This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Physics Part I > Class 11 Physics (Part I) Chapter 4 Work – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 21 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does the work-energy theorem state? A) Work done is equal to force times distance. B) Energy cannot be created or destroyed. C) The change in kinetic energy is equal to the work done by the net force. D) Kinetic energy is always conserved. Show Answer Correct Answer: C) The change in kinetic energy is equal to the work done by the net force. 2. A spring stretched twice as far will have ..... the amount of Spring Potential Energy stored. A) The same as. B) Twice the. C) Four times. D) One fourth. E) Half the. Show Answer Correct Answer: C) Four times. 3. One of the tallest radio towers is in Fargo, North Dakota. The tower is 629 m tall. If a bird lands on top of the tower, so that the gravitational potential energy associated with the bird is 2033 J, what is its mass? Let g = 9.8N/kg A) 0.330 kg. B) 12, 531, 819 kg. C) 1, 278, 757 kg. D) 3.25 kg. E) 0.309 kg. Show Answer Correct Answer: A) 0.330 kg. 4. When two stationary objects are suddenly pushed by a spring between them, what happens to the total momentum of the system? Assume that no friction acts on the two objects. A) Remains the same. B) Increases then decreases. C) Increases. D) Decreases. Show Answer Correct Answer: A) Remains the same. 5. A ball thrown into the air has a maximum height of 10 meters. Where in its rise to power will the balls kinetic energy and potential energy be equal? A) They are never equal. B) 0 m. C) 5 m. D) 10 m. Show Answer Correct Answer: C) 5 m. 6. How do you calculate power if 100 J of work is done in 5 seconds? A) 25 W. B) 15 W. C) 20 W. D) 50 W. Show Answer Correct Answer: C) 20 W. 7. Which of the following statements explains the properties and effects of conservative forces? Conservative forces would ..... A) Result in work that are path dependent. B) Result in work that are path independent. C) Lead to work that do not conserve energy. D) Mean the initial and final energies are not the same. Show Answer Correct Answer: B) Result in work that are path independent. 8. ENERGY is defined as ..... A) The rate of work. B) The ability to generate power. C) The rate of power. D) The ability to do work. Show Answer Correct Answer: D) The ability to do work. 9. Where would a car traveling on a roller coaster track have the most potential energy? A) At the bottom. B) It is always the same. C) Halfway to the bottom. D) Halfway to the top. E) At the top. Show Answer Correct Answer: E) At the top. 10. What is the power output of a 60 Watt light bulb in terms of energy used per second? A) 0.6 Joules. B) 6 Joules. C) 600 Joules. D) 60 Joules. Show Answer Correct Answer: D) 60 Joules. 11. Suppose you want to calculate how much work it takes to lift a 160 N barbell. Besides the mass of the barbell, what other information do you need to know? A) How quickly the lifts are being done. B) How high the barbell is being lifted. C) The shape of the weights. D) The strength of the person diong the lifting. Show Answer Correct Answer: B) How high the barbell is being lifted. 12. A consumer's kilowatt-hour meter displays 10456 at the start of a billing period and 10966 at the end of the period. How much kW hrs are consumed in that period? A) 21422. B) 510. C) 10966. D) 10456. Show Answer Correct Answer: B) 510. 13. Which of the following statements is true regarding a rider in a roller coaster cart moving with a constant speed through a loop? A) The rider is accelerating. B) The sum of all forces acting on the rider is zero. C) Gravity is the only force doing work on the rider. D) There are two forces acting on the rider, but neither does any work on the rider. Show Answer Correct Answer: A) The rider is accelerating. 14. A car accelerates uniformly from rest. When does the car require the greatest power? A) The question is misleading because the power required is constant. B) When the car reaches half its maximum speed. C) Just as the car reaches its maximum speed. D) When the car first accelerates from rest. Show Answer Correct Answer: C) Just as the car reaches its maximum speed. 15. Both work and energy are measured in A) Seconds. B) Meters. C) Joules. D) Newtons. Show Answer Correct Answer: C) Joules. 16. A 1200 kg roller coaster moves at a velocity of 10 m/s while it is 8 m in the air. What is the total mechanical energy of the roller coaster? A) 196000 J. B) 96000 J. C) 154080 J. D) 120000 J. Show Answer Correct Answer: C) 154080 J. 17. When a body slides against a rough horizontal surface, the work done by friction is A) Constant. B) Zero. C) Negative. D) Positive. Show Answer Correct Answer: C) Negative. 