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WORK POWER AND ENERGY MCQs

Total Questions : 33 | Page 2 of 4 pages
Question 11. How does conservation of energy explain why something that is falling should speed up?
  1.    It gains kinetic energy because it gains potential energy.
  2.    It loses kinetic energy because no work was done on it.
  3.    It gains kinetic energy because it loses potential energy.
  4.    It loses kinetic energy because the Earth gains potential energy.
 Discuss Question
Answer: Option C. -> It gains kinetic energy because it loses potential energy.
Question 12. What effect do external forces like an applied force, friction force, or drag force have?
  1.    They have no effect on a system's mechanical energy.
  2.    They convert kinetic energy into potential energy.
  3.    They convert potential energy into kinetic energy.
  4.    They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.
 Discuss Question
Answer: Option D. -> They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.
Question 13. How high up is a 3200-kg plane if it has 960000 J of potential energy?
  1.    10 m
  2.    30 m
  3.    307200000 m
  4.    300 m
 Discuss Question
Answer: Option B. -> 30 m
Question 14. What are two things required for work to be done? Check all that apply
  1.    Force
  2.    Distance
  3.    Constant Speed
  4.    Both A & B
 Discuss Question
Answer: Option D. -> Both A & B
Question 15. Which of the following is defined as work done per unit time?
  1.    energy
  2.    force
  3.    power
  4.    work
 Discuss Question
Answer: Option C. -> power
Question 16. Light is an example of _________
  1.    thermal energy
  2.    radiant energy
  3.    mechanical energy
  4.    nuclear energy
 Discuss Question
Answer: Option B. -> radiant energy
Question 17. Which energy-conversion chain occurs whenever coal is burned to create steam to spin the generator at a power station?
  1.    chemical to mechanical to potential
  2.    thermal to chemical to mechanical to electrical
  3.    chemical to thermal to mechanical to electrical
  4.    chemical to chemical to mechanical to radiant
 Discuss Question
Answer: Option C. -> chemical to thermal to mechanical to electrical
Question 18. What has to happen when a force is exerted on an object for work to be done?
  1.    the object moves
  2.    the object stays still
  3.    the object is heavy
  4.    none of these
 Discuss Question
Answer: Option A. -> the object moves
Question 19. The amount by which a machine multiplies input force is known as the 
  1.    work.
  2.    power.
  3.    output force.
  4.    mechanical advantage.
 Discuss Question
Answer: Option D. -> mechanical advantage.
Question 20. 50 J of work is done lifting a 20
  1.    2.5 m
  2.    3.5 m
  3.    0.4 m
  4.    25 m
 Discuss Question
Answer: Option A. -> 2.5 m

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