CHAPTER 5 Work, Power, Energy and Circular Motion
Sign in to Google to save your progress. Learn more
Student's Name: *
1. A position dependent force F = 7 – 2x + 3x2 N acts on a small body of mass 2 kg and displaces it from x = 0 to x = 5 m. The work done in joule is *
1 point
2. A car of 1400 kg is moving on a circular path of radius 30 m with a speed of 40 km/h. When the driver applies the brakes and the car continues to move along the circular path, what is the maximum deceleration possible if the tyres are limited to a total horizontal friction of 10.6 kN? *
1 point
3. Three identical cars A, B and C are moving at the same speed on three bridges. The car A goes on a plane bridge B on a bridge convex upwards and C goes on a bridge concave upwards. Let FA, FB and FC be the normal forces exerted by the cars on the bridges when they are at the middle of the bridges. Then *
1 point
4. A string of length L is fixed at one end and carries a mass M at the other end. The string makes 2/p revolutions per second around the vertical axis through the fixed end as shown in the figure, then tension in the string is *
1 point
5. Two spheres of equal masses are attached to a string of length 2 m as shown in the figure. The string and the spheres are then whirled in a horizontal circle about O at a constant rate. What is the value of the ratio Tension in the string between and Tension in the string P Q between P O and  *
1 point
6. Two wires AC and BC are tied at C to a small sphere of mass 5 kg, which revolves at a constant speed v in the horizontal circle of radius 1.6 m. The minimum value of v is *
1 point
7. A stone of mass 1 kg tied to a light inextensible string of length L = 10/3 m is whirling in a circular path of radius L, in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension is 4 and if g is taken to be 10 m/s2 , the speed of the stone at the highest point of the circle is n *
1 point
8. A heavy small-sized sphere is suspended by a string of length l. The sphere rotates uniformly in a horizontal circle with the string making an angle q with the vertical. Then the time period of this conical pendulum is *
1 point
9. A body of mass M kg is on the top point of a smooth hemisphere of radius 5 m. It is released to slide down the surface of the hemisphere. It leaves the surface when its velocity is 5 m/s. At this instant the angle made by the radius vector of the body with the vertical is (Acceleration due to gravity = 10 m/s) *
1 point
10. A small block slides down from the top of a hemisphere of radius r. It is assumed that there is no friction between the block and the hemisphere. At what height, h will the block lose contact with the surface of sphere? *
1 point
11. A hollow vertical cylinder of radius R and height h has smooth internal surface. A small particle is placed in contact with the inner side of the upper rim at a point P. It is given a horizontal speed v0 tangential to rim. It leaves the lower rim at point Q, vertically below P. The number of revolutions made by the particle will be *
1 point
12. A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of 0.5 m/s. What is the height of the plane of circle from vertex of the funnel? *
1 point
13. A person with a mass of M kg stands in contact against the wall of a cylindrical drum of radius r rotating with an angular velocity w. If the coefficient of friction between the wall and the clothing is m, the minimum rotational speed of the cylinder which enables the person to remain stuck to the wall when the floor is suddenly removed, *
1 point
14. A force ˆ ˆ F=( ai+ bj ) N acts on a body and displace it by ˆ ˆ s =(ci +dj)  m. The work done by the force is *
1 point
15. A body of mass 3.0 kg moves under the influence of some external force such that its position s as a function of time t is given by s t = − 6 1 t + 3 2 where s is in metres and t is in seconds. The work done by the force in first three seconds is *
1 point
16. The work done by a force F = kx2 acting on a particle at an angle 60° with x-axis to displace it from x = 2 m to x = 3 m is *
1 point
  17. A particle of mass m is moving along +y direction under the influence of force. The displacement of the particle is related with time as y t = − t + 2 6 9 The displacement (in metre) of the particle when it comes to rest, is   *
1 point
18. . In Q.No. 16, the work done (in joule) by the particle in first six second is *
1 point
19. A particle moves along the x-axis from x = 1 to x = 3 m under the influence of a force F x = − 3 2x + 5 2 newton. The work done in this process is *
1 point
20. A force ˆ ˆ F k yi xj =- + ( ),  where k is a constant, acts on a particle moving in the x-y plane. Starting from the origin, the particle is taken from the origin (0, 0) to the point (a, 0) and then from the point (a, 0) to the point (a, a). The total work done by the forc  F on the particle is *
1 point
21. A body of mass 6 kg is acted upon by a force which causes a displacement in it given by x t = 2 4 m where t is the time in second. The work done by the force in 2 second is *
1 point
22. A body starts from rest and acquires a velocity V in time T. The work done on the body in time t will be proportional to *
1 point
23. Force-displacement curve for a body is shown in the figure. 0 1 2 3 4 5 6 7 8 +20 +10 −10 −20 Displacement (m) Force (N) Motion is in one dimensional. Work done by the force in displacing the body from displacement zero to 6 m is given by *
1 point
24. A particle moves along a curve of unknown shape but magnitude of force  F is constant and always acts along the tangent to the curve. Then *