18. Power is a ..... dependent quantity. A) Volume. B) Outlet. C) Energy source. D) Time. Show Answer Correct Answer: D) Time. 19. A 2 kg object is held 5 meters above the ground. What is the gravitational potential energy of the object? A) 5 J. B) 100 J. C) 10 J. D) 20 J. Show Answer Correct Answer: B) 100 J. 20. How far does a car that weighs 5, 000 N move if 18, 000 J of work are done on it? A) 3.6 m. B) 3.2 m. C) 3.8 m. D) 3.7 m. Show Answer Correct Answer: A) 3.6 m. 21. Large man:Fw=1000N, time = 5 secondsSmall child:Fw=400N, time = 1 secondBoth people walked up the same set of steps (1 m). Who developed the most power? A) Large man because he did more work in less time. B) Small child because she did less work in less time. C) Large man because he did less work in more time. D) Small child because she did more work in less time. Show Answer Correct Answer: B) Small child because she did less work in less time. 22. The rate of doing work is called . A) Power. B) Energy. C) Force. D) Displacement. Show Answer Correct Answer: A) Power. 23. If a pump can raise 1000L of water per minute to a height of 45m, then the horsepower of the pump is A) 9 HP. B) 10 HP. C) 24.3 HP. D) None of these. Show Answer Correct Answer: B) 10 HP. 24. A concrete block is pulled 7.00 m across a frictionless surface by means of a rope as shown in the figure. The tension in the rope is 40.00 N and the net work done on the block is 247.00 J. Wat angle does the rope make with the horizontal? A) 62.50$^\circ$. B) 41.25$^\circ$. C) 47.30$^\circ$. D) 28.10$^\circ$. Show Answer Correct Answer: D) 28.10$^\circ$. 25. A 45N girl sits on a 8N bench that is .5 m tall. How much work is done on the bench? A) 22.5 J. B) 26.5 J. C) 0 J. D) 18.5 J. Show Answer Correct Answer: C) 0 J. 26. An engine lift 10$^{3}$ kg of coal per hour from a mine 360 m deep. Calculate the power of the engine ..... [Take g=10 N/kg] A) 100 kW. B) 10 kW. C) 1 kW. D) 0.1 kW. Show Answer Correct Answer: C) 1 kW. 27. You apply a 25 N force to a crate causing it to displace by 5 meters., it takes 4 seconds to push the crate across the room. What average power was generated? A) 500 W. B) 31.25 W. C) Not enough information is provided. D) 125 W. Show Answer Correct Answer: B) 31.25 W. 28. Define a machine A) Device that makes work easy. B) Device that helps in conversion of energy. C) Device that is operated using electricity. D) None of the above. Show Answer Correct Answer: A) Device that makes work easy. 29. If we doubled the velocity of the of an object without changing its mass then its new K.E will become A) One-fourth of the initial K.E. B) Half of the initial K.E. C) 2 times that of initial K.E. D) 4 times that of initial K.E. Show Answer Correct Answer: D) 4 times that of initial K.E. 30. You are traveling along a freeway at 65 mi/h; your car has kinetic energy. You suddenly skid to a stop because of congested traffic. What happened to the kinetic energy your car just had? A) It is all in internal energy in the road. B) It is all in internal energy in the tires. C) Some of it has transformed to internal energy for the tires and the road, and some of it transferred away by sound energy and thermal energy into the air. D) It was destroyed. Show Answer Correct Answer: C) Some of it has transformed to internal energy for the tires and the road, and some of it transferred away by sound energy and thermal energy into the air. 31. A car of mass 1500 kg has a speed of 20 m/s. It accelerates until its speed is 25 m/s. What is the increase in the kinetic energy of the car? A) 340 kJ. B) 170 kJ. C) 19 kJ. D) 38 kJ. Show Answer Correct Answer: B) 170 kJ. 32. What is the mass of a moving object that has 100 Joules of kinetic energy and moves at a velocity of 2 m/s? A) 100 kg. B) 200 kg. C) 25 kg. D) 50 kg. Show Answer Correct Answer: D) 50 kg. 33. According to the notes, a disadvantage of solar power is: A) The panels are ugly. B) The panels are shiny. C) The panels are expensive. D) The sun is not free. Show Answer Correct Answer: C) The panels are expensive. 34. What can be said about the total energy in the universe? A) It tends to increase. B) It is always zero. C) It is conserved. D) It tends to decrease. Show Answer Correct Answer: C) It is conserved. 35. Which car is more powerful according to the video? A) A truck. B) A race car. C) A family car. D) A bicycle. Show Answer Correct Answer: B) A race car. 36. How does height affect potential energy? A) Height directly affects potential energy; higher height results in greater potential energy. B) Height has no effect on potential energy. C) Height only affects kinetic energy, not potential energy. D) Potential energy decreases with increased height. Show Answer Correct Answer: A) Height directly affects potential energy; higher height results in greater potential energy. 