# 100+ Work Energy And Power (Class 11) MCQs PDF

Work Energy And Power (Class 11) MCQs PDF are must for the aspirants who are preparing for various competitive examination. It covers the concept of Work, Energy and Power which is very important for any competitive exams. This Law of Work, Energy and Power topic is given most importance in various competitive exams like JEE Main, JEE Advanced, NEET, AIIMS etc.

## Work Energy And Power (Class 11) MCQs PDF

These Work Energy And Power (Class 11) MCQs are based on the following topics:

### Work Energy And Power (Class 11) MCQs PDF

a) 0

b) 10

c) 15

d) 20

#### 2. A projectile has both change in kinetic and potential energy. Still the work done calculated between any two points is zero. This is due to _________

a) Presence of no external force

b) No displacement

c) The displacement being in both vertical and horizontal directions

d) Inter-conversion of kinetic and potential energies

#### 3. A body having 7 kg of mass moves slowly and covers a vertical height of 14 m. What is the work done in Joules and what force causes this work? Take g = 10 m/s2.

a) 980, gravity

b) 980, force acting opposite to gravity

c) 1000, gravity

d) 1000, force acting opposite to gravity

#### 4. The total energy of a system moving under the action of a conservative force changes by 50 J. Which of the following statements are correct with regards to the amount of work done?

a) Amount of work done = 50 J

b) Amount of work done < 50 J

c) Amount of work done > 50 J

d) Amount of work done <= 50 J

#### 5. A body of mass 2 Kg, initially at rest, moves under the influence of an external force of magnitude 4 N on plane ground. What is the work done by the force and the change in kinetic energy in the first 10 seconds?

a) 400 J, 400 J

b) -400 J, 400 J

c) 400 J, -400 J

d) -400 J, -400 J

#### 6. 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?

a) 200 J, gravity

b) -200 J, friction

c) 200 J, friction

d) -200 J, gravity

#### 7. According to the work-energy theorem, total change in energy is equal to the _______

a) Total work done

b) Half of the total work done

c) Total work done added with frictional losses

d) Square of the total work done

a) 50 kJ

b) -50 kJ

c) 25 kJ

d) 10 kJ

#### 9. Power is ______

a) Rate of doing work

b) Ability to do work

c) Rate of energy creation

d) Equivalent to work

#### 10. The unit of energy has been named after ______

a) James Prescott Joule

b) John Prescott Joule

c) Jammie Joule

d) Jessy Joule

#### 11. In which category do potential and kinetic energy fall?

a) Mechanical energy

b) Electrical energy

c) magnetic energy

d) Usual energy

a) 10

b) 104

c) 107

d) 109

a) P = dW/dt

b) P = F * d

c) P = E

d) P = dE/dt

a) W = F * ds

b) W = P/t

c) W = E

d) W = E/t

#### 15. Energy involved in creating work _____

a) Gets used up

b) Gets transferred

c) Gets exhausted

d) Gets lost

#### 16. The energy possessed by a body by the virtue of its motion is called ______

a) Kinetic energy

b) Potential energy

c) Total energy

d) Motion energy

#### 17. The energy possessed by a body by the virtue of its position is called ______

a) Kinetic energy

b) Potential energy

c) Total energy

d) Position energy

#### 18. Energy is ________

a) Work

b) The ability to create work

c) Quantification of work

d) Force multiplied by displacement

#### 19. 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 ______

a) It moves extremely slowly

b) It moves with a very high velocity

c) It moves on an equipotential surface

d) It moves with a positive acceleration

#### 20. The total energy change of a body which covers a vertical height is constituted completely by the potential energy change only when ______

a) It moves slowly

b) It moves quickly

c) It moves for some time, then rests, then moves again

d) It moves with a decreasing velocity

#### 21. Work being a scalar quantity sometimes has negative and positive signs. What does the sign suggest?

a) The direction of work

b) Relative directions of force and displacement

c) The direction of force

d) The direction of displacement

a) 16000 J

b) -16000 J

c) 400 J

d) -400 J

a) 10 N

b) -10 N

c) 20 N

d) 70 N

a) 8000 J

b) -8000 J

c) 20000 J

d) 800 J

a) 2000 J

b) -2000 J

c) 20000 J

d) -20000 J

#### 26. A force of 10 N creates a displacement of 2 m but the work done on the body throughout its motion is equal to 70 J. What possibly can be the reason or this?

