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Sound Test - 3

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Sound Test - 3
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following will remain unchanged when a sound wave travels in air or in water?
    Solution
    Wavelength will remain unchanged when a sound wave travels in air or in water.
  • Question 2
    1 / -0
    The sound intensity level of an ordinary conversation at 50 cm is nearly:
    Solution

    The sound intensity level for ordinary conversation at 50 cm is nearly 65 db.

  • Question 3
    1 / -0
    The sound carried by air from a sitar to a listener is a wave of following type
    Solution

    The sound carried by air from a sitar to a listener is a wave of longitudinal progressive wave, as the listener receives sound waves (music) which are longitudinal progressive waves.

  • Question 4
    1 / -0
    If the intensity of sound is doubled, the sound level will increase nearly by
    Solution
    10 log10(2) = 3 db
  • Question 5
    1 / -0
    Intensity or loudness depends upon which of the following factors?
  • Question 6
    1 / -0
    The S.I unit of intensity of sound wave is
  • Question 7
    1 / -0
    When a wave is refracted,
  • Question 8
    1 / -0
    Two sound waves having two sinusoidal waveforms, but different wavelength and amplitude, are said to have
    Solution

    Option (2)
    Since the two waves have different amplitudes, therefore, they will have different intensities as the pitch depends upon the frequency of the source, while quality depends on the number of harmonics and their relative intensity.

  • Question 9
    1 / -0
    At STP the velocity of sound is minimum in
  • Question 10
    1 / -0
    For 10 F rise in temp, the velocity of sound in air increases nearly by
  • Question 11
    1 / -0
    A sound wave reflected at the boundary will undergo a phase change on reflection at
    Solution
    A sound wave, reflected at the boundary, will undergo a phase change on reflection at denser boundary. In the metals, speed of the sound is more as compared to the speed of sound in air, so air will act as a denser medium. Sound waves in a solid experience a phase reversal when they reflect from a metal-air boundary.

  • Question 12
    1 / -0
    When sound travels through air, the temperature
  • Question 13
    1 / -0
    The velocity of sound in an ideal gas is dependent on change in
    Solution
    The velocity of sound in an ideal gas is dependent on change in temperature. It has very weak dependence on pressure, density and frequency.
  • Question 14
    1 / -0
    A stone is dropped in a lake by a person from a tower 500 m high. The sound of splash will be heard by the man after approximately, (speed of the sound in air is 340 m/s , g =10m/s2)
    Solution
  • Question 15
    1 / -0
    A transverse wave travels along the z-axis. The particles of the medium must move
  • Question 16
    1 / -0
    Velocity of sound in a gas varies with pressure (p) as
    Solution
    At constant temperature, gas pressure has no effect on speed of sound, because pressure and density have equal but opposite effects on speed of sound, and the two ontributions cancel out exactly.
  • Question 17
    1 / -0
    A man hears the sound of lightning after 6 seconds. The distance of the cloud from the man is
    Solution
    Distance = Speed x Time
    Speed of sound in air = 331.5 m/s
    So, distance = 1989 m = 1.98 km
  • Question 18
    1 / -0
    Speed of sound in air is 332 m/s at STP. The speed of sound in hydrogen at STP will be
  • Question 19
    1 / -0
    At what temperature will the velocity of sound in air be 3 times of its value at 00 C?
  • Question 20
    1 / -0
    Velocity of sound in a gas does not depend upon
  • Question 21
    1 / -0
    The equation y = a cos2 (2 π nt - 2 π x / ) represents a wave with
  • Question 22
    1 / -0
    A wave is represented by x = 0.4 cos (8 t - y /2) where x & y in meters & t in sec. The speed of the wave is
  • Question 23
    1 / -0
    A wave is represented by the equation y = 0.5 sin (10 t + x) meter. It is a traveling wave propagating along + x direction with velocity
  • Question 24
    1 / -0
    The equation of a wave is represented by y = 10 – 4 sin (100 t – x /10)m, then the velocity of a wave will be
    Solution

    = 100

    k = 0.1

    So, v = 1000 m/s

  • Question 25
    1 / -0
    Decibel is the unit of
    Solution

    Decibel is the unit of sound loudness.
    Decibel (dB) is used to measure sound levels. It is also widely used in electronics,communication and signals.
    A decibel is the unit to express the ratio between two amounts of electric or acoustic power or for measuring the relative loudness of sounds.

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