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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
    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 2
    1 / -0
    The voices of men, women and children are different due to difference in:
    Solution
    The larynx is responsible for the production of sound, and vocal cords are placed inside the larynx, which is responsible for shrill and grave sound, that makes the sound of a lady shrill and of a man, grave.
    Lungs filter the oxygen from the air.
    The windpipe is the path of air towards the lungs.
  • Question 3
    1 / -0
    The buzzing sound produced by a mosquito is produced by:
    Solution
    Answer:Answer:- C
    The noise from a mosquito comes from its wing beat. since the sound is of low intensity, we would hear it only if its close to our ears. it is the high pitch of the sound that probably makes it so irritating.
  • Question 4
    1 / -0
    Vibration of air column produces sound in which of the following instruments?
    Solution
      In flute and Siren , air is blown inside these instruments (energy is given) , and air inside them vibrates i.e. air column vibrates and sweet sound is produced .
       A Jaltaranga acts like a closed organ pipe , in which  energy is given to air column by a stick stroke .
  • Question 5
    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 6
    1 / -0
    In Dholak sound produce due to which of the following?
    Solution
    When the sticks hit on the surface of the membrane, the membrane vibrates and results in the production of sounds.
    So answer is A
  • Question 7
    1 / -0
    The frequency of a given sound is 1.5kHz1.5 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/sec1.5kHz=1500Hz=1500Vibrations/sec
    So the number of vibrations in one second is 15001500
  • Question 8
    1 / -0
    The membrane of a drum vibrates to produce sound. Similarly, the string of a sitar vibrates to produce sound. Based on these two examples answer the following question. Which part of a whistle vibrates to produce sound?
    Solution
    In flute or whistle, the air column inside vibrates and produces sound.
  • Question 9
    1 / -0
    The figure given shows the images of sound waves. Look at them and answer the following question. 
    Which sound is noise?

    Solution
    A musical sound is periodic and regular, but noise is irregular and non-periodic. Both are mixtures of sounds of different frequencies but frequencies in musical sound are discrete but noise frequencies are discontinuous and irregular.
    In a musical sound,  wave patterns are repeating whereas a noise has irregular wave patterns. As out of the given figure, we have irregular patterns in figure (d)(d), so it is a noise. 
  • Question 10
    1 / -0
    Choose the correct answer.
    Sound can travel through

    Solution
    Answer is D.

    Sound is a form of energy produced and transmitted by vibrating matter. Sound travels in waves. When sound moves through matter (solid, liquid, or a gas), the molecules of the matter move backward and forward in the direction in which the wave is traveling. This movement is called a vibration. Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together. Sound travels the lowest through gases because the molecules of a gas are farthest apart. In a vacuum sound cannot travel because there is no matter for it to move through.
    Hence, sounds can travel in solids, liquids and gases.
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