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Sound Test - 6

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Sound Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0

     When we say that sound travels in a medium, what do we mean?

    Solution

    In a wave (like sound wave), the particles of the medium, the source nor the medium do not travel. It is the disturbance (energy) which travels along the path.

  • Question 2
    1 / -0

      Which of the following correctly represents the speed of sound in solids, liquids and gases in ascending order?

    Solution

    The speed of sound in ascending order is minimum in gases, lesser in liquids and maximum in solids. Gas (air) - 330 - 340 m/s Liquid (water) - 1500 m/s Solid (steel) - 5000 m/s.

  • Question 3
    1 / -0

    A person can hear an approaching train when he presses his ear to the railway track faster than one who simply stands on the tracks. What makes this possible?

    Solution

    The velocity of sound in solids (railway tracks) is faster than that in air.

  • Question 4
    1 / -0

     A person can be identified by his voice. What determines this distinguishing feature?

    (i) Amplitude

    (ii) Pitch

    (iii) Loudness

    Solution

     A person is identified by the sound which is characterized by its amplitude.

  • Question 5
    1 / -0

     In human beings, which of the following produces the sound?

    Solution

    Sound is produced by larynx or voice box.

  • Question 6
    1 / -0

     An object oscillates 50 times in one second. What is its frequency?

    Solution

    The number of oscillations per second is called the frequency of oscillation, i.e. 50 Hz.

  • Question 7
    1 / -0

    In which of the three media does sound travel the fastest?

    Solution

    Sound travels the fastest in solids, less in liquids and the least in gases.

  • Question 8
    1 / -0

    Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why?

    Solution

    Thunder is heard later because the speed of light (flash) is much greater (3×108ms−1)than the speed of sound (330ms−1).

  • Question 9
    1 / -0

     What is the cause for the difference in the voices of men, women and children?

    Solution

    Two vocal cords are stretched across the larynx in such a way that it leaves a narrow slit between them for the passage of air. The length of vocal cords and the width of the slit is different in men, women, children, thus producing different sounds.

  • Question 10
    1 / -0

    Which of the following represents Hertz?

    Solution

    Frequency = 1/time period. =1/unitof time = second−1

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