This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Physics Part I > Class 11 Physics (Part I) Chapter 4 Work – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The product of the net force on an object and distance through which the object is moved (or f x d) equals A) Energy. B) Acceleration. C) Work. D) Power. Show Answer Correct Answer: C) Work. 2. Which of the following is the best example of work being done. A) Doing homework. B) Lifting a box. C) Holding a box. D) Pushing a stationary box. Show Answer Correct Answer: B) Lifting a box. 3. Energy transferred can be calculated by: A) Multiplying force by distance. B) Dividing force by time. C) Dividing work by force. D) Multiplying power by distance. Show Answer Correct Answer: A) Multiplying force by distance. 4. Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who did more work? A) They did the same amount of work. B) Bobby. C) Carol. D) Not enough information. Show Answer Correct Answer: A) They did the same amount of work. 5. Energy is the ability to do work or cause ..... A) Events. B) Change. C) Explosions. D) Friction. Show Answer Correct Answer: B) Change. 6. ES = 1/2 k $\Delta$x2 The above is the formula for Elastic Energy. What is an example of an elastic energy? A) Holding a weight above the head. B) Speed of sprint runner. C) Stretching spring weights. D) Holding a weight above the head. Show Answer Correct Answer: C) Stretching spring weights. 7. Which of the following devices transforms electrical energy into mechanical energy? A) Ipod. B) An e-reader. C) A manual pencil sharpener. D) A fan. Show Answer Correct Answer: D) A fan. 8. Energy due to an object's position is called ..... energy. A) Chemical. B) Gravitational potential. C) Kinetic. D) Power. Show Answer Correct Answer: B) Gravitational potential. 9. 50 J of work is done lifting a 20.0 N book in the air. How high was it lifted? A) 2.5 m. B) 3.5 m. C) 0.4 m. D) 25 m. Show Answer Correct Answer: A) 2.5 m. 10. A forces applied when the objects involved are in direct contact. A) Contact forces. B) Normal forces. C) Non-contact forces. D) None of the above. Show Answer Correct Answer: A) Contact forces. 11. Which of the following is NOT a measure of power? A) Kilogram meter squared per second squared. B) Kilogram meter per second. C) Joule per second. D) Newtown meter per second. Show Answer Correct Answer: B) Kilogram meter per second. 12. If you perform 1, 000 J of work moving a mattress 5 m, how much does it weigh? A) 20 N. B) 50 J. C) 200 N. D) 6 W. Show Answer Correct Answer: C) 200 N. 13. On a roller coaster, where is maximum potential energy? A) At the top of a big hill. B) When going upside down. C) When going around a corner. D) At the bottom of a big hill. Show Answer Correct Answer: A) At the top of a big hill. 14. A 45 kg stone is moved from a height 20 meters to 2 meters. If this is done in 10 seconds, what is the power needed to accomplish this? A) 1620 watts. B) 810 watts. C) 405 watts. D) 0 watts. Show Answer Correct Answer: B) 810 watts. 15. How do we calculate work? A) W = f * d. B) W = F * d. C) W = f * D. D) W = F * D. Show Answer Correct Answer: B) W = F * d. 16. A spring of force-constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a spring constant of A) $\frac{2}{3}k$. B) $\frac{3}{2}k$. C) 6k. D) 3k. Show Answer Correct Answer: B) $\frac{3}{2}k$. 17. A twig from a tree drops from a 200m high cliff on to a beach below. During its fall, 40% of the twig's energy is converted into thermal energy.What is the speed with which the twig hits the beach? A) 40 ms$^{-1}$. B) 35 ms$^{-1}$. C) 63 ms$^{-1}$. D) 49 ms$^{-1}$. Show Answer Correct Answer: D) 49 ms$^{-1}$. 18. P=25 watts W=5000 Joules t=??? A) 125000 s. B) 200 sec. C) 0.0005 s. D) 125 s. Show Answer Correct Answer: B) 200 sec. 19. What's the symbol for displacement in the Work Formula A) S. B) S. C) D. D) D. Show Answer Correct Answer: A) S. 20. Which of these items is not part of the law of conservation of energy? A) Energy is destroyed by friction. B) Energy cannot be destroyed. C) Energy cannot be created. D) Energy can be transferred between forms. Show Answer Correct Answer: A) Energy is destroyed by friction. 21. Which of the following is a form of energy? A) Time. B) Mass. C) Kinetic energy. D) Distance. Show Answer Correct Answer: C) Kinetic energy. 