LAWS OF MOTION LAWS OF MOTION OBJECTIVE TYPE
LAWS OF MOTION
LAWS OF MOTION OBJECTIVE TYPE QUESTIONS
LAWS OF MOTION 1. A force produces an acceleration of 1 ms² on an object of mass 1 kg. This force is defined as …. . 1) 1 dyne 2) 1 newton 3) 1 tesla 4) 1 poundal
LAWS OF MOTION 2. A mass m falls freely from rest. The linear momentum, after it has fallen through a height h is (g = acceleration due to gravity). . . 4) zero
LAWS OF MOTION 3. Which of the following statements is incorrect for action and reaction forces ? 1) These act on two different bodies 2) These are equal in magnitude but opposite in direction 3) These act on a single body 4) Action and reaction never balance each other
LAWS OF MOTION 4. A body is said to be in equilibrium if all the force acting on it. . . 1) Are in the same direction 2) Are equal in magnitude 3) Have zero resultant 4) Can be arranged in pair
LAWS OF MOTION 5. The quantity of motion of a body is best represented by. . . 1) Its mass 2) Its speed 3) Its velocity 4) Its linear momentum
LAWS OF MOTION 6. The behaviour of a body under zero resultant force is given by. . . 1) Newton’s third law of motion 2) Newton’s second law of motion 3) Newton’s first law of motion 4) Newton’s law of gravitation
LAWS OF MOTION 7. Which law of Newton is called the law of equilibrium? 1) Newton’s first law of motion 2) Newton’s second law of motion 3) Newton’s third law of motion 4) Newton’s law of gravitation
LAWS OF MOTION 8. You are thrown outer side when your car suddenly takes a turn. Which law of Newton is involved in this? 2) Second Law 1) Third Law 3) First Law 4) Law Of Gravitation
LAWS OF MOTION 9. Which of the following is the most significant law of motion given by Newton? 1) First law of motion 2) Second law of motion 3) Third law of motion 4) Zeroth law of motion
LAWS OF MOTION 10. In translatory motion, Newton's third law can be used to obtain. . . 1) Newton's first law 2) Law of conservation of momentum 3) law of conservation of mass 4) Law of conservation of kinetic energy
LAWS OF MOTION 11. A frame of reference is said to be inertial if. . . 1) Newton's laws of motion hold good 2) Newton's laws of motion do not hold good 3) The frame of reference accelerates 4) The frame of reference decelerates
LAWS OF MOTION 12. There are three Newton's laws of motion namely first, second and third laws. We can derive. . . 1) Second and third laws from the first law 2) Third and first laws from the second law 3) First and second laws from the third law 4) All the laws are independent of each other
LAWS OF MOTION 13. A bird is sitting in an air tight cage suspended from a spring balance. If the bird starts flying, then the reading of the balance will. . . 1) Becomes zero 2) Increase 3) Decrease 4) Remain unchanged
LAWS OF MOTION 14. Area under force-time graph and time axis indicates. . . 1) Displacement 2) Work done 3) Impulse 4) Linear momentum
LAWS OF MOTION 15. A man is standing on a spring balance platform. Reading of the spring balance is 60 kg weight. If man jumps out side platform, then the reading of the spring balance is. . . 1) First increases and then decreases to zero 2) Decreases 3) Increases 4) Remains same
LAWS OF MOTION 16. A man drops an apple in the lift. He finds that the apple remains stationary and does not fall. The lift is. . . 1) Going down with constant speed 2) Going up with constant speed 3) Going down with constant acceleration 4) Going up with constant acceleration
LAWS OF MOTION 17. A force produces an acceleration of a 1 in a body and the same force produces an acceleration of a 2 in another body. If the two bodies are combined and the same force is applied on the combination, the acceleration produced in it is. . .
