8th Class Science Sound Question Bank

done Sound Total Questions - 20

• question_answer1)

  Fill in the blanks with the most appropriate option.

  If a guitar string is pulled strongly, its amplitude of vibration ___(i)___ and the note heard is ___(ii)___. If it is pulled lightly, its amplitude of vibration ___(iii)___ and the note heard is ___(iv)___.

   
  A)

  (i)	(ii)	(iii)	(iv)
  Increases	Louder	Increases	Louder

  done clear
  B)

  (i)	(ii)	(iii)	(iv)
  Decreases	Softer	Decreases	Softer

  done clear
  C)

  (i)	(ii)	(iii)	(iv)
  Increases	Louder	Decreases	Softer

    done clear
  D)

  (i)	(ii)	(iii)	(iv)
  Decreases	Softer	Increases	Louder

  done clear
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• question_answer2)

  Direction: Read the given paragraph and answer the following questions.

  Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that a 30 cm ruler extends about 15 cm over the edge and a 60 cm ruler extends about 30 cm over the edge. Both the ends are flicked.

  Which of the following statements is correct regarding this?

  (i)  The metal ruler of length 30 cm is able to vibrate slower.

  (ii) The metal ruler of length 30 cm produces a high pitch sound.

  (iii) The metal ruler of length 60 cm is able to vibrate faster.

  (iv) The metal ruler of length 60 cm produces a low pitch sound.

   
  A)
  Only (i) and (iii) are correct. done clear
  B)
  Only (ii) and (iv) are correct. done clear
  C)
  Only (i) and (iv) are correct. done clear
  D)
  Only (ii) and (iii) are correct. done clear
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• question_answer3)

  Direction: Read the given paragraph and answer the following questions.

  Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that a 30 cm ruler extends about 15 cm over the edge and a 60 cm ruler extends about 30 cm over the edge. Both the ends are flicked.

  Read the given statements and select the correct option.

  Statement 1: The note heard in the vibration of 30 cm ruler is louder when flicked with larger amplitude.

  Statement 2: Loudness of a sound depends on the amplitude of vibrations.

   
  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true but statement 2 is false. done clear
  D)
  Statement 1 is false but statement 2 is true. done clear
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• question_answer4)
  In which of the following media can sound travel through?

  (i) Glass of water

  (ii) Balloon full of air

  (iii) Iron bar

  (iv) Vacuum

   
  A)
  (i) and (ii)                   done clear
  B)
  (i) and (iii)                  done clear
  C)
  (i), (ii) and (iii) done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer5)
  There are two bottles of glass, one bottle is two third filled with water and another bottle is filled one third with water. When we blow across the mouth of each bottle, then

  (i)   The bottle with the less air in it gives the note of higher pitch

  (ii) The shorter the air column, the higher the pitch of the note produced.

  A)
   Both (i) and (ii) are correct and (ii) is the correct explanation of (i). done clear
  B)
   Both (i) and (ii) are correct but (ii) is not the correct explanation of (i). done clear
  C)
   Only (i) is correct. done clear
  D)
   Only (ii) is correct. done clear
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• question_answer6)
  Consider the following statements and select the correct option which correctly identifies true (T) and false (F).

  (i)  Short string produces notes of low pitch.

  (ii) Thin string produces notes of high pitch

  (iii) Tightly stretched string produces notes of low pitch.

   
  A)

  (i)	(ii)	(iii)
  T	F	T

    done clear
  B)

  (i)	(ii)	(iii)
  T	T	F

    done clear
  C)

  (i)	(ii)	(iii)
  T	T	F

    done clear
  D)

  (i)	(ii)	(iii)
  F	T	F

    done clear
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• question_answer7)
  Read the given statements and select the correct option.

  Statement 1: When Ravi saw a film on space wars, he didn't hear any explosions.

  Statement 2: Sound travels slowest through gases.

