Work, Energy & Power · JEE Main previous year questions

2026 11 questions

1. Q322026 · 5 Apr 2026 · Shift 2

   A body of mass $m$ is taken from the surface of earth to a height equal to twice the radius of earth ($R_e$). The increase in potential energy will be ____. ($g$ is acceleration due to gravity at the surface of earth)

   1. A.$\frac{1}{2}mg{R}_e$
   2. B.$\frac{3}{4}mg{R}_e$
   3. C.$\frac{1}{4}mg{R}_e$
   4. D.$\frac{2}{3}mg{R}_e$
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   Answer: D

2. Q462026 · 5 Apr 2026 · Shift 2· Numerical answer

   A copper wire of length $3\mathrm{m}$ is stretched by $3\mathrm{mm}$ by applying an external force. The volume of the wire is $600\times 10^{-6}{\mathrm{m}}^3$. The elastic potential energy stored in the wire in stretched condition would be ____ $\mathrm{J}$. (Given Young modulus of copper $=1.1\times 10^{11}N/{\mathrm{m}}^2$)

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   Answer: 33

3. Q322026 · 4 Apr 2026 · Shift 1
   
   1. A.$X_1$
   2. B.$X_2$
   3. C.$X_3$
   4. D.All the metals will give out photo electrons with same kinetic energies.
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   Answer: A

4. Q462026 · 4 Apr 2026 · Shift 1· Numerical answer

   A $1\text{ kg}$ block subjected to two simultaneous forces $(2\hat{i}+3\hat{j}+4\hat{k})\text{ N}$ and $(3\hat{i}-\hat{j}-2\hat{k})\text{ N}$ is moved a distance of $25\text{ m}$ along $(3\hat{i}-4\hat{j})$ direction. The work done in this process is ________ $\text{J}$.

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   Answer: 35

5. Q332026 · 4 Apr 2026 · Shift 2

   Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: If the average kinetic energy of ${\mathrm{H}}_2$ and ${\mathrm{O}}_2$ molecules, kept in two different sized containers are same, then their temperatures will be same. Reason R: The r.m.s. speed of ${\mathrm{H}}_2$ and ${\mathrm{O}}_2$ molecules are same at same temperature. Choose the correct answer from the options given below

   1. A.Both A and R are true and R is the correct explanation of A
   2. B.Both A and R are true but R is NOT the correct explanation of A
   3. C.A is true but R is false
   4. D.A is false but R is true
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   Answer: C

6. Q312026 · 2 Apr 2026 · Shift 2

   If a body of mass $1\mathrm{kg}$ falls on the earth from infinity, it attains velocity ($v$) and kinetic energy ($k$) on reaching the surface of earth. The values of $v$ and $k$ respectively are ____. (Take radius of earth to be $6400\mathrm{km}$ and $g=9.8m/{\mathrm{s}}^2$)

   1. A.$11.2km/s$; $6.27\times 10^7\mathrm{J}$
   2. B.$11.2km/s$; $12.54\times 10^7\mathrm{J}$
   3. C.$8.8km/s$; $6.27\times 10^7\mathrm{J}$
   4. D.$8.8km/s$; $12.54\times 10^7\mathrm{J}$
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   Answer: A

7. Q472026 · 28 Jan 2026 · Shift 2· Numerical answer
   
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   Answer: 300

8. Q422026 · 23 Jan 2026 · Shift 1
   
   1. A.$4E$
   2. B.$2E$
   3. C.$\frac{4}{3}E$
   4. D.$3E$
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   Answer: D

9. Q352026 · 21 Jan 2026 · Shift 1

   A point charge of $10^{-8}\mathrm{C}$ is placed at origin. The work done in moving a point charge $2\mu \mathrm{C}$ from point $A(4,4,2)\mathrm{m}$ to $B(2,2,1)\mathrm{m}$ is ____ J. $\left(\frac{1}{4\pi {ϵ}_0}=9\times 10^9\text{ in SI units}\right)$

   1. A.$30\times 10^{-6}$
   2. B.0
   3. C.$15\times 10^{-6}$
   4. D.$45\times 10^{-6}$
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   Answer: A

10. Q362026 · 21 Jan 2026 · Shift 1

    A light wave described by $E=60\left[\sin \left(3\times 10^{15}\right)t+\sin \left(12\times 10^{15}\right)t\right]$ (in SI units) falls on a metal surface of work function $2.8\mathrm{eV}$ . The maximum kinetic energy of ejected photoelectron is (approximately) ____ eV. $\left(h=6.6\times 10^{-34}J.s.\text{ and }e=1.6\times 10^{-19}\mathrm{C}\right)$

    1. A.3.8
    2. B.7.8
    3. C.6.0
    4. D.5.1
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    Answer: D

11. Q392026 · 21 Jan 2026 · Shift 1
    
    1. A.$F_{BC}>F_{AB}>F_{DE}>F_{CD}$
    2. B.$F_{BC}>F_{CD}>F_{DE}>F_{AB}$
    3. C.$F_{CD}>F_{AB}>F_{BC}>F_{DE}$
    4. D.$F_{CD}>F_{DE}>F_{AB}>F_{BC}$
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    Answer: A