This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Physics Part I > Class 11 Physics (Part I) Chapter 4 Work – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What type of energy transformation takes place when you plug in a lamp and turn it on? A) Mechanical to thermal. B) Chemical to radiant. C) Electrical to radiant. D) Electrical to mechanical. Show Answer Correct Answer: C) Electrical to radiant. 2. The law of conservation of energy states that energy A) Can only be converted into heat. B) Cannot be created or destroyed. C) Is created from motion. D) Is always opposite. Show Answer Correct Answer: B) Cannot be created or destroyed. 3. An electric bulb has a power of 100 W. How much energy does it consume in 1 hour? A) 40 kJ. B) 36 kJ. C) 10 kJ. D) 360 kJ. Show Answer Correct Answer: D) 360 kJ. 4. A particle of mass 100g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is A) -1.25 J. B) 0.5 J. C) 1.25 J. D) -0.5 J. Show Answer Correct Answer: A) -1.25 J. 5. If you push very hard on an object but it does not move, has work been done? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 6. Farah has a mass of 47 kg and is moving with initial speed of 5m/s. Find Farah's kinetic energy. A) 2305.35J. B) 1175J. C) 587.5J. D) 235J. Show Answer Correct Answer: C) 587.5J. 7. Two bodies A and B masses m and M(M>>m) have same KE, which body will have more momentum. A) Body A. B) Body B. C) All the above. D) None of the above. Show Answer Correct Answer: B) Body B. 8. A spring with spring constant 200 N/m is compressed by 0.1 m. The potential energy stored in the spring is: A) 0.5 J. B) 1 J. C) 2 J. D) 10 J. Show Answer Correct Answer: A) 0.5 J. 9. Energy transformation for hydropower plant?(HINT:moving water turns turbine that produces electricity.) A) Mechanical $\rightarrow$ electrical. B) Chemical $\rightarrow$ electrical. C) Chemical $\rightarrow$ light $\rightarrow$ thermal. D) Nuclear $\rightarrow$ electrical. Show Answer Correct Answer: A) Mechanical $\rightarrow$ electrical. 10. A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities v1 and v2. The ratio of their Kinetic energies E1 / E2 is A) M1 / m2. B) 1. C) M1v2 / m2v1. D) M2 / m1. Show Answer Correct Answer: D) M2 / m1. 11. What is the unit of power in the SI system? A) Newton. B) Watt. C) Pascal. D) Joule. Show Answer Correct Answer: B) Watt. 12. Work energy theorem states that A) Change in kinetic energy equal to work done. B) Average kinetic energy of molecule is equal to absolute temperature. C) Kinetic energy equal to potential energy. D) None of these. Show Answer Correct Answer: A) Change in kinetic energy equal to work done. 13. This is the capability to do work. A) Power. B) Energy. C) Work. D) Joules. Show Answer Correct Answer: B) Energy. 14. A bicyclist comes to skidding in 10m. During this process, the force on the bicycle due to the road is 200N and is directly opposed to the motion. The work done by the cycle on the road is: A) Zero. B) 2000J. C) 1J. D) -2000J. Show Answer Correct Answer: A) Zero. 15. How does friction affect the conservation of energy? A) Friction has no impact on energy conservation in closed systems. B) Friction reduces the amount of usable energy in a system by converting it to heat, affecting energy conservation. C) Friction increases the total energy in a system by creating more work. D) Friction converts energy into potential energy, increasing efficiency. Show Answer Correct Answer: B) Friction reduces the amount of usable energy in a system by converting it to heat, affecting energy conservation. 16. How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N? A) 180 joules. B) 4000 joules. C) 220 joules. D) 10 joules. Show Answer Correct Answer: B) 4000 joules. 17. The total mechanical energy of an ideal, closed system A) Is constant. B) Decreases over time. C) Is equal to the sum of KE and PE. D) Is constant AND equal to the sum of KE and PE. Show Answer Correct Answer: D) Is constant AND equal to the sum of KE and PE. 18. The energy of movement is ..... ? A) Kinetic. B) Potential. C) All the above. D) None of the above. Show Answer Correct Answer: A) Kinetic. 19. In a block and tackle system the V.R is equal to the number of ..... of the system A) Wheels. B) Strings. C) Revolutions. D) None of the above. Show Answer Correct Answer: B) Strings. 20. Which is NOT a true statement about energy? A) It can cause movement. B) It can change into another form of energy. C) It can cause a temperature change. D) It can be completely used up. Show Answer Correct Answer: D) It can be completely used up. 21. If the K.E. of a body is increased by 300%, its momentum will increase by A) 150%. B) 200%. C) 100%. D) 175%. Show Answer Correct Answer: C) 100%. 