Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Work Energy and Power

59 questions · Physics · NEET
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Work Energy and Power

Work Energy and Power

59 questions · Physics · NEET

  1. The kinetic energies of two similar cars A and B are 100 J and 225 J respectively. On applying breaks, car A stops after 1000 m and car B stops after 1500 m . If FA​ and FB​ are the forces applied by the breaks on cars A and B…2025 · Q140 · MCQ
  2. A bob of heavy mass m is suspended by a light string of length /. The bob is given a horizontal velocity v0​ as shown in figure. If the string gets slack at some point P making an angle θ from the horizontal, the ratio of… Includes diagram2025 · Q165 · MCQ
  3. At any instant of time t, the displacement of any particle is given by 2t−1 (SI unit) under the influence of force of 5 N. The value of instantaneous power is (in SI unit):2024 · Q169 · MCQ
  4. An object moving along horizontal x-direction with kinetic energy 10 J is displaced through x=(3i^)m by the force F=(−2i^+3j^​)N. The kinetic energy of the object at the end…2024 · Q158 · MCQ
  5. An object falls from a height of 10 m above the ground. After striking the ground it loses 50% of its kinetic energy. The height upto which the object can rebounce from the ground is:2024 · Q159 · MCQ
  6. A particle moves with a velocity (5i^−3j^​+6k^) ms−1 horizontally under the action of constant force (10i^+10j^​+20k^)N. The instantaneous power…2023 · Q139 · MCQ
  7. The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm, potential energy stored in it will be :2023 · Q149 · MCQ
  8. The restoring force of a spring with a block attached to the free end of the spring is represented by2022 · Q147 · MCQ
  9. An electric lift with a maximum load of 2000 kg (lift + passengers) is moving up with a constant speed of 1.5 ms−1. The frictional force opposing the motion is 3000 N. The minimum power delivered by the motor to the lift in watts is : (g…2022 · Q139 · MCQ
  10. The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is2022 · Q146 · MCQ
  11. A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are…2021 · Q139 · MCQ
  12. Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s2)2021 · Q141 · MCQ
  13. A force F = 20 + 10y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is :2019 · Q138 · MCQ
  14. A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to Includes diagram2018 · Q142 · MCQ
  15. Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m s−1. Take 'g' constant with a value 10 m s−2. The work done by the (i) gravitational force and the (ii) resistive…2017 · Q149 · MCQ
  16. A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic enegy of the particle becomes equal to 8 × 10−4 J by the end of the…2016 · Q144 · MCQ
  17. A body of mass 1 kg begins to move under the action of a time dependent force F=(2ti+3t2J)N, where i and j​ are unit vectors along x and y axis. What…2016 · Q145 · MCQ
  18. What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?2016 · Q146 · MCQ
  19. A particle moves from a point (−2i+5j​) to (4j​+3k) when a force of (4i+3j​) N is applied. How much work has been done by…2016 · Q146 · MCQ
  20. Two particles A and B, move with constant velocities v1​​ and v2​​. At the initial moment their position vectors are r1​​ and r2​​…2015 · Q133 · MCQ
  21. A ball is thrown vertically downwards from a height of 20 m with an initial velocity v0. It collides with the ground, losses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v0 is (Take g = 10 m s−…2015 · Q134 · MCQ
  22. The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6 × 103 kg/m3 and g = 10 m/s2 then the power (in watt) is2015 · Q135 · MCQ
  23. On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle θ to its initial direction and has…2015 · Q136 · MCQ
  24. A block of mass 10 kg, moving in x direction with a constant speed of 10 m s−1, is subjected to a retarding force F = 0.1x J/m during its travel from x = 20 m to 30 m. Its final KE will be2015 · Q139 · MCQ
  25. 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 is2015 · Q140 · MCQ
  26. Two similar springs P and Q have spring constants KP and KQ, such that KP > KQ. They are stretched first by the same amount (case a), then by the same force (case b). The work done by the springs WP and WQ are related as, in case (a)…2015 · Q142 · MCQ
  27. A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when2013 · Q149 · MCQ