37. What are the factors that can affect the power? A) Work done and time. B) Work done and velocity. C) Work done and force. D) None of the above. Show Answer Correct Answer: A) Work done and time. 38. A man of weight 900 N walks up a hill of height 10 m. What is the total work done? A) 9000 J. B) 0 J. C) 900 J. D) 90 J. Show Answer Correct Answer: A) 9000 J. 39. Ava, a weight lifter, lifts a mass m at a constant speed to a height h in time t during her workout. What is the average power output of Ava during this exercise? A) Mgh. B) Mh. C) Mgh/t. D) Mg. Show Answer Correct Answer: C) Mgh/t. 40. What is the equation for power and energy? A) E = P/t. B) T = P x E. C) P = W/t. D) P = E/t. Show Answer Correct Answer: D) P = E/t. 41. If the graph of the velocity vs. time of a particle is plotted, the slope will give the particle's A) Kinetic energy. B) Inertia. C) Acceleration. D) Momentum. Show Answer Correct Answer: C) Acceleration. 42. What is the GPE of a 0.3 kg apple on top of a 1 m tree? A) 0.3 J. B) 0 J. C) 2.94 J. D) 2.96 J. Show Answer Correct Answer: C) 2.94 J. 43. A moving 10 kilogram object has 20 Joules of KE. What is its velocity? A) 4 m/s. B) 10 m/s. C) 2 m/s. D) 200 m/s. Show Answer Correct Answer: C) 2 m/s. 44. Lysosome arises from- A) Nucleus. B) Golgi apparatus. C) Ribosome. D) Mitochondria. Show Answer Correct Answer: B) Golgi apparatus. 45. The work done on a body does not depends on A) Angle at which force is inclined to the displacement. B) Displacement. C) Initial velocity. D) Force applied. Show Answer Correct Answer: C) Initial velocity. 46. Which of the following situations is the work done relates to the elastic potential energy of an object to the configuration of the system? A) A vendor using the weighing scale in selling goods. B) A teacher opening the door of the classroom. C) A child riding a bicycle on the street. D) A student walking up a flight of stairs. Show Answer Correct Answer: A) A vendor using the weighing scale in selling goods. 47. A body of mass 1 kg has a kinetic energy of 1 J when its speed is A) 1m/s. B) 1.414m/s. C) 0.45m/s. D) 2m/s. Show Answer Correct Answer: B) 1.414m/s. 48. Which of the following statements show kinetic energy? A) The battery of a lit flashlight. B) A golf ball placed at the edge of the hole. C) A river flowing down a hill. D) None of the above. Show Answer Correct Answer: C) A river flowing down a hill. 49. What happens to the total mechanical energy in a closed system? A) The total mechanical energy remains constant. B) The total mechanical energy decreases continuously. C) The total mechanical energy fluctuates randomly. D) The total mechanical energy increases over time. Show Answer Correct Answer: A) The total mechanical energy remains constant. 50. Work divided by time equals ..... A) Energy. B) Power. C) All the above. D) None of the above. Show Answer Correct Answer: B) Power. 51. A 60-watt light bulb is left on for 2 hours. How much energy does it consume? A) 7200 Watt-hours. B) 7200 Joules. C) 120 Watt-hours. D) 120 Joules. Show Answer Correct Answer: C) 120 Watt-hours. 52. An object of 10kg is raised through a height of 2m. The work done is (g=9.8m/s) A) 196J. B) 19.6J. C) 4.9 J. D) 98J. Show Answer Correct Answer: A) 196J. 53. Which source of energy uses the production of steam to generate electrical energy? A) Nuclear. B) Tides. C) Hydroelectric. D) Waves. Show Answer Correct Answer: A) Nuclear. 54. A 4.00 kg ball is on a 5.00 m ledge. If it is pushed off the ledge, how much kinetic energy will it have just before hitting the ground? A) 50 J. B) 200 J. C) 2000 J. D) 20 J. Show Answer Correct Answer: B) 200 J. 55. Which of the following forms of energy is associated with the motion of atoms and molecules? A) Thermal energy. B) Kinetic energy. C) Gravitational energy. D) Potential energy. Show Answer Correct Answer: A) Thermal energy. 56. In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump. The gravitational potential energy associated with Sotomayor's jump was 1970J. Sotomayor's mass was 82kg. How high did he jump? A) 2.45 m. B) 15.83 km. C) 237.3 m. D) 24 m. Show Answer Correct Answer: A) 2.45 m. 57. Write an expression for the work done in lifting a body of mass 'm' through a vertical height 'h' A) Mgh. B) 1/2 mv$^{2}$. C) 2mgh. D) 1/2 mv$^{2}$-1/2mu$^{2}$. Show Answer Correct Answer: A) Mgh. 58. Is this an example of work? A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 59. A particle is thrown upward with some kinetic energy. What happened to its kinetic energy at the highest point or height it reaches. A) Its kinetic energy is converted to potential energy. B) Its potential energy is converted into Kinetic energy. C) Its velocity becomes negative. D) None of the above. Show Answer Correct Answer: A) Its kinetic energy is converted to potential energy. 60. The amount of work done per unit of time is ..... A) Joule. B) Power. C) Energy. D) None of the above. Show Answer Correct Answer: B) Power. ← 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