This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 4 Work – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the relationship between work and energy? A) Work is energy transferred. B) Work is energy stored. C) Work is energy created. D) Work is energy lost. Show Answer Correct Answer: A) Work is energy transferred. 2. Energy cannot be created or destroyed, only transferred A) Law of conservation of matter. B) Law of conservation of energy. C) Law of energy transfer. D) Law of the universe. Show Answer Correct Answer: B) Law of conservation of energy. 3. As a dropped coin falls toward the ground, ..... energy is converted to ..... energy. A) Heat, kinetic. B) Potential, heat. C) Kinetic, potential. D) Potential, kinetic. Show Answer Correct Answer: D) Potential, kinetic. 4. As the time required for a person to do work increases, his power output A) Decreases. B) Increases. C) Increases then decreases. D) Remains the same. Show Answer Correct Answer: A) Decreases. 5. 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. 6. Most renewable energy originates from . A) Fossil fuels. B) The ground. C) The Sun. D) Uranium. Show Answer Correct Answer: C) The Sun. 7. What is the formula for calculating average power? A) Work over distance. B) Work over time. C) Force times velocity. D) Mass times acceleration. Show Answer Correct Answer: B) Work over time. 8. 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 N. B) 71 J. C) 3195 N. D) 2560 J. Show Answer Correct Answer: A) 71 N. 9. 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) 440J. B) 110J. C) 392J. D) 48J. Show Answer Correct Answer: D) 48J. 10. 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. 11. 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 eighth floor. B) The tenth floor. C) The twelfth floor. D) The sixteenth floor. Show Answer Correct Answer: D) The sixteenth floor. 12. 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) 1890 J. C) 94500 J. D) 189000 J. Show Answer Correct Answer: A) 945 J. 13. ..... is done when a force acts on an object and the object moves in the direction of the force. A) Work. B) Kinetic energy. C) Watt. D) Joule. Show Answer Correct Answer: A) Work. 14. Calculate the kinetic energy of a moving 4 kg object travelling at a velocity of 3 m/s. A) 18 J. B) 36 J. C) 12 J. D) 6 J. Show Answer Correct Answer: A) 18 J. 15. How can you increase the power output when riding a bike? A) By pedaling faster or taking shorter time. B) By taking longer routes. C) By pedaling slower. D) By stopping frequently. Show Answer Correct Answer: A) By pedaling faster or taking shorter time. 16. 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) 50J. B) 50W. C) 500J. D) 500W. Show Answer Correct Answer: B) 50W. 17. The SI unit for work in ..... A) Joule. B) Watt. C) Newton. D) Calorie. Show Answer Correct Answer: A) Joule. 18. 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) 12 W. C) 1.2 W. D) 7.2 W. Show Answer Correct Answer: C) 1.2 W. 19. Kinetic energy depends on ..... & ..... A) Mass, speed. B) Mass, position. C) Mass, weight. D) Speed, distance. Show Answer Correct Answer: A) Mass, speed. 20. 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. 21. Why does the total amount of mechanical energy stay constant in a system? A) Energy is not created or destroyed. B) Energy leaves. C) Energy enters. D) Energy is not converted from one form into another. Show Answer Correct Answer: A) Energy is not created or destroyed. 22. 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) $\frac{v_0^2}{2g}$. B) $v_0\\frac{mg}{k}$. C) $v_0\\frac{m}{k}$. D) $v_0\sqrt{\frac{m}{k}}$. E) $v_0\sqrt{\frac{k}{m}}$. Show Answer Correct Answer: D) $v_0\sqrt{\frac{m}{k}}$. 23. Two bodies of mass m and 4m have equal kinetic energy. What is the ratio of their momentum? A) 1:4. B) 1:2. C) 1:1. D) 2:1. Show Answer Correct Answer: B) 1:2. 24. 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. 25. 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. ← 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 8Class 11 Physics (Part I) Chapter 4 Work Quiz 9Class 11 Physics (Part I) Chapter 4 Work Quiz 10Class 11 Physics (Part I) Chapter 4 Work Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books