MDCAT XI Physics Work Power And Energy Online Test-2

1. A body moving with velocity v acted by force f as shows in diagram,calculate power of body

2. Field in which workdone is independent pf path is called

3. Work is:

4. Workdone is zero if

5. A body moving with uniform velocity on the ground covers 10 m in 2 seconds. The work done by the body is...

6. Power can be measure by calculating

7. In which of the following cases, workdone is not zero

8. Area under force and displacement graph gives

9. Accuracy of workdone by variable force increases with_________

10. A ball attached to a string is rotating around a circle with a radius of 2 m. A force of 5 N is acting on the ball towards centre of circle. How much work is done on the ball?

11. A force OF 20N displacement a body about 3 m,if workdone on body throughout motion is 70J ,What will be the possible reason?

12. workdone against gravitational force is

13. A person weighing 700 N runs up a staircase consisting of 15 steps, each with a height of 0.2 m. How much work is done by the person?

14. if kinetic energy of body is increase by 4 times,momentum will be increased by

15. workdone by gravitational field on body falling downward is

16. work done is independent  of

17. An object thrown upward is moving with velocity v,how The height covered  by object depends on velocity

18. A body of 1 kg is moving with a velocity of 5 m/s. A force of 2 N is applied to the body. After 2 seconds, what is the change in the kinetic energy of the body?

19. Energy can not be produced_______

20.

In a gravitational field, the work done along a closed path is always...?

21. Workdone  by friction is

22. What kind of energy does a flying bird have?

23. Choose the correct statement

24. A body is thrown vertically upward,at  highest point it possesses

25. A body is acted upon by a force $F$. It initially covers 10 m in 2 seconds, and then covers another 10 m in 5 seconds. Choose the correct statement.

26. A truck with a mass of 2000 kg is moving at a speed of 20 m/s. When the brakes are applied, it covers a distance of 10 m from the initial point. How much force is required to stop the truck?

27. Workdone is independent of

28. Ability to do work called

29. If a body of mass 2 kg is initially at rest and starts moving with an acceleration of 2 m/s², what is its momentum after 5 seconds?

30. Workdone on a body can be equal to

31. Which energy is conserved when a body falls under action of gravity?

32. Calculate  workdone is lifting a body of weight of 50N  ,2m above ground

33. Which force always do work

34. A body of mass 10 kg is placed at a position labeled as 1 m above the ground. If the body is moved 5 m higher from that position, how much work is required?

35. Escape velocity does not depends on

36. A ball is moving on the ground with a velocity of 7 m/s. The ball stops after 5 seconds due to a force of 0.5 N. How much power is used?

37. Power is always defined as

38. A box is placed on the ground. If a boy moves this box upward with uniform velocity, then the work done by the boy is converted into what?

39. In which condition workdone is maximum

40. If a force of 25 N is applied to a body and it moves with a velocity of 2 m/s, what power is produced?

41. Power is independent of

42. How much power is required to lift a mass of 20 kg to a height of 30 m above the ground in 2 seconds?

43. Work is:

44. A body of mass 1 kg is moving with a momentum of 5 kg·m/s. A force of 2 N is applied to the body for 2 seconds. What is the final kinetic energy of the body?

45. Rate of change of momentum of a body falling under action of g is equal to:

46. A book with a mass of 0.5 kg is placed on a table whose surface is 5 m above the ground. A student comes and places this book on another table which is 10 m high. By how much does the potential energy of the book increase?

47. Work is said to be done when only