LAWS OF MOTION
LAWS OF MOTION 19. A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happen to the ball? 1) It will continue to move with same velocity along the original orbit of spacecraft 4) It will go very far in space
LAWS OF MOTION 20. Inside a railway car a plumb bob is suspended from the roof and a helium filled balloon is tied by a string to the floor of the car. When the railway car accelerates to the right, then. . . 1) both the plumb bob and balloon move to the left 2) both the plumb bob and balloon move to the right 4) plumb bob moves to the right and the balloon moves to the left
LAWS OF MOTION 21. The propulsion of a rocket is based on the principle of conservation of. . . 1) Linear momentum 2) Energy 3) Angular momentum 4) Mass
LAWS OF MOTION 22. A train is moving with acceleration along a straight line with respect to ground. A person in the train finds that. . 1) Newton's 2 nd law is false but newtons 3 rd law is true 2) Newton's 3 rd law is false but newtons 2 nd law is true 3) All the three newtons laws are false but can apply 2 nd law by considering a pseudo force 4) All the three Newton's laws are true.
LAWS OF MOTION 23. A man is standing in the middle of a perfectly smooth ‘island of ice’ where there is no friction between the ground and his feet. Under these circumstances. . 1) He can reach the desired corner by throwing any object in the same direction 2) He can reach the desired corner by throwing any object in the opposite direction 3) He has no chance of reaching any corner of the island 4) He can reach the desired corner by pursuing on the ground in that direct
LAWS OF MOTION 24. A student initially at rest on a frictionless frozen pond throws a 2 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation. . . 1) The hammer will have the momentum with greater magnitude 2) The student will have the momentum with greater magnitude 3) The hammer will have the greater kinetic energy 4) The student will have the greater kinetic energy
LAWS OF MOTION 25. You hold a rubber ball in your hand. The Newton’s third law companion force to the force of gravity on the ball is the force exerted by the. . . 1) Ball on the earth 2) Ball on the hand 3) Hand on the ball 4) Earth on the ball
LAWS OF MOTION 26. The change in momentum per unit time of a body represents. . . 1) Impulse 2) Force 3) Kinetic energy 4) Resultant force
LAWS OF MOTION 27. While we catch a cricket ball, we catch it at the front and make the hands move with the ball backwards. Why is that? 1) To reduce the impulse 2) To increase the time of contact, there by increase the force 3) To increase the impulse 4) To increase the time of contact, there by decrease the force
LAWS OF MOTION 28. A lift is going up with uniform velocity. When brakes are applied, it slows down. A person in that lift, experiences. . . 1) More weight 2) Less weight 3) Normal weight 4) Zero weight
LAWS OF MOTION 29. A ball falls towards the earth. Which of the following is correct? 1) If the system contains ball, the momentum is conserved 2) If the system contains earth, the momentum is conserved 3) If the system contains the ball and the earth, the momentum is conserved 4) If the system contains the ball and the earth and the sun, the momentum is conserved
LAWS OF MOTION 30. Frictional force between two surface in contact is due to. . . 1) Adhesive forces between the molecules 2) Cohesive forces between the molecules 3) Repulsive forces between the molecules 4) Both 2 and 3
LAWS OF MOTION 31. Friction is always. . 1) Opposes the motion of the body 2) Perpendicular to the surface of contact 3) Tangential to the surface of contact 4) Inclined to the surface of contact
LAWS OF MOTION 32. Frictional force between two bodies. . 1) Aids motion between the bodies 2) Opposes relative motion between the bodies 3) Sometimes helps and sometimes opposes the motion of body 4) Both 2 and 3
LAWS OF MOTION 33. With increase of temperature, friction 1) Increases 2) Decreases 3) Remains unchanged 4) May increase or decrease
LAWS OF MOTION 34. A body lies on a table. Its weight is balanced by the. . 1) Frictional force 2) Normal force 3) Force causes motion on the body 4) Surface of the table
LAWS OF MOTION 35. Frictional force is. . . 1) Conservative 2) Non conservative 3) Always constant in magnitude 4) Always zero
LAWS OF MOTION 36. Rolling friction is. . . 1) equal to static friction 2) greater than static friction 3) less than static friction 4) zero
LAWS OF MOTION 37. A car is moving on a rough road with uniform speed. This means. . 1) No external force is applied to move the car 2) No frictional force is acting on the car 3) External force causing the motion is equal to frictional force 4) Frictional force is greater than the external force applied
