8th Class Science Force and Pressure Question Bank

done Force, Friction and Sound Total Questions - 40

• question_answer1)
  Force X and Y are applied on an object in opposite directions. If the magnitude of force Y is more than the X, then the net force acting on the object                   .
  A)
  X - Y is in the direction of Y. done clear
  B)
  Y - X is in the direction of Y. done clear
  C)
  X - Y is in the direction of X. done clear
  D)
  Y - X is in the direction of X. done clear
  E)
  None of these done clear
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• question_answer2)
  We can conclude that force can change the shape of an object by which of the following examples?
  A)
  Breaking of glass on hammering. done clear
  B)
  Squeezing of a toothpaste tube. done clear
  C)
  Stretching of a spring on applying force. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer3)
  Which one of the following forces can be applied only when the body is in contact with the object?
  A)
  Frictional force    done clear
  B)
  Muscular force done clear
  C)
  Gravitational force done clear
  D)
         Both [a] and [b] done clear
  E)
  None of these done clear
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• question_answer4)
  S.I. unit of pressure is?
  A)
  Newton              done clear
  B)
  Pascal done clear
  C)
  Metre                done clear
  D)
  Newton done clear
  E)
  None of these done clear
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• question_answer5)
  When would depression in the ground be the most:
  A)
  When a man stands on the ground done clear
  B)
  When a lies upside down on the ground. done clear
  C)
  When a tree falls on the ground. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer6)
  _____ is involved in filling up the liquid into the syringe.
  A)
  Atmospheric pressure done clear
  B)
  Magnetic pressure done clear
  C)
  Frictional force done clear
  D)
         Electrostatic force done clear
  E)
  None of these done clear
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• question_answer7)
  The force which always opposes the motion of an object is:
  A)
  Gravitational force          done clear
  B)
  Frictional force done clear
  C)
  Magnetic force    done clear
  D)
  Muscular force done clear
  E)
  None of these done clear
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• question_answer8)
  Friction arises due to _______ in the surfaces of objects.
  A)
  Softness             done clear
  B)
  Irregularities done clear
  C)
  Atmospheric pressure done clear
  D)
  Magnetism done clear
  E)
  None of these done clear
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• question_answer9)
  The net force is zero when the two forces applied on an object are in:
  A)
  The same directions done clear
  B)
  The opposite directions and are of different in magnitude. done clear
  C)
  The same directions and are same in magnitude. done clear
  D)
  The opposite directions and are of equal in magnitude. done clear
  E)
  None of these done clear
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• question_answer10)
  Atmospheric pressure _______ with increasing height.
  A)
  Increases                        done clear
  B)
  Decreases done clear
  C)
  Remains same    done clear
  D)
  Expands done clear
  E)
  None of these done clear
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• question_answer11)
  In which of the following more frictional force will be observed?
  A)
  A man walking on a glass. done clear
  B)
  A man walking on ice. done clear
  C)
  A man walking on a concrete road. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer12)
  When the force applied in the directions of motion of the object, its spa
  A)
  Decreases done clear
  B)
  Increases done clear
  C)
  Either increases or decreases      done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer13)
  School bags have wide straps so as to:

  (i) Increase the pressure on the shoulder.

  (ii) Decrease the pressure on the shoulder.

  (iii) Make the bag's weight fall over a small area of the shoulder.

  (iv) Make the bag's weight fall over a large area of the shoulder.

  A)
  (ii) and (iii)                      done clear
  B)
  (i) and (iii) done clear
  C)
  (i) and (ii)             done clear
  D)
            (ii) and (iv) done clear
  E)
  None of these done clear
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• question_answer14)
  Friction depends on the:
  A)
  Nature of two surfaces. done clear
  B)
  Forces with which two surfaces are pressed together. done clear
  C)
  Both [a] and [b] done clear
  D)
  Either [a] or [b] done clear
  E)
  None of these done clear
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• question_answer15)
  Usually length of vocal cords of men is ____ women.
  A)
  Less than                       done clear
  B)
  Greater than done clear
  C)
  Same as                        done clear
  D)
  Slightly less than done clear
  E)
  None of these done clear
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• question_answer16)
  Pressure at the surface of the pond is _____ the pressure at the bottom of the pond.
  A)
  Same as                        done clear
  B)
  Less than done clear
  C)
  Greater than                   done clear
  D)
  Slightly greater than done clear
  E)
  None of these done clear
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• question_answer17)
  A force is applied on an object which is in rest. If frictional force is equal to applied force then the body:
  A)
  Will move in forward direction. done clear
  B)
  Will move in backward direction. done clear
  C)
  Will remain in rest.               done clear
  D)
  Will move in upward direction. done clear
  E)
  None of these done clear
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• question_answer18)
  ___ shaped objects will face minimum resistance while moving in under:
  A)
  Rectangular                    done clear
  B)
  Square done clear
  C)
  Oblongata                      done clear
  D)
  Streamlined done clear
  E)
  None of these done clear
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• question_answer19)
  Which of the following produces sound in Dholak?
  A)
  Stretched strings  done clear
  B)
  Air column done clear
  C)
  Stretched membrane       done clear
  D)
  Keys done clear
  E)
  None of these done clear
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• question_answer20)
  A boy is pushing a table from left to right. The force of friction will act on the table:
  A)
  From left to right done clear
  B)
  Vertically downwards done clear
  C)
  Vertically upwards done clear
  D)
  From right to left done clear
  E)
  None of these done clear
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• question_answer21)
  If the same force is applied on a toy car, on which of the following. It will move with maximum speed?
  A)
  Wooden surface done clear
  B)
  Uneven surface done clear
  C)
  Polished marble surface done clear
  D)
  Brick wall done clear
  E)
  None of these done clear
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• question_answer22)
  Two boxes filled with books, one is of 2kg and other is of 4kg are kept on a cemented floor. Which one of them would require a larger force to move it from the rest position?
  A)
  Box with heavier weight requires more force. done clear
  B)
  Box with lighter weight requires more force. done clear
  C)
  Both the boxes require same force. done clear
  D)
  Either [a] or [b] done clear
  E)
  None of these             done clear
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• question_answer23)
  The maximum friction will be observed between two objects when:
  A)
  One object which just tends to move over the surface of the other object. done clear
  B)
  One object moves slowly over the surface of another object. done clear
  C)
  One object rolls over the surface of another object. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer24)
  P and Q are two forces applied on object 0 in the same direction, then the resultant force acting on the object is equal to:
  A)
  \[P-Q\]               done clear
  B)
  Zero done clear
  C)
  \[P+Q\] done clear
  D)
  \[P\times Q\] done clear
  E)
  None of these done clear
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• question_answer25)
  A list of mediums is given below:

