Work Power & Energy PYQs - Last 10 Years
JEE Main / Physics / Mechanics / 125 recent questions
PhysicsMechanics2017-2026
Practice 125 JEE Main Physics questions from Work Power & Energy. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 10 Years Work Power & Energy Questions
Showing 50 of 125 filtered questions.
1Work Power And Energy
The rain drop of mass 1 g , starts with zero velocity from a height of 1 km . It hits the ground with a speed of $5 \mathrm{~m} / \mathrm{s}$. The work done by the unknown resistive force is $\_\_\_\_$ J.
(take $\mathrm{g}=10 \mathrm{~m} / ...
(take $\mathrm{g}=10 \mathrm{~m} / ...
MCQ+4 / -12026
2Work Power And Energy
The velocity at which 6 kg mass (shown in figure) strikes the ground when it is released from a height of 6 m above the ground is $\_\_\_\_$ $\mathrm{m} / \mathrm{s}$. Assume pulley is massless and string is light and inextensible. (Take $\...
MCQ+4 / -12026
3Work Power And Energy
A body of mass 1 kg moves along a straight line with a velocity $v=2 x^2$. The work done by the body during displacement from $x=0$ to 5 m is $\_\_\_\_$ J.
MCQ+4 / -12026
4Work Power And Energy
A mass of 1 kg is kept on a inclined plane with $30^{\circ}$ inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of $4 \mathrm{~m} / \mathrm{s}$. The work done...
MCQ+4 / -12026
5Work Power And Energy
A 1 kg block subjected to two simultaneous forces $(2 \hat{\mathrm{i}}+3 \hat{\mathrm{j}}+4 \hat{\mathrm{k}}) \mathrm{N}$ and $(3 \hat{\mathrm{i}}-\hat{\mathrm{j}}-2 \hat{\mathrm{k}}) \mathrm{N}$ is moved a distance of 25 m along $(3 \hat{\...
INTEGER+4 / -12026
6Work Power And Energy
A body of mass 2 kg begins to move under the influence of time dependent force $\overrightarrow{\mathrm{F}}=\left(2 \mathrm{t} \hat{\mathrm{i}}+6 \mathrm{t}^2 \hat{\mathrm{j}}\right) \mathrm{N}$, where $\hat{\mathrm{i}}$ and $\hat{\mathrm{j...
INTEGER+4 / -12026
7Work Power And Energy
A spherical ball of mass 2 kg falls from a height of 10 m and is brought to rest after penetrating 10 cm into sand. The average force exerted by sand on the ball is _________ N.(Take $g = 10 \ \mathrm{m/s^2}$)
MCQ+4 / -12026
8Work Power And Energy
Two blocks with masses 100 g and 200 g are attached to the ends of springs $A$ and $B$ as shown in figure. The energy stored in $A$ is $E$. The energy stored in $B$, when spring constants $k_A, k_B$ of $A$ and $B$, respectively satisfy the ...
MCQ+4 / -12026
9Work Power And Energy
An object is projected with kinetic energy $K$ from a point $A$ at an angle $60^{\circ}$ with the horizontal. The ratio of the difference in kinetic energies at points $B$ and $C$ to that at point $A$ (see figure), in the absence of air fri...
MCQ+4 / -12026
10Work Power And Energy
A bead $P$ sliding on a frictionless semi-circular string $(A C B)$ and it is at point $S$ at $t =0$ and at this instant the horizontal component of its velocity is $v$. Another bead $Q$ of the same mass as $P$ is ejected from point $A$ at ...
MCQ+4 / -12026
11Work Power And Energy
Given below are two statements :
Statement I : An object moves from position $r_1$ to position $r_2$ under a conservative force field $\vec{F}$. The work done by the force is $W=-\int\limits_{r_1}^{r_2} \vec{F} \cdot \overrightarrow{d r}$.
...
Statement I : An object moves from position $r_1$ to position $r_2$ under a conservative force field $\vec{F}$. The work done by the force is $W=-\int\limits_{r_1}^{r_2} \vec{F} \cdot \overrightarrow{d r}$.
...
MCQ+4 / -12026
12Work Power And Energy
Potential energy ( $V$ ) versus distance ( $x$ ) is given by the graph. Rank various regions as per the magnitudes of the force ( $F$ ) acting on a particle from high to low.
MCQ+4 / -12026
13Work Power And Energy
A body of mass 2 kg is moving along x-direction such that its displacement as function of time is given by $x(t) = \alpha t^2 + \beta t + \gamma$ m, where $\alpha = 1 \; m/s^2$, $\beta = 1 \; m/s$ and $\gamma = 1 \; m$. The work done on the...
MCQ+4 / -12026
14Work Power And Energy
An object of mass 1000 g experiences a time dependent force $\vec{F}=\left(2 t \hat{i}+3 t^2 \hat{j}\right) N$. The power generated by the force at time $t$ is:
MCQ+4 / -12025
15Work Power And Energy
Which one of the following forces cannot be expressed in terms of potential energy?