LAWS OF MOTION 38. A body rests on a rough horizontal surface and no external force is applied on it. Then. . . 1) Static friction acting on it keeps it in equilibrium 2) Frictional forces act in all directions between the surfaces in contact which keep it in equilibrium 3) No frictional force is acting on it 4) Its weight is balanced by static friction
LAWS OF MOTION 39. A car and a truck use similar tyres. If they are moving at the same initial speed, the minimum stopping distance. . . 1) Is smaller for the car 2) Is smaller for the truck 3) Is the same for both 4) Depends on colour of the truck or car
LAWS OF MOTION 40. By applying sufficient external force a body is made to move and the same force is continued. Then the body moves with. . . 1) Uniform velocity 2) Uniform acceleration 3) Uniform retardation 4) Zero acceleration
LAWS OF MOTION 41. A body is placed on a rough horizontal surface. When the applied force and the maximum frictional force are equal and opposite the frictional force is called. . . 1) Rolling friction 3) Limiting friction 2) Sliding friction 4) Air friction
LAWS OF MOTION 42. The limiting friction between two surfaces depends. . . 1) On the nature of two surfaces 2) Proportional to normal reaction 3) Independent of area of surface 4) All the above
LAWS OF MOTION 43. Iron rails are dusted with sand during rainy season to. . . . 1) Make it always wet 2) Increase friction 3) Reduce friction 4) Stop the train
LAWS OF MOTION 44. Is it preferable to use small brakes or large brakes for a car? 1) Small brakes 2) Large brakes 3) Both are equally effective as friction 4) None of these
LAWS OF MOTION 45. When a bicycle is in motion and pedaled, the force of friction exerted by ground on the two wheels is such that it acts? 1) In the backward direction on the front wheel and in the forward direction on the rear wheel 2) In the forward direction on the front wheel and in the backward direction on the rear wheel 3) In the backward direction on both the front and the rear wheels 4) In the forward direction on both the front and rear wheels
LAWS OF MOTION 46. A body moves on a horizontal rough surface with acceleration ‘a’ when it is subjected to a horizontal force. If the applied force is doubled, it moves with acceleration. . . 1) Equal to 2 a 2) Less than 2 a 3) Greater than 2 a 4) Equal to a
LAWS OF MOTION 47. Which of the following is wrong. . 1) Using ball bearings, sliding friction changes to rolling friction 2) Lubricants decrease friction since inter molecular forces are weak in liquids 3) Over polishing increases friction since molecules come closer 4) None
LAWS OF MOTION 48. The tangent of angle made by the resultant of limiting friction and normal reaction with the normal reaction gives. . . . 1) Kinetic friction 2) Static friction 3) Coefficient of kinetic friction 4) Coefficient of static friction
LAWS OF MOTION 49. If the external force applied in the horizontal direction on a block which is on a table is balanced by the frictional force. Then such friction is called. . . . 1) Maximum friction 2) Sliding friction 3) Static friction 4) Rolling friction
LAWS OF MOTION 50. Pulling of lawn roller is easier than pushing because. . . . 1) Weight of the roller gets decreased when it is pulled 2) Vertical component of the pulling force acts downwards and there by decreases the frictional force during pulling 3) The vertical component of the pulling force acts upwards and there by decreases the frictional force during pulling 4)The frictional force acts in the direction of motion of the roller and there by making the pulling easier
LAWS OF MOTION 51. When the body is ready to slide down on inclind plane then angle of repose is? 1) Greater than angle of friction 2) Less than angle of friction 3) Equal to angle of friction 4) Equal to half of the angle of friction
LAWS OF MOTION 52. The friction between two surfaces in contact is independent of. . . . 1) Nature of surfaces in contact 2) Area of surfaces in contact 3) Normal reaction between the surfaces 4) All the above
LAWS OF MOTION 53. A block 'B' rests on 'A'. A rests on a horizontal surface 'C' which is frictionless. There is friction between A and B. If 'B' is pulled to the right with force P (If P is less than frictional force between A and B). . . . 1) B moves forward and A to the left 2) 'B' only moves to the left 3) 'B' does not move 4) 'A' and 'B' move to together to the right
