This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Work And Energy > Class 9 Science Chapter 11 Work And Energy – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 11 Work And Energy Quiz 2 (53 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A device which converts the electrical energy into mechanical energy is called: A) Electric motor. B) Electromagnet. C) Generator. D) Dynamo. Show Answer Correct Answer: A) Electric motor. 2. Stored energy in the form of position or condition. A) Mechanical energy. B) Momentum. C) Kinetic energy. D) Potential energy. Show Answer Correct Answer: D) Potential energy. 3. A body is moving with velocity 4 m/s, possesses 56 Joules of Kinetic Energy. The momentum of body will be equal to A) 28 kgms$^{-1}$. B) 21 kgms$^{-1}$. C) 7 kgms$^{-1}$. D) 14 kgms$^{-1}$. Show Answer Correct Answer: A) 28 kgms$^{-1}$. 4. In case of negative work the angle between the force and displacement is ..... A) 0$^\circ$. B) 90$^\circ$. C) 180$^\circ$. D) 45$^\circ$. Show Answer Correct Answer: C) 180$^\circ$. 5. In tug of war work done by loosing team is: A) Zero. B) Positive. C) Negative. D) None of these. Show Answer Correct Answer: C) Negative. 6. Why is no machine 100% efficient? A) Some of the input energy is converted to mechanical energy in the environment. B) Some of the input energy is converted to chemical energy in the environment. C) Some of the input energy is converted to heat energy in the environment. D) All machines can be 100% efficient. Show Answer Correct Answer: C) Some of the input energy is converted to heat energy in the environment. 7. Is it possible that a body be in accelerated motion under a force acting on the body, yet no work is being done by the force? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 8. The energy stored in a compressed spring is ..... A) Electrical energy. B) Heat energy. C) Kinetic energy. D) Potential energy. Show Answer Correct Answer: D) Potential energy. 9. Work equals force times A) Matter. B) Weight. C) Distance. D) Power. Show Answer Correct Answer: C) Distance. 10. If the net work done on an object is positive, what can you conclude about the object's motion? A) The object is moving with a constant velocity. B) The object is slowing down. C) The object is at rest; its position is constant. D) The object is speeding up. Show Answer Correct Answer: D) The object is speeding up. 11. The kinetic energy from an object's motion always changes when which factor changes? A) The object's speed. B) The object's direction of motion. C) The object's volume. D) The object's chemical potential energy. Show Answer Correct Answer: A) The object's speed. 12. True or falseYou do work only when you exert a force on an object and move it A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 13. Which one of the following is the unit of energy A) Joule. B) Newton. C) Kilowatt. D) Dyne. Show Answer Correct Answer: A) Joule. 14. Work is zero if the force has a component in the direction opposite of motion. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 15. Energy is the ability to cause what? A) Changes. B) Uncertainty. C) Movement. D) Upheaval. Show Answer Correct Answer: A) Changes. 16. Four toy cars of equal mass are rolling on the floor. Their velocities are listed below. Which has the most potential energy? A) The one moving at 4 m/s backward. B) The one moving at 2 m/s backward. C) The one moving at 3 m/s forward. D) The one moving at 1 m/s forward. E) All the same. Show Answer Correct Answer: E) All the same. 17. If I have a very mean cat that is perched on top of my refrigerator, assuming it has a mass of 2 kg and a height of 2 meters, what is the cat's potential energy? (assume 10 m/s$^{2}$ for grav. acc.) A) 40 Joules. B) 10 Newtons. C) 4 Joules. D) 4 Newtons. Show Answer Correct Answer: A) 40 Joules. 18. A girl applies a horizontal force of 400-N to a box as she slides it across the room. If she moves the box 25-m how much work did she do to the box? A) 0 J. B) 10, 000 J. C) 16 J. D) 400 J. Show Answer Correct Answer: B) 10, 000 J. 19. Energy possessed by a body by virtue of its motion is called: A) Potential energy. B) Kinetic energy. C) Gravitational energy. D) None. Show Answer Correct Answer: B) Kinetic energy. 20. You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required? A) 45 W. B) 41 W. C) 39 W. D) 43 W. Show Answer Correct Answer: C) 39 W. 21. When a coil spring is compressed, the work is done on the spring. the elastic potential energy A) Disappears. B) Remain unchanged. C) Decreases. D) Increases. Show Answer Correct Answer: D) Increases. 22. The work done by a horse against gravity by standing still with his owner (69 kg) is: A) 69 Joules. B) 0 $\frac{kgm^2}{s^2}$. C) 0 $\frac{kgm}{s^2}$. D) I. Show Answer Correct Answer: B) 0 $\frac{kgm^2}{s^2}$. 23. Match the energy change with the appliances. lamps and Flashlights are examples of what type of energy conversion A) Electrical energy to thermal energy. B) Electrical Energy to Radiant Energy. C) Electrical energy to mechanical Energy. D) Electrical Energy to Chemical Energy. Show Answer Correct Answer: B) Electrical Energy to Radiant Energy. 24. Which of the following does a simple machine do? A) Allows the users to apply less force over a longer distance. B) Reduce the amount of force needed to do work. C) Change the direction of the applied force. D) All of the above. Show Answer Correct Answer: D) All of the above. 25. Work done by friction ..... of the body. A) Decreases kinetic energy. B) Decreases potential energy. C) Increases kinetic energy. D) Increases potential energy. Show Answer Correct Answer: A) Decreases kinetic energy. 