This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 4 Work – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the ratio of output force to the input force applied to a mechanism called? A) Efficiency. B) Mechanical Advantage. C) Joule. D) Watt. Show Answer Correct Answer: B) Mechanical Advantage. 2. How is power defined in terms of work and time? A) Power = work * time. B) Power = work / time. C) Power = time / work. D) Power = force * distance. Show Answer Correct Answer: B) Power = work / time. 3. Unit of work is A) Joule. B) Newton. C) Watt. D) Kg. Show Answer Correct Answer: A) Joule. 4. Kinetic Energy is defined as A) Energy stored due to its location. B) Energy of motion. C) Energy stored in the bonds of molecules. D) Heat energy. Show Answer Correct Answer: B) Energy of motion. 5. Definition of work energy theorem is, the work done by the nett force on a body equals to the ..... A) Change in the body's elestic energy. B) Change in the body's kinetic energy. C) Change in the body's gravitational energy. D) Change in the body's potential energy. Show Answer Correct Answer: B) Change in the body's kinetic energy. 6. Two billiard balls, each moving at 1 m/s, roll toward each other and collide. Suppose after bouncing apart, each moves at 2 m/s. The collision violates the conservation of ..... A) Momentum. B) Kinetic energy. C) Both of these. D) None of these. Show Answer Correct Answer: C) Both of these. 7. A body is lifted against gravity. Which equation shows the work done on the body? A) Work done = change in distance moved by the body. B) Work done = change in energy of the body. C) Work done = change in force on the body. D) Work done = change in power of the body. Show Answer Correct Answer: B) Work done = change in energy of the body. 8. A boy weighing 50kg runs up a staircase of 40 steps, each of 16cm, in 10s. Calculate his power (G= 10m/s) A) 480 W. B) 320 W. C) 120 W. D) 80 W. Show Answer Correct Answer: B) 320 W. 9. The S.I. unit of power is A) Watts (W). B) Volts (V). C) Joules (J). D) Kilowatts(kW). Show Answer Correct Answer: A) Watts (W). 10. A 2 kg object is moving at a speed of 3 m/s. What is its kinetic energy? A) 9 Joules. B) 15 Joules. C) 12 Joules. D) 6 Joules. Show Answer Correct Answer: A) 9 Joules. 11. You lift a 2 kg book off the ground by 3 meters. How much gravitational potential energy is stored in the book? A) 6 J. B) 58.8 J. C) 19.6 J. D) 29.4 J. Show Answer Correct Answer: B) 58.8 J. 12. If a lion drags his prey 10 meters to his den doing 500 joules of work, how much force did he use? A) 50 Newtons. B) 500 Joules. C) 50, 000 Newtons. D) 10 Newtons. Show Answer Correct Answer: A) 50 Newtons. 13. What's the equation for work? A) Work:Distance x mass. B) Work:Force x distance travelled. C) Work:Force x mass. D) Work:Force / distance travelled. Show Answer Correct Answer: B) Work:Force x distance travelled. 14. When a rollercoaster cart moves towards the ground, what happens to the PE that it has? A) It transforms into KE. B) It leaves the system. C) Nothing. D) It stays PE. Show Answer Correct Answer: A) It transforms into KE. 15. What is the value for g (gravity)? A) 99.8 m/s. B) 8.9 m/s. C) 9.8 m/s. D) 9 m/s. Show Answer Correct Answer: C) 9.8 m/s. 16. When do we say that work is done on an object? A) There must be a force acting on the object. B) There must be an energy transferred on the object. C) The force acting is parallel to the object's displacement. D) The force acting is perpendicular to the object's displacement. Show Answer Correct Answer: C) The force acting is parallel to the object's displacement. 17. What is the transfer of energy by thermal interactions called? A) Kinetic energy. B) Work. C) Heat. D) Potential energy. Show Answer Correct Answer: C) Heat. 18. Which of the following possesses elastic energy? A) Heating water. B) Throwing football. C) Winding the mainspring of a clock. D) Bicycle coasting along a level road. Show Answer Correct Answer: C) Winding the mainspring of a clock. 19. Power applied to a particle varies with time as P = (3t2-2t + 1) watt, where t is in second. Find the change in its kinetic energy between t = 2 sec and t = 4 sec. A) 32 J. B) 46 J. C) 61 J. D) 102 J. Show Answer Correct Answer: B) 46 J. 20. A pump delivers water at the rate of 2400 liters in six minutes over a head of 12 m. If g = 10 m/s$^{2}$, its power is A) 200 W. B) 800 W. C) 240 W. D) 24 kW. Show Answer Correct Answer: B) 800 W. 21. In order to INCREASE the potential energy of an object, you need to: A) Put the object lower to the ground. B) Raise the object higher. C) All the above. D) None of the above. Show Answer Correct Answer: B) Raise the object higher. 22. A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ..... energy. A) Only kinetic energy. B) Only potential energy. C) Mostly kinetic energy. D) Both kinetic and potential energy. Show Answer Correct Answer: B) Only potential energy. 23. A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs? A) 400 J. B) 1200 J. C) 200 J. D) 120 J. Show Answer Correct Answer: B) 1200 J. 24. The kinetic energy of a body decreases by 19%. What is the percentage decrease in momentum? A) 20%. B) 15%. C) 10%. D) 5%. Show Answer Correct Answer: C) 10%. 25. What is g on Earth? A) 9.8 m/s/s. B) 9.8 m/s. C) 42 m*s. D) 42 m/s/s. Show Answer Correct Answer: A) 9.8 m/s/s. ← PreviousNext →Related 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 8Class 11 Physics (Part I) Chapter 4 Work Quiz 9Class 11 Physics (Part I) Chapter 4 Work Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books