22. This is the energy of moving objects using muscles or machines. A) Mechanical. B) Chemical. C) Nuclear. D) Electrical. Show Answer Correct Answer: A) Mechanical. 23. A 0.7 kg coconut falls from a tree. If the gravitational potential energy of the coconut is 18 J, what height is at (in meters)? A) 3.5 m. B) 2.62 m. C) 4 km. D) 1.4 m. Show Answer Correct Answer: B) 2.62 m. 24. What is the significance of the work-energy principle in real-world applications? A) The work-energy principle is essential for predicting and analyzing the effects of forces in various engineering and physical applications. B) It focuses solely on the conservation of energy. C) It explains the relationship between mass and velocity. D) It is only applicable in theoretical physics. Show Answer Correct Answer: A) The work-energy principle is essential for predicting and analyzing the effects of forces in various engineering and physical applications. 25. Energy can't be ..... A) Created nor destroyed. B) Transformed. C) Harnessed or produced. D) Converted. Show Answer Correct Answer: A) Created nor destroyed. 26. In the formula for kinetic energy, what does "m" represent? A) Mass of the object. B) Acceleration due to gravity. C) Spring constant. D) Height of the object. Show Answer Correct Answer: A) Mass of the object. 27. W = 500 Joules t = 25 secondsP =??? A) 2000 W. B) 12500 W. C) 0.05 W. D) 20 W. Show Answer Correct Answer: D) 20 W. 28. What is mechanical work? A) When a force moves an object over a distance. B) When a force is applied but no movement occurs. C) When an object moves without any force. D) When energy is lost in a system. Show Answer Correct Answer: A) When a force moves an object over a distance. 29. A 16 N force is applied to an object and 96 J of work is done. How far was the object moved? A) 1536 m. B) 16 m. C) 80 m. D) 6 m. Show Answer Correct Answer: D) 6 m. 30. What is Power in physics? A) Power is the total energy consumed in a system. B) Power is the amount of force applied over a distance. C) Power is the rate at which work is done or energy is transferred. D) Power is the measure of an object's mass. Show Answer Correct Answer: C) Power is the rate at which work is done or energy is transferred. 31. The power of a crane is 6.25 kW. How much mass of coal it can lift in 1 hour from a mine of 100 m depth? The efficiency of the crane is 80%and g = 10 ms$^{-2}$. A) 180000 kg. B) 1800 kg. C) 18000 kg. D) 180 kg. Show Answer Correct Answer: C) 18000 kg. 32. Power is defined as A) P = t/W, where t is time and W is work. B) P = W/d, where W is work and d is the distance. C) P = W/t, where W is work and t is time. D) None of the above. Show Answer Correct Answer: C) P = W/t, where W is work and t is time. 33. If the speed of a particle is doubled, what happens toits kinetic energy? A) It becomes half. B) It becomes two times larger. C) It is unchanged. D) It becomes four times larger. Show Answer Correct Answer: D) It becomes four times larger. 34. Calculate the kinetic energy of a 2 kg object moving at 3 m/s. A) 15 Joules. B) 9 Joules. C) 6 Joules. D) 12 Joules. Show Answer Correct Answer: B) 9 Joules. 35. When the velocity of a moving object is doubled, the ..... A) Kinetic energy of the object is doubled. B) Potential energy of the object is doubled. C) Net work done by the object is doubled. D) Linear momentum of the object is doubled. Show Answer Correct Answer: D) Linear momentum of the object is doubled. 36. I do 132 Joules of work on a bookcase. If I apply a force of 6 Newtons, how far have I moved the bookcase? A) 792 meters. B) 320 meters. C) 22 meters. D) 17 meters. Show Answer Correct Answer: C) 22 meters. 37. You pull a backpack across the room with a force of 30 N at an angle of 25$^\circ$. How much work is created if you pull the backpack for 12 m? (Round to the nearest whole number) A) 750 J. B) 326 J. C) 300 J. D) 360 J. Show Answer Correct Answer: B) 326 J. 38. Which type of energy is associated with an object's height above the ground? A) Gravitational potential energy. B) Kinetic energy. C) Thermal energy. D) Chemical energy. Show Answer Correct Answer: A) Gravitational potential energy. 39. How can you increase your power when mowing grass? A) Spend more time mowing your grass. B) Mow less of your yard per minute. C) Mow your yard in less time. D) None of the above. Show Answer Correct Answer: C) Mow your yard in less time. 40. A smaller unit of work is called ..... A) Mol. B) Erg. C) Atm. D) MmHg. Show Answer Correct Answer: B) Erg. 41. An object at rest may also have ..... A) Speed. B) Momentum. C) Kinetic Energy. D) Potential Energy. E) Velocity. Show Answer Correct Answer: D) Potential Energy. 