8th Class Science Sound Question Bank

done Sound Formative Objective Problems Total Questions - 11

• question_answer1)
  The speed of sound in air at \[0{}^\circ C\] is approximately
  A)
   \[330m/s\]                         done clear
  B)
   \[1450m/s\] done clear
  C)
   \[5100\text{ }m/s\]          done clear
  D)
   \[3\times {{10}^{8}}\text{ }m/s\] done clear
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• question_answer2)
  If \[{{V}_{g}},{{V}_{l}},{{V}_{s}}\] represent the speed of sound in a gas, liquid and solid respectively then
  A)
   \[{{V}_{g}}>{{V}_{l}}>{{V}_{s}}\]              done clear
  B)
   \[{{V}_{s}}>{{V}_{l}}>{{V}_{g}}\] done clear
  C)
   \[{{V}_{l}}>{{V}_{s}}>{{V}_{g}}\]              done clear
  D)
   \[{{V}_{g}}>{{V}_{s}}>{{V}_{l}}\] done clear
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• question_answer3)
  The speed of light in air is _____
  A)
   \[330\text{ }m/s\]                          done clear
  B)
   \[5100\text{ }m/s\] done clear
  C)
   \[3\times {{10}^{8}}m/s\]        done clear
  D)
   \[3\times {{10}^{10}}m/s\] done clear
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• question_answer4)
  Speed of sound in air is independent of charge in
  A)
   Temperature                    done clear
  B)
   Pressure done clear
  C)
   Humidity             done clear
  D)
   Wind done clear
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• question_answer5)
  Speed of sound depends on
  A)
   Pressure             done clear
  B)
   Direction done clear
  C)
   Frequency         done clear
  D)
   Amplitude done clear
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• question_answer6)
  The speed of sound is 330 m/s and that of light is \[^{3X}{{10}^{8}}m/s\] .  The ratio of speed of sound to light is approximately
  A)
   \[1={{10}^{5}}\]                               done clear
  B)
   \[1={{10}^{6}}\] done clear
  C)
   \[1={{10}^{6}}\]               done clear
  D)
   \[1={{10}^{7}}\] done clear
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• question_answer7)
  A man standing near a cliff with a seconds pendulum fires a gun when the pendulum is at the mean position and hears the echo when it just reaches the extreme position. If the speed of sound is \[340m{{s}^{-1}}\], calculate his distance from the cliff.-
  A)
   80 m                                     done clear
  B)
   85 m done clear
  C)
   75 m                                     done clear
  D)
   70 m done clear
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• question_answer8)
  A man stands at a distance of 255m from a cliff. He fires a gun and heard the echo after 1.5 seconds. What will be the velocity of the sound?
  A)
   330 m/s               done clear
  B)
   340 m/s            done clear
  C)
   320 m/s               done clear
  D)
   335 m/s done clear
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• question_answer9)
  A boy stands 85 m in front of a high wall and then blows a whistle. Calculate the time interval when he hears an echo. (speed of sound = 340 m/s)
  A)
   0.5 s               done clear
  B)
   5 s done clear
  C)
   1.5 s                                      done clear
  D)
   2 s done clear
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• question_answer10)
  An echo returned in 3s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m/s?
  A)
   520 m                   done clear
  B)
   515 m done clear
  C)
   530 m                   done clear
  D)
   513 m done clear
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• question_answer11)
  A man stands in between two cliffs and fires a gun. He hears two successive echoes after 3 seconds and 5 seconds. What is the distance between two cliffs? [speed of sound\[=\text{ }330m{{s}^{-1}}\]]
  A)
   1320 m           done clear
  B)
   132 m done clear
  C)
   1333 m                 done clear
  D)
   1230 m done clear
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