8th Class Science Friction Question Bank

done Friction IIT JEE Objective Problems Total Questions - 8

• question_answer1)
  Which of the following mechanical systems will produce the maximum amount of heat because of friction?
  A)
  done clear
  B)
    done clear
  C)
    done clear
  D)
    done clear
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• question_answer2)
  The given figure shows three identical carom boards labeled I, II, and III. Sand particles have been poured on board I and oil has been poured on board II. Equal forces are applied on three identical pucks on the three carom boards such that their speeds on the three carom boards are \[{{v}_{1}},{{v}_{2}}\]and \[{{v}_{3}}\] respectively. The relation among the speeds of the pucks on the three carom boards is
  A)
   \[{{v}_{1}}>{{v}_{3}}>{{v}_{2}}\]                              done clear
  B)
   \[{{v}_{1}}<{{v}_{3}}<{{v}_{2}}\] done clear
  C)
   \[{{v}_{1}}>{{v}_{2}}>{{v}_{3}}\]              done clear
  D)
   \[{{v}_{1}}<{{v}_{2}}<{{v}_{3}}\] done clear
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• question_answer3)
  A car designer designed four cars labelled as I, II, III, and IV. The shapes of the cars are shown in given figure. On a test drive, these cars are moving with the same speed on a highway. The tank of each car is filled with the same quantity of fuel. In covering equal distances, least fuel is consumed by car
  A)
   I                                              done clear
  B)
   II                  done clear
  C)
   III                                           done clear
  D)
   IV done clear
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• question_answer4)
  Arpita observes that the match stick is not catching fire even when she is rubbing it gently against the comer of the matchbox. The match box had been used many times before also. The possible reason for the given problem is that the
  A)
   Matchbox has lost its chemical done clear
  B)
   Matchbox has lost its roughness done clear
  C)
   Quality of wood used in the match stick is not good done clear
  D)
   Quality of chemical used in the match stick is not good done clear
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• question_answer5)
  The picture of four people pushing four heavy boxes of equal weight on a surface in four different situations I, II, III, and IV respectively, is shown in the given figure. The maximum and the minimum friction offered by the ground will be for the situations
  A)
   I and II                 done clear
  B)
   III and IV          done clear
  C)
   II and III               done clear
  D)
   I and IV done clear
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• question_answer6)
  Atul noticed that the joints of the main door of his house produce a noise every time the gate is opened or closed. He wants to reduce the sound by applying something to the joints. To reduce the noise of the door, Ami must
  A)
   Drop water in the joints                     done clear
  B)
   Spread sand on the joints done clear
  C)
   Apply grease on the joints         done clear
  D)
   Put chalk powder on the joints done clear
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• question_answer7)
  A cyclist moving on a road saw a ditch at a distance ahead of him. He firmly applied the brake that caused the cycle to stop almost instantaneously. The applied opposing force that causes the bicycle to come to rest acts between
  A)
   Hand and Brake               done clear
  B)
   Leg and Paddle     done clear
  C)
   Pads and Tyre                   done clear
  D)
   Tyre and Road done clear
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• question_answer8)
  Amit puts some sand in his hands and tries to grip a glass tumbler. He then repeats the same by putting chalk power, mustard oil, and water on his palms respectively. For a proper grip, Amit should avoid gripping the tumbler with
  A)
   Water on palms                            done clear
  B)
   Sand on palms done clear
  C)
   Mustard oil on palms             done clear
  D)
   Chalk powder on palms done clear
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