26. The faster an object moves, the ..... kinetic energy it has. A) More. B) Less. C) None of the above. D) All of the above. Show Answer Correct Answer: A) More. 27. Bob pushes against a wall with a force of 500-N for 20 seconds. Obviously, he cannot move the wall, but he is a bit tired afterwards. How much work did bob do pushing against the wall? A) 10, 000 J. B) 0 J. C) 1000 J. D) 500 J. Show Answer Correct Answer: B) 0 J. 28. Work done upon a body is: A) A vector quantity. B) A scalar quantity. C) Both A and B are correct. D) None of these. Show Answer Correct Answer: B) A scalar quantity. 29. Which of the following is the main source of energy for living things? A) Gasoline. B) Batteries. C) Electricity. D) Food. Show Answer Correct Answer: D) Food. 30. When a ball is dropped from a height, and it falls to the ground, what happens to the kinetic energy? A) It gets converted into light energy. B) It gets converted into sound and heat energy. C) It gets converted into potential energy. D) It gets nullified. Show Answer Correct Answer: B) It gets converted into sound and heat energy. 31. The work done on an object does not depend upon the ..... A) (a) Force applied. B) B)Displacement. C) (c) Initial velocity of the object. D) (d) none. Show Answer Correct Answer: C) (c) Initial velocity of the object. 32. You pick up a 3.8 kg can of paint from the ground and lift it to a height of 1.4 m. You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time (when the can of paint was stationary)? A) 0 J. B) 25 J. C) 52 J. D) 30 J. Show Answer Correct Answer: A) 0 J. 33. Energy from a compressed spring would be an example of ..... A) Elastic. B) Gravitational. C) Chemical. D) Kinetic. Show Answer Correct Answer: A) Elastic. 34. The kinetic energy of an object is K. If its velocity is doubled then its kinetic energy will be: A) K/2. B) I stay. C) HC. D) K. Show Answer Correct Answer: C) HC. 35. If speed of a car becomes 2 times, its kinetic energy becomes A) 16 times. B) 12 times. C) 8 times. D) 4 times. Show Answer Correct Answer: D) 4 times. 36. In which of the following cases, kinetic energy is changing in electric energy? A) Driving a car to cover a distance. B) Paddling the bicycle to cover a distance. C) Rowing a boat in the lake. D) Wind mill to generate electricity. Show Answer Correct Answer: D) Wind mill to generate electricity. 37. What is the unit for Energy? A) Watts. B) Joules. C) Kilograms. D) Newtons. Show Answer Correct Answer: B) Joules. 38. In which scenario is work = 0 J? A) Pushing a stationary wall. B) Pulling a trolley car. C) Pushing a book across the table. D) Dropping a set of keys from a height, h. Show Answer Correct Answer: A) Pushing a stationary wall. 39. Power depends on force and speed. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 40. When a body falls freely towards the earth, then its total energy A) Increases. B) Decreases. C) Remains constant. D) First increases and then decreases. Show Answer Correct Answer: C) Remains constant. 41. 45J of work were done on the object that moved 5M. How much force was applied to the object? A) 8n. B) Snow. C) 0N. D) Sun. Show Answer Correct Answer: D) Sun. 42. The sum of GPE and KE in a system is also called what? A) Net Energy. B) Mechanical Energy. C) 5 Hour Energy. D) Gross Energy. Show Answer Correct Answer: B) Mechanical Energy. 43. A car with mass 'M' is moving on horizontal road with velocity 'v'. Driver applies accelerator and increases it speed 3 times to '3v'. The final K.E. acquired by the car will be: A) 1.5 mv $^{2} $. B) 4.5 Mv$^{2}$. C) 3.5 mv $^{2} $. D) 2.5 mv $^{2} $. Show Answer Correct Answer: B) 4.5 Mv$^{2}$. 44. Which energy transformation is observed in electric cell A) Chemical energy into sound energy. B) Sound energy into mechanical energy. C) Electrical energy into sound energy. D) Chemical energy into electrical energy. Show Answer Correct Answer: D) Chemical energy into electrical energy. 45. What does the Law of Conservation of Energy state? A) Energy will decrease over time. B) Energy cannot be created or destroyed. C) Energy will increase over time. D) Nothing can exchange energy. Show Answer Correct Answer: B) Energy cannot be created or destroyed. 46. Work is measured in units called A) Joules. B) Power. C) Newtons. D) Force. Show Answer Correct Answer: A) Joules. 47. Which one of the following is not the unit of energy? A) Kilowatt hour. B) Kilowatt. C) Newton metre. D) Joule. Show Answer Correct Answer: B) Kilowatt. 48. One atomic mass unit (a.m.u) is equal to: A) 931 eV of energy. B) 1 eV of energy. C) 931 MeV of energy. D) 1 MeV of energy. Show Answer Correct Answer: C) 931 MeV of energy. 49. If you push a cart with a force of 60 N for 2 m ..... how much work have you done A) 120 J. B) 120 N. C) 30 J. D) 30 N. Show Answer Correct Answer: A) 120 J. 50. The potential energy of a ball of weight 7N at 10m of height at rest is:(g = $10ms^{-2}$ A) 700J. B) 0j. C) 70 c. D) 70 n. Show Answer Correct Answer: C) 70 c. 51. If my 500 kg car is rolling down the hill at 10 m/s, how much Kinetic Energy must I overcome in order to stop it? A) 50 Joules. B) 25, 000 Joules. C) 2.5 Joules. D) 5, 000 Joules. Show Answer Correct Answer: B) 25, 000 Joules. 52. An 85.0-kg person climbs stairs, gaining 4.50 meters in height. Find the work done to accomplish this task. A) 18.9 J. B) 0 J. C) 383 J. D) 3825 J. Show Answer Correct Answer: D) 3825 J. 53. What has the greatest impact on Kinetic Energy? A) Height. B) Velocity. C) Gravitational Acceleration. D) Mass. Show Answer Correct Answer: B) Velocity. ← PreviousRelated QuizzesScience QuizzesClass 9 QuizzesClass 9 Science Chapter 11 Work And Energy Quiz 1 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books