1 point
25. A rain drop of radius r falls from a certain height h above the ground. The work done by the gravitational force is proportional to *
1 point
27. The closed line integral of force  F taken along the closed curve is given by F dlˆ ò ×   Objective Physics for NEET_Chapter_5.indd 15 7/25/2017 3:38:56 PM  If the force  F is conservative, then the value of this integral is *
1 point
  28. One man takes 1 minute to raise a box to a height of 1 m and another man takes 1/2 minute to do so. The energy of the two is   *
1 point
29. During the swinging of simple pendulum, *
1 point
30. It is easier to draw up a wooden block along an inclined plane then to haul it up vertically, principally because *
1 point
31. The figure shows the vertical section of a frictionless surface. A block of mass 2.0 kg is released from position A. Its kinetic energies (in J) as it reaches positions B, C and D (Given gravitational field 9.8 J/m/kg) are *
1 point
32. A boy whose mass is 51 kg climbs, with constant speed, a vertical rope, 6 m long in 10 seconds. How much work does the boy perform and what will be the power output of the boy during the climb? (Take g = 10 m/s2 ) *
1 point
33. ABCDE is a channel in the vertical plane, part BCDE being circular with radius r. A block is released from A and slides without friction and without rolling. The block will complete the loop if h is *
1 point
 34. A ball is thrown up from the earth by a person and then caught by him on its return. When the ball falls towards the earth, the ratio of kinetic energies gained by the ball (KB) and the earth (KE) is *
1 point
35. A rubber ball is dropped from a height of 5 m on the surface of a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of *
1 point
36. 10 litres of water per second is lifted from a well through 20 m and delivered with a velocity of 10 m/s, then the power (in kW) of the motor is (Take g = 10 m/s2 ) *
1 point
37. Two springs P and Q are stretched by applying forces of equal magnitudes at the four ends. If the spring constant of P is 2 times greater than that of Q and the energy stored in P is E, then the energy stored in Q is *
1 point
38. The potential energy of a particle of mass 5 kg moving in the x-y plane is given by U = –7x + 24y joule, x and y being in metre. Initially at t = 0 the particle is at the origin and moving with velocity ˆ ˆ (2 3 ) i j + m/s. The magnitude of the force on the particle and the acceleration of the particle are *
1 point
39. The potential energy of a body is given by U x = + 40 6 7 − + xy 8 3 y z + 2 2 2 where U is in joule and x, y, z in metre. Deduce the x, y and z components of the force (in newton) on the body when it is in position (–2, 0, + 5) *
1 point
  40. An elastic string of unstretched length l and force constant k is stretched by a small length x. It is further stretched by another small length y. The work done in the second stretching is   *
1 point
41. In the equilibrium position, a body has *
1 point
42. The force F acting on a body moving along x-axis varies with the position x of the particle as shown in the graph. The body is in stable equilibrium at *
1 point
43. Power is *
1 point
44. An ideal spring with spring constant k is hung from the ceiling and a block of mass m is attached to its lower end. The mass is released with the spring initially unstreched. The maximum extension in the spring is *
1 point
45. The potential energy of a 1 kg particle free to move along the x-axis is given by V (x 2/4 x2/2)=  J. The total mechanical energy of the particle is 2 J. Then the maximum speed is *
1 point
46. A body of mass m accelerates uniformly from rest to v1 in time t 1 . The instantaneous power delivered to the body as a function of time t is *
1 point
47. One man takes 1 minute to raise a box to a height of 1 m and another man takes 1/2 minute to do so. The energy of the two is *
1 point
48. If the potential energy of a gas molecule is U M r N r = − 6 12 M and N being positive constants, then the potential energy at equilibrium must be *
1 point
49. The block of mass M moving on the frictionless horizontal surface collides with a spring of spring constant k and compresses it by length L. The maximum momentum of the block after collision is *
1 point
50. A body of mass 4 kg is moving with momentum of 8 kg-m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 s. The increase in KE in joule is *
1 point
51. A running man has the same kinetic energy as that of a boy of half his mass. The man speeds up by 2 m/s and the boy changes his speed by x m/s so that the kinetic energies of the boy and the man are again equal. Then x in m/s is *
1 point
52. A body is moving along a straight line by a machine delivering a constant power. The distance moved by the body in time t is proportional to *
1 point
53. In Q.No. 52, the power, delivered by the machine is *
1 point
54. The kinetic energy K of a particle moving along a circular path of radius r depends upon the distance s as K = As2 The force acting on the particle is *
1 point
55. The kinetic energy K of a particle of mass m moving along a straight line depends upon the displacement s as K = As2 The force acting on the particle is *
1 point
56. A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time t as ac = k2 rt2 , where k is a constant. The power delivered to the particle by the forces acting on it is *
1 point
57. A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It rolls down a smooth surface to the ground, then climbs up another hill of height 30 m and finally rolls down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is *
