonic
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MCQ 211 Mark
Human beings cannot hear …………………
  • A
    infrasonic sound
  • B
    sonic sound
  • C
    ultrasonic sound
  • a & c
Answer
Correct option: D.
a & c
a & c
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MCQ 221 Mark
In longitudinal waves, the particle vibrates in a ………………….. direction of propagation.
  • A
    parallel
  • perpendicular
  • C
    curved
  • D
    all of these
Answer
Correct option: B.
perpendicular
perpendicular
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MCQ 231 Mark
Sound cannot travel through …………………
  • A
    darkness
  • B
    gases
  • vacuum
  • D
    all of these
Answer
Correct option: C.
vacuum
vacuum
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MCQ 241 Mark
Which of the following is a non-mechanical wave?
  • A
    sound
  • B
    water
  • light
  • D
    none of the above
Answer
Correct option: C.
light
light
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MCQ - Science STD 9 Questions - Vidyadip