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__Chapter 3__

__Motion and Force__

**Encircle the most appropriate answer among the following options**

*1. If a body changes its position with respect to its surroundings then it is said to be in choose which one is correct:*

(a) Rest

**(b) Motion**

(c) Momentum

(d) Forcem

*2. when a body doesn’t change its position with respect to its surroundings then what will it is said to be at choose which one is correct:*

**(a) Rest **

(b) Motion

(c) Momentum

(d) Force

*3. The change in position of a body from initial to final position is called choose which one is correct:*

(a) Velocity

**(b) Displacement**

(c) Acceleration

(d) Speed

*4. The rate of change of displacement is called choose which one is correct: *

**(a) Velocity **

(b) Displacement

(c) Acceleration

(d) Speed

*5. The rate of change of distance is called choose which one is correct: *

(a) Velocity

(b) Displacement

(c) Acceleration

**(d) Speed**

*6. The SI unit of velocity is choose which one is correct: *

**(a) m/s **

(b) m-s

(c) s/m

(d) None of these

*7. The dimensions of velocity are choose which one is correct: *

(a) [LT^{2}]

(b) L^{-1+}

**(c) LT ^{-1}**

(d) L^{2}T

*8. The expression Limit —At represents choose which one is correct: *

(a) Average velocity

(b) Displacement

**(c) Instantaneous velocity **

(d) Acceleration

*9. If The velocity of the body is increasing then its acceleration will be choose which one is correct:*

(a) zero

(b) maximum

(c) positive

**(d) negative**

*10. The rate of change of velocity is known as*

(a) Displacement

(b) Velocity

(c) Speed

**(d) Acceleration**

*Il. When the velocity of a body is increases at constant rate, it is said to be moving with choose which one is correct:*

**(a) Constant velocity**

(b) Constant speed

(c) Constant displacement

(d) None of these

*12. With the help of velocity-time graph, we can find choose which one is correct:*

**(a) Distance **

(b) Time

(c) Velocity

(d) Momentum

*13. The area under the curve of velocity-time graph gives choose which one is correct:*

**(a) Acceleration **

(b) Velocity

(c) Distance

(d) Direction

*14. The motion and rest are choose which one is correct:*

**(a) Relative **

(b) Discrete

(c) Absolute

(d) None of these

*15. When a body moves in straight line, displacement is choose which one is correct:*

(a) Circular

(b) Curved

**(c) Along the path **

(d) None of these

*16. If the instantaneous velocity does not change, then the body is said to be moving with choose which one is correct:*

(a) Average velocity

(b) Average acceleration

**(c) Uniform velocity **

(d) Average speed

*17. A man on the top of a tower throws an object upward with a certain velocity and allows another object to fall freely. The two objects strikes the Earth with choose which one is correct:*

**(a) Different velocities **

(b) Same velocities

(c) Uniform velocities

(d) None of these

*18. If the velocity time graph becomes steeper and steeper then acceleration choose which one is correct:*

(a) Remains constant

(b) Decreases

**(c) Increases **

(d) None of these

*19. Acceleration of a body sliding down a smooth inclined plane of constant angle is said to be choose which one is correct:*

(a) Variable

(b) Increasing

(c) Decreasing

**(d) Constant**

*20. The dimensions of acceleration are choose which one is correct:*

(a) [LE^{-1}]

(b) [LT^{2}]

(c) [L^{2}T]

**(d) [LT ^{-2}]**

*21. Slope of velocity-time graph represents choose which one is correct:*

(a) Distance

(b) Displacement

**(c) Acceleration**

(d) None of these

*22. A paratrooper moves downward with choose which one is correct:*

**(a) Zero acceleration**

(b) Negative acceleration

(c) Positive acceleration

(d) Acceleration due to gravity

*23. If a body is moving with constant velocity of 20 m/s towards North then its acceleration is choose which one is correct:*

(a) 5 m/s^{2}

(b) 9 m/s^{2}

(c) 10 m/s^{2}

**(d) Zero**

*24. Acceleration in a body is always produced in the direction of choose which one is correct:*

**(a) Force **

(b) Velocity

(c) Weight

(d) None of these

*25. The velocity of a body at any instant of time is called choose which one is correct:*

(a) Average speed

(b) Uniform velocity

**(c) Instantaneous velocity **

(d) None of these

*26. The unit of acceleration in SI unit is choose which one is correct:*

(a) m/s

**(b) m/s ^{2}**

(c) m-s

(d) 1/m-s

*27. If a body covers equal displacement in equal interval of time then what will be velocity of the body among following*

**(a) Uniform **

(b) Average

(c) Instantaneous

(d) None of these

*28. If a body covers unequal displacement in unequal interval of time then what velocity of the body will be among following*

(a) Uniform

**(b) Variable**

(c) Instantaneous

(d) None of these

*29. The acceleration of a body at a particular instant of time is choose which one is correct:*

(a) Uniform acceleration

(b) Variable acceleration

**(c) Instantaneous acceleration **

(d) None of these

*30. Graphs which are used to describe the variation of velocity with time are called choose which one is correct:*

(a) Speed-time graph

**(b) Velocity-time graph**

(c) Distance-time graph

(d) None of these

*31. If a body is moving with constant acceleration then the velocity-time graph is choose which one is correct:*

(a) Parabola

(b) Hyperbola

**(c) Straight line **

(d) None of these

*32. In displacement-time graph, if the slope of line increases then choose which one is correct:*

(a) The acceleration increases

**(b) The velocity becomes greater**

(c) The speed decreases

(d) None of these

*33. The average and instantaneous accelerations will be equal when a body moves with choose which one is correct:*

