8th Class Science Friction Question Bank

done Friction Total Questions - 40

• question_answer1)
  What type of a force is friction?          
  A)
   Contact force done clear
  B)
                          Non-contact force done clear
  C)
                          Electrostatic force done clear
  D)
                          Magnetic force done clear
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• question_answer2)
  What is the value of sliding friction for an object which requires 7 N of force to move it from rest?
  A)
   7 N done clear
  B)
                          Greater than 7 N done clear
  C)
                          Less than 7 N done clear
  D)
                          14 N done clear
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• question_answer3)
  Which of the following materials is likely to have the least friction?
  A)
   Wood                                   done clear
  B)
                          Cardboard          done clear
  C)
                          Glass                                    done clear
  D)
                          Paper   done clear
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• question_answer4)
  Which of the following reduces friction in a rotating machine?
  A)
   Wheels                                done clear
  B)
                          Rollers                 done clear
  C)
                          Ball bearings      done clear
  D)
                          Handle done clear
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• question_answer5)
  In which of the following cases is friction   desirable?
  A)
   Movement of piston in a cylinder done clear
  B)
                          A vehicle speeding done clear
  C)
                          Running on a track done clear
  D)
                          All of the above done clear
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• question_answer6)
  Why is a carrom board usually powdered before playing?
  A)
   For increasing friction done clear
  B)
                          For decreasing friction done clear
  C)
                          For decoration done clear
  D)
                          For fragrance done clear
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• question_answer7)
  Which of the following statements is correct?
  A)
   Rolling is easier than sliding. done clear
  B)
                          Sliding is easier than rolling. done clear
  C)
                          Dragging is easier than sliding. done clear
  D)
                          Dragging is easier than rolling. done clear
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• question_answer8)
  What is the frictional force exerted by fluids called?
  A)
   Lift                                         done clear
  B)
                          Drag                                      done clear
  C)
                          Rolling friction done clear
  D)
                          Dynamic friction done clear
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• question_answer9)
  Why are certain bodies streamlined?
  A)
   To increase friction done clear
  B)
                          To decrease weight done clear
  C)
                          To reduce friction done clear
  D)
                          To increase weight done clear
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• question_answer10)
  In the decreasing order of magnitude, which of the following is correct?
  A)
   Rolling < static < sliding friction done clear
  B)
                          Static > sliding > rolling friction done clear
  C)
                          Static > rolling > sliding friction done clear
  D)
                          Sliding < static < rolling friction done clear
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• question_answer11)
  Which of the following activities is easier to perform on a drum of 10 kg?
  A)
   Dragging the drum done clear
  B)
                          Lifting the drum done clear
  C)
                          Rolling the drum done clear
  D)
                          All of the above need the same effort done clear
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• question_answer12)
  Why does a meteor burn upon entering the earth's atmosphere?
  A)
   Due to gravitational pull done clear
  B)
                          Due to the heat of the earth done clear
  C)
                          Due to solar radiation done clear
  D)
                          Due to excess friction in air done clear
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• question_answer13)
  Why are the head of a match stick and the sides of a match box deliberately made rough?
  A)
   To increase friction done clear
  B)
                          To decrease friction done clear
  C)
                          To increase the amount of heat done clear
  D)
                          To decrease the amount of heat done clear
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• question_answer14)
  Why are spikes provided in the shoes of athletes?
  A)
   As a decoration done clear
  B)
                          To increase friction done clear
  C)
                          To decrease friction done clear
  D)
                          To give shape done clear
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• question_answer15)
  Which force prevents us from slipping while walking on the road?
  A)
   Muscular force of our body done clear
  B)
                          Gravitational pull by the earth done clear
  C)
                          Frictional force done clear
  D)
                          Balanced forces of nature done clear
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• question_answer16)
  Which of the following statements is NOT true?
  A)
   Friction can be reduced by converting sliding friction into rolling friction. done clear
  B)
                          Friction in air and water can be reduced by streamlining the shape of the objects. done clear
  C)
                          A polished surface will have less friction. done clear
  D)
                          Friction can be reduced to zero. done clear
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• question_answer17)
  What will happen to a moving object if there is no friction?
  A)
   The object will stop. done clear
  B)
                          The object will keep on moving. done clear
  C)
                          The object will change speed. done clear
  D)
                          The object will change direction. done clear
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• question_answer18)
  Which of the following is a disadvantage of friction?
  A)
   It enables the brakes of a car to work. done clear
  B)
                         It allows us to hold a pen. done clear
  C)
                          It helps us to sandpaper a table. done clear
  D)
                          It wears out our shoes. done clear
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• question_answer19)
  Which of the following is NOT an effect of frictional force?
  A)
   The grooves of tyres flattened due to use done clear
  B)
                          A rolling ball coming to a halt done clear
  C)
                          Leaves falling from a tree done clear
  D)
                          The holding of a pencil done clear
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• question_answer20)
  Why are tyres made circular in shape?
  A)
   It is easy to inflate circular tyres. done clear
  B)
                          Rolling friction is less than sliding friction. done clear
  C)
                          Circular tyres dissipate less heat. done clear
  D)
                          Circular tyres easily slow down or stop a vehicle. done clear
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• question_answer21)
  Sudhakar's bicycle was making a lot of squeaking noise. What should he do to stop the squeaking noise?
  A)
   Water                  done clear
  B)
                          Oil          done clear
  C)
                          Sand                                     done clear
  D)
                          Powder  done clear
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• question_answer22)
  A coin flicked on a table will stop. Why?
  A)
   It is heavy. done clear
  B)
                          No force is acting on it. done clear
  C)
                          The earth attracts the coin. done clear
  D)
                          The table exerts a frictional force. done clear
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• question_answer23)
  While walking on ice/why should one take small steps to avoid slipping?
  A)
   Smaller steps ensure larger friction. done clear
  B)
                          Smaller steps ensure smaller friction. done clear
  C)
                          Smaller steps ensure larger distance covered. done clear
  D)
                          Smaller steps ensure smaller distance covered. done clear
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• question_answer24)
  In which of the following activities is friction useful?
  A)
   Driving a car done clear
  B)
                          Sitting on a chair done clear
  C)
                          Rowing a boat done clear
  D)
                          All of the above done clear
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• question_answer25)
  How can friction be decreased?
  A)
   By using smooth surfaces done clear
  B)
                          By using dry surfaces done clear
  C)
                          By increasing the weight of the body done clear
  D)
                          All of the above done clear
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• question_answer26)
  Which of the following is a measure of the force required to keep an object moving with the same speed?
  A)
   Static friction done clear
  B)
                          Sliding friction done clear
  C)
                          Limiting friction done clear
  D)
                          All of the above done clear
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• question_answer27)
  Which of the following activities will not be possible in the absence of friction?
  A)
   Holding a glass done clear
  B)
                          Writing on a paper done clear
  C)
                          Sitting on a chair done clear
  D)
                          All of the above done clear
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• question_answer28)
  Which of the following activities will produce the least amount of frictional force?
  A)
   Walking                               done clear
  B)
                          Running                              done clear
  C)
                          Ice-skating                         done clear
  D)
                          Rowing a boat  done clear
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• question_answer29)
  Which of the following is reduced by the correct measure of air pressure in the tyres?
  A)
   Static friction     done clear
  B)
                          Sliding friction                   done clear
  C)
                          Rolling friction done clear
  D)
                          All of the above done clear
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• question_answer30)
  Which of the following makes it difficult to quickly stop a ship moving in a sea by applying brakes?
  A)
   Low friction       done clear
  B)
                          Excess friction done clear
  C)
                          High speed        done clear
  D)
                          External force done clear
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• question_answer31)
  When a coin and a feather are dropped simultaneously from the same height, the coin strikes the ground first. Why?
  A)
   Gravitational force is less in the case of the coin. done clear
  B)
                          Mass of coin is less. done clear
  C)
                          Frictional force is less in the case of the coin. done clear
  D)
                          Magnetic force is stronger in the case of the coin. done clear
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• question_answer32)
  Why do the soles of our shoes easily wear out?
  A)
   Due to the difference in the material of the sole done clear
  B)
                          Due to poor design done clear
  C)
                          Due to friction done clear
  D)
                          Due to their size done clear
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• question_answer33)
  Harish rolled a small steel ball at one edge of the glass bowl as shown below. If there is no friction between the surfaces of the ball and the bowl, what will happen to the ball?
  A)
   The ball will roll out of the glass bowl near edge 'Q'. done clear
  B)
                          It will stop at centre point 'R' after a number of to-and-fro motions. done clear
  C)
                          It will keep moving between point 'P' and 'Q' and will never stop. done clear
  D)
                          It will not move at all since friction is required for movement. done clear
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• question_answer34)
  When does a body have zero force of friction?
  A)
   When no force is applied on a body at rest done clear
  B)
                          When a large force is applied on a body done clear
  C)
                          When a body is rolling on the surface done clear
  D)
                          When a body is sliding on the surface done clear
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• question_answer35)
  A Look at the figure given below. Which of the following forces is necessary for a person to climb the mountain?
  A)
   Gravitational force done clear
  B)
                          Electrical force done clear
  C)
                          Frictional force done clear
  D)
                          Magnetic force done clear
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• question_answer36)
  Observe the figure given below.
  A)