42. Brakes are used to slow down a moving car. Into which form of energy is most of the kinetic energy converted as the car slows down? A) Elastic. B) Sound. C) Chemical. D) Thermal. Show Answer Correct Answer: D) Thermal. 43. Which unit is used to measure kinetic energy in the International System of Units (SI)? A) Newtons. B) Watts. C) Joules. D) Volts. Show Answer Correct Answer: C) Joules. 44. Which statement does not illustrate power? A) A farmer plowing the rice field all day. B) A Siberian husky pulling a sled all day. C) A principal sitting on a chair while observing several classes all day. D) A teacher encoding his power point presentation in his laptop all day. Show Answer Correct Answer: C) A principal sitting on a chair while observing several classes all day. 45. If you are in a car that is being pulled down a 56.0 m path with a force of 12.5 Newton's (N), what is the "work" done on the car? A) 7000 J. B) 3500 J. C) 350 J. D) 700 J. E) 70 J. Show Answer Correct Answer: D) 700 J. 46. A lorry of mass 4000kg is travelling at a speed of 4.0m/ s. A car has a mass of 1000kg. The kinetic energy of the car is equal to the kinetic energy of the lorry. What is the speed of the car? A) 16.0 m/s. B) 4.0 m/s. C) 2.0 m/s. D) 8.0 m/s. Show Answer Correct Answer: D) 8.0 m/s. 47. Which of the following objects has the most kinetic energy? A) A 90 kg toddler running at 30 m/s. B) A 20 kg toddler running at 5 m/s. C) A 50 kg toddler running at 30 m/s. D) A 100 kg toddler running at 2 m/s. Show Answer Correct Answer: A) A 90 kg toddler running at 30 m/s. 48. A woman of mass 50 kg has 81 J of kinetic energy. What is her speed? A) 3.2 m/s. B) 1.8 m/s. C) 1.3 m/s. D) 1.6 m/s. Show Answer Correct Answer: B) 1.8 m/s. 49. In the elastic collision of a heavy vehicle moving with the velocity of 10m/s and a small stone at rest, the stone will fly away with a velocity equal to A) 10 m/s. B) 20 m/s. C) 40 m/s. D) 5 m/s. Show Answer Correct Answer: B) 20 m/s. 50. The power of a person is 200 W, then which of statement will be correct ..... A) Person consumes 200 W energy. B) Person can do a work of 20 J in 1 second. C) Person can do a work of 200 J in 1 second. D) Person can do a work of 200 J in 100 seconds. Show Answer Correct Answer: C) Person can do a work of 200 J in 1 second. 51. What does power measure in the context of physics? A) The speed of an object. B) The rate of doing work. C) The distance moved. D) The force applied. Show Answer Correct Answer: B) The rate of doing work. 52. A bicycle chain of length 1.6 m and of mass 1 kg is lying on a horizontal floor. If g = 10ms$^{-2}$, the work done in lifting it with one end touching the floor and the other end 1.6 m above the floor is A) 8 J. B) 3.2 J. C) 16 J. D) 10 J. Show Answer Correct Answer: A) 8 J. 53. ..... is the rate of doing work. A) Conservation of energy. B) Power. C) Joules. D) Energy. Show Answer Correct Answer: B) Power. 54. How do you calculate power? A) P = w / t. B) P = f * t. C) P = w * t. D) None of the above. Show Answer Correct Answer: A) P = w / t. 55. The net work required to stop a moving object is equal to the ..... A) Change in kinetic energy of the object. B) Inertia of the object. C) Change in momentum of the object. D) Change in impulse of the object. Show Answer Correct Answer: A) Change in kinetic energy of the object. 56. How can power be increased? A) By decreasing the work done. B) By decreasing both work and time. C) By increasing the time taken. D) By increasing the work or decreasing the time. Show Answer Correct Answer: D) By increasing the work or decreasing the time. 57. What is the unit of work in the International System of Units (SI)? A) Joule. B) Newton. C) Pascal. D) Watt. Show Answer Correct Answer: A) Joule. 58. What is the power of an agent that does 100 J of work in 5 seconds? A) 50 W. B) 100 W. C) 25 W. D) 20 W. Show Answer Correct Answer: C) 25 W. 59. By increasing the speed at which you do work, you increase your A) Work. B) Energy. C) Power. D) None of the above. Show Answer Correct Answer: C) Power. 60. Lupe lowers a picture that is hanging a wall. Is this an example of positive work, negative work or no work? A) Positive Work. B) Negative Work. C) Can Not be determined. D) No Work. Show Answer Correct Answer: B) Negative Work. 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