MCQ+4 / -12025
16Work Power And Energy
A block of mass 25 kg is pulled along a horizontal surface by a force at an angle $45^{\circ}$ with the horizontal. The friction coefficient between the block and the surface is 0.25 . The block travels at a uniform velocity. The work done ...
MCQ+4 / -12025
17Work Power And Energy
A particle is released from height $S$ above the surface of the earth. At certain height its kinetic energy is three times its potential energy. The height from the surface of the earth and the speed of the particle at that instant are resp...
MCQ+4 / -12025
18Work Power And Energy
In a hydraulic lift, the surface area of the input piston is 6 cm2 and that of the output piston is 1500 cm2. If 100 N force is applied to the input piston to raise the output piston by 20 cm, then the work done is _______ kJ.
INTEGER+4 / -12025
19Work Power And Energy
A sand dropper drops sand of mass m(t) on a conveyer belt at a rate proportional to the square root of speed (v) of the belt, i.e., $\frac{dm}{dt} \propto \sqrt{v}$. If P is the power delivered to run the belt at constant speed then which o...
MCQ+4 / -12025
20Work Power And Energy
A bead of mass ' $m$ ' slides without friction on the wall of a vertical circular hoop of radius ' $R$ ' as shown in figure. The bead moves under the combined action of gravity and a massless spring (k) attached to the bottom of the hoop. T...
MCQ+4 / -12025
21Work Power And Energy
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason $\mathbf{R}$
Assertion A: In a central force field, the work done is independent of the path chosen.
Reason R: Every force encountered in mec...
Assertion A: In a central force field, the work done is independent of the path chosen.
Reason R: Every force encountered in mec...
MCQ+4 / -12025
22Work Power And Energy
A body of mass 4 kg is placed on a plane at a point $P$ having coordinate $(3,4) \mathrm{m}$. Under the action of force $\overrightarrow{\mathrm{F}}=(2 \hat{i}+3 \hat{j}) \mathrm{N}$, it moves to a new point Q having coordinates $(6,10) \ma...
MCQ+4 / -12025
23Work Power And Energy
A force $\mathrm{F}=\alpha+\beta \mathrm{x}^2$ acts on an object in the x -direction. The work done by the force is 5 J when the object is displaced by 1 m . If the constant $\alpha=1 \mathrm{~N}$ then $\beta$ will be
MCQ+4 / -12025
24Work Power And Energy
A force $\mathrm{f}=\mathrm{x}^2 \mathrm{y} \hat{\mathrm{i}}+\mathrm{y}^2 \hat{\mathrm{j}}$ acts on a particle in a plane $\mathrm{x}+\mathrm{y}=10$. The work done by this force during a displacement from $(0,0)$ to $(4 \mathrm{~m}, 2 \math...
INTEGER+4 / -12025
25Work Power And Energy
A ball having kinetic energy KE, is projected at an angle of $60^{\circ}$ from the horizontal. What will be the kinetic energy of ball at the highest point of its flight?
MCQ+4 / -12025
26Work Power And Energy
A force $\overrightarrow{\mathrm{F}}=2 \hat{i}+\mathrm{b} \hat{j}+\hat{k}$ is applied on a particle and it undergoes a displacement $\hat{i}-2 \hat{j}-\hat{k}$ What will be the value of $b$, if work done on the particle is zero.
MCQ+4 / -12025
27Work Power And Energy
A particle of mass \(m\) moves on a straight line with its velocity increasing with distance according to the equation \(v=\alpha \sqrt{x}\), where \(\alpha\) is a constant. The total work done by all the forces applied on the particle duri...
MCQ+4 / -12024
28Work Power And Energy
A force \((3 x^2+2 x-5) \mathrm{N}\) displaces a body from \(x=2 \mathrm{~m}\) to \(x=4 \mathrm{~m}\). Work done by this force is ________ J.
INTEGER+4 / -12024
29Work Power And Energy
Three bodies A, B and C have equal kinetic energies and their masses are \(400 \mathrm{~g}, 1.2 \mathrm{~kg}\) and \(1.6 \mathrm{~kg}\) respectively. The ratio of their linear momenta is :
MCQ+4 / -12024
30Work Power And Energy
A block is simply released from the top of an inclined plane as shown in the figure above. The maximum compression in the spring when the block hits the spring is :
MCQ+4 / -12024
31Work Power And Energy
A bullet of mass \(50 \mathrm{~g}\) is fired with a speed \(100 \mathrm{~m} / \mathrm{s}\) on a plywood and emerges with \(40 \mathrm{~m} / \mathrm{s}\). The percentage loss of kinetic energy is :
MCQ+4 / -12024
32Work Power And Energy
Four particles \(A, B, C, D\) of mass \(\frac{m}{2}, m, 2 m, 4 m\), have same momentum, respectively. The particle with maximum kinetic energy is :
MCQ+4 / -12024
33Work Power And Energy
When kinetic energy of a body becomes 36 times of its original value, the percentage increase in the momentum of the body will be :
MCQ+4 / -12024
34Work Power And Energy
A body of mass \(50 \mathrm{~kg}\) is lifted to a height of \(20 \mathrm{~m}\) from the ground in the two different ways as shown in the figures. The ratio of work done against the gravity in both the respective cases, will be :
MCQ+4 / -12024
35Work Power And Energy
A body is moving unidirectionally under the influence of a constant power source. Its displacement in time t is proportional to :
MCQ+4 / -12024
36Work Power And Energy
If a rubber ball falls from a height \(h\) and rebounds upto the height of \(h / 2\). The percentage loss of total energy of the initial system as well as velocity ball before it strikes the ground, respectively, are :
MCQ+4 / -12024
37Work Power And Energy
A body of \(m \mathrm{~kg}\) slides from rest along the curve of vertical circle from point \(A\) to \(B\) in friction less path. The velocity of the body at \(B\) is:
(given, \(R=14 \mathrm{~m}, g=10 \mathrm{~m} / \mathrm{s}^2\) and $$\sq...