LAWS OF MOTION 54. When a moving body is suddenly stopped. . . . 1) Frictional force increases 2) Roughness is found on the road 3) Tyres of the vehicle burst 4) The frictional force reduces to zero as it is a self adjusting force
LAWS OF MOTION
LAWS OF MOTION 56. Coefficient of static friction depends on. . . . 1) Normal reaction 2) Nature of the surface in contact 3) Both normal reaction and nature of the surfaces in contact 4) None of these
LAWS OF MOTION 57. The force of friction that comes into action after the motion has started is known as. . . . 1) Limiting friction 2) Static friction 3) Dynamic friction 4) None of these
LAWS OF MOTION 58. The coefficient of static friction is. . . . 1) Always negative 2) Always greater than one 3) Always less than one 4) Usually less than one
LAWS OF MOTION 59. If the normal force is doubled, frictional force is. . . . 1) Halved 2) Doubled 3) Not changed 4) Zero
LAWS OF MOTION 60. If the normal force is doubled, coefficient of friction is. . . . 1) Halved 2) Doubled 3) Not changed 4) Zero
LAWS OF MOTION 61. A good lubricant must be. . . . 1) highly viscous 2) low viscous 3) volatile in nature 4) highly viscous and low volatile in nature
LAWS OF MOTION 62. The rolling frictional force varies. . . . 1) Inversely as the radius of the roller 2) Directly as the radius of the roller 3) Inversely as the magnitude of rolling frictional coefficient 4) Directly as the magnitude of rolling frictional coefficient
LAWS OF MOTION 63. Circular wheels are preferable than square wheels. The reason for this is. . . . 1) Rolling friction is greater than kinetic friction 2) Rolling friction is smaller than kinetic friction 3) Rolling friction is equal to kinetic friction 4) Circular wheels are cheaper
LAWS OF MOTION 64. When a person is walking towards north on a rough horizontal road, the direction of friction acting on his feet is. . . . 2) Towards south 1) Towards north 3) Towards east 4) Towards west
LAWS OF MOTION
LAWS OF MOTION 66. Dimensional formula of coefficient of friction is. . . . 4) None
LAWS OF MOTION 67. A horse has to pull a cart harder during the start than later. The reason for this is. . . . 1) Limiting friction is greater than kinetic friction 2) Static friction is greater than kinetic friction 3) Horse has four legs 4) Static friction is less than kinetic friction
LAWS OF MOTION 68. While walking on ice one should take small steps to avoid slipping. Here smaller steps ensure. . . . 1) Larger friction 3) Larger normal reaction 2) Smaller friction 4) Smaller normal reaction
LAWS OF MOTION 4) None of these
LAWS OF MOTION 70. Two vehicles of same model and structure ‘P’ and ‘Q’ are moving on the same road. The area of contact of the tyres of the vehicle ‘P’ is twice that of ‘Q’. Then the frictional force between the tyres of ‘A’ is 1) Depends on the H. P. of the engines 2) Same that of ‘Q’ 3) Half that of ‘Q’ 4) Twice that of ‘Q’
LAWS OF MOTION 71. A man is at rest in the middle of a pond on perfectly smooth ice block. He can get himself to the store 1) by praying to god 2) by sneezing or coughing 3) by jumping vertically up 4) none of these
LAWS OF MOTION 1) More than the limiting angle of friction 2) Less than the limiting angle of friction 4) Equal to zero
LAWS OF MOTION 4) The system can not remain in equilibrium
LAWS OF MOTION 74. A block is just supported at the front surface of a vehicle moving with acceleration. That acceleration is. . . . 1) Directly proportional to the mass of the body 2) Inversely proportional to the coefficient of friction 3) Directly proportional to the square of the acceleration due to gravity 4) None of the above
LAWS OF MOTION 75. The angle which the rough inclined plane makes with the horizontal when the body placed on it just starts sliding down is called 1) angle of friction 2) angle of repose 3) critical angle 4) none of these
LAWS OF MOTION 1) Mass of X = mass of Y 2) Mass of X < mass of Y 3) Mass of X > mass of Y 4) All the three are possible
LAWS OF MOTION 77. A block “A” slides down a smooth inclined plane when released from the top while another block ‘B’ falls freely from the same point. Then. . . . 1) A & B reach the ground with the same velocity simultaneously 2) A & B reach the ground with different velocity 3) A reaches earlier than B 4) B reaches earlier than A
LAWS OF MOTION
