This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Physics Part I > Class 11 Physics (Part I) Chapter 4 Work – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 14 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The change in position relative to another object A) Motion. B) Work. C) Force. D) Power. Show Answer Correct Answer: A) Motion. 2. Nearing the end of the shockwave ride, a braking system exerts an applied force upon the coaster car to bring it to a stop. Determine the type of work done of the applied force? A) Positive Work. B) Maximum Work. C) Negative Work. D) Zero Work. Show Answer Correct Answer: C) Negative Work. 3. When force and displacement are in the same direction, the work done on the object is ..... A) It depends on the problem. B) Neither, we are concerned with magnitude only. C) Negative. D) Positive. Show Answer Correct Answer: D) Positive. 4. What is the relationship between maximum kinetic energy and maximum potential energy in a conservative (isolated) system? A) They are equal at any given point. B) They are independent of each other. C) Potential energy is always greater than kinetic energy. D) Kinetic energy is always greater than potential energy. Show Answer Correct Answer: A) They are equal at any given point. 5. A shot is fired at 30$^\circ$ with the vertical from a point on the ground with kinetic energy K. If air resistance is ignored, the kinetic energy at the top of the trajectory is A) K. B) K/4. C) 3K/2. D) K/2. Show Answer Correct Answer: B) K/4. 6. Gravitational potential energy of an object is dependent on A) 1 the volume of the object. B) 2 the mass and height of the object. C) 3 the mass & speed of the object. D) 4 the velocity of the object. Show Answer Correct Answer: B) 2 the mass and height of the object. 7. How does conservation of energy explain why something that is falling should speed up? A) It loses kinetic energy because no work was done on it. B) It gains kinetic energy because it loses potential energy. C) It gains kinetic energy because it gains potential energy. D) It loses kinetic energy because the Earth gains potential energy. Show Answer Correct Answer: B) It gains kinetic energy because it loses potential energy. 8. It takes 545 J to operate a TV for 1 min. How much power is need to to operate the TV for this time period? A) 32700 W. B) 0.1 W. C) 9.1 W. D) 545 W. Show Answer Correct Answer: C) 9.1 W. 9. A body is falling freely under the action of gravity alone in vacuum. Which of the following quantities remain constant during the fall? A) Total Mechanical Energy. B) Total Potential Energy. C) Total gravitational Energy. D) Total Kinetic Energy. Show Answer Correct Answer: A) Total Mechanical Energy. 10. Explain how energy can be transformed from one form to another. A) Energy can be transformed from potential to kinetic to mechanical to electrical energy. B) Energy transformation is impossible in closed systems. C) Energy can only be created, not transformed. D) Energy can only exist in one form at a time. Show Answer Correct Answer: A) Energy can be transformed from potential to kinetic to mechanical to electrical energy. 11. The efficiency of a machine is 80%, and it delivers 400 W of power. What is the input power? A) 800 W. B) 320 W. C) 500 W. D) 480 W. Show Answer Correct Answer: C) 500 W. 12. An object falls from the top of a building that is 25 m high. Air resistance is negligible. What is the speed of the object when it hits the ground? A) 25 m/s. B) 10 m/s. C) 22 m/s. D) 625 m/s. Show Answer Correct Answer: C) 22 m/s. 13. What is the kinetic energy of a 3 kg toy car with a velocity of 4 m/s? A) 24 J. B) 6 J. C) 12 J. D) 48 J. Show Answer Correct Answer: A) 24 J. 14. "A leaf falling down from the tree" . In what type of mechanical energy does it fall? A) Potential Energy. B) Kinetic Energy. C) Both. D) None of the above. Show Answer Correct Answer: B) Kinetic Energy. 15. How much work is done in moving 2 columns of charge across two points having a potential difference of 12V A) 18 Joule. B) 24 Joule. C) 12 Joule. D) 6 Joule. Show Answer Correct Answer: B) 24 Joule. 16. . A force of 2 N acts parallel to the displacement of a particle for a distance of 10 m. What is the change in the kinetic energy of the particle? A) 5J. B) 20J. C) 10J. D) None of the above. Show Answer Correct Answer: B) 20J. 17. Terri has a mass of 85 kg and is standing on a diving board that is 8 meters high. How much gravitational potential energy does she have? A) 68 J. B) 54, 400 J. C) 106.25 J. D) 6800 J. Show Answer Correct Answer: D) 6800 J. 18. Which one of the following is incorrect? Wnc is ..... A) A sum of works. B) Equal to $\Delta$Ek. C) Equal to the change in mechanical energy of an object. D) The total work done by a sum of non-conservative forces. Show Answer Correct Answer: C) Equal to the change in mechanical energy of an object. 19. Which of the following are required in order to have kinetic energy? A) Acceleration. B) Height. C) Time. D) Speed or velocity. Show Answer Correct Answer: D) Speed or velocity. 