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Sound Test - 30

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Sound Test - 30
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Weekly Quiz Competition
  • Question 1
    1 / -0
    A loaded spring produces __________ waves.
    Solution
    In longitudinal wave motion, the particles in the medium travel parallel to the direction of propagation of wave. 

    In the given case, since the loaded spring applies force only in axial direction of the spring, hence the movement is also axial so the waves produced are longitudinal waves.

    So the answer is B.

  • Question 2
    1 / -0
    Which of the following cannot travel through vacuum?
    Solution
    Light waves, heat waves, X-rays are examples of electromagnetic waves, which do not require any medium for their propagation.
    Sound waves cannot travel through a vacuum. It needs a material medium for its propagation. Sound waves can propagate only when the vibrational energy of the particles of the medium is travelling from one point to another.
  • Question 3
    1 / -0
    A bomb explodes on the moon. How long will it take for the sound to reach the earth?
    Solution

    Hint: Sound is a mechanical wave and need a medium to propagate.

    Explanation:

    Sound is a mechanical wave and hence it needs a medium to propagate and the outer space has vacuum and therefore if a bomb explodes on the moon its sound will never reach the Earth.

    Thus, Option (D) is correct.

     

  • Question 4
    1 / -0
    A boy stands $$85\ m$$ in front of a high wall and then blows a whistle. Calculate the time interval when he hears an echo. (speed of sound $$=340\ ms^{-1})$$
    Solution
    Given,
    Distance of the wall from the boy, $$d=85\ m$$
    Speed of sound, $$v=340\ m/s$$
    Time, $$t$$

    Distance travelled by the sound, $$D=2d$$
    $$D=2\times 85$$
    $$D=170\ m$$

    We know,
    Speed, $$v=\dfrac dt$$

    $$\implies t=\dfrac dv$$

    $$t=\dfrac{340}{170}$$

    Time, $$t=0.5\ s$$
  • Question 5
    1 / -0
    Echo is a type of
    Solution
    echo is a type of reflection of sound it is produced when source and reflecting surface is more than 17m apart.
    so the answer is A.
  • Question 6
    1 / -0
    Sound cannot travel through
    Solution
    Vacuum is defined as the empty space in which there are no matter particles present. As sound is a mechanical wave, in order to propagate material medium is required. Sound cannot travel through vacuum as there is no particles present for vibrations to take place.
    So the answer is C.
  • Question 7
    1 / -0
    Which of the following statements is true?
    Solution
    Sound is a mechanical wave in which the medium particles oscillate about their mean position and helps in the propagation of the distubance/wave. 
    Light being an electromagnetic wave doesn't require any medium for its propagation. The oscillations in a light wave are of magnetic and electric fields which are not of particle nature.

    So the answer is option C.
  • Question 8
    1 / -0
    ________ is the characteristic of a musical sound by a which a loud sound can be distinguished from a faint sound even though both have the same pitch.
    Solution
    If two sounds have same frequency then they will have same pitch but they can be distinguished by loudness since the faint sound will have low amplitude and loud sound will have high amplitude.
    So the answer is A. 
  • Question 9
    1 / -0
    Two tuning forks A, B vibrate with frequencies in the ratio 2 : 7 and their wavelengths in the ratio 3 : 4 respectively. The tuning fork A produces relatively :
    Solution
    Basically, we see that :
    1.)  Low Frequency $$\implies$$  Low Pitch and that implies Flat Sound.
    2.) High Frequency $$\implies$$  High Pitch and that implies Shrill Sound.
    Now, According to this question, Tuning Fork  $$A$$  has a Lower Frequency than  $$B$$.
    $$\implies$$  $$A$$  has more Flat Sound than  $$B$$
    Louder or Softer depends on the Amplitude of the wave, nothing can be commented on from knowing frequency or wavelength. 
    $$\implies$$ option B is correct.
  • Question 10
    1 / -0
    A longitudinal wave travels into a medium in which its speed increases. Its wavelength
    Solution
    The speed of wave is given by
    $$v = \nu \lambda$$
    As the frequency of a longitudinal wave is dependent on the frequency of the vibrations that lead to the creation of the longitudinal wave. Therefore, the frequency is always unchanged, irrespective of any changes in speed.
    $$\Rightarrow v \propto \lambda$$
    Hence, when a longitudinal wave travels into a medium in which its speed increases, its wavelength also increases.
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