This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 4 Work – Quiz 39 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 39 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The SI unit for power A) Watts. B) Joules. C) Newtons. D) Meters. Show Answer Correct Answer: A) Watts. 2. A machine rated as 150W, changes the velocity of a 10 kg mass from 4 ms$^{-1}$ to 10 ms$^{-1}$ in 4s. The efficiency of the machine nearly is A) 70%. B) 30%. C) 50%. D) 40%. Show Answer Correct Answer: A) 70%. 3. A ball of mass 500g was moved from A to B. The total work done in moving the Ball from A to B was 5J . If at B the ball moves with a speed of 5.7m/s. What's the speed at which the ball moves initially at A. A) 3.48m/s. B) 5.64m/s. C) 6.89m/s. D) 2.54m/s. Show Answer Correct Answer: A) 3.48m/s. 4. The work done in accelerating an object along horizontal surface is equal to the object's change in ..... A) Kinetic energy. B) Momentum. C) Potential energy. D) Velocity. Show Answer Correct Answer: A) Kinetic energy. 5. E largest land predator is the male polar bear, which typically has a mass of around 500kg. If the maximum kinetic energy for a polar bear with this mass is 60500J, what is its top speed? A) 15.5 m/s. B) 242 m/s. C) 121 m/s. D) 1.55 m/s. Show Answer Correct Answer: A) 15.5 m/s. 6. Define work done in the context of physics. A) Work done is the sum of energy and time taken. B) Work done is the difference between potential and kinetic energy. C) Work done is the product of force and distance in the direction of the force. D) Work done is the total mass multiplied by speed. Show Answer Correct Answer: C) Work done is the product of force and distance in the direction of the force. 7. Kinetic energy increase if velocity increases A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 8. A car moves up a hill at CONSTANT speed. Which ONE of the following represents the work done by the weight of the car as it moves up the hill? A) $\Delta$Ek. B) $\Delta$Ep. C) -$\Delta$Ek. D) -$\Delta$Ep. Show Answer Correct Answer: D) -$\Delta$Ep. 9. A body at rest breaks into two pieces of equal masses. The parts will move A) In same direction. B) Along different lines. C) In opposite directions with equal speeds. D) In opposite directions with unequal speeds. Show Answer Correct Answer: C) In opposite directions with equal speeds. 10. The "power" of a machine measures ..... A) The work it does. B) The force it produces. C) The rate of doing work. D) Its strength. Show Answer Correct Answer: C) The rate of doing work. 11. What is the energy of motion? A) Kinetic. B) Potential. C) Chemical. D) Gravitational. Show Answer Correct Answer: A) Kinetic. 12. A wind powered generator converts wind energy into electrical energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades, into electrical energy. For wind speed v, the electrical power output will be proportional to A) V. B) V$^{3}$. C) V$^{2}$. D) V$^{4}$. Show Answer Correct Answer: B) V$^{3}$. 13. The Atlantic torpedo is a large electric fish capable of generating a voltage of 220V between its tail and its head. This drives a pulse of current of 15A lasting for a time of 2.0 ms. The fish produces 200 pulses per second.What is the average power output of the fish? A) 33W. B) 1.3kW. C) 3.3kW. D) 6.6kW. Show Answer Correct Answer: B) 1.3kW. 14. Name one unit of power bigger than watt. A) Joule. B) Erg. C) Kilowatt. D) Kilowatt-hour. Show Answer Correct Answer: C) Kilowatt. 15. A 5000N block is lifted 10 m. How much work was done? A) 50000 J. B) 5000 J. C) 500 J. D) 50 J. Show Answer Correct Answer: A) 50000 J. 16. All of the following are an example of light energy except for: A) Fire. B) Flashlight. C) Apple. D) Sun. Show Answer Correct Answer: C) Apple. 17. You do 40 Joules of work in 8 seconds. How much power did you exert? A) 0.2 watts. B) 320 watts. C) 5 watts. D) None of the above. Show Answer Correct Answer: C) 5 watts. 18. A bungee jumper jumps from a platform and is decelerated by an elastic bungee cord, as shown.At which part of the jump are all three types of energy non-zero? A) On the platform before the jump. B) On the way down before the cord has started to extend. C) On the way down as he decelerates. D) At the bottom of the jump when the is stationary. Show Answer Correct Answer: C) On the way down as he decelerates. 19. Energy is the capacity to do work. There are different forms of energy. What is the example of Potential Energy? A) Holding a weight above the head. B) Speed of sprint runner. C) Stretching spring weights. D) Holding a weight below the head. Show Answer Correct Answer: A) Holding a weight above the head. 20. A system that does not exchange energy or matter with the environment A) Open system. B) Left system. C) Closed system. D) Right system. Show Answer Correct Answer: C) Closed system. 21. Power is a vector quantity . A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 22. Efficiency is a A) Capacity to do work. B) Energy that it possesses due to its motion. C) Energy held by an object because of its position relative to other objects. D) Comparison of the useful work or energy that a mechanical system produces to the work or energy that was put into the system. Show Answer Correct Answer: D) Comparison of the useful work or energy that a mechanical system produces to the work or energy that was put into the system. 23. S.I unit for energy is A) Joule. B) Watt. C) Newton. D) None of the above. Show Answer Correct Answer: A) Joule. 24. Energy that is stored in a battery is called ..... A) Work energy. B) Radiant. C) Chemical energy. D) Thermal energy. Show Answer Correct Answer: C) Chemical energy. 25. A time-dependent force F = 6t acts on a particle of mass 1 kg. If the particle starts from rest, the work done by the force during the first 1 sec. will be: A) 9 J. B) 18 J. C) 4.5 J. D) 22 J. Show Answer Correct Answer: C) 4.5 J. ← 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