Class 11 Physics: Work, Energy, And Power Mock Test

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Quiz: Work, Energy, and Power – Progressive Test
Total questions: 440
Questions in this round: 50
Time allotted: 70 minutes
Pass score: 60%
Total rounds: 9
Current round: 1^st
Rounds passed: 0 / 9
Weakest rounds: None
Rounds attempted: 0

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Quiz: Work, Energy, and Power – Certificate Challenge
Total questions: 440
Questions to attempt: 100 random
Time allotted: 100 minutes
Certificate pass score: 70%
Random questions: Yes
Certificate: Yes
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Progressive Test — Guest First Round

Work, Energy, and Power – Progressive Test

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1 / 50

1. A smooth ball strikes a fixed smooth wall obliquely with normal component and tangential component . If the coefficient of restitution is , the components just after collision are

a) normal component reversed, tangential component unchanged

b) both components become zero

c) normal component unchanged, tangential component reversed

d) both components reversed with the same magnitude

2 / 50

2. A spring force acts on a block attached to a horizontal spring. The block moves from to . The work done by the spring is positive because

a) the spring force is perpendicular to displacement

b) the displacement is always positive

c) spring force and displacement are both toward

d) the spring constant becomes negative during return

3 / 50

3. Work and energy are treated as scalar quantities in elementary mechanics. This means that their values

a) must always be positive

b) do not require a direction in space

c) are measured only in

d) must always be zero for circular motion

4 / 50

4. For a force acting along the -axis, a negative value of means that

a) the force does net negative work

b) the displacement over the interval is zero

c) the force magnitude is physically impossible

d) the graph has no signed area under it

5 / 50

5. A pump lifts water at a useful output power of . If the pump is efficient, the input power required is

6 / 50

6. A spring with stores of energy. Its displacement from natural length is

7 / 50

7. A vehicle moves with constant speed against a resistive force of . The engine power needed just to balance this resistance is

8 / 50

8. Study the comparison table.

Row	Method	Feature
P	Work-energy theorem	Uses scalar work and kinetic energy
Q	Newton's second law	Uses force and acceleration as vectors
R	Work-energy theorem	Directly gives time without extra information
S	Newton's second law	Can help find acceleration when net force is known

The row that needs correction is

a) Row P

b) Row S

c) Row R

d) Row Q

9 / 50

9. A block slides over a rough horizontal surface and comes to rest. The main reason mechanical energy is not conserved is that

a) gravitational potential energy is always increasing

b) mechanical energy becomes internal energy

c) kinetic energy can never decrease

d) the normal reaction is perpendicular to displacement

10 / 50

10. The elastic potential energy stored in an ideal spring displaced by from its natural length is

11 / 50

11. A block attached to a spring moves from to . The work done by the ideal spring force over this motion is

12 / 50

12. A body has kinetic energy . Its momentum magnitude is

13 / 50

13. Use the graph description below.

A work-time graph consists of two straight segments. From to , work increases from to . From to , work increases from to .

The powers in the two intervals are respectively

a) and

b) and

c) and

d) and

14 / 50

14. A pump lifts of energy in . Its average power is

15 / 50

15. A body is displaced by while two constant forces and act on it. The net work may be written as

16 / 50

16. A device uses of power for . The energy consumed is

17 / 50

17. A block attached to a spring is pulled slowly from the natural position to . The spring constant is . The final spring force magnitude and the external work done are respectively

a) and

b) and

c) and

d) and

18 / 50

18. A small ball is dropped from height onto a fixed horizontal floor. If , the height reached after the first rebound is

19 / 50

19. A machine lifts water with useful output power . If its efficiency is , the rate at which energy is wasted is

20 / 50

20. A car moving on a road is brought to rest by braking. In a simple mechanical description, the brakes and road forces reduce the car's

a) gravitational field strength

b) mass

c) height above the road

d) kinetic energy

21 / 50

21. Two forces act on a box while it moves in a straight line. Force does of work and force does of work. The net work done on the box is

22 / 50

22. A vehicle of mass is moving at . Its engine supplies constant useful power , and resistance is negligible at that instant. The acceleration at that instant is

23 / 50

23. In a one-dimensional elastic collision, a moving body of mass with speed strikes a stationary body of mass . The final velocity of the initially stationary body is

24 / 50

24. A cyclist moves at constant speed along a horizontal circular track. The centripetal force is directed toward the centre at every instant. The work done by the centripetal force over one complete round is

a) equal to force multiplied by circumference

b) negative because the force changes direction

c) zero

d) positive because the cyclist covers distance

25 / 50

25. A body is moved around a closed rough track and returns to its starting point. The work done by kinetic friction over the complete trip is generally

a) equal to the work done by gravity in every case

b) zero because the initial and final positions are the same

c) positive because the body returns to the starting point

d) negative because friction opposes sliding along the path

26 / 50

26. Two carts have equal masses. Cart P moves at and cart Q moves at . They collide and stick together. Their common final velocity is

27 / 50

27. Read the case below and answer the question.

A cart moves on a track from point P to point Q. Its gravitational potential energy decreases by . A rough section of the track removes of mechanical energy. The cart starts from rest at P.

