8th Class Science Friction Question Bank

done Friction Conceptive Objective Problems Total Questions - 12

• question_answer1)
  Four cubical boxes, made up of the same material, are placed on the ground and are pushed with a constant force, \[{{d}_{1}},{{d}_{2}},{{d}_{3}}\], and \[{{d}_{4}}\] are the distances travelled by the boxes. They are related as  \[{{d}_{3}}>{{d}_{2}}>{{d}_{4}}>{{d}_{1}}\]. The sides \[{{a}_{1}},{{a}_{2}},{{a}_{3}},\] and \[{{a}_{4}}\] of the respective boxes are related as
  A)
   \[{{a}_{1}}>{{a}_{2}}>{{a}_{3}}>{{a}_{4}}\]          done clear
  B)
   \[{{a}_{1}}>{{a}_{4}}>{{a}_{2}}>{{a}_{3}}\] done clear
  C)
   \[{{a}_{3}}>{{a}_{2}}>{{a}_{4}}>{{a}_{1}}\] done clear
  D)
   \[{{a}_{4}}>{{a}_{3}}>{{a}_{2}}>{{a}_{1}}\] done clear
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• question_answer2)
  Four similar boxes are labelled I, II, III, and IV. The masses of I and III are equal and the masses of II and IV are equal. The mass of box I is smaller than that of box II. Boxes I and II are placed in a grass field and boxes III and IV are placed on a marble floor. Which box requires the maximum force to be moved?
  A)
   I                                              done clear
  B)
   II done clear
  C)
   III                                           done clear
  D)
   IV done clear
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• question_answer3)
  Vishnu and Mahesh are pushing a heavy box placed on a floor, as shown in the given figure. The arrow over the box shows the direction of motion of the box. Vishnu is applying a force of magnitude \[{{F}_{v}}\] and Mahesh is applying a force of magnitude \[{{F}_{m}}\]. Which of the following pairs of forces have the same direction?
  A)
    \[{{F}_{v}}\]and frictional force done clear
  B)
    \[{{F}_{m}}\]and frictional force done clear
  C)
   \[{{F}_{v}}\]and gravitational force done clear
  D)
   \[{{F}_{m}}\] and gravitational force done clear
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• question_answer4)
  Ted learns about force of friction. He tries out different ways of reducing as well as increasing the friction on the surface of his driveway. In order to increase the friction on the surface of the driveway, Ted should
  A)
   Cover it with small pebbles done clear
  B)
   Cover it with wax done clear
  C)
   Pour water on it done clear
  D)
   Pour oil on it done clear
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• question_answer5)
  In order to reduce the friction of a wheel-axle, a bicycle uses
  A)
   gears                    done clear
  B)
   brakes done clear
  C)
   pedals                  done clear
  D)
   ball bearings done clear
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• question_answer6)
  Joe slides a plank of wood over the floor. As the wood plank slides over the floor, its speed can be increased the most if
  A)
   The floor is lubricated done clear
  B)
   It is coated with oil done clear
  C)
   Balls are placed under it done clear
  D)
   It is smoothed with sand paper done clear
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• question_answer7)
  Which of the following surfaces will have the minimum friction?
  A)
   wet towel                          done clear
  B)
   oily marble floor done clear
  C)
   surface of cardboard done clear
  D)
   surface of a new tyre done clear
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• question_answer8)
  If the force of friction were not to exist, then it would be almost impossible to both
  A)
   Speak and listen     done clear
  B)
   Write and walk done clear
  C)
   Speak and walk                done clear
  D)
   Write and listen done clear
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• question_answer9)
  There are three types of friction, namely sliding, static, and rolling. They are respectively denoted as \[{{f}_{sl}},{{f}_{st,}}\] and \[{{f}_{roll}}\]. On a given surface, the given frictional forces are related as
  A)
   \[{{f}_{sl}}>{{f}_{st}}>{{f}_{roll}}\]          done clear
  B)
   \[{{f}_{st}}>{{f}_{sl}}>{{f}_{roll}}\] done clear
  C)
   \[{{f}_{st}}>{{f}_{roll}}>{{f}_{sl}}\]          done clear
  D)
   \[{{f}_{sl}}>{{f}_{roll}}>{{f}_{st}}\] done clear
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• question_answer10)
  In order to move a stationary object, an interlocking between the two surfaces must be overcome. The minimum force required to overcome this interlocking is known as
  A)
   Static friction                     done clear
  B)
   Rolling friction done clear
  C)
   Sliding friction                   done clear
  D)
   Kinetic friction done clear
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• question_answer11)
  A ball is rolled upward along an inclined plane. After reaching a certain height from the ground, it rolls down along the plane. During the motion of the ball along the inclined plane, the force of friction
  A)
   Always opposes the motion done clear
  B)
   Always facilitates the motion done clear
  C)
   First opposes and then facilitates the motion done clear
  D)
   First facilitates and then opposes the motion done clear
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• question_answer12)
  A formula one car is shown in the given figure. Formula one (F1) is one of the most famous and fastest racing events of the world. In this sport, cars can acquire speeds as high as 320 km/hr. One of the reasons of the high speeds is the design of the F1 cars. The shape of the car helps in
  A)
   Reducing the air drags done clear
  B)
   Reducing the car weight done clear
  C)
   Increasing the car efficiency done clear
  D)
   Increasing the consumption fuel done clear
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