Work, Energy & Power: NEET Physics Previous Year Questions

248 previous year questions from Work, Energy & Power. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $An elevator in a building can carry a maximum of 10 persons, with the average mass of each person being 68 kg . The mass of the elevator itself is\dots$
2. $A particle is released from height S above the surface of the earth. At certain height its kinetic energy is three times its potential energy. The height from the surf\dots$
3. $A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greates\dots$
4. $A particle experiences a variable force F = (4 x i + 3 y^{2} j) in a horizontal x-y plane. Assume distance in meters and force is newton. If the particle moves from point (1\dots$
5. $The energy required to break one bond in DNA is 10^{- 20} J. This value (in eV) is nearly [NEET 2020]$
6. $A particle moves from a point (- 2 i + 5 j) to (4 j + 3 k) when a force of (4 i + 3 j) N is applied. How much work has been done by t\dots$
7. $Two similar springs P and Q have spring constants K_{P} and K_{Q}, such that K_{P} > K_{Q} . They are stretched, first by the same amount (case a), then by the sam\dots$
8. $A mass of 1 kg is thrown up with a velocity of 100 \frac{m}{s} . After 5 seconds, it explodes into two parts. One-part of mass 400 g comes down with a velocity 25\dots$
9. $A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg . The velocity of 18 kg mass is 6 m s^{- 1} . The kinetic energy of the other m\dots$
10. $A smooth chain of length 2 m is kept on a table such that its length of 60 cm hangs freely from the edge of the table. The total mass of the chai\dots$
11. $A block of mass 100 kg slides over a distance of 10 m on a horizontal surface. If the co-efficient of friction between the surfaces is 0.4 , then the work done\dots$
12. $An elastic spring of unstretched length L and force constant k is stretched by a small length x . It is further stretched by another small length y . Work done\dots$
13. $A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest, the force on the particle at time t is?$
14. $A force of 4 N acts on a 10 kg body initially at rest. Let W_{1} is work done by force during 0 \leq t \leq 1 s . Likewise W_{2} is the work done by forc\dots$
15. $If the potential energy between two molecules is given by U = - \frac{A}{r ^{6}} + \frac{B}{r ^{12}}, then at equilibrium, separation between molecules, and the potentia\dots$
16. $A stationary particle breaks into two parts of masses m_{A} and m_{B} which move with velocities v_{A} and v_{B} respectively. The ratio of their kine\dots$
17. $A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg . If the frictional force on the elevator is 4000 N, the speed\dots$
18. $An automobile of mass 'm' accelerates starting from origin and initially at rest, while the engine supplies constant power P. The position is given as a function of time\dots$
19. $Two masses of 1 g and 9 g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momenta is$
20. $A force acts on a body of mass 10 kg, resulting in its displacement given as x = (\frac{t ^{3}}{25}) m, where t is the time in seconds. The work d\dots$
21. $A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times. Assume that the potential energy lost each time he lowers the mass is\dots$
22. $A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 m s^{- 1} . It collides with a horizontal spring of force constant 200 N m^{- 1} . Th\dots$
23. $A body of mass 1 kg begins to move under the action of a time dependent force F = (2 t i + 3 t^{2} j) N, where i and j are unit vectors along X and Y axes. What p\dots$
24. $A block of mass 10 kg, moving in x -direction with a constant speed of 10 ms^{- 1}, is subjected to a retarding force F = 0.1 \times J / m during its tra\dots$
25. $If F = (60 i + 15 j - 3 k) N and v = (2 i - 4 j + 5 k) m / s, then instantaneous power is$

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Work, Energy & Power: NEET Physics Previous Year Questions

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