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Work Energy and Power Class 11 MCQs. We covered all the Work Energy and Power Class 11 MCQs in this post for free so that you can practice well for the exam.
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Work Energy and Power Class 11 MCQs for Students
A car traveling at high velocity primarily possesses which form of energy?
a) Kinetic energy
b) Potential energy
c) Frictional force
d) Gravitational force
Option a – Kinetic energy
An object weighing 20 kg moves at a steady speed of 5 m/s. What is its kinetic energy?
a) 350 J
b) 150 J
c) 200 J
d) 250 J
Option d – 250 J
Read the following statements:
I. A body in equilibrium has no resultant moment acting on it.
II. Momentum remains conserved in all cases.
III. Kinetic energy is always conserved.
Which of the statements above are accurate?
a) Only I
b) II and III
c) I and II
d) All of the above
Option c – I and II
What form of energy does a hammer raised above the ground contain?
a) Kinetic energy
b) Mechanical energy
c) Muscular energy
d) Potential energy
Option d – Potential energy
On which two factors does the kinetic energy of a moving body depend?
a) Weight and position
b) Mass and position
c) Mass and velocity
d) Mass and acceleration
Option c – Mass and velocity
When positive work is applied to a moving body, how does its kinetic energy change?
a) Decreases
b) Increases
c) Remains constant
d) Becomes zero
Option b – Increases
Assertion: Friction does positive work on a body sliding down an inclined plane. ( Work Energy and Power Class 11 MCQ )
Reason: Work is positive when the angle between force and displacement is acute.
Choose the correct option:
a) Both A and R are true and R explains A correctly
b) Both A and R are true but R is not the correct explanation of A
c) A is true, R is false
d) A is false, R is true
Option d – A is false, R is true
Which of these is considered a conservative force?
a) Friction
b) Gravity
c) Viscous force
d) None of these
Option b – Gravity
Identify the force that is both non-central and non-conservative: ( Work Energy and Power Class 11 MCQ )
a) Frictional force
b) Electric force
c) Gravitational force
d) Mechanical force
Option a – Frictional force
Energy in a body refers to: ( Work Energy and Power Class 11 MCQ )
a) Its ability to perform work
b) A scalar physical quantity
c) The rate of doing work
d) Both a and b
Option d – Both a and b
Which of the following is a non-traditional energy source?
a) Geothermal energy
b) Nuclear energy
c) Wind energy
d) Both a and b
Option d – Both a and b
Which of the following is not typically considered stored energy? ( Work Energy and Power Class 11 MCQ )
a) Nuclear energy
b) Potential energy
c) Electrical energy
d) Chemical energy
Option a – Nuclear energy
Mechanical energy of an object is the combination of: ( Work Energy and Power Class 11 MCQ )
a) Kinetic energy and potential energy
b) Chemical energy and electrical energy
c) Potential energy and heat energy
d) Kinetic energy and heat energy
Option a – Kinetic energy and potential energy
What is the SI unit used to measure mechanical energy?
a) Joule
b) Watt
c) Newton-second
d) Joule-second
Option a – Joule
Work done by a force is defined as: ( Work Energy and Power Class 11 MCQ )
a) The scalar product of force and displacement
b) The scalar product of force and velocity
c) The scalar product of mass and velocity
d) The scalar product of mass and acceleration
Option a – The scalar product of force and displacement
If a man pushes a wall and the wall does not move, what is the work done? ( Work Energy and Power Class 11 MCQ )
a) Negative work
b) Positive but not maximum
c) No work
d) Maximum work
Option c – No work
When a body is rotated in a circular path, the work done on it is:
a) Negative
b) Zero
c) Cannot be determined
d) Positive
Option b – Zero
A body slides on a rough surface. What is the nature of work done by friction? ( Work Energy and Power Class 11 MCQ )
a) Positive
b) Negative
c) Zero
d) Can be either positive or negative
Option b – Negative
When an object freely falls under gravity, the work done by gravity is: ( Work Energy and Power Class 11 MCQ )
a) Positive
b) Negative
c) Zero
d) Infinite
Option a – Positive
A 40 kg boy and a 50 kg man climb stairs. The boy takes 20 seconds, and the man takes 40 seconds. What is the ratio of their power output?