  28. One coolie takes 1 minute to raise a suitcase through a height of 2 m but the second coolie takes 30 s to raise the same suitcase to the same height. The powers of two coolies are in the ratio2013 · Q150 · MCQ
  29. A uniform force of (3i+j​) newton acts on a particle of mass 2 kg. Hence the particle is displaced from position (2i+k) metre to position (4i+3j​−k)…2013 · Q147 · MCQ
  30. A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude P0. The instantaneous velocity of this car is proportional to2012 · Q105 · MCQ
  31. 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. The maximum compression produced in the spring will be2012 · Q157 · MCQ
  32. The potential energy of a particle in a force field is U=r2A​−rB​ where A and B are positive constants and r is the distance of particle from the centre of the field. For stable equilibrium, the distance of the…2012 · Q158 · MCQ
  33. A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to a mass of 3m moving vertically upwards (along the y-axis) with velocity 2v. The final velocity of the combination is2011 · Q104 · MCQ
  34. The potential energy of a system increases if work is done2011 · Q151 · MCQ
  35. Force F on a particle moving in a straight line varies with distance d as shown in figure. The work done on the particle during its displacement of 12 m is Includes diagram2011 · Q152 · MCQ
  36. 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 greatest2011 · Q153 · MCQ
  37. A particle of mass m is released from rest and follows a parabolic path as shown. Assuming that the displacement of the mass from the origin is small, which graph correctly depicts the position of the particle as a function of time ? Includes diagram2011 · Q154 · MCQ
  38. A particle of mass M, starting from rest, undergoes uniform acceleration. If the speed acquired in time T is V, the power delivered to the particle is2010 · Q98 · MCQ
  39. A ball moving with velocity 2 m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in m/s) after collision will be2010 · Q170 · MCQ
  40. An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine?2010 · Q171 · MCQ
  41. A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s2)2009 · Q157 · MCQ
  42. A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in…2009 · Q159 · MCQ
  43. An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?2009 · Q160 · MCQ
  44. Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s2)2008 · Q154 · MCQ
  45. A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the…2007 · Q135 · MCQ
  46. 300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Work done against friction is (Take g = 10 m/s2)2006 · Q158 · MCQ
  47. The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is2006 · Q159 · MCQ
  48. A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = 31​t2, where t is in seconds. Work done by the force in 2 seconds is2006 · Q160 · MCQ
  49. A force F acting on an object varies with distance x as shown here. The force is in N and x in m. The work done by the force in moving the object from x = 0 to x = 6 m is Includes diagram2005 · Q160 · MCQ
  50. A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet ball building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of2004 · Q144 · MCQ
  51. A particle of mass m1 is moving with a velocity v1 and another particle of mass m2 is moving with a velocity v2. Both of them have the same momentum but their different kinetic energies are E1 and E2 respectively. If m1 > m2 then :2004 · Q145 · MCQ
  52. A mass of 0.5 kg moving with a speed of 1.5 m/s on horizontal smooth surface, collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be Includes diagram2004 · Q146 · MCQ
  53. A particle moves along a circle of radius (π20​) m with constants tangential acceleration. If the velocity of vthe particle is 80 m/s at the end of the second revoluation after motion has begun, the…2003 · Q154 · MCQ
  54. When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be2003 · Q157 · MCQ
  55. A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, its maximum speed will be2001 · Q156 · MCQ
  56. A particle is projected making an angle of 45o with horizontal having kinetic energy K. The kinetic energy at highest point will be2001 · Q157 · MCQ
  57. Two springs A and B having spring constant KA and KB (KA = 2KB) are stretched by applying force of equal magnitude. If energy stored in spring A is EA then energy stored in B will be2001 · Q158 · MCQ
  58. If F=(60i+15j​−3k) N and v=(2i−4j​+5k) m/s, then instantaneous power is2000 · Q151 · MCQ
  59. A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s. The velocity of other part is (Take g = 10 ms−2)2000 · Q152 · MCQ