  X	Y
  Motion	Weight

        done clear
  B)
                        

  X	Y
  Motion	Friction

  done clear
  C)
                        

  X	Y
  Frication	Weight

        done clear
  D)
                        

  X	Y
  Weight	Motion

  done clear
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• question_answer37)
  Anoop and Sohail while studying about friction decided to perform an experiment. They placed equal masses of an ice block and sand paper block on an inclined plastic tray as shown below. What happens when both the blocks start moving?
  A)
   Ice block reaches the bottom of the tray first. done clear
  B)
   Sand paper block reaches the bottom of the tray first. done clear
  C)
   Both the blocks reach the bottom of the tray at the same time. done clear
  D)
   Both the blocks offer the same amount of friction. done clear
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• question_answer38)
  An experiment was conducted to find the amount of force needed to move a 100 g load over different surfaces. Which one of the following scales would show the smallest reading?
  A)
    done clear
  B)
  done clear
  C)
  done clear
  D)
    done clear
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• question_answer39)
  In which of the following does friction play a helpful role?

  (i) Striking a match stick

  (ii) Playing snooker

  (iii) Writing on the blackboard

                 
  A)
                   Only (i) and (ii) done clear
  B)
   Only (ii) and (iii)                               done clear
  C)
   Only (i), and (iii) done clear
  D)
          (i), (ii) and (iii) done clear
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• question_answer40)
  Which of the following shows that friction exists between the two bodies?
  A)
   When the movement is decreased or prevented done clear
  B)
   When there is a constant movement done clear
  C)
   When electromagnetic charges are produced done clear
  D)
   When there is a constant increase in weight done clear
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