LAWS OF MOTION 79. Statement I : When a bus starts suddenly, a person standing in ; it falls back wards Statement II : It is due to inertia of rest 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 80. Statement I : According to Newton’s third law sum of action and reaction is not equal to zero Statement II : The forces action and reaction acts on different bodies 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 81. Statement I : When a stone is suspended at the end of a string, the tension in the string is equal to weight of the stone and the stone is in equilibrium Statement II : Action - reaction forces balance each other on the stone. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 82. Statement I : If a horse tied to a cart, pulls the cart, the cart also pulls the cart with an equal and opposite force. Statement II : The coupling force between the horse and the cart must be zero. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 83. Statement I : If the momenta of two bodies are equal, the lighter body must have larger velocity Statement II : The product of mass and velocity is defined as the momentum. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 84. Statement I : Shock absorbers in vehicles reduce the magnitude of the shocking force by increasing the reaction time. Statement II : The product of the force and the interval of time gives the impulse 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 85. Statement I : In a free fall, weight of a body becomes effectively zero. Statement II : Acceleration due to gravity acting on a body having free fall is zero. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 86. Statement I : Newton's second law of motion is the main law of motion. Statement II : Newton's third and first laws derived from the second law. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 87. Statement I : Mass is a measure of inertia of the body in linear motion. Statement II : Greater the mass, greater is the force required to change its state of rest or of uniform motion. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION Statement II : For a given force and displacement. Velocity is always inversely proportional to root of mass. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 89. Statement I: Greater is the rate of the change in the momentum vector, the greater is the force applied. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 90. Statement I : The acceleration of a particle as seen from an inertial frame is zero. Statement II : No force is acting on the particle. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 91. Statement I: Acceleration of a body can change its direction without any change in direction of velocity. Statement II : Direction of acceleration is same as that of direction of change in velocity vector. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 92. Statement I: The free body diagram of a body shows all the forces acting on and acting by that body. Statement II: The body is represented by a point mass in a free body diagram. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 93. Statement I: A body may be in equilibrium under the action of certain forces. Statement II: For equilibrium, it is not necessary that the resultant force is zero 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 94. Statement I: Rate of change of linear momentum is equal to external force. Statement II: There is equal and opposite reaction to every action. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 95. Statement I: The third law of motion concludes that forces occur in pairs of action and reaction. Statement II: The action force is more than the reaction force. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 96. Statement I: A reference frame attached to earth is non-inertial. Statement II: Since the earth undergoes rotation and revolution, frame can not be inertial 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 97. Statement I: When you are going upwards with some acceleration in a elevator your measured weight will be more than your actual weight. Statement II: Normal force on you will be more than your weight in any elevator. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 98. Statement I: The slope of momentum verses time graph gives the acceleration. Statement II: Acceleration is given by the rate of change of velocity. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 99. Statement I: If the direction and magnitude of a force is constant, it is said to be a constant force. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 100. Statement I: If two frames S and S' moving with uniform velocity v and v' respectively then their relative acceleration is zero. