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Sound Test - 63

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Sound Test - 63
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which property in a medium changes, when a longitudinal wave passes through it
    Solution
    The longitudinal waves are called pressure waves because propagation of longitudinal waves through a medium involves changes in pressure and volume of air, when compression and rarefaction are formed.

    The pressure in a medium varies as a longitduinal wave passes through the medium.

    The correct answer is (a)
  • Question 2
    1 / -0
    Assertion - Sound wave is an example of longitudinal wave.
    Reason - In longitudinal waves, the constituents of the medium oscillate perpendicular to the direction of wave propagation.
    Solution
    A sound wave is an example of the longitudinal wave.
    But in longitudinal waves, the constituents of the medium oscillate parallel to the direction of wave propagation. So sound wave is an example of longitudinal wave.
  • Question 3
    1 / -0
    A longitudinal wave is a wave that consists of oscillations that are 
    Solution
    A longitudinal wave is a wave that consists of oscillations that are perpendicular to the direction of wave propagation

    The correct option is (b)

  • Question 4
    1 / -0
    A transverse wave is a wave that consists of oscillations that are 
    Solution
    A transverse wave is a wave that consists of oscillations that are perpendicular to the direction of wave propagation.

    The correct option is (b)

  • Question 5
    1 / -0
    The terms pitch, quality and loudness of sound are associated with the following, respectively-
    Solution
    Given :The terms pitch, quality and loudness of sound are associated with the following, respectively-

    Solution :
    The pitch of a sound is our ear’s response to the frequency of the sound waves.  The pitch is the reason behind the shrillness invoices of different individuals.

    The quality or timbre of a sound is that characteristic that enables us to distinguish one sound from another having the same pitch and loudness. It depends upon the waveform of the sound.  

    The loudness of a sound is determined by its amplitude. 

    So, 
    • pitch is associated with $$\rightarrow$$ frequency
    • quality is associated with $$\rightarrow$$ waveform
    • loudness is associated with $$\rightarrow$$ amplitude
  • Question 6
    1 / -0
    The tip of a pencil attached to a spring oscillates vertically, thereby etching an overlapping straight line on a white sheet of paper. The length of this line is $$5 \ cm$$. What is the amplitude of the vibration
    Solution
    The line length gives the distance between two extremes = twice the amplitude of the vibration. Thus, amplitude of vibration $$= \dfrac{5}{2} = 2.5 \  cm$$

    The correct option is (C)
  • Question 7
    1 / -0
    The maximum displacement of a particle in a vibratory motion is known as 
    Solution
    As seen in above figure the maximum displacement of a particle from it's mean position in a vibratory motion is known as amplitude.

    The correct option is (c)

  • Question 8
    1 / -0
    A sound wave has a speed of 200 m/s in a medium and it travels a distance of 1 m. What is the time taken by the wave to cross the medium
    Solution
    We know that wave velocity = distance/Time taken
    $$200= 1/t  \implies t = 1/200 = 0.005 s$$

    The correct option is (d)
  • Question 9
    1 / -0
    A particle takes 0.01 s to complete 5 vibrations, what is its frequency
    Solution
    Given:
    Number of vibration = $$5$$
    Time $$t=0.01\ s$$
    Frequency=$$\dfrac{\text{Number of vibration}}{\text{Time}}=\dfrac{5}{0.01} = 500 Hz$$

    The correct option is (d)
  • Question 10
    1 / -0

    Directions For Questions

    Ultrasonic and Infrasonic Waves: The sound having frequency between $$20$$ Hz to $$20$$ kHz is called audible sound. Human ear cannot hear sound of frequencies lying outside this range. The limits of audibility of sound vary from individual. Generally the upper limit decreases with increase of age of individual; usually and people can not hear sound of frequency more than $$15$$ kHz.
    Sound of frequencies below $$20$$ Hz are called infrasonics, while frequencies beyond $$20$$ kHz are called ultrasonics. Ultrasonics can be heard by dogs, cat, bats, etc. Bats detect the path by means of ultrasonics. Ultrasonics can be used for diagnosis of turnover and other abnormalities within our body. This is known as ultrasonography. Ultrasonics are used to cure various diseases and to measure depth of oceans to detect submarines.

    ...view full instructions

    Ultrasonics can be detected by:
    Solution
    Ultrasonic sound can be detected by Bats. They use ultrasonic waves to navigate and find insect prey.

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