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Sound Test - 39

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Sound Test - 39
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Sound waves produce echo due to
    Solution
    Phenomenon of hearing back our own sound is called an echo. It is due to successive reflection of sound waves from the surfaces or obstacles of large size. To hear an echo, there must be a time gap of 0.1 second in original sound and the reflected sound.
  • Question 2
    1 / -0
    When we say 'sound travels in a medium' we mean :
    Solution
    Sound is a mechanical wave , it is defined as a disturbance which travels through a material medium due to repeated periodic vibrations of the particles of the medium about their mean position , the disturbance is transferred from one particle to the adjoining particle , without any net movement of medium .
  • Question 3
    1 / -0
    In which of three media; air, water and steel, does sound travel the fastest?
    Solution
    As we know, speed of sound in solids is maximum and in gases is minimum. As steel is  solid therefore sound travels faster through steel than through air and water .
                    
  • Question 4
    1 / -0
    The nerve that carries the signals from the ear to the brains is called:
    Solution
    Optic nerve carries the signal from eye to brain .
    Motor nerve controls the muscle .
    Spinal cord transmits the signals between brain and rest of the body .
    Auditory nerve is that , which carries the signals from ear to the brain .

    Hence, option A is correct.
  • Question 5
    1 / -0
    The frequency of a given sound is $$1.5 kHz$$. How many vibrations does it complete in one second?
    Solution
    The frequency of a vibration is defined as number of vibrations happening in one second.Since frequency is given as $$1.5kHz=1500Hz=1500Vibrations/sec$$
    So the number of vibrations in one second is $$1500$$
  • Question 6
    1 / -0
    A person, pressing his ear on the railway tracks can hear an approaching train. This is possible due to:
    Solution
    As the railway track is solid, the sound travels faster through the track than through air and a person can hear an approaching train .
  • Question 7
    1 / -0
    A man standing in front of a vertical cliff fires a gun. He hears the echo after $$3$$ seconds. On moving closer to the cliff by $$82.5 m$$, he fires again. This time, he hears the echo after $$2.5$$ seconds. Calculate the velocity of sound.
    Solution
    Let speed of sound be $$v$$.
    Let distance of cliff from man be $$d$$.
    time taken initially $$t_1=3s$$
    time taken after man gets closer to cliff $$t_2=2.5s$$
    $$Speed=\dfrac{Distance}{Time}$$
    $$time=\dfrac{Distance}{speed}$$
    So case 1
    $$3=\dfrac{2d}{v}$$.............(1)
    (Distance travelled by sound is 2d as it goes to cliff and comes back)
    So case 2
    $$2.5=\dfrac{2(d-82.5)}{v}$$...........(2)
    Dividing 1 by 2
    $$\dfrac{3}{2.5}=\dfrac{d}{(d-82.5)}$$
    $$3d-247.5=2.5d$$
    $$0.5d=247.5$$
    $$d=495m$$
    From 1
    $$v=\dfrac{2d}{3}=\dfrac{2\times 495}{3}=330m/s$$

  • Question 8
    1 / -0
    When a tuning fork was struck and brought near a bucket of water, a wave as shown in figure was formed on its surface. If the fork is struck much harder and brought near the surface, what will increase?

    Solution
    The fork will vibrate with a greater amplitude when hit hard. 
    Transfer of this high energy will create higher amplitude on the surface of water.
  • Question 9
    1 / -0
    What happens when sound strikes a surface?
    Solution
    Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. The law of reflection of sound states that the directions in which the sound is incident and reflected make equal angles with the normal to the reflecting surface at the point of incidence and the three lie in the same plane.
  • Question 10
    1 / -0
    Quality of sound is used to distinguish between:
    Solution
    Quality of sound is that characteristic, which enables us to distinguish between sound produced by two different sources. It is the property of the source.
    Noise and music are scientifically different but they also depend on the personal interest of a man, so can't be distinguished by quality.
    Two notes produced by the same body, can't be distinguished by quality because the source is the same.
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