a) 8:5
b) 4:3
c) 9:11
d) 6:12
Option a – 8:5
A body of 2 kg has potential energy given by U = 6x + 8y (in joules), where x and y are positions in meters. If the object starts at rest at (4 m, 3 m), at what time will it reach the y-axis? ( Work Energy and Power Class 11 MCQ )
a) 1.63 s
b) 1.2 s
c) 1.13 s
d) 2.4 s
Option a – 1.63 s
A body of mass 1 kg falls from a height of 20 m to 10 m. What will be its kinetic energy at 2 m height? (Take g = 10 m/s²)
a) 1200 J
b) 2000 J
c) 1400 J
d) 1800 J
Option d – 1800 J
A 20 kg block is moving at 5 m/s along the x-direction. A resistive force F = 0.2x J/m acts on it between x = 10 m and x = 30 m. What is its kinetic energy? ( Work Energy and Power Class 11 MCQ )
a) 120 J
b) 150 J
c) 170 J
d) 280 J
Option c – 170 J
Two perpendicular forces of 5 N and 8 N act simultaneously on a 15 kg object initially at rest. After 15 seconds, what is the kinetic energy of the object?
a) 423.2 J
b) 555.4 J
c) 667.5 J
d) 721.4 J
Option c – 667.5 J
A 0.5 hp motor operates at 500 RPM and is 60% efficient. How much work is done in one rotation?
a) 12.64 J
b) 26.87 J
c) 13.26 J
d) 46.48 J
Option b – 26.87 J
What is the expression for instantaneous power delivered to a 20 kg object accelerating uniformly from rest to 20 m/s in 10 seconds?
a) 100 t
b) 80 t
c) 20 t
d) 40 t
Option b – 80 t
A 1000 kg car is moving at 40 m/s. If the engine supplies 50 kW of power and the surface provides 600 N of resistance, what is the car’s maximum acceleration? ( Work Energy and Power Class 11 MCQ )
a) 0.65 m/s²
b) 0.5 m/s²
c) 1.2 m/s²
d) 2.6 m/s²
Option a – 0.65 m/s²
If a 2 kg object strikes a spring with a speed of 2 m/s, what will be the maximum compression of the spring? (Spring constant k = 50 N/m)
a) 0.1 m
b) 0.8 m
c) 0.4 m
d) 0.2 m
Option c – 0.4 m
Two individuals perform the same amount of work. If the first completes it in 20 seconds and the second in 25 seconds, what is the ratio of their power output? ( Work Energy and Power Class 11 MCQ )
a) 2 : 3
b) 5 : 4
c) 3 : 2
d) 4 : 5
Option b – 5 : 4
A particle experiences a force that is always perpendicular to its velocity and moves in a plane. What can be concluded? ( Work Energy and Power Class 11 MCQ )
a) Velocity remains constant
b) Acceleration remains constant
c) Kinetic energy remains constant
d) It moves in a straight line
Option c – Kinetic energy remains constant
Water falls on a turbine at a rate of 200 kg/s from a height of 50 m. What is the power delivered to the turbine? (g = 10 m/s²)
a) 400 kW
b) 100 kW
c) 50 kW
d) 200 kW
Option b – 100 kW
A 100 kW towing van pulls a bus on a flat road at a steady speed of 10 m/s. What is the force exerted by the van? ( Work Energy and Power Class 11 MCQ )
a) 15 kN
b) 30 kN
c) 10 kN
d) 20 kN
Option c – 10 kN
What is the average power developed by an engine in a 600 kg car that accelerates uniformly from rest to 108 km/h in 10 seconds?
a) 20 kW
b) 47 kW
c) 27 kW
d) 32 kW
Option c – 27 kW
The kinetic energy of an object is directly related to: ( Work Energy and Power Class 11 MCQ )
a) The work needed to bring it to rest
b) Its velocity
c) Its potential energy
d) Its acceleration
Option a – The work needed to bring it to rest
If a shell from a cannon explodes mid-air, what happens?