(given, \(R=14 \mathrm{~m}, g=10 \mathrm{~m} / \mathrm{s}^2\) and $$\sq...
MCQ+4 / -12024
38Work Power And Energy
A body of mass \(2 \mathrm{~kg}\) begins to move under the action of a time dependent force given by \(\vec{F}=\left(6 t \hat{i}+6 t^2 \hat{j}\right) N\). The power developed by the force at the time \(t\) is given by:
MCQ+4 / -12024
39Work Power And Energy
A particle is placed at the point \(A\) of a frictionless track \(A B C\) as shown in figure. It is gently pushed towards right. The speed of the particle when it reaches the point B is : (Take \(g=10 \mathrm{~m} / \mathrm{s}^2\)).
MCQ+4 / -12024
40Work Power And Energy
A block of mass \(1 \mathrm{~kg}\) is pushed up a surface inclined to horizontal at an angle of \(60^{\circ}\) by a force of \(10 \mathrm{~N}\) parallel to the inclined surface as shown in figure. When the block is pushed up by $$10 \mathrm...
MCQ+4 / -12024
41Work Power And Energy
The potential energy function (in \(J\) ) of a particle in a region of space is given as \(U=\left(2 x^2+3 y^3+2 z\right)\). Here \(x, y\) and \(z\) are in meter. The magnitude of \(x\)-component of force (in \(N\) ) acting on the particle ...
MCQ+4 / -12024
42Work Power And Energy
A block of mass \(100 \mathrm{~kg}\) slides over a distance of \(10 \mathrm{~m}\) on a horizontal surface. If the co-efficient of friction between the surfaces is 0.4, then the work done against friction \((\operatorname{in} J\)) is :
MCQ+4 / -12024
43Work Power And Energy
A bob of mass '\(m\)' is suspended by a light string of length '\(L\)'. It is imparted a minimum horizontal velocity at the lowest point \(A\) such that it just completes half circle reaching the top most position B. The ratio of kinetic en...
MCQ+4 / -12024
44Work Power And Energy
A bullet is fired into a fixed target looses one third of its velocity after travelling \(4 \mathrm{~cm}\). It penetrates further \(\mathrm{D} \times 10^{-3} \mathrm{~m}\) before coming to rest. The value of \(\mathrm{D}\) is :
MCQ+4 / -12024
45Work Power And Energy
A ball suspended by a thread swings in a vertical plane so that its magnitude of acceleration in the extreme position and lowest position are equal. The angle \((\theta)\) of thread deflection in the extreme position will be :
MCQ+4 / -12024
46Work Power And Energy
A body of mass \(5 \mathrm{~kg}\) is moving with a momentum of \(10 \mathrm{~kg} \mathrm{~ms}^{-1}\). Now a force of \(2 \mathrm{~N}\) acts on the body in the direction of its motion for \(5 \mathrm{~s}\). The increase in the Kinetic energy...
INTEGER+4 / -12023
47Work Power And Energy
A bullet of mass \(0.1 \mathrm{~kg}\) moving horizontally with speed \(400 \mathrm{~ms}^{-1}\) hits a wooden block of mass \(3.9 \mathrm{~kg}\) kept on a horizontal rough surface. The bullet gets embedded into the block and moves $$20 \math...
MCQ+4 / -12023
48Work Power And Energy
A particle of mass \(10 \mathrm{~g}\) moves in a straight line with retardation \(2 x\), where \(x\) is the displacement in SI units. Its loss of kinetic energy for above displacement is \(\left(\frac{10}{x}\right)^{-n}\) J. The value of $$...
INTEGER+4 / -12023
49Work Power And Energy
A body is dropped on ground from a height '\(h_{1}\)' and after hitting the ground, it rebounds to a height '\(h_{2}\)'. If the ratio of velocities of the body just before and after hitting ground is 4 , then percentage loss in kinetic ener...
INTEGER+4 / -12023
50Work Power And Energy
A lift of mass \(\mathrm{M}=500 \mathrm{~kg}\) is descending with speed of \(2 \mathrm{~ms}^{-1}\). Its supporting cable begins to slip thus allowing it to fall with a constant acceleration of \(2 \mathrm{~ms}^{-2}\). The kinetic energy of ...
INTEGER+4 / -12023