WBJEE PYQs for Work, Energy and Power with Solutions: Practice WBJEE Previous Year Questions

Updated on - Dec 30, 2025

Work, Energy and Power is an important topic in the Physics section in WBJEE exam. Practising this topic will increase your score overall and make your conceptual grip on WBJEE exam stronger.

This article gives you a full set of WBJEE PYQs for Work, Energy and Power with explanations for effective preparation. Practice of WBJEE Physics PYQs including Work, Energy and Power questions regularly will improve accuracy, speed, and confidence in the WBJEE 2026 exam.

WBJEE PYQs for Work, Energy and Power with Solutions

1.
In a triangle $ABC$, the sides $AB$ and $AC$ are represented by the vectors $3 \hat{i} + \hat{j} + \hat{k}$ and $\hat{i} + 2 \hat{j} + \hat{k}$ respectively. Calculate the angle $\angle ABC$
- $\cos^{-1} \sqrt{\frac{5}{11}}$
- $\cos^{-1} \sqrt{\frac{6}{11}}$
- $\left( 90^{\circ} - \cos^{-1} \sqrt{\frac{5}{11}} \right)$
- $\left( 180^{\circ} - \cos^{-1} \sqrt{\frac{5}{11}} \right)$
View Solution
2.
Two disks of equal mass but different diameter are connected with an axle system that allows them to roll down an inclined plane together. Both disks start and finish at the same time. Which of the following statements best describes the disks?
- (A) Their tangential velocity is the same.
- (B) Their tangential acceleration is the same.
- (C) Their angular velocity is the same.
- (D) Their angular displacement is the same.
View Solution
3.
There are n elastic balls placed on a smooth horizontal plane. The masses of the balls are m,$\frac{m}{2}$,$\frac{m}{2^2}$........$\frac{m}{2^{n-1}}$ respectively. If the first ball hits the second ball with velocity V₀, then the velocity of the n^th ball will be,
- $\frac{4}{3}V_0$
- $(\frac{4}{3})^{n}V_0$
- $(\frac{4}{3})^{n-1}V_0$
- V₀
View Solution
4.
The value of F so as to keep the smooth wedge stationary, when it is loaded with a block of mass M, which is connected with a light inextensible string, will be
- (A) Mg sin 2θ
- (B) Mg/2 sin 2θ
- (C) Mg sin θ
- (D) Mg cos θ
View Solution
5.
At a given place where acceleration due to gravity is ' $8^{'} m / s^{2},$ a sphere of lead of density 'd' $kg / m^{3}$ is gently released in a column of liquid of density $ρ kg / m^{3}$ . If $d > ρ$ , the sphere will
- (A) fall vertically with an acceleration 'g'
- (B) fall vertically with no acceleration
- (C) fall vertically with an acceleration $g (\frac{d - ρ}{d})$
- (D) fall vertically with an acceleration $g (\frac{ρ}{d})$
View Solution
6.
A body is projected horizontally with a velocity of $u$ $ m/s$ at an angle $ \beta $ with the horizontal. The kinetic energy at the highest point is $( \frac{ 3}{ 4} )^{th}$ of the initial kinetic energy. The value of $ \beta $ is
- $ 30^\circ $
- $ 45^\circ $
- $ 60^\circ $
- $ 120^\circ $
View Solution
7.
The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?
- (A) The room will be warmed up gradually.
- (B) The temperature of the room will remain unaffected.
- (C) The room will become as cold as the refrigerator.
- (D) The room will be cooled slightly.
View Solution
8.
Two mirrors at an angle θº produce 5 images of a point. The number of images produced when θ is decreased to θº – 30º is
- (A) 9
- (B) 10
- (C) 11
- (D) 12
View Solution
9.
A bullet of mass $m$ travelling with a speed $v$ hits a block of mass $M$ initially at rest and gets embedded in it. The combined system is free to move and there is no other force acting on the system. The heat generated in the process will be
- $Zero$
- $\frac{mv^{2}}{2}$
- $\frac{Mmv^{2}}{2\left(M-m\right)}$
- $\frac{mMv^{2}}{2\left(M+m\right)}$
View Solution
10.
A block of mass $m (= 0.1 kg)$ is hanging over a frictionless light fixed pulley by an inextensible string of negligible mass. The other end of the string is pulled by a constant force $F$ in the verticaly downward direction. The linear momentum of the block increase by $2\,kg$ $ms^{-1}$ in $1\,s$ after the block starts from rest. Then, (given $g \,= \,10\,ms^{-2}$)
- The tension in the string is F
- The tension in the string is 3N
- The work done by the tension on the block is 20 J during this 1 s
- The work done against the force of gravity is 10 J
View Solution
11.
A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement S is given as a function of time (t) as
- S = at + bt$^2$, a, b are constants
- S = bt$^2$, b is a constant
- s=a t3/2,a is a constant
- S = at, a is a constant
View Solution

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WBJEE PYQs for Work, Energy and Power with Solutions: Practice WBJEE Previous Year Questions

WBJEE PYQs for Work, Energy and Power with Solutions

1.
In a triangle $ABC$, the sides $AB$ and $AC$ are represented by the vectors $3 \hat{i} + \hat{j} + \hat{k}$ and $\hat{i} + 2 \hat{j} + \hat{k}$ respectively. Calculate the angle $\angle ABC$

2.
Two disks of equal mass but different diameter are connected with an axle system that allows them to roll down an inclined plane together. Both disks start and finish at the same time. Which of the following statements best describes the disks?