  A)
   Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
   Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
   Statement 1 is true but statement 2 is false. done clear
  D)
   Statement 1 is false but statement 2 is true. done clear
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• question_answer8)
  Observe the given Venn diagram and select the correct option.
  A)

  I	II	III
  Human	Bat	Rhinoceros

  done clear
  B)

  I	II	III
  Rhinoceros	Human	Bat

  done clear
  C)

  I	II	III
  Bat	Rhinoceros	Human

  done clear
  D)

  I	II	III
  Elephant	Bat	Human

  done clear
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• question_answer9)
  Which of the following shows a pleasant sound?
  A)
                  done clear
  B)
              done clear
  C)
                 done clear
  D)
    done clear
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• question_answer10)
  The sound wave with high frequency can be given by
  A)
     done clear
  B)
     done clear
  C)
      done clear
  D)
             done clear
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• question_answer11)
  If the temperature increases, then what happens to the frequency of the sound produced by the organ pipe?
  A)
   Increases                     done clear
  B)
   Decreases       done clear
  C)
   Unchanged                 done clear
  D)
   Can't say        done clear
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• question_answer12)
  In an experiment to measure the speed of sound in air, a boy stands 40 m away from a wall and bangs two pieces of wood together. At the instant he hears the echo, he bangs them together again. He does this activity 50 times. The time taken for 50 bangs is 12 s. Which calculation gives the speed of sound in air?
  A)
   \[\frac{12}{40\times 50}\]                 done clear
  B)
   \[\frac{40\times 50}{12}\]     done clear
  C)
   \[\frac{40\times 2\times 50}{12}\]                 done clear
  D)
   \[\frac{40\times 2\times 12}{50}\]     done clear
  View Solution play_arrow

• question_answer13)

  A student performed an experiment as shown in the figure.

  What would be happened as air was pumped out of the jar and the electric bell rang?

     
  A)
  The sound became louder. done clear
  B)
  The sound became fainter first and then louder once all the air was pumped out. done clear
  C)
  The sound could not be heard anymore. done clear
  D)
  The sound was the same as before. done clear
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• question_answer14)
  A tuning fork sends sound waves in air. If the temperature of air increases, which of the following parameters will change?
  A)
   Time period    done clear
  B)
   Frequency       done clear
  C)
   Wavelength                 done clear
  D)
   All of these done clear
  View Solution play_arrow

• question_answer15)
  Read the given statements and select the correct option.

  Statement 1: Sound would travel faster on a hot summer day than on a cold winter day.

  Statement 2: Velocity of sound depends on temperature.

  A)
   Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
   Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
   Statement 1 is true and statement 2 is false. done clear
  D)
   Both statements 1 and 2 are false. done clear
  View Solution play_arrow

• question_answer16)
  Sound waves were sent down from a ship and they returned after 2 seconds. What is the depth of the sea, if the speed of sound in water is\[\text{1}\text{.5 km }{{\text{s}}^{\text{-1}}}\]?
  A)
   150 m             done clear
  B)
   3 km   done clear
  C)
   1.5 km            done clear
  D)
   750 m done clear
  View Solution play_arrow

• question_answer17)
  A man fires a gun 150 m from a cliff. A second man who is standing 300 m further away from the cliff hears the gun 1 second after he sees the flash. The second man will hear the echo from the cliff
  A)
   1 second after seeing the flash done clear
  B)
   2 seconds after hearing the gun done clear
  C)
   2 seconds after seeing the flash done clear
  D)
   4 seconds after hearing the gun. done clear
  View Solution play_arrow

• question_answer18)
  A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is 346 m/s. The distance between the dog and the building is
  A)
   86.5 m done clear
  B)
   80.6 m            done clear
  C)
   75 m               done clear
  D)
   8.65 m done clear
  View Solution play_arrow

• question_answer19)
  The picture shows a xylophone. A, B, C and D are the rods in it. Which of the following rods has high pitch of the sound and which has low frequency of vibrations?
  A)

  High pitch	Low frequency
  D	A

  done clear
  B)

  High pitch	Low frequency
  B and C	B and C

  done clear
  C)

  High pitch	Low frequency
  A and D	A and D

  done clear
  D)

  High pitch	Low frequency
  A	D

  done clear
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• question_answer20)
  A student sets up a slinky PQ on a smooth table top in the manner as shown in figure. How can he produce transverse waves in the slinky by moving its free end Q?
  A)
   At an angle of \[45{}^\circ \] with the table top done clear
  B)
   Backward and forward along the length of the slinky done clear
  C)
   Up and down done clear
  D)
   Left and right done clear
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