JEE PHYSICS UNIT 4: WORK, ENERGY AND POWER
QUIZ NO 1
TOTAL QUESTIONS = 20


1. A body of mass 3 kg has a velocity of 4 m/s. The kinetic energy of the body is


2. The total mechanical energy of a system remains constant if


3. The work done by a force acting at an angle of 90 degrees to the displacement is


4. A body of mass 10 kg is initially at rest. A force of 50 N acts on it for 2 seconds. The work done on the body is


5. A particle starts from rest and moves with constant acceleration of 2 m/s² for 5 seconds. The work done by the force on the particle is proportional to


6. A bullet of mass 10 g is fired with a velocity of 400 m/s. The kinetic energy of the bullet is


7. The total mechanical energy of a system remains constant if


8. A pendulum is released from a height where its potential energy is 10 J. At the lowest point, its kinetic energy is


9. The work done by friction is always


10. The dot product of force and displacement is zero if


11. A body of mass 4 kg is dropped from a height of 10 m. What is its kinetic energy just before it hits the ground


12. A pendulum is released from a height where its potential energy is 10 J. At the lowest point, its kinetic energy is


13. A spring is stretched by 5 cm. If the force constant of the spring is 100 N/m, the work done in stretching the spring is


14. The potential energy of an object of mass 3 kg at a height of 5 m is


15. A body of mass 2 kg is lifted to a height of 5 m. The work done on the body against gravity is


16. The energy transformation in a pendulum involves


17. The average power of a pump lifting 500 kg water per minute to a height of 20 m is


18. If the velocity of an object is doubled, its kinetic energy becomes


19. Which quantity remains constant in a conservative force field


20. The unit of power in the SI system is



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