a) Total momentum increases
b) Total momentum decreases
c) Total energy decreases
d) Total kinetic energy increases
Option d – Total kinetic energy increases
A 10 kg object has a momentum of 10 kg·m/s. If a 3 N force is applied for 10 seconds, what is the increase in kinetic energy? ( Work Energy and Power Class 11 MCQ )
a) 30 J
b) 80 J
c) 20 J
d) 75 J
Option d – 75 J
A nucleus splits into two parts whose radii are in the ratio 1:4. What is the ratio of their velocities?
a) 4 : 1
b) 8 : 1
c) 64 : 1
d) 32 : 1
Option c – 64 : 1
A motorboat experiences a 300 N water resistance. How much power is required for it to travel at 4 m/s?
a) 0.5 kW
b) 1.2 kW
c) 1.8 kW
d) 1.5 kW
Option b – 1.2 kW
A 6 kg bomb explodes into two parts in the mass ratio of 1:4. If the smaller fragment has 200 J of kinetic energy, what is the momentum of the larger fragment? ( Work Energy and Power Class 11 MCQ )
a) 22 kg·m/s
b) 33 kg·m/s
c) 44 kg·m/s
d) 11 kg·m/s
Option a – 22 kg·m/s
Two objects have equal linear momentum but their kinetic energies are in a 5:1 ratio. What is the ratio of their masses?
a) 5 : 1
b) 10 : 1
c) 1 : 10
d) 1 : 5
Option d – 1 : 5
A 3 m long ladder weighs 200 N and has a 50 N mass at its top. Its center of gravity is 1 m from the base. How much work is needed to raise it vertically?
a) 450 J
b) 150 J
c) 250 J
d) 350 J
Option d – 350 J
A spring stores 50 J of energy when stretched by 2 cm. How much more energy is stored when it’s stretched an additional 2 cm?
a) 150 J
b) 90 J
c) 180 J
d) 300 J
Option a – 150 J
A 2 kg block is pulled with a force of 20 N over a floor where the friction coefficient is 0.3. What is the work done in 5 seconds? (g = 10 m/s²) ( Work Energy and Power Class 11 MCQ )
a) 900 J
b) 1750 J
c) 1240 J
d) 2341 J
Option b – 1750 J
Two solid spheres of 4 kg and 3 kg move toward each other at 0.4 m/s and x m/s respectively. If they stop after colliding, find x.
a) -0.28 m/s
b) -0.64 m/s
c) -0.15 m/s
d) -0.53 m/s
Option d – -0.53 m/s
A person walks on a flat road while carrying a 10 kg rock on their head. How much work is done against gravity?
a) Zero
b) 40 J
c) 10 J
d) 20 J
Option a – Zero
A particle is acted on by a force F = (0.2x + 10) N and moves from x = 0 to x = 5 m. How much work is done? ( Work Energy and Power Class 11 MCQ )
a) 23.45 J
b) 62.3 J
c) 46.4 J
d) 52.5 J
Option d – 52.5 J
A force of 6 N maintains a velocity of 4 m/s in an 8 kg block for one minute. What is the work done?
a) 1440 J
b) 1860 J
c) 1960 J
d) 1206 J
Option a – 1440 J
Two masses, 1 kg and 2 kg, move at 4 m/s and 0 m/s before collision. What is their combined velocity after collision? ( Work Energy and Power Class 11 MCQ )
a) 4.96 m/s
b) 2.33 m/s
c) 6.48 m/s
d) 1.33 m/s
Option d – 1.33 m/s
A packet lies on a horizontal surface inclined at 30°. If 20 J of work displaces it by 5 m, what force was applied?
a) 4.61 N
b) 5.28 N
c) 3.64 N
d) 6.23 N
Option a – 4.61 N
What is the ratio of relative velocity after and before a collision between two objects called? ( Work Energy and Power Class 11 MCQ )
a) Collision velocity
b) Velocity sum
c) Resultant velocity
d) Coefficient of restitution
Option d – Coefficient of restitution
We covered all the work energy and power class 11 mcqs above in this post for free so that you can practice well for the exam.
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