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Sound Test - 56

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Sound Test - 56
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is true?
    Solution
    If the particles of a medium vibrate or oscillate to and fro about their equilibrium position along the direction of propagation of disturbance then the wave is called longitudinal wave.
  • Question 2
    1 / -0
    Identify the device which work on the reflection of sound.
    Solution
    Megaphone, Stethoscope and Sound boards work on the reflection of sound.
    $$1.$$Megaphone is a portable, cone shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction.
    $$2.$$Stethoscope is an acoustic medical device for listening to the internal sounds of an animal or human body.
    $$3.$$Sound board is the surface of a string instrument that the string vibrate against.
  • Question 3
    1 / -0

    Speed of sound is maximum in :

    Solution

  • Question 4
    1 / -0

    How does sound from a sound producing body travel through air to reach our ears?

    Solution
    Sound from a sound producing body travel through air to reach our ears by making regular compression and rarefaction.
  • Question 5
    1 / -0

    Rats also play games by producing ______.

    Solution
    Frequencies above $$20 \ kHz$$ are called ultrasonic or ultrasound. 

    Ultrasound is produced by dolphins, bats and porpoises. Moths of certain families have very sensitive hearing equipment. These moths can hear the high frequency squeaks of the bat and know when a bat is flying nearby, and are able to escape capture. Rats also play games by producing ultrasound.
  • Question 6
    1 / -0
    The ultrasonic wave produced in SONAR is of frequency
    Solution

    In SONAR, the transmitter transmits ultrasonic waves of very high frequency(50000Hz).

  • Question 7
    1 / -0
    Which part of the ear vibrates when sound waves enter our ear?
    Solution
    The ear canal provides the path to sound to the ear. Pinna collects the sound.
    Cochlea transforms the sound into a neural message.
    The eardrum vibrates when a sound wave strikes them.
  • Question 8
    1 / -0
    The thin stretched membrane at the end of the ear canal is 
    Solution
    Eardrum is the thin stretched membrane at the end of inner ear , which vibrates when sound wave strikes it .
  • Question 9
    1 / -0

    Three different vibrating bodies produce three types of sounds X, Y and Z. Sounds X and Y cannot be heared by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in for monitoring nuclear reactor.Y is sound similar to that which is produced during an earthquake before the main shock wave is generated. What type of sounds are (i) X (ii) Y, and (iii) Z?

    Solution

    Infrasound is the sound where the rate of vibration is too low for us to hear

    Ultrasound is the sound  where the rate of vibration is too high for us to hear


    Ultrasound is used to see what is happening in a nuclear reactor.Ultrasounds and infra sounds are not audible to man.Ultrasound have frequency more than 20kHz. Infrasound have frequency below 20Hz.An earthquake produces infrasound before the mainshock wave begins.

    Since Z can be heard by a person so Z is in audible range and it is audible sound.

  • Question 10
    1 / -0

    Which of the following is not an application of ultrasound

    Solution

    Ultrasound has no use in metal refining. But it is used to kill bacteria in liquids. Thus the liquid can be preserved for a long time. Ultrasound is thrown on metal under investigation for any sort of cracks or faults.

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