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Class 11 Physics: Work, Energy and Power
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MCQs on work, energy and power basics, work energy theorem, kinetic energy, friction, potential energy, variable force, spring potential energy, energy conservation law, power, collision and mechanical energy conservations.

Class 11 Physics: Work, Energy and Power
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25 Questions

1. A bucket filled with water weighing 20 kg is raised from a well of depth 20 m. If the linear density of the rope is 0.2 kg/m, the work done is _____ (Assume g = 10m/s2)
2. A force F = (5i – 3j +2k) N moves a particle from r1 = (2i + 7j + 4k) m to r2 = (5i + 2j + 8k) m. What is the work done by the force?
3. For the graph shown in the figure, what is the difference between x-coordinate of A and B called?
4. A motor is used to pump water from a depth of 5 m to fill a volume of 10 cubic meters in 5 minutes. If 50% of the power is wasted, what is the power of the motor? (Assume g = 10m/s2)
5. A body of mass 3 kg starts from rest with a uniform acceleration of unknown magnitude. If the body has a velocity of 30 m/s in 6 seconds, what is the power consumed in 3 seconds?
6. The kinetic energy of a body is 'K'. If one-fourth of its mass is removed and velocity is doubled, the new kinetic energy will be _____
7. What are the types of kinetic friction?
8. The work done by a body while covering a vertical height of 5m is 50 kJ. By how much amount has the energy of the body changed?
9. Energy involved in creating work _____
10. Work done in a system is ___
11. A body moving with a constant velocity on normal ground initially has an energy of 1000 J. If the final energy is 800 J, what is the work done and which force causes this work?
12. The change in the total energy of a body moving because of work being done on it is attributed by the change in kinetic energy only when ______
13. The unit of energy has been named after ______
14. Which of the following statements are true?
15. Two identical balls of mass 'm' are released from rest from a height 'h' on two ramps of different inclinations as shown in the figure. Which of the following is true for this scenario? Assume all surfaces to be smooth.

16. A machine gun fires 360 bullets per minute. Each bullet has a mass of 5 grams and travels at 600 m/s. What is the power of the gun? (Assume no loss of energy and 100% power transmission)
17. Which of the following is correct?
18. In which category do potential and kinetic energy fall?
19. Two bodies collide perfectly inelastically, they will ______
20. The potential energy of an object of constant mass and fixed reference is determined by its _____
21. A ball of mass 100 g is moving with a velocity of 3 m/s towards east. A cube of mass 200 gram is moving towards west with a velocity of 7 m/s. If the collision is perfectly elastic, what is the final velocity of the ball in m/s?
22. For a body of mass 'm' on a rough inclined plane with a constant but arbitrary coefficient of friction as shown in the figure, what is the acceleration on the inclined plane if the net downward force is donated as 'F'. Let 'g' be the acceleration due to gravity and 'u' be the coefficient of friction.

23. A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s2)
24. Consider a block of mass 9.81kg on an inclined surface of the coefficient of friction 0.15 and angle of inclination 30 degrees. What will be its acceleration on the inclined plane if acceleration due to gravity is 9.81 m/s2?
25. Which of the following is true?

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