Quiz  /  Work Power and Energy Class 12 MCQ Questions With Answers

  • 1. 
    How high up is a 3200-kg plane if it has 960000 J of potential energy?

  • 10 m
  • 30 m
  • 307200000 m
  • 300 m

  • 2. 
    Where is the roller coaster gaining potential energy?

  • A to B
  • B to C
  • C to D
  • The roller coaster is always losing potential energy

  • 3. 
    What effect do external forces like an applied force, friction force, or drag force have?

  • They have no effect on a system's mechanical energy.
  • They convert kinetic energy into potential energy.
  • They convert potential energy into kinetic energy.
  • They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.

  • 4. 
    If there is no friction on this track, at which point would the coaster have the most kinetic energy?

  • A
  • B
  • C
  • D

  • 5. 
    A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

  • The block did not go as high on the other side because gravity pulls down.
  • The block did not go as high on the other side because potential energy always has to decrease.
  • The block did not go as high on the other side because work from friction made the mechanical energy less.
  • The situation as described is impossible to happen.

  • 6. 
    The energy of movement is...?

  • Kinetic
  • Potential

  • 7. 
    Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

  • The marble that rolled down the ramp is moving faster than the marble that fell.
  • The marble that fell down the back of the ramp is moving faster than the marble that rolled.
  • The marble that rolled down the ramp is not moving when it reaches the ground.
  • The two marbles are moving with the same speed.

  • 8. 
    How does conservation of energy explain why something that is falling should speed up?

  • It gains kinetic energy because it gains potential energy.
  • It loses kinetic energy because no work was done on it.
  • It gains kinetic energy because it loses potential energy.
  • It loses kinetic energy because the Earth gains potential energy.

  • 9. 
    Which one is NOT a simple machine?

  • Lever
  • Gear
  • Wedge
  • Pulley

  • 10. 
    Kinetic energy is associated with ---.

  • speed
  • position
  • direction
  • temperature

  • 11. 
    Energy that is stored is called...

  • Kinetic
  • Potential

  • 12. 
    Potential energy is associated with ---.

  • speed
  • position
  • direction
  • temperature

  • 13. 
    What is g on Earth?

  • 9.8 m/s/s
  • 9.8 m/s
  • 42 m*s
  • 42 m/s/s

  • 14. 
    Suppose a cart has a kinetic energy of 0.5 J. If you add enough mass to double the mass and make the cart go three times as fast, its kinetic energy is now ---.

  • 6 J
  • 3 J
  • 18 J
  • 9 J

  • 15. 
    If a 1300-kg car has been lifted so it has 19500 J of potential energy, it was lifted up ---.

  • 1.5 m
  • 150 m
  • 15 m
  • 0.67 m

  • 16. 
    A crane carries an 8-m long steel girder weighing 2600 N out 12 m to the end of the crane. The crane did ___ of work.

  • 0 J
  • 2600 J
  • 20800 J
  • 31200 J

  • 17. 
    What is NOT one of the six simple machines?

  • Lever
  • Pulley
  • Hinge
  • Screw

  • 18. 
    A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs?

  • 400 J
  • 1200 J
  • 200 J
  • 120 J

  • 19. 
    How much work is being done with 200 N of force over 426 meters?

  • 85,200 J
  • 45,620 J
  • 90,480 J
  • 62,329 J

  • 20. 
    What is the equation for power and energy?

  • P = E/t
  • E = P/t
  • T = P x E
  • P = W/t

  • 21. 
    The SI unit for power is...?

  • Watts
  • Joules
  • Newtons
  • Meters

  • 22. 
    A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.

  • 0 J
  • 39000 J
  • 20800 J
  • 2600 J
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