1 point
58. A particle of mass 1 g executes an oscillatory motion on a concave surface of spherical dish of radius 2 m placed on a horizontal plane. If the motion of the particle begins from a point on the dish at the height 1 cm from the horizontal plane and coefficient of friction is 0.01, find the total distance covered by the particle before it comes to rest (Assume the radius of curvature of the concave surface to be very large). *
1 point
59. If W1 , W2 and W3 represent the work done in moving a particle from A to B along three different paths, 1, 2 and 3 (as shown in the figure) in the gravitational field of a point mass m, find the correct relation between W1 , W2 and W3 . *
1 point
60,  A body of mass 4 kg is moving with momentum of 8 kg-m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 s. The increase in KE in joule is   *
1 point
61. If ˆ ˆ ˆ F i jk = +- (60 15 3 ) N and  ˆ ˆ ˆ v i jk = -+ (2i -4j )5 k  m/s, then instantaneous power is *
1 point
62. The masses of two substances are 25 g and 89 g respectively. If their kinetic energies are the same, then ratio of their momentum is *
1 point
63. Two springs of springs constant 1500 N/m and 3000 N/m respectively are stretched with the same force. They will have the potential energies in the ratio of *
1 point
64. A particle is projected making an angle of 45° with horizontal having kinetic energy K. The kinetic energy at highest point will be *
1 point
65. 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 be *
1 point
66. 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 wil *
1 point
67. A pendulum bob has a speed of 3 m/s at its lowest position. The pendulum is 0.5 m long. The speed of the bob, when length makes an angle 60 ° to the vertical is *
1 point
68. If kinetic energy of a body is increased by 300% then percentage change in momentum will be *
1 point
69. A machine delivering constant power moves a body along straight line. The distance moved by the body in time t is proportional to *
1 point
70. Work done by a simple pendulum in one complete oscillation is *
1 point
71. A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities v1 and v2 . The ratio of their kinetic energies E1 /E2 is *
1 point
72. When a long spring is stretched by 2 cm, its potential energy is U. If the spring is strethced by 10 cm, the potential energy stored in it will be *
1 point
73. A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of *
1 point
74. 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 *
1 point
75. 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. The kinetic energy of the other mass is *
1 point
76. A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10 cm. What is the loss of the energy? *
1 point
77. A force F acting on an object 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 0 1 2 3 4 5 6 7 3 2 1 F(N) x(m) *
1 point
78. 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 t = 1 3 2 , where t is in seconds. Work done by the force in 2 seconds is *
1 point
79. 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 is *
1 point
80. 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/s *
1 point
81. 300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Taking g = 10 m/s2 , work done against friction is *
1 point
82. 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 process is *
1 point
83. Water falls from a height of 60 m at the rate of 1.5 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 ) *
1 point
84. 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 *
1 point
85. 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? *
1 point
86. 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 is *
1 point
87. The potential energy of a system increases if work is done *
1 point
88. 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 greatest *
1 point
89. 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 *
1 point
90.. The potential energy of a particle in a force field is A r B r 2 − 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 particle is *
1 point
91. A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 m/s. It collides with a horizontal spring of force constant 200 N/m. The maximum compression produced in the spring will be *
1 point
92. An electron and a proton are moving under the influence of mutual forces. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. This is because, *
1 point
93. A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is *
1 point
94. A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process i *
1 point
95. A bicyclist comes to a skidding stop in 10 m. During this process, the force on the bicycle due to the road is 200 N and is directly opposed to the motion. The work done by the cycle on the road is *
1 point
96. A body is falling freely under the action of gravity alone in vacuum. Which of the following quantities remain constant during the fall? *
1 point
97. During inelastic collision between two bodies, which of the following quantities always remain conserved? *
1 point
98. Two inclined frictionless tracks, one gradual and the other steep meet at A from where two stones are allowed to slide down from rest, one on each track as shown in below figure. B 1θ 2 θ C A h I II Which of the following statement is correct? *
1 point