The kinetic energy of the cart at Q is

28 / 50

28. Study the table about power and energy.

Row	Statement	Status
P	is the SI unit of power	true
Q	is a unit of energy	true
R	is the same as	true
S	is the SI unit of power	true

The row that needs correction is

a) Row P

b) Row R

c) Row S

d) Row Q

29 / 50

29. A ball moving with velocity collides elastically with a massive smooth wall and rebounds along the same line. Its velocity just after collision is

30 / 50

30. Assertion: The work done by a force perpendicular to displacement is zero.
Reason: In , .

a) Both Assertion and Reason are true, and Reason explains Assertion

b) Both Assertion and Reason are true, but Reason does not explain Assertion

c) Assertion is true, but Reason is false

d) Assertion is false, but Reason is true

31 / 50

31. Near Earth's surface, if the zero of gravitational potential energy is chosen at , the gravitational potential energy at height is

32 / 50

32. A moving cart compresses a spring on a smooth horizontal track and momentarily comes to rest at maximum compression. The energy change is best described as

a) kinetic energy changing into spring potential energy

b) power changing into force

c) work disappearing because the cart stops

d) spring potential energy changing into gravitational potential energy only

33 / 50

33. A car moves with constant useful engine power on a level road where resistive force is negligible for a short interval. If its speed increases, the acceleration

a) decreases because gives

b) becomes zero immediately

c) increases because power is constant

d) remains constant because force is constant

34 / 50

34. A cart moving at collides with a stationary cart. The carts stick together. The kinetic energy lost in the collision is

35 / 50

35. A stone is lifted vertically upward through a height near Earth's surface. The work done by gravity on the stone is

36 / 50

36. A heavy box is pressed against a wall with a horizontal force, but the box does not move. The mechanical work done by the pressing force on the box is

a) equal to the force multiplied by the time of pressing

b) zero because the displacement of the box is zero

c) negative because the wall opposes the force

d) positive because the force is large

37 / 50

37. A box slides on a smooth horizontal floor. The normal reaction on the box is . The work done by the normal reaction is

38 / 50

38. A force varies with position as , where is in and is in . The work done from to is

39 / 50

39. A body starts from rest under a variable net force. The area under its graph from to is . If the mass is , its speed at is

40 / 50

40. A stone is taken from the ground to a height and then brought back to the ground. Considering only the work done by gravity over the complete trip, the result is

41 / 50

41. The following statements refer to potential energy.
I. It is associated with configuration or position for conservative forces.
II. Its change satisfies .
III. Its zero level may be chosen conveniently.
IV. Only the absolute value of is physically meaningful, never the difference.
The true statements are

a) I, II, and III only

b) II, III, and IV only

c) I, II, III, and IV

d) I and IV only

42 / 50

42. A final review note says, "In collisions and explosions, energy conservation is useless because kinetic energy is not always conserved." The best correction is that

a) kinetic energy is conserved in every explosion

b) momentum is never conserved in these events

c) internal energy can never become kinetic energy

d) total energy is conserved in all forms

43 / 50

43. A spring gun of efficiency stores of elastic potential energy before firing a pellet. The useful kinetic energy given to the pellet is

44 / 50

44. A block slides to the right on a rough horizontal surface while kinetic friction acts to the left. The work done by kinetic friction on the block is

a) positive

b) zero

c) negative

d) equal to the normal reaction

45 / 50

45. A body moves along the -axis under a variable net force. The graph has three equal-width regions.

Region	Signed area	Effect on kinetic energy
P		increase
Q		decrease
R		increase

The total change in kinetic energy is

46 / 50

46. A bead moves from one point to another at the same vertical height along a curved wire. Ignoring friction, the work done by gravity during this motion is

a) equal to multiplied by the wire length

b) zero because the height change is zero

c) positive because the path is curved

d) negative because gravity acts downward

47 / 50

47. A body has kinetic energy . Its speed is

48 / 50

48. A collision is described as isolated and perfectly inelastic. Which pair of statements is correct?

a) Momentum and kinetic energy are both conserved

b) Momentum decreases, while kinetic energy is conserved

c) Momentum and kinetic energy both become zero

d) Momentum is conserved, but kinetic energy decreases

49 / 50

49. A collision table is given below.

Case	Total kinetic energy before	Total kinetic energy after	Energy classification
P			elastic
Q			inelastic with kinetic-energy loss
R			kinetic-energy gain from internal energy
S			perfectly elastic

The row that needs correction is

a) Row Q

b) Row R

c) Row S

d) Row P

50 / 50

50. A conservative force does of work on a body as it moves from point P to point Q. The change in potential energy is

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Work, Energy, and Power Mock Test – Class 11 Physics

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Work, Energy, and Power – Progressive Test

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