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Sound Test - 57

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Sound Test - 57
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Waves used for wielding plastics
    Solution

    Ultrasonic waves are used for wielding plastics. Two plastic surfaces are pressed against each other then ultrasonic waves are allowed to fall at a point where plastic surfaces are in contact.

  • Question 2
    1 / -0
    Bats detect the obstacle in their path by receiving the detected
    Solution

    Bats can produce ultrasonic waves by flapping their wings. They can also detect these waves.these waves produced by the bats after reflection from the obstacles like building guide them to  remain away from the obstacles during night with the help of ultrasonic waves.

  • Question 3
    1 / -0
    The technique used by bats to find their way or to locate food is _______.
    Solution

    Bats search out prey and fly in dark night by emitting and detecting reflections of ultrasonic waves. The high-pitched ultrasonic squeaks of the bat are reflected from the obstacles or prey and returned to bat’s ear. The nature of reflections tells the bat where the obstacle or prey is and what it is like. This technique used by bats to find their way or to locate food is called echolocation.

    Option (C) is correct.

  • Question 4
    1 / -0
    A piano and a violin produce sound of _______ timbre.
    Solution
    Quality or Timbre of a sound is that characteristic which distinguishes the two sounds of the same pitch and loudness but emitted by two different instruments. It depends on the waveform. The waveform of a sound from an instrument depends on the presence of subsidiary vibrations along with the principal vibration and the relative amplitudes of various subsidiary vibrations in relation to principal vibration. Different instruments emit different subsidiary notes, e.g., a note played on a piano has a large number of subsidiary notes while a flute contains only a few subsidiary notes.
  • Question 5
    1 / -0
    The distance between two successive crests or two successive troughs on a transverse wave is known as
    Solution
    The wavelength is the distance between two successive crests or two successive troughs on a transverse wave. It is also equal to the distance between any two points where the particles are passing through their respective mean positions in the same direction. It is also the distance between two successive compressions or two successive rarefactions on a longitudinal wave. The SI unit of wavelength is metre (m).
  • Question 6
    1 / -0
    Due to which phenomena sound is produced by striking a tuning fork over rubber pad?
    Solution
    Due to compression and rarefaction phenomena, sound is produced when tuning fork strikes a rubber pad.
  • Question 7
    1 / -0
    What is the commonly stated human hearing frequency range?
    Solution
    The audible range of hearing for average human beings is in the frequency range of $$20\ Hz – 20\ kHz.$$
  • Question 8
    1 / -0
    A replica of longitudinal waves can be best observed 
    Solution
    Longitudinal waves are made up of compressions and rarefactions in the medium in which it travels. 
    If we press and release a horizontal spring, it exhibits a confined motion of compression and rarefaction. So, it shows a replica of longitudinal waves. A swinging pendulum performs simple harmonic motion. A struck guitar string exhibits a replica of transverse waves. A rotating top exhibits rotational motion.
  • Question 9
    1 / -0
    In which of the following speed of sound is maximum?
    Solution
    Speed of sound depends on density of materials. 
    Steel having the higher density of all the materials mentioned. so it will transmit sound at the highest speed.
  • Question 10
    1 / -0
    Which of the following statements supports the fact that sound requires a material medium to pass through?
    Solution
    • We do not hear sound of explosions from Sun as there is no medium in between the earth and the sun. 
    • Due to the same reason, a bell ringing inside a vacuumed jar can not be heard. 
    • If we put one ear on an iron rod and hit on the rod, we hear two sounds. One sound of the hit comes through air and another through iron rod. Sound travels faster through solid. So, sound through iron rod will be heard first followed by the sound through air.
    All the three options are correct. Option D is the answer.
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