99. The potential energy function for a particle executing linear SHM is given by V x( ) = kx 1 2 2 where k is the force constant of the oscillator as shown in below figure. For k = 0.5 N/m, the graph of V(x) versus x is shown in the figure. A particle of total energy E turns back when it reaches x = ± xm. If V and K indicate the PE and KE, respectively of the particle at x = +xm, then which of the following is correct? *
1 point
  100. During inelastic collision between two bodies, which of the following quantities always remain conserved?   *
1 point
101. A body of mass 0.5 kg travels in a straight line with velocity v = a x3/2 where a = 5 m–1/2s–1. The work done by the net force during its displacement from x = 0 to x = 2 m is *
1 point
102. In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1 m/s at 45° from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10 m/s2 , the kinetic energy of the shotput when it just reaches the ground will be  *
1 point
103 A cricket ball of mass 150 g moving with a speed of 126 km/h hits at the middle of the bat, held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat. Assuming that collision between ball and bat is completely elastic and the two remain in contact for 0.001 s, the force that the batsman had to apply to hold the bat firmly at its place would be *
1 point
104. Kinetic energy, with any reference, must be *
1 point
105. A body of mass 5 kg is raised vertically to a height of 10 m by a force of 170 N. The velocity of the body at this height will be *
1 point
106. If the radii of circular paths of two particles of same masses are in the ratio 1 : 2, then to have a constant centripetal force, their velocities should be in a ratio of *
1 point
107. Which of the following is a non-conservative force? *
1 point
 108. If the water falls from a dam into a turbine wheel 19.6 m below then the velocity of water at the turbine, is (Take g = 9.8 m/s2 ) *
1 point
109. A spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm, is *
1 point
110. If the kinetic energy of a body becomes four times of its initial value, then new momentum will *
1 point
111. A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/s. The centripetal force, is *
1 point
112. If a cyclist moving with a speed of 4.9 m/s on a level road can take a sharp circular turn of radius 4 m, then coefficient of friction between the cycle tyres and road is *
1 point
113. A boy carrying a box on his head is walking on a level road from one place to another on a staight road is doing no work. The statement is *
1 point
114. A body is allowed to slide down a frictionless track freely under gravity. The track ends in a semicircular shaped part of diameter D. What should be the height (minimum) from which the body must fall so that it completes the circle *
1 point
115. A body of mass 5 kg has momentum of 10 kg m/s. When a force of 0.2 N is applied on it for 10 seconds, what is the change in its kinetic energy? *
1 point
116. A particle is revolving in a circle of radius R. If the force acting on it is inversely proportional to R, then the time period is proportional to *
1 point
117. A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/s. It is subjected to a retarding force F = –0.1 x J/m during its travel from x = 20 m to x = 30 m. Its final kinetic energy will be *
1 point
118. A particle of mass m moves with constant speed along a circular path of radius r under the action of force F. Its speed is *
1 point
119. A bullet is fired from a rifle and the rifle recoils. Kinetic energy of rifle is *
1 point
120. A force F acting on an object varies with distance x as shown in the figure. 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 *
1 point
121. A body of mass 5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface collides with a nearly weightless spring of force constant k = 5 N/m. The maximum compression of the spring would be *
1 point
122. A body is moved along a straight line by a machine delivering constant power. The distance travelled by the body in time t is proportional to *
1 point
123. A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/s. It is subjected to a retarding force F = 0.1x joule/metre during its travel from x = 20 m to x = 30 m. Its final KE will be *
1 point
124. A ball of mass m is tied up with string and rotated along a horizontal circle of radius r. At an instant, its velocity is v, and tension in string is T, the force required for circular motion is *
1 point
 125. A weight w is suspended from the mid. point of a rope, whose ends are at the same level. In other to make the rope perfectly horizontal, the force applied to each of its ends must be *
1 point
126. Consider the situation shown in figure. A spring of spring constant 400 N/m is attached at one end to a wedge fixed rigidly with the horizontal part. A 40 g mass is released from rest while situated at a height 5  cm the curved track. The minimum deformation in the spring is nearly equal to (take g = 10 m/s2 ) *
1 point
127. The force on a particle as the function of displacement x (in x-direction) is given by F = 10 + 0.5x The work done corresponding to displacement of particle from x = 0 to x = 2 unit i *
1 point
128. The black body spectrum of an object O1 is such that its radiant intensity (i.e., intensity per unit wavelength interval) is maximum at a wavelength of 200 nm. Another object O2 has the maximum radiant intensity at 600 nm. The ratio of power emitted per unit area by source O1 to that of source O2 is *
1 point
Submit
Clear form
Never submit passwords through Google Forms.
This content is neither created nor endorsed by Google. - Terms of Service - Privacy Policy

Does this form look suspicious? Report