20. TRUE or FALSE:POTENTIAL Energy is the form of energy that an object has when in motion. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 21. Which of the following would NEVER happen in a perfectly inelastic collision? A) Objects move with a common velocity. B) Objects are deformed to some degree. C) Objects stick together after collision. D) Objects move in opposite directions. Show Answer Correct Answer: D) Objects move in opposite directions. 22. If you want to double the gravitational potential energy of an object near the Earth's surface, what should you do? A) Double the acceleration due to gravity. B) Double the object's height. C) Double the object's speed. D) Double the object's mass. Show Answer Correct Answer: B) Double the object's height. 23. A 50.0 kg student climbs 5.00 m up a rope at a constant speed. If the student's power output is 200.0 W, how long does it take the student to climbs the rope? (Use g = 9.8 m/s$^{2}$.) A) 3.64 s. B) 12.25 s. C) 1.25 s. D) 24.5 s. Show Answer Correct Answer: B) 12.25 s. 24. What is the definition of work in physics? A) Writing reports in a physics lab. B) Solving equations in physics. C) Measuring the temperature of a system. D) Applying force over a distance to a system. Show Answer Correct Answer: D) Applying force over a distance to a system. 25. Push or pulling forces can change an objects motion. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 26. What is a non-conservative (non-isolated) system in physics? A) A system that has no energy. B) A system that only gains energy through work. C) A system that may lose energy through work. D) A system that has constant energy. Show Answer Correct Answer: C) A system that may lose energy through work. 27. If you lift a box from the floor to a height of 1m and then carry the for for 10m, you do work only when you CARRY the box. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 28. Two balls, P and Q, are dropped simultaneously from the same height. Ball P has TWICE the mass of ball Q. Ignore the effects of air friction. Just before the balls hit the ground, the kinetic energy of ball P is x. The kinetic energy of ball Q, in terms of x, will be ..... A) $\frac{1}{4}x$. B) $\frac{ }{ }2x$. C) $\frac{1}{2}x$. D) $\frac{ }{ }x$. Show Answer Correct Answer: C) $\frac{1}{2}x$. 29. A 10 kg ball has a height of 2 m, while a 5 kg ball has a height of 5 m. Which ball has more potential energy? A) The 5 kg ball. B) The 10 kg ball. C) They both have the same potential energy. D) Impossible to predict. Show Answer Correct Answer: A) The 5 kg ball. 30. What should you always check when solving numerical problems? A) Only the time. B) Units of mass, distance, and force. C) Only the distance. D) Only the force. Show Answer Correct Answer: B) Units of mass, distance, and force. 31. A constant force on an object given by-product of force and distance moved by object in direction of force is termed as A) Work done. B) Power. C) Energy. D) None of the above. Show Answer Correct Answer: A) Work done. 32. Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required? A) 400 watts. B) 104 watts. C) 50 watts. D) 100 watts. Show Answer Correct Answer: D) 100 watts. 33. An elevator weighing 500kg is to be lifted up at a constant velocity of 0.20 m/s. The minimum horsepower of the motor (G= 9.8 m/sec) A) 2 HP. B) 2.2 HP. C) 1.3 HP. D) 1.5 HP. Show Answer Correct Answer: C) 1.3 HP. 34. The product of force and displacement of an object in motion. A) Power. B) Force. C) Energy. D) Work. Show Answer Correct Answer: D) Work. 35. Total energy T.E= A) P.E+k.E. B) Mass/Area. C) W/T. D) None of them. Show Answer Correct Answer: A) P.E+k.E. 36. Which type of reaction results in a heat flow out of the system? A) Exothermic reaction. B) Endothermic reaction. C) Oxidation reaction. D) Combustion reaction. Show Answer Correct Answer: A) Exothermic reaction. 37. If you go twice as fast, the kinetic energy becomes: A) 2 times smaller. B) 4 times smaller. C) 2 times bigger. D) 4 times bigger. Show Answer Correct Answer: D) 4 times bigger. 38. A resource that takes millions of years to form is called a ..... A) Renewable resource. B) Nonrenewable resource. C) All the above. D) None of the above. Show Answer Correct Answer: B) Nonrenewable resource. 39. A softball player catches a ball of mass m, which is moving towards her with horizontal speed V. While bringing the ball to rest, her hand moved back a distance d. Assuming constant deceleration, the horizontal force exerted on the ball by the hand is: A) $\frac{mv^2}{2d}$. B) $\frac{mv}{d}$. C) $\frac{2mv}{d}$. D) $\frac{mv^2}{d}$. Show Answer Correct Answer: A) $\frac{mv^2}{2d}$. 40. When an object is carried at a constantvelocity by a force, A) The work done is maximum on theobject. B) The work done is 100 % on theobject. C) The work is done minimum on theobject. D) No work is done on theobject. Show Answer Correct Answer: D) No work is done on theobject. 