a) There are multiple forces action on the body

b) The body is at rest

c) The force is not uniform

d) The displacement is harmonic

#### 27. Work done by a force on a body is an example of ______

a) Mechanical work

b) Electrical work

c) Magnetic work

d) Thermodynamic work

#### 28. Work done in a system is ___

a) The measure of energy change

b) The measure of useful work

c) The measure of displacement

d) The measure of force

#### 29. Work is a _______

a) Scalar quantity

b) Vector quantity

c) Foreign quantity

d) Magnitude less quantity

a) 80 J

b) -80 J

c) 40 J

d) 16 J

a) K

b) 3K

c) 4K

d) 9K/4

#### 32. Which of the following is correct?

a) The kinetic energy of a system can be changed without changing the momentum

b) The kinetic energy of a system cannot be changed without changing the momentum

c) The momentum of a system cannot be changed without changing its kinetic energy

d) A system cannot have energy without having momentum

a) 0.45 J

b) 4.5 J

c) 0.9 J

d) 0 J

a) 5 m/s

b) 10 m/s

c) 15 m/s

d) 20 m/s

a) 10m J

b) 100m J

c) 1000m J

d) 10000m J

a) 5600 J

b) 10200 J

c) 11200 J

d) 12000 J

a) 25 %

b) 50%

c) 75%

d) 100%

a) 2:5

b) 4:25

c) 25:4

d) 5:2

a) 200 J

b) 200 kgm2s-1

c) 200 kgm-1s-2

d) 200 kgm-1s-1

a) 0.5J

b) 5J

c) 10J

d) 15J

a) 4000 J

b) 4040 J

c) 4400 J

d) 4800 J

a) 18 J

b) 28 J

c) 38 J

d) 48 J

a) 800 J

b) 1600 J

c) 2000 J

d) 2800 J

a) 20 J

b) 40 J

c) 60 J

d) 80 J

a) True

b) False

a) 40

b) 39

c) 38

d) 69

a) Newtons

b) Joules

c) Ampere

d) Mole

a) True

b) False

a) 116J

b) 114J

c) 118J

d) 120J

a) F = x

b) F = y2

c) F = 2

d) F = 2*t

#### 51. Which of the following is not a conservative force?

a) Gravitational force

b) Spring force

c) Friction force

d) Magnetic force

a) 10.5 J

b) 14.5 J

c) 13.5 J

d) 0.5 J

a) 100 kgs-2

b) 100 kgs-1

c) 100 kg2s2

d) 100 Kgs

a) 250

b) 1000

c) 1250

d) 500

a) 200 J

b) 400 J

c) 2000 J

d) 4000 J

a) True

b) False

a) 3.63 m/s2

b) 4.63 m/s2

c) 9.81 m/s2

d) 10 m/s2

a) True

b) False

#### 59. For a body moving from position Xa to position Xb under a variable force, what is the work done?

a) W = F * (X2 – X1)

b) -W = F * (X2 – X1)

c) W = -F * (X2 – X1)

d) W = F * (X1 – X2)

a) 25 m

b) 50 m

c) 75 m

d) 100 m

a) 5 J

b) 15 J

c) 25 J

d) 50 J

#### 62. Which of the following is true?

a) Potential energy decreases as altitude increases

b) Potential energy increases as altitude increases

c) Potential energy first increases and then decreases as altitude increases

d) Potential energy first decreases and then increases as altitude increases

a) True

b) False

#### 64. Consider 2 balls A and B of the same mass. The potential energy of ball A is thrice that of ball B. How high is ball A compared to ball B?

a) Same height as ball B

b) Twice as high height as ball B

c) Thrice as high height as ball B

d) Four times as high height as ball B

#### 65. The potential energy of an object of constant mass and fixed reference is determined by its _____

a) mass

b) gravitational acceleration

c) position

d) velocity

a) True

b) False

a) 1:1

b) 1:4

c) 1:9

d) 1:3

a) True

b) False

a) 500 J

b) 1000 J

c) 1500 J

d) 2000 J

a) 500 J

b) 1000 J

c) 1500 J

d) 2000 J

a) 6m

b) 12m

c) 20m

d) 144m

a) 2d/F2

b) F2/2k

c) 2k/T2

d) F2/2d

a) 125 J

b) -125 J

c) 62.5 J

d) -62.5 J

#### 74. What is the increase in potential energy storage when the compression distance is doubled in a spring obeying Hooke’s law?

a) No increase

b) 100% increase

c) Cannot be determined

d) 4 times

a) True

b) False

#### 76. The potential energy possessed by a spring is also known as _____

a) Elastic potential energy

b) Extensive potential energy

c) Compressive potential energy

d) Deflection potential energy

a) True

b) False

#### 78. The energy possessed by an object because of its motion is termed _____

a) potential energy

b) kinetic energy

c) nuclear energy

d) solar energy

#### 79. The maximum potential energy in a roller coaster is at _____

a) the top of the steep climb

b) somewhere during the climb

c) somewhere during the descent

d) the lowest point after the climb