CBSE Questions for Class 8 Physics Sound Quiz 11 - MCQExams.com

Sound is produced due to:
  • friction
  • vibration
  • circulation
  • refraction
What is the commonly stated human hearing frequency range?
  • $$10\ Hz$$ to $$20\ kHz$$
  • $$20\ Hz$$ to $$20\ kHz$$
  • $$40\ Hz$$ to $$20\ kHz$$
  • $$30\ Hz$$ to $$20\ kHz$$

Three different vibrating bodies produce three types of sounds X, Y and Z. Sounds X and Y cannot be heared by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in for monitoring nuclear reactor.Y is sound similar to that which is produced during an earthquake before the main shock wave is generated. What type of sounds are (i) X (ii) Y, and (iii) Z?
  • X-infrasound

    Y-ultrasound

    Z- audible sound
  • X-audible sound

    Y-infrasound

    Z-ultrasound
  • X-ultrasound

    Y-infrasound

    Z-audible sound
  • X-infrasound

    Y-audible sound

    Z-audible sound
Sound of different pitch can be produced using a flute. How?
  • If we blow a flute, the air column vibrates and produces sound
  • If we blow a flute, the body of the flute vibrates and produces sound
  • Both A and B
  • None of these
Mark the incorrect difference between musical sound and noise
  • Musical sound is a periodic disturbance whereas noise is non-periodic disturbance
  • A musical sound has no sudden change in amplitude or loudness whereas noise has very often, irregular sudden changes in amplitude or loudness or both
  • Musical sound has no sense of continuity whereas reverse is true for noise
  • None
What does noise comprises of?
  • Low Frequency, Irregular waveform and sudden changes in amplitude or wavelength
  • High Frequency, Irregular waveform and sudden changes in amplitude or wavelength
  • Low Frequency, regular waveform and sudden changes in amplitude or wavelength
  • Low Frequency, Irregular waveform and No sudden changes in amplitude or wavelength
We find it difficult to hear if we put cotton in our ears. This is because
  • cotton damps the sound wave before reaching the ear drum
  • cotton creates a vacuum in the ear
  • cotton conducts the vibration to the ear drum
  • none of the above is true

Which of the following measure can be taken to control noise pollution in our surroundings.
  • by using silencers in vehicles
  • planting trees
  • using noise mufflers
  • all
In which of the following speed of sound is maximum?
  • Air
  • Water
  • Steel
  • Kerosene
Which of the following statements supports the fact that sound requires a material medium to pass through?
  • We do not hear the sound of explosions occurring in Sun
  • Rings of an electric bell put within a vacuumed jar can not be heard
  • If we put one ear on an iron rod and hit on it, we hear two sounds simultaneously
  • All of these
One sound wave strikes a person's ear every 1/100 of second. The speed of the sound where the person is located is 345 m/s. What is the frequency of the sound?
  • 3.45 Hz
  • 34.500 Hz
  • 0.01 Hz
  • 100 Hz
  • 2.9 Hz
One sound wave strikes a person's ear every $$1/100$$ of a second. The speed of sound where the person is located is $$345 m/s$$.
What is the frequency of the sound?
  • $$3.45\ Hz$$
  • $$34,500\ Hz$$
  • $$0.01\ Hz$$
  • $$100\ Hz$$
  • $$2.9\ Hz$$
A tuning fork of frequency 420 Hz completes 70 vibrations. Find the distance travelled by sound in air (v = 360 m $$s^{-1})$$
  • 20 m
  • 50 m
  • 60 m
  • 80 m
Match the following and choose the correct answer.
AString vibration1Tabla
BMembrane vibration2Bicycle bell
CVibration of air3Sitar
DVibration of plate4Flute
  • A-1, B-2, C-3, D-4
  • A-2, B-1, C-4, D-3
  • A-3, B-1, C-4, D-2
  • A-4, B-3, C-2, D-1
A shrill sound has a_______pitch and a dull sound has a___________pitch.
  • High, low
  • Low, high
  • Low, low
  • High, high
Loudness of sound increases with:
  • The amplitude of vibrating body
  • The increase in surface area of vibrating body
  • The decrease in frequency of vibrating body
  • The increase in distance from the source of sound
A vibrating body
  • Will always produce sound
  • May or may not produce sound if the amplitude of vibration is low
  • Will produce sound which depends upon frequency
  • None of the above
Choose the correct statements (s) from the following?
  • Mechanical waves need medium for their propogation
  • Sound cannot travel through vaccum
  • Mechanical waves transport energy from one place to another
  • Sound waves are non mechanical waves
Longitudinal waves cannot travel through
  • Vacuum
  • Solids
  • Liquids
  • Gases
In violin there is part which  is used to adjust the string for getting right pitch. What is the name of that part?
  • Tuning peg
  • Volute
  • Finger board
  • Neck
The grandparents and parents of a two-year-old girl are playing with her in a room. A sound source produces a $$28\ kHz$$ sound. Who in the room is most likely to hear the sound?
  • Grandparent
  •  Little girl
  • Both
  • None of them
Which of the following is the vibrating part of a Saxophone?
  • Stretched -Membrane
  • Stretch-String
  • Air column
  • None of the above
Name the instruments for which more than one part is responsible for the production of sound.
  • Tabla
  • Violin
  • Guitar
  • All of the above
Tuning fork causes them to vibrate and produce sound. This is due to:
  • The two metal prongs of that tuning fork
  • The length of the prongs of that tuning fork
  • The speed of the molecules hit the tuning fork
  • Both $$A$$ and $$B$$
Which of the following vibrating parts of instrument is not matched with the respective instrument?
  • Drum- Stretched Membrane
  • Tabla - Stretched Membrane
  • Mridangam - Stretched Membrane
  • None of the above
A chain of hydrogen bombs is being exploded every time in the sun due to the fusion process, yet you do not hear the sound, because.
  • The sound so generated is absorbed by various layers of the sun
  • The sound so generated dissipates away
  • The sun is very far away
  • The space between the sun and the earth is void
When we hear a sound, we can identify it source from:
  • The frequency of the sound
  • The amplitude of the sound
  • The wavelength of the sound
  • The overtones present in the sound
An empty vessel produces louder sound than a filled one because.
  • The liquid in the filled vessel absorbs the vibrations of the liquid molecules
  • The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel
  • The density of air is less than the density of liquid contained in the vessel when filled
  • The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column
The amplitude of vibratory motion is measured in units of 
  • length
  • time
  • speed
  • Hz
If A is the amplitude of vibration, then the time taken by a wave to cover a distance of 4A is known as
  • Time period
  • Half the time period
  • 1 s
  • 0.1 s
0:0:1


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