3.
There are n elastic balls placed on a smooth horizontal plane. The masses of the balls are m,\(\frac{m}{2}\),\(\frac{m}{2^2}\)........\(\frac{m}{2^{n-1}}\) respectively. If the first ball hits the second ball with velocity V₀, then the velocity of the n^th ball will be,

4.
The value of F so as to keep the smooth wedge stationary, when it is loaded with a block of mass M, which is connected with a light inextensible string, will be

5.
At a given place where acceleration due to gravity is ' $8^{'} m / s^{2},$ a sphere of lead of density 'd' $kg / m^{3}$ is gently released in a column of liquid of density $ρ kg / m^{3}$ . If $d > ρ$ , the sphere will

6.
A body is projected horizontally with a velocity of $u$ $ m/s$ at an angle $ \beta $ with the horizontal. The kinetic energy at the highest point is $( \frac{ 3}{ 4} )^{th}$ of the initial kinetic energy. The value of $ \beta $ is

7.
The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

8.
Two mirrors at an angle θº produce 5 images of a point. The number of images produced when θ is decreased to θº – 30º is

9.
A bullet of mass $m$ travelling with a speed $v$ hits a block of mass $M$ initially at rest and gets embedded in it. The combined system is free to move and there is no other force acting on the system. The heat generated in the process will be

11.
A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement S is given as a function of time (t) as

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WBJEE PYQs for Work, Energy and Power with Solutions

1.In a triangle $ABC$, the sides $AB$ and $AC$ are represented by the vectors $3 \hat{i} + \hat{j} + \hat{k}$ and $\hat{i} + 2 \hat{j} + \hat{k}$ respectively. Calculate the angle $\angle ABC$

2.Two disks of equal mass but different diameter are connected with an axle system that allows them to roll down an inclined plane together. Both disks start and finish at the same time. Which of the following statements best describes the disks?

3.There are n elastic balls placed on a smooth horizontal plane. The masses of the balls are m,\(\frac{m}{2}\),\(\frac{m}{2^2}\)........\(\frac{m}{2^{n-1}}\) respectively. If the first ball hits the second ball with velocity V0, then the velocity of the nth ball will be,

4.The value of F so as to keep the smooth wedge stationary, when it is loaded with a block of mass M, which is connected with a light inextensible string, will be

5.At a given place where acceleration due to gravity is ' 8′m/s2, a sphere of lead of density 'd' kg/m3 is gently released in a column of liquid of density ρkg/m3. If d>ρ, the sphere will

6.A body is projected horizontally with a velocity of $u$ $ m/s$ at an angle $ \beta $ with the horizontal. The kinetic energy at the highest point is $( \frac{ 3}{ 4} )^{th}$ of the initial kinetic energy. The value of $ \beta $ is

7.The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

8.Two mirrors at an angle θº produce 5 images of a point. The number of images produced when θ is decreased to θº – 30º is

9.A bullet of mass $m$ travelling with a speed $v$ hits a block of mass $M$ initially at rest and gets embedded in it. The combined system is free to move and there is no other force acting on the system. The heat generated in the process will be

11.A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement S is given as a function of time (t) as

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1.
In a triangle $ABC$, the sides $AB$ and $AC$ are represented by the vectors $3 \hat{i} + \hat{j} + \hat{k}$ and $\hat{i} + 2 \hat{j} + \hat{k}$ respectively. Calculate the angle $\angle ABC$

2.
Two disks of equal mass but different diameter are connected with an axle system that allows them to roll down an inclined plane together. Both disks start and finish at the same time. Which of the following statements best describes the disks?

3.
There are n elastic balls placed on a smooth horizontal plane. The masses of the balls are m,\(\frac{m}{2}\),\(\frac{m}{2^2}\)........\(\frac{m}{2^{n-1}}\) respectively. If the first ball hits the second ball with velocity V₀, then the velocity of the n^th ball will be,

4.
The value of F so as to keep the smooth wedge stationary, when it is loaded with a block of mass M, which is connected with a light inextensible string, will be

5.
At a given place where acceleration due to gravity is ' $8^{'} m / s^{2},$ a sphere of lead of density 'd' $kg / m^{3}$ is gently released in a column of liquid of density $ρ kg / m^{3}$ . If $d > ρ$ , the sphere will

6.
A body is projected horizontally with a velocity of $u$ $ m/s$ at an angle $ \beta $ with the horizontal. The kinetic energy at the highest point is $( \frac{ 3}{ 4} )^{th}$ of the initial kinetic energy. The value of $ \beta $ is

7.
The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

8.
Two mirrors at an angle θº produce 5 images of a point. The number of images produced when θ is decreased to θº – 30º is

9.
A bullet of mass $m$ travelling with a speed $v$ hits a block of mass $M$ initially at rest and gets embedded in it. The combined system is free to move and there is no other force acting on the system. The heat generated in the process will be

11.
A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement S is given as a function of time (t) as