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 101. Statement I: A block of mass m is placed on a fixed smooth inclined plane of inclination with the horizontal. The force exerted by the plane on the block has a magnitude mg cos��. Statement II: Normal reaction always acts perpendicular to the contact surface 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 102. Statement I: Newton’s first law is violated in a non inertial frame of reference. Statement II: This is because the presence of psuedo or imaginary forces in this frame 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 103. Statement I: A block of mass 10 kg when suspended by two light spring balances in series shows 5 kg in both. Statement II : The tension in the springs are same. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 104. Imagine a situation in which body of mass is placed on ground (contact force is N) Statement I: : mg and N are not action-reaction forces. Statement II : mg and N act on same body. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 105. Statement I: When stationary bomb explodes into two pieces their speeds are in the inverse ratio of their massess. Statement II: Explosion does not violate Law of conservation of linear momentum. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 106. Statement I: Friction helps the motion of a body on a rough surface. Statement I: Frictional force is electro magnetic in nature 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 107. Statement I: When a bicycle is being pedalled, the friction on the front wheel is in a direction opposite to the motion of bicycle. Statement II: The rear wheel while being pedalled, pushes the front wheel on rough road due to which the friction opposes the relative motion. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 108. Statement I: It is easier to pull a lawn roller than to push on the same horizontal rough surface Statement II: Pulling decreases normal reaction 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 109. Statement I: A person walks on a rough surface. Statement II: Reaction of the force applied by the man on the surface keeps him moving 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 110. Statement I: An object projected with same velocity on the paths of different rough surfaces are brought to rest in different distances. Statement II: The workdone against the friction depends on the path travelled by the object. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 111. Statement I: On polishing the surface the friction decreases upto certain limit but increases beyond that. Statement II: On polishing the surface, the irregularities are cut off. 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 112. Statement I: The friction gives the necessary certripetal force at the unbanked curved path. Statement II: Below the maximum safe velocity friction has self adjusting nature 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 113. Statement I: On the rough horizontal surface if the external force is doubled then the acceleration also becomes doubled. Statement II: A part of external force applied on the body moving with acceleration is used to overcome the friction. 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 114. Statement I: An object placed on the rotating horizontal table may fly off at lower angular velocity when placed far away from the axis. Statement II: : An object placed at the edge of the rotating table experiences more centrifugal force than at nearer position 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 115. Statement I: A bus is moving with constant speed on a rough horizontal surface. It gains KE, when some passengers get down from the bus. Statement II: Friction depends on normal reaction which in turn depends on mass 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 116. Statement I: frictional forces are conservation forces Statement II: Potential energy can be associated with frictional forces. 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 117. Statement I: On a rainy day, it is difficult to drive a car or bus at high speed. Statement II: The value of coefficient of friction is lowered due to wetting of the surface. 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 118. Statement I: The proper inflation of tyres saves fuel Statement II: Rolling friction decreases due to the decrease in area of contact with the road. 1) Statement I is true, statement II is the correct explanation for statement I 2) Statement I is true, statement II is not the correct explanation for statement I 3) Statement I is true, statement II is false 4) Statement I is false, statement II is true
