This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 4 Work – Quiz 51 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 51 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Suppose you want to calculate how much work it takes to lift a 160 N barbell. Besides the mass of the barbell, what other information do you need to know? A) The shape of the weights. B) How high the barbell is being lifted. C) The strength of the person diong the lifting. D) How quickly the lifts are being done. Show Answer Correct Answer: B) How high the barbell is being lifted. 2. A consumer's kilowatt-hour meter displays 10456 at the start of a billing period and 10966 at the end of the period. How much kW hrs are consumed in that period? A) 21422. B) 10456. C) 510. D) 10966. Show Answer Correct Answer: C) 510. 3. Which of the following statements is true regarding a rider in a roller coaster cart moving with a constant speed through a loop? A) The rider is accelerating. B) The sum of all forces acting on the rider is zero. C) Gravity is the only force doing work on the rider. D) There are two forces acting on the rider, but neither does any work on the rider. Show Answer Correct Answer: A) The rider is accelerating. 4. A car accelerates uniformly from rest. When does the car require the greatest power? A) When the car first accelerates from rest. B) Just as the car reaches its maximum speed. C) The question is misleading because the power required is constant. D) When the car reaches half its maximum speed. Show Answer Correct Answer: B) Just as the car reaches its maximum speed. 5. Both work and energy are measured in A) Joules. B) Newtons. C) Meters. D) Seconds. Show Answer Correct Answer: A) Joules. 6. Which of the following statements is TRUE about work? A) Work is a vector quantity. B) S.I unit for work is kg m$^{2}$ s$^{-1}$. C) Work is defined as cross product between force and displacement of an object. D) No work is done when there is no motion or when the force is perpendicular to motion. Show Answer Correct Answer: D) No work is done when there is no motion or when the force is perpendicular to motion. 7. A 1200 kg roller coaster moves at a velocity of 10 m/s while it is 8 m in the air. What is the total mechanical energy of the roller coaster? A) 96000 J. B) 154080 J. C) 120000 J. D) 196000 J. Show Answer Correct Answer: B) 154080 J. 8. When a body slides against a rough horizontal surface, the work done by friction is A) Positive. B) Zero. C) Negative. D) Constant. Show Answer Correct Answer: C) Negative. 9. Power is a ..... dependent quantity. A) Outlet. B) Energy source. C) Time. D) Volume. Show Answer Correct Answer: C) Time. 10. A 2 kg object is held 5 meters above the ground. What is the gravitational potential energy of the object? A) 5 J. B) 10 J. C) 20 J. D) 100 J. Show Answer Correct Answer: D) 100 J. 11. How far does a car that weighs 5, 000 N move if 18, 000 J of work are done on it? A) 3.8 m. B) 3.7 m. C) 3.2 m. D) 3.6 m. Show Answer Correct Answer: D) 3.6 m. 12. Large man:Fw=1000N, time = 5 secondsSmall child:Fw=400N, time = 1 secondBoth people walked up the same set of steps (1 m). Who developed the most power? A) Large man because he did more work in less time. B) Small child because she did less work in less time. C) Large man because he did less work in more time. D) Small child because she did more work in less time. Show Answer Correct Answer: B) Small child because she did less work in less time. 13. The rate of doing work is called . A) Power. B) Energy. C) Force. D) Displacement. Show Answer Correct Answer: A) Power. 14. Describe a real-life example of the conservation of energy. A) A light bulb converting electrical energy to light. B) A battery storing energy for later use. C) A roller coaster converting potential energy to kinetic energy as it descends. D) A car using fuel to move forward. Show Answer Correct Answer: C) A roller coaster converting potential energy to kinetic energy as it descends. 15. If a pump can raise 1000L of water per minute to a height of 45m, then the horsepower of the pump is A) 9 HP. B) 10 HP. C) 24.3 HP. D) None of these. Show Answer Correct Answer: B) 10 HP. 16. A concrete block is pulled 7.00 m across a frictionless surface by means of a rope as shown in the figure. The tension in the rope is 40.00 N and the net work done on the block is 247.00 J. Wat angle does the rope make with the horizontal? A) 28.10$^\circ$. B) 41.25$^\circ$. C) 47.30$^\circ$. D) 62.50$^\circ$. Show Answer Correct Answer: A) 28.10$^\circ$. 17. A 45N girl sits on a 8N bench that is .5 m tall. How much work is done on the bench? A) 0 J. B) 22.5 J. C) 18.5 J. D) 26.5 J. Show Answer Correct Answer: A) 0 J. 18. An engine lift 10$^{3}$ kg of coal per hour from a mine 360 m deep. Calculate the power of the engine ..... [Take g=10 N/kg] A) 0.1 kW. B) 1 kW. C) 10 kW. D) 100 kW. Show Answer Correct Answer: B) 1 kW. 19. You apply a 25 N force to a crate causing it to displace by 5 meters., it takes 4 seconds to push the crate across the room. What average power was generated? A) 125 W. B) 31.25 W. C) 500 W. D) Not enough information is provided. Show Answer Correct Answer: B) 31.25 W. 20. Define a machine A) Device that makes work easy. B) Device that helps in conversion of energy. C) Device that is operated using electricity. D) None of the above. Show Answer Correct Answer: A) Device that makes work easy. 21. If we doubled the velocity of the of an object without changing its mass then its new K.E will become A) 4 times that of initial K.E. B) 2 times that of initial K.E. C) Half of the initial K.E. D) One-fourth of the initial K.E. Show Answer Correct Answer: A) 4 times that of initial K.E. 22. You are traveling along a freeway at 65 mi/h; your car has kinetic energy. You suddenly skid to a stop because of congested traffic. What happened to the kinetic energy your car just had? A) It is all in internal energy in the road. B) It is all in internal energy in the tires. C) Some of it has transformed to internal energy for the tires and the road, and some of it transferred away by sound energy and thermal energy into the air. D) It was destroyed. Show Answer Correct Answer: C) Some of it has transformed to internal energy for the tires and the road, and some of it transferred away by sound energy and thermal energy into the air. 23. A car of mass 1500 kg has a speed of 20 m/s. It accelerates until its speed is 25 m/s. What is the increase in the kinetic energy of the car? A) 19 kJ. B) 38 kJ. C) 170 kJ. D) 340 kJ. Show Answer Correct Answer: C) 170 kJ. 24. What is the mass of a moving object that has 100 Joules of kinetic energy and moves at a velocity of 2 m/s? A) 50 kg. B) 200 kg. C) 25 kg. D) 100 kg. Show Answer Correct Answer: A) 50 kg. 25. According to the notes, a disadvantage of solar power is: A) The sun is not free. B) The panels are ugly. C) The panels are shiny. D) The panels are expensive. Show Answer Correct Answer: D) The panels are expensive. ← 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