41. What effect do external forces like an applied force, friction force, or drag force have? A) They have no effect on a system's mechanical energy. B) They convert kinetic energy into potential energy. C) They convert potential energy into kinetic energy. D) They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system. Show Answer Correct Answer: D) They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system. 42. If the mass of an object is halved the potential energy will be A) Unchanged. B) Tripled. C) Doubled. D) Halved. Show Answer Correct Answer: D) Halved. 43. What happens to the kinetic energy of an object if its velocity is doubled? A) It halves. B) It quadruples. C) It doubles. D) It remains the same. Show Answer Correct Answer: B) It quadruples. 44. Jane, a skater who is moving at high speed needs a certain amount of force to stop her. When will more stopping force be needed with? A) Less mass. B) Less velocity. C) Less stopping time. D) Less momentum. Show Answer Correct Answer: C) Less stopping time. 45. A ball drops onto a horizontal surface and bounces elastically.What happens to the kinetic energy of the ball during the very short time that it is in contact with the surface? A) Most of the kinetic energy is lost as heat and sound. B) The kinetic energy decreases to zero and then returns to its original value. C) The kinetic energy remains constant because it is an elastic collision. D) The kinetic energy remains constant in magnitude but changes direction. Show Answer Correct Answer: B) The kinetic energy decreases to zero and then returns to its original value. 46. When a force is applied at an angle to the direction of motion, which component of the force is used to calculate work? A) The parallel component. B) The perpendicular component. C) The net force. D) Both parallel and perpendicular components. Show Answer Correct Answer: A) The parallel component. 47. In which unit is work done measured? A) Newton-metres (N m). B) Watts (W). C) Newtons (N). D) Meters (m). Show Answer Correct Answer: A) Newton-metres (N m). 48. A boy lifts a 30N dragon 2 meters above the ground. How much work did the boy do on the dragon? A) 150 J. B) 15 J. C) 60 J. D) 600 J. Show Answer Correct Answer: C) 60 J. 49. J of work is done by a person who uses a force of 50N to move a box, how far does it go? A) 0.1 m. B) 25, 000 m. C) 10 m. D) 10 J. Show Answer Correct Answer: C) 10 m. 50. A toy plane has a potential energy of 100 J. If the height decreases by a factor of 4, what is the new potential energy? A) 1600 J. B) 400 J. C) 25 J. D) 6.25 J. Show Answer Correct Answer: C) 25 J. 51. ..... is defined as the rate at which work is done. A) Kinetic Energy. B) Efficiency. C) Work. D) Power. Show Answer Correct Answer: D) Power. 52. A frisbee has 100 J of kinetic energy. If its speed decreases by a factor of 9, then what is the new kinetic energy? A) 1.23 J. B) 11.11 J. C) 900 J. D) 8100 J. Show Answer Correct Answer: A) 1.23 J. 53. As a falling apple approaches the ground, its kinetic energy A) Increases. B) Decreases. C) Stays the same. D) None of the above. Show Answer Correct Answer: A) Increases. 54. A lift in a hotel can raise 8 people through a height of 20 m in 5 seconds. The lift plus passengers has a mass of 800 kg. What is the power of the lift motor? A) 160 000 W. B) 32 000 W. C) 8 000 W. D) 40 000 W. E) 40 W. Show Answer Correct Answer: B) 32 000 W. 55. Standard unit for Power A) Watt. B) Ampere. C) Joule. D) Newton. Show Answer Correct Answer: A) Watt. 56. The equation for WORK is A) Work = force x distance. B) Work = distance x time. C) Work = power / time. D) Work = power x mass. Show Answer Correct Answer: A) Work = force x distance. 57. When negative work (by friction or external forces) is done on a system, the total mechanical energy will ..... A) Increase. B) Decrease. C) Remain the same. D) None of the above. Show Answer Correct Answer: B) Decrease. 58. A 1.5 m high person is holding a 20 kg trunk on his head and is standing at a roadways bus-terminal. How much work is done by the person? A) 13J. B) 8J. C) 9J. D) 0J. Show Answer Correct Answer: D) 0J. 59. Work is measured in A) Joules. B) Newtons. C) Watts Joules. D) Watts. Show Answer Correct Answer: A) Joules. 60. An 80 N rope tension force is used to slowly pull a wagon 50 m up a hill. Calculate the work done by the rope if it pulls parallel to the hill A) 2000 J. B) 4000 J. C) 6000 J. D) None of the above. Show Answer Correct Answer: B) 4000 J. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Physics (Part I) Chapter 4 Work Quiz 1Class 11 Physics (Part I) Chapter 4 Work Quiz 2Class 11 Physics (Part I) Chapter 4 Work Quiz 3Class 11 Physics (Part I) Chapter 4 Work Quiz 4Class 11 Physics (Part I) Chapter 4 Work Quiz 5Class 11 Physics (Part I) Chapter 4 Work Quiz 6Class 11 Physics (Part I) Chapter 4 Work Quiz 7Class 11 Physics (Part I) Chapter 4 Work Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books