LAWS OF MOTION 119. Statement I: More force is required to push a body up a rough inclined plane than that to move the same body down the same plane. Statement II: The friction always acts parallel to inclined plane down wards. 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 120. Statement I: The time of ascent for a body projected to move up a rough inclined plane is less than the time of descent. Statement II: The retardation for upward motion is more than the acceleration for down motion 1) Statement I is true, Statement II is true, statement II is the correct explanation for statement I 2) Statement I is true, Statement II is true, statement II is not the correct explanation for statement I 3) Statement I is true, Statement II is false 4) Statement I is false, Statement II is true
LAWS OF MOTION 121. A reference frame attached to the earth a) Is an inertial frame by definition b) Can not be an inertial frame because the earth is revolving around the sun c) Is an inertial frame because Newton's laws are applicable in this frame d) Cannot be an inertial frame because the earth is rotating about its axis 1) a, b, c are correct 2) b only correct 3) b and d are correct 4) All are correct
LAWS OF MOTION 122. Regarding linear momentum of a body. a. It is a measure of quantity of motion contained by the body b. Change in momentum is the measure of impulse c. Impulse and acceleration act in opposite direction to the change in momentum d. In the case of uniform circular motion the linear momentum is conserved. 1) a& b are true 2) b & c are true 3) c & d are true 4) a , b & c are true
LAWS OF MOTION 123. Consider the following statements 'a' and 'b' and identify the correct choice in the given answer a) For a body resting on a rough horizontal, it is easier to pull at an angle than to push at the same angle to cause motion. b) A body sliding down a rough inclined plane of inclination equal to angle of friction has non zero acceleration. 1) a& b are true 2) b & c are true 3) c & d are true 4) a , b & c are true
LAWS OF MOTION 124. Read the following two statements and then identify the correct choice of the given answers. A : The frictional force acting on a body of mass m which is at rest on a horizontal surface of coefficient of static friction is mg in the absence of external force. R : The frictional force acting on a body of mass m which is at rest on a rough inclined surface of angle of inclination ‘�� ’ is mg sin ��. 1) A is true and B is false 2) A is false and B is true 3) Both A and B are true 4) Both A and B are false
LAWS OF MOTION 125. Match the following List -I a) Weight lessness b) Rocket propulsion c) Change in momentum d) Newton's first law 1) a-g; b-e; c-h; d-f 2) a-h; b-e; c-f; d-g 3) a-e; b-h; c-g; d-f 4) a-f; b-g; c-h; d-e List - II e) Conservation of momentum f) Impulse g) Inertial frame h) Non-inertial frame
LAWS OF MOTION 126. A man of mass stands on a weighing machine in a lift List -I List - II reading of machine e) mg Lift moves a) up with uniform acceleration a f) m(g+a) b) down with uniform acceleration ‘a’ g) m(g-a) c) down with uniform velocity h) 0 d) freely falling lift 1) a-f; b-g; c-e; d-h 2) a-g; b-f; c-h; d-e 3) a-g; b-e; c-f; d-h 4) a-f; b-g; c-h; d-e
LAWS OF MOTION 127. Match the following List -I a) Force-velocity graph b) Velocity - time graph c) Power-time graph d) Force-time graph 1) a-g, b-h, c-f, d-e 3) a-f; b-e; c-g; d-h List - II e) Impulse f) Work done g) Power h) Distance travelled 2) a-h; b-f; c-e; d-g 4) a-e; b-g; c-h; d-f
LAWS OF MOTION 128. Match the following List -I a) Frictional force b) Rolling friction c) Ball bearing d) Excessive List - II e) Reduction of friction f) Adhesive force g) Deformation at the point of contact h) Increase of friction polishing i) Conservative force 1) a-i; b-e; c-h; d-f 2) a-f; b-f; c-e; d-g 3) a-f; b-g; c-e; d-h 4) a-i; b-f; c-h; d-e
LAWS OF MOTION 129. Match the items mentioned in the lists I and II below List - II List -I e) constant for a given pair of surfaces a) Static friction f) Independent of area of contact b) Limiting friction g) Self adjusting c) Kinetic friction h) Has the least magnitude for a given normal d) Rolling friction reaction 1) a-e; b-f; c-g; d-h 3) a-g; b-e; c-f; d-h 2) a-h; b-f; c-e; d-g 4) a-g; b-h; c-f; d-e
LAWS OF MOTION 130. Matching block type List - II List -I a) Frictional force e) zero b) Gravitational force f) Electro magentic force c) When a body on a rough inclined plane is just ready to move, then the net force acting on the body h) conservative force d) The force acting on a body placed on smooth inclined plane 1) a-h; b-f; c-g; d-e 2) a-f; b-h; c-e; d-g 3) a-e; b-g; c-f; d-h 4) a-g; b-e; c-h; d-f
LAWS OF MOTION Thank you…
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