8th Class Science Sound Question Bank

done Sound Summative Objective Problems Total Questions - 30

• question_answer1)
  The sound in human is produced by
  A)
   heart                                    done clear
  B)
   mouth done clear
  C)
   larynx                                   done clear
  D)
   hair done clear
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• question_answer2)
  Frequency of sound is lowest for
  A)
   man         done clear
  B)
   woman done clear
  C)
   young boy                          done clear
  D)
   young girl done clear
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• question_answer3)
  In which medium sound travel fastest
  A)
   solid    done clear
  B)
   liquid done clear
  C)
   gas                                        done clear
  D)
   vacuum done clear
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• question_answer4)
  For an oscillating pendulum of fixed length, which of the following is true?
  A)
   frequency depends on amplitude of oscillation done clear
  B)
   frequency and time period are not related. done clear
  C)
   time period depends on amplitude of oscillation done clear
  D)
   frequency and time period are related and do not depend on amplitude of oscillation. done clear
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• question_answer5)
  Which one of the following material will reflect sound better?
  A)
   Thermocole   done clear
  B)
   Curtain made from cloth done clear
  C)
   Steel         done clear
  D)
   Paper done clear
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• question_answer6)
  An object vibrated with a frequency of 15 Hz. Which of the following is true?
  A)
   It produces sound which we can hear. done clear
  B)
   It does not produce sound. done clear
  C)
   It produces sound which we cannot hear. done clear
  D)
   It produces sound which we can hear if we strain our ears. done clear
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• question_answer7)
  Unit of frequency is
  A)
   decibel (dB)       done clear
  B)
   Hertz (Hz) done clear
  C)
   meter                                  done clear
  D)
   second done clear
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• question_answer8)
  Inverse of frequency is called
  A)
   amplitude          done clear
  B)
   frequency done clear
  C)
   loudness                             done clear
  D)
   time period done clear
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• question_answer9)
  Time taken for 10 oscillation of a body is 20 second, then time period of the body is
  A)
   1 sec                                     done clear
  B)
   2 sec done clear
  C)
   3 sec                     done clear
  D)
   4 sec done clear
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• question_answer10)
  Eardrum is a part of
  A)
   sound producing organ done clear
  B)
   skeletal system done clear
  C)
   hearing organ done clear
  D)
   reproductive organ done clear
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• question_answer11)
  The hearing range of human ear is
  A)
   20 Hz to 20, 000 Hz done clear
  B)
   less than 20 Hz done clear
  C)
   more than 20,000 done clear
  D)
   20,00 Hz to 25, 000 Hz done clear
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• question_answer12)
  The voice box is also called
  A)
   stomach                              done clear
  B)
   heart done clear
  C)
   larynx                   done clear
  D)
   mouth done clear
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• question_answer13)
  Large amplitude of sound vibrations w produce
  A)
   loud sound    done clear
  B)
   weak sound done clear
  C)
   slow sound        done clear
  D)
   none of these done clear
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• question_answer14)
  The pitch of sound depends oil
  A)
   frequency   done clear
  B)
   amplitude done clear
  C)
   both of these   done clear
  D)
   none of these done clear
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• question_answer15)
  Vocal cords are the part of
  A)
   mouth                 done clear
  B)
   ear     done clear
  C)
   eyes                     done clear
  D)
   larynx done clear
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• question_answer16)
  The length of the vocal Cords is maximum for
  A)
   man     done clear
  B)
   Woman done clear
  C)
   boy                                       done clear
  D)
   girl done clear
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• question_answer17)
  Shrill sound is of
  A)
   higher frequency            done clear
  B)
   lower frequency done clear
  C)
   higher amplitude            done clear
  D)
   lower amplitude done clear
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• question_answer18)
  Flat sound is of
  A)
   higher pitch                       done clear
  B)
   lower pitch done clear
  C)
   higher amplitude    done clear
  D)
   lower amplitude done clear
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• question_answer19)
  Frequency of a body is 10 Hz, then range is
  A)
   ultrasonic          done clear
  B)
   infrasonic done clear
  C)
   audible                done clear
  D)
   decible (dB) done clear
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• question_answer20)
  Unit of loudness
  A)
   Hertz (Hz)           done clear
  B)
   meter done clear
  C)
   second                done clear
  D)
   none of these done clear
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• question_answer21)
  The speed of sound in solid, liquid and gas can be correctly compared as
  A)
   solid > liquid > gas  done clear
  B)
   liquid > gas > solid done clear
  C)
   liquid > solid > gas   done clear
  D)
   gas > liquid > gas done clear
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• question_answer22)
  A person, pressing his ear on the railway tracks can hear an approaching train. This is possible due to
  A)
   vibration of railway tracks done clear
  B)
   vibration of air done clear
  C)
   more speed of sound in solid medium done clear
  D)
   hearing ability of the man done clear
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• question_answer23)
  A person can be identified by the quality of sound produced by him. The characteristic of a sound can be determined by
  A)
   amplitude          done clear
  B)
   frequency done clear
  C)
   loudness          done clear
  D)
   all of the above done clear
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• question_answer24)
  The voices of men, women and children are different due to difference in
  A)
   larynx                   done clear
  B)
   lungs done clear
  C)
   vocal cords   done clear
  D)
   wind pipe done clear
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• question_answer25)
  An object moving at a speed greater than that of sound is said to be moving at
  A)
   ultrasonic speed              done clear
  B)
   sonic speed done clear
  C)
   infrasonic speed              done clear
  D)
   supersonic speed done clear
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• question_answer26)
  The velocity of sound in vacuum is
  A)
   \[332\text{ }m\text{ }{{s}^{-1}}\]                             done clear
  B)
   \[330\text{ }m\text{ }{{s}^{-1}}\] done clear
  C)
   \[\text{288 }m\text{ }{{s}^{-1}}\]                             done clear
  D)
   0 done clear
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• question_answer27)
  Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because
  A)
   speed of sound is greater than speed of light done clear
  B)
   speed of sound is equal to the speed of light done clear
  C)
   speed of light is much greater than the speed of sound done clear
  D)
   none of these. done clear
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• question_answer28)
  A to and fro motion by an object is also called
  A)
   periodic motion     done clear
  B)
   oscillatory motion done clear
  C)
   Cyclic motion       done clear
  D)
   none of these done clear
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• question_answer29)
  An object oscillates 50 times in one second. What should be its frequency?
  A)
   0.2 Hz                   done clear
  B)
   0.02 Hz done clear
  C)
   0.002 Hz              done clear
  D)
   50 Hz done clear
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• question_answer30)
  The time period of simple pendulum is 0.2 sec. what is its frequency of oscillation?
  A)
   0.5 Hz                                   done clear
  B)
   5 Hz done clear
  C)
   50 Hz                    done clear
  D)
   1 Hz done clear
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