This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 4 Work – Quiz 56 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 56 (15 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The kinetic energy of object X is E. Object Y has double the mass and moves with twice the velocity of X. The kinetic energy of Y is ..... A) 4E. B) 8E. C) $\frac{E}{4}$. D) $\frac{E}{8}$. Show Answer Correct Answer: B) 8E. 2. If one object does more work in the same amount of time than another, it has more power. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. Formula of work A) Fs. B) Ma. C) J. D) G. Show Answer Correct Answer: A) Fs. 4. A ball rolling down an incline plane has its maximum potential energy at ..... A) The top. B) A quarter of the way down. C) Half way down. D) The bottom. E) Impossible to predict. Show Answer Correct Answer: A) The top. 5. What does "Efficiency" mean in Physics? A) The speed of an object in motion. B) The amount of force applied to an object. C) Ratio of useful work done to the total energy input. D) The distance an object travels in a given time. Show Answer Correct Answer: C) Ratio of useful work done to the total energy input. 6. A moving 10 kilogram object has 20 Joules of kinetic energy. What is its velocity? A) 2 m/s. B) 4 m/s. C) 200 m/s. D) 10 m/s. Show Answer Correct Answer: A) 2 m/s. 7. The equation for percent efficiency is equal to A) Work input / work output x 100. B) Work output / work input x 100. C) Mass x acceleration. D) Work / time. Show Answer Correct Answer: B) Work output / work input x 100. 8. A 3000 N force moves a car at a constant speed of 10 m/s. What is instantaneous power? A) 300 W. B) 3000 W. C) 30, 000 W. D) 300, 000 W. Show Answer Correct Answer: C) 30, 000 W. 9. What is the work done by the force of 100 N if the displacement of the box is 10 cm and the angle between the force and the box is 60$^\circ$? A) 15 J. B) 10 J. C) 20 J. D) 5J. Show Answer Correct Answer: D) 5J. 10. Which of the following activities has shown that work has been done? A) Pushing a lawn-mower. B) Pushing a room's wall. C) Pressing the top of the dining table. D) Sitting on chair. Show Answer Correct Answer: A) Pushing a lawn-mower. 11. If a runner exerts 350 J of work to make 125 W of power, then how long did it take the runner to do the work? A) 2.4 sec. B) 2.8 sec. C) 8.2 sec. D) 1.1 sec. Show Answer Correct Answer: B) 2.8 sec. 12. A force of 28 N is applied to an object forcing it to move 9 m/s. What is the power? A) 252 W. B) 290 W. C) 150 W. D) 37 W. Show Answer Correct Answer: A) 252 W. 13. Which of the following situations requires more work? A) Bringing a 10 kg cart from rest to a speed of 300m/s. B) Bringing a 300 kg cart from rest to a speed of 10m/s. C) Both scenarios take the same amount of work. D) None of the above. Show Answer Correct Answer: A) Bringing a 10 kg cart from rest to a speed of 300m/s. 14. A machine gun fires 240 bullets per minute with a certain velocity. If the mass of each bullet is 10 gm and the power of the gun is 7.2 kW, the velocity with which each bullet is fired must be A) 300 m/s. B) 600 m/s. C) 1200 m/s. D) 60 m/s. Show Answer Correct Answer: B) 600 m/s. 15. A boy blowing a whistle sends in air at 2 gm/sec with a speed of 150 m/s. His lung power is A) 2.25 W. B) 22.5 W. C) 225 W. D) 0.225W. Show Answer Correct Answer: B) 22.5 W. ← PreviousRelated 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