Quiz  /  Work Done By Constant Force MCQ

  • 1. 
    If the unit of force and length each be increased by four times, then the unit of energy is increased by

  • 16 times
  • 8 times
  • 2 times
  • 4 times

  • 2. 
    A man pushes a wall and fails to displace it. He does

  • Negative work
  • Positive but not maximum work
  • No work at all
  • Maximum work

  • 3. 
    When a retarding force is applied to stop a train, the train stops after 80 m. If the speed is doubled, then for the same retarding force, the distance when the train stops would be

  • The same
  • Doubled
  • Halved
  • Four times

  • 4. 
    You lift a heavy book from the floor of the room and keep it in the bookshelf having a height of 2 m. This process takes 5 seconds. The work done by you will depend on

  • Mass of the book and the time taken
  • Weight of the book and height of the bookshelf
  • Height of the bookshelf and the time taken
  • Mass of the book, height of the bookshelf and the time taken

  • 5. 
    A body of mass m kg is lifted by a man to a height of one metre in 30 seconds. Another man lifts the same mass to the same height in 60 seconds. The work done by them are in the ratio

  • 1:2
  • 1:1
  • 2:1
  • 4:1

  • 6. 
    Which of the following is a scalar quantity

  • Displacement
  • Electric field
  • Acceleration
  • Work

  • 7. 
    A force of 5 N acts on a 15 kg body initially at rest. The work done by the force during the first second of motion of the body is

  • 5 J
  • ⅚ J
  • 6 J
  • 75 J

  • 8. 
    A force of 5 N, making an angle θ with the horizontal, acting on an object displaces it by 0.4 m along the horizontal direction. If the object gains kinetic energy of 1 J, the horizontal component of the force is

  • 1.5 N
  • 2.5 N
  • 3.5 N
  • 4.5 N

  • 9. 
    The work done against gravity in taking 10 kg mass at 1 m height in 1 sec will be

  • 49 J
  • 98 J
  • 196 J
  • None of these
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