22. Which of the following is NOT an example of work? A) A boy riding a bicycle on the street. B) A student walking up a flight of stairs. C) The teacher opens the door of the classroom. D) Someone pushing on a wall of a room in a building. Show Answer Correct Answer: D) Someone pushing on a wall of a room in a building. 23. A car's wheel turning while trying to get out of sticky pool of mud where it got stuck. is work done? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 24. An extension of spring is 4cm after hang a load with weight 20N.Calculate elastic potential energy of the spring. A) 0.8 J. B) 0.4 J. C) 40 J. D) 80J. Show Answer Correct Answer: B) 0.4 J. 25. The momentum of a particle is numerically equal to its kinetic energy. what is the velocity of the particle? A) Momentum cannot be equal to the kinetic energy. B) 2 m/s. C) 1 m/s. D) 4 m/s. Show Answer Correct Answer: B) 2 m/s. 26. A student slides a 0.75 kg textbook across a table, and it comes to rest after traveling 1.2 m. Using the work-energy theorem, what is the book's initial speed? (Use g = 9.8 m/s$^{2}$.) A) 2.47 m/s. B) 3.96 m/s. C) 4.85 m/s. D) 2.97 m/s. Show Answer Correct Answer: C) 4.85 m/s. 27. What is the relationship between work and energy? A) Work is energy created. B) Work is energy transferred. C) Work is energy lost. D) Work is energy stored. Show Answer Correct Answer: B) Work is energy transferred. 28. Energy cannot be created or destroyed, only transferred A) Law of conservation of energy. B) Law of conservation of matter. C) Law of energy transfer. D) Law of the universe. Show Answer Correct Answer: A) Law of conservation of energy. 29. As a dropped coin falls toward the ground, ..... energy is converted to ..... energy. A) Potential, heat. B) Potential, kinetic. C) Kinetic, potential. D) Heat, kinetic. Show Answer Correct Answer: B) Potential, kinetic. 30. As the time required for a person to do work increases, his power output A) Increases then decreases. B) Decreases. C) Increases. D) Remains the same. Show Answer Correct Answer: B) Decreases. 31. How can you increase the power output of a machine? A) Reduce the machine size. B) Use lower quality materials. C) Decrease the input energy. D) Enhance efficiency and increase input energy. Show Answer Correct Answer: D) Enhance efficiency and increase input energy. 32. Most renewable energy originates from . A) The Sun. B) The ground. C) Uranium. D) Fossil fuels. Show Answer Correct Answer: A) The Sun. 33. What is the formula for calculating average power? A) Force times velocity. B) Work over distance. C) Mass times acceleration. D) Work over time. Show Answer Correct Answer: D) Work over time. 34. You try to push a heavy trolley along the floor with a force of F=100 N. You push on the box at an angle of &= 45 degrees to the horizontal and it moves 2 m. How much horizontal force is exerted on the boxFx= F x cos & A) 71 J. B) 3195 N. C) 2560 J. D) 71 N. Show Answer Correct Answer: D) 71 N. 35. Calculate the energy loss in a perfectly inelastic collision if the mass of the object is 40kg with velocity 4m/s hits the object of mass 60kg with velocity 2m/s. A) 110J. B) 392J. C) 48J. D) 440J. Show Answer Correct Answer: C) 48J. 36. A ball hits the floor and rebounds after an inelastic collision. In this case A) The momentum of the ball just after the collision is the same as that just before the collision. B) The mechanical energy of the ball remainsthe same in the collision. C) The total momentum of the ball and the earthis conserved. D) The total energy of the ball and the earth is conserved. Show Answer Correct Answer: C) The total momentum of the ball and the earthis conserved. 37. A block of mass m is dropped from the fourth floor of an office building, subsequently hitting the sidewalk at speed v. From what floor should the mass be dropped to double that impact speed? A) The sixteenth floor. B) The tenth floor. C) The twelfth floor. D) The eighth floor. Show Answer Correct Answer: A) The sixteenth floor. 