  (i) Wood

  (ii) Water

  (iii) Air

  (iv) Vacuum

  In which of these mediums can sound travel?
  A)
  (i) and (ii) only    done clear
  B)
  (i), (ii) and (iii) only done clear
  C)
  (iii) and (iv) only done clear
  D)
  (ii), (iii) and (iv) only done clear
  E)
  None of these done clear
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• question_answer26)
  100 Pascal is equal to:
  A)
  \[100\text{ }Newton\]                  done clear
  B)
  \[1000\,N/{{m}^{2}}\] done clear
  C)
  \[100\,\,N/{{m}^{2}}\] done clear
  D)
  \[10,000\,\,N/{{m}^{2}}\] done clear
  E)
  None of these done clear
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• question_answer27)
  As we go up in the atmosphere from the surface of earth, the atmosphere pressure decreases due to decrease in ______ of air above us.
  A)
  Length               done clear
  B)
  Weight done clear
  C)
  Colour               done clear
  D)
  Mixture  done clear
  E)
  None of these done clear
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• question_answer28)
  While playing tugs of war we often feel that the rope is slipping through our hands. We rub soil on our hands to:
  A)
  Decrease friction done clear
  B)
  Increase friction done clear
  C)
  Increase pressure done clear
  D)
  To increase area of contact done clear
  E)
  None of these done clear
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• question_answer29)
  Friction can be reduced by:
  A)
  Polishing the surface. done clear
  B)
  Greasing the surfaces. done clear
  C)
  Using wheels. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer30)
  Ball bearing is used between the hub of wheel and axle to ___ the friction.
  A)
  Increase             done clear
  B)
  f Reduce done clear
  C)
  Rub                   done clear
  D)
  Maximize done clear
  E)
  None of these done clear
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• question_answer31)
  When a pencil is thrown upwards, then its speed goes on decreasing, because of:
  A)
  Electrostatic force done clear
  B)
         Frictional force done clear
  C)
  Muscular force done clear
  D)
         Gravitational force done clear
  E)
  None of these done clear
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• question_answer32)
  Drag force is applied by which of the following and in which direction?
  A)
  Solids, in the direction or opposite to the direction of motion. done clear
  B)
  Liquids, in the direction of motion of the object only. done clear
  C)
  Gases, in the direction of motion of the object only. done clear
  D)
  Fluids, in the direction opposite to the direction of motion of the object. done clear
  E)
  None of these done clear
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• question_answer33)
  If the amplitude of a vibration is doubled then the loudness of the sounds will become:
  A)
  Half                              done clear
  B)
  One-fourth done clear
  C)
  Doubled             done clear
  D)
  Four times done clear
  E)
  None of these done clear
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• question_answer34)
  Frequency of vibration is directly proportional to___ of sound.
  A)
  Amplitude                      done clear
  B)
  Loudness done clear
  C)
  Pitch                 done clear
  D)
  Time period done clear
  E)
  None of these done clear
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• question_answer35)
  Which one of the following is a high frequency wave?
  A)
      done clear
  B)
  done clear
  C)
                       done clear
  D)
  done clear
  E)
  None of these       done clear
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• question_answer36)
    If we strike a wooden table with a steel spoon lightly we hear a feeble sound but if we hit the wooden table hard with steel spoon, a loud sound is heard because:
  A)
  Amplitude of vibration is high in case of loud sound. done clear
  B)
  Amplitude of vibration is low in case of feeble sound. done clear
  C)
  Both [a] and [b] done clear
  D)
  Either [a] or [b] done clear
  E)
  None of these done clear
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• question_answer37)
  Which one of the following statements is correct?

  (i) Loudness of sound is directly proportional to the square of amplitude vibrations.

  (ii) Sound can travel through vacuum.

  (iii) Speed of sound is maximum in solids.

  (iv) The outer part of ear is called ear canal.

  A)
  (i) and (ii)                       done clear
  B)
  (ii) and (iii) done clear
  C)
  (i) and (iii)          done clear
  D)
  (i) and (iv) done clear
  E)
  None of these done clear
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• question_answer38)
  Which one of the following is not a bone of ear?
  A)
  Anvil                 done clear
  B)
  Hammer done clear
  C)
  Humerus                        done clear
  D)
  Stirrup done clear
  E)
  None of these done clear
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• question_answer39)
  Unit of measuring loudness is:
  A)
  Hertz                 done clear
  B)
  Metre/Second done clear
  C)
  Metre                done clear
  D)
  Decibel done clear
  E)
  None of these done clear
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• question_answer40)
  In order to increase the loudness of a sound we have to:
  A)
  Decrease its frequency of vibration. done clear
  B)
  Increase its frequency of vibration. done clear
  C)
  Increase its amplitude of vibration. done clear
  D)
  Decrease its amplitude of vibration. done clear
  E)
  None of these done clear
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