38. You serve a volleyball with a mass of 2100 g. The ball leaves your hand with a velocity of 30 m/s. How much kinetic energy does the volleyball have? A) 945 J. B) 94500 J. C) 189000 J. D) 1890 J. Show Answer Correct Answer: A) 945 J. 39. ..... is done when a force acts on an object and the object moves in the direction of the force. A) Joule. B) Kinetic energy. C) Work. D) Watt. Show Answer Correct Answer: C) Work. 40. Calculate the kinetic energy of a moving 4 kg object travelling at a velocity of 3 m/s. A) 12 J. B) 36 J. C) 18 J. D) 6 J. Show Answer Correct Answer: C) 18 J. 41. How can you increase the power output when riding a bike? A) By stopping frequently. B) By pedaling faster or taking shorter time. C) By taking longer routes. D) By pedaling slower. Show Answer Correct Answer: B) By pedaling faster or taking shorter time. 42. A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done? (pay attention-you have to find work before you find the power) A) 500J. B) 500W. C) 50J. D) 50W. Show Answer Correct Answer: D) 50W. 43. The SI unit for work in ..... A) Calorie. B) Watt. C) Newton. D) Joule. Show Answer Correct Answer: D) Joule. 44. Human heart beats 72 times in 1 minute. If heart consume 1 J of energy per beat then power of heart will be ..... A) 72 W. B) 7.2 W. C) 12 W. D) 1.2 W. Show Answer Correct Answer: D) 1.2 W. 45. Kinetic energy depends on ..... & ..... A) Mass, position. B) Mass, weight. C) Speed, distance. D) Mass, speed. Show Answer Correct Answer: D) Mass, speed. 46. What is the meaning of energy? A) Product of force with displacement. B) Ability to do a work. C) Rate of work done. D) None of the above. Show Answer Correct Answer: B) Ability to do a work. 47. Why does the total amount of mechanical energy stay constant in a system? A) Energy enters. B) Energy leaves. C) Energy is not converted from one form into another. D) Energy is not created or destroyed. Show Answer Correct Answer: D) Energy is not created or destroyed. 48. A block of mass m slides on a horizontal frictionless table with an initial speed v$_{o}$. It then compresses a spring. How much is the spring compressed from its natural length? A) $v_0\\frac{mg}{k}$. B) $v_0\sqrt{\frac{m}{k}}$. C) $\frac{v_0^2}{2g}$. D) $v_0\\frac{m}{k}$. E) $v_0\sqrt{\frac{k}{m}}$. Show Answer Correct Answer: B) $v_0\sqrt{\frac{m}{k}}$. 49. Two bodies of mass m and 4m have equal kinetic energy. What is the ratio of their momentum? A) 1:1. B) 2:1. C) 1:2. D) 1:4. Show Answer Correct Answer: C) 1:2. 50. TRUE OR FALSE:The higher the object is raised above the ground, the more Gravitational Potential Energy it has. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 51. What is the branch of science studying heat, energy, and the ability of that energy to do work? A) Chemistry. B) Thermodynamics. C) Physics. D) Biology. Show Answer Correct Answer: B) Thermodynamics. 52. A 60 kg Ewok is travelling at a constant speed of 7 m/s. What is its kinetic energy in KJ? A) 1470 KJ. B) 1.47 KJ. C) 147 KJ. D) 210 KJ. Show Answer Correct Answer: B) 1.47 KJ. 53. If a force of 10 N moves an object 5 m, what is the work done? A) 10 J. B) 5 J. C) 15 J. D) 50 J. Show Answer Correct Answer: D) 50 J. 54. 1 J is equivalent to A) 1 kg m. B) 1 N m. C) 1 kg s. D) 1 N s. Show Answer Correct Answer: B) 1 N m. 55. If a 10 kg object falls freely from a height of 20 meters, what is its final kinetic energy just before it hits the ground? A) 2000 J. B) 200 J. C) 400 J. D) 100 J. Show Answer Correct Answer: A) 2000 J. 56. What type of energy includes both kinetic and potential energy? A) Mechanical energy. B) Sound energy. C) Heat energy. D) Chemical energy. Show Answer Correct Answer: A) Mechanical energy. 57. When a car is braked to a stop, its kinetic energy is converted into: A) Potential energy. B) Sound energy. C) Electrical energy. D) Thermal energy. Show Answer Correct Answer: D) Thermal energy. 58. A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much power did they exert climbing the stairs? A) 120 W. B) 400 W. C) 1200 W. D) 200 W. Show Answer Correct Answer: D) 200 W. 59. If a light bulb uses 60 watts of power and operates for 2 hours, how much energy does it consume? A) 7200 J. B) 120000 J. C) 432000 J. D) 120 J. Show Answer Correct Answer: C) 432000 J. 60. If a machine has an efficiency of 80% and uses 500 J of energy, how much useful work is done? A) 350 J. B) 300 J. C) 450 J. D) 400 J. Show Answer Correct Answer: D) 400 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 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 8Class 11 Physics (Part I) Chapter 4 Work Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books