**(a) Constant acceleration **

(b) Variable acceleration

(c) Retardation

(d) Positive acceleration

*34. A frame of reference at rest is called choose which one is correct:*

(a) Non-inertial frame

**(b) Inertial frame**

(c) Accelerated frame

(d) None of these

*35. Those frame of references which are moving with some acceleration is called choose which one is correct:*

**(a) Non-inertial frame **

(b) Inertial frame

(c) Both (a) and (b)

(d) None of these

*36. If V is the change in the velocity of a body during time t, then its acceleration is given by choose which one is correct:*

(a) a =

(b) a =

**(c) a =**

(d) a =

*37. The laws of motion shows the relation between choose which one is correct: *

(a) Distance and velocity

(b) Displacement and velocity

(c) Mass and velocity

**(d) Force and acceleration**

*38. The quantity of matter in a body is called choose which one is correct: *

(a) Force

**(b) Mass**

(c) Displacement

(d) Speed

*39. Newton’s first law of motion is also called choose which one is correct: *

**(a) Law of inertia **

(b) Law of momentum

(c) Ampere’s law

(d) None of these

*40. The property of a body due to which it opposes its state of rest or of motion is called choose which one is correct:*

(a) Momentum

(b) Torque

(c) Weight

**(d) Inertia**

*41. Laws of motion are valid in a frame which is choose which one is correct: *

(a) In motion

**(b) Inertial**

(c) Both (a) and (b)

(d) None of these

*42. Laws of motion are not valid in a frame which is choose which one is correct:*

(a) Inertial

**(b) Non-inertial**

(c) In the space

(d) None of these

*43. Newton’s laws are applicable on the objects which have choose which one is correct:*

(a) High speed and light mass

(b) Low speed and light mass

**(c) Low speed and heavy mass **

(d) None of these

*44. The magnitude of acceleration produced in an object is inversely proportional with choose which one is correct:*

(a) Momentum

(b) Velocity

**(c) Mass **

(d) Applied force

*45. The SI unit of force is choose which one is correct:*

**(a) Newton **

(b) Kilogram

(c) Joule

(d) Metre

*46. The force which produces an acceleration of I m/s in an object of mass I kg is equal to choose which one is correct:*

(a) One Ampere

(b) One Watt

**(c) One Newton **

(d) One Coulomb

*47. If the force acting on a body is doubled, then acceleration becomes choose which one is correct:*

(a) Half

(b) Constant

(c) One forth

**(d) Double**

*48. A mass of 10 kg moves with an acceleration of 10 m/s , the force on it is choose which one is correct:*

**(b) 100 N**

(c) 50 N

(d) 25 N

*49. Inertia of a body is measured in terms of its choose which one is correct: *

(a) Weight

(b) Force

**(c) Mass **

(d) Acceleration

*50. The rate of change of momentum is equal to choose which one is correct: *

**(a) Applied force **

(b) Torque

(c) Distance

(d) Time

*51. The product of mass and velocity is known as choose which one is correct:*

(a) Impulse

**(b) Momentum**

(c) Force

(d) Power

*52. The expression I = F x t represents choose which one is correct: *

(a) Momentum

**(b) Impulse**

(c) Force

(d) Power

*53. Impulse is equal to the choose which one is correct:*

**(a) Change in momentum **

(b) Change of force

(c) Change of time

(d) Change of velocity

*54. The dimensions of weight are choose which one is correct: *

(a) [LE^{-1} ]

**(b) [MLT ^{-2}]**

(c) [M^{2}LT]

(d) [ML^{2}T]

*55. SI unit of impulse is choose which one is correct:*

(a) kg m/s

**(c) NS**

(d) None of these

*56. The motion of the rocket in the space is according to the law of conservation of choose which one is correct:*

(a) Energy

(b) Mass

**(c) Linear momentum **

(d) None of these

*57. A force of 100 N acts in a body for 5 seconds, what will be the change among the following in momentum choose which one is correct:*

**(a) 20 N-s**

(b) 500 N-s

(c) 100 N-s

(d) 1000 N-s

*58. A body thrown upward making an angle with the horizontal and moving freely under the action of gravity is called choose which one is correct:*

(a) Linear motion

**(b) Projectile motion**

(c) Both (a) and (b)

(d) None of these

*59. The path followed by the projectile is called choose which one is correct: *

(a) Height of projectile

(b) Range of projectile

**(c) Trajectory**

(d) None of these

*60. During projectile motion, the horizontal component of velocity choose which one is correct:*

**(a) Remains constant **

(b) Increases

(c) Decreases

(d) Becomes zero

*61. The trajectory of a projectile is choose which one is correct:*

(a) Circle

**(b) Parabola**

(c) Hyperbola

(d) Straight line

*62. The vertical component of velocity at highest point during projectile motion is choose which one is correct:*

(a) Maximum

(b) Constant

**(c) Zero **

(d) Same

*63. A foot ball kicked in a air is the example of choose which one is correct:*

(a) Linear motion

(b) Circular motion

(c) Rotational motion

**(d) Projectile motion**

*64. The acceleration along x-direction in case of projectile is choose which one is correct:*

**(a) Zero **

(b) Equal to gravity

(c) Maximum

(d) Constant

*65. Motion of a projectile is choose which one is correct:*

(a) One dimension

**(b) Two dimension**

(c) Three dimension

(d) None of these

*66. Initial vertical velocity of a projectile is given by choose which one is correct:*

(a) V_{i} cos ~~0~~

**(b) V _{i} sin 0**

(c) V_{i}^{2} sin ~~0~~

(d) V_{i} tan ~~0~~

*67. The magnitude of the velocity of the projectile is choose which one is correct:*

**(a) V =**

(b)

(c)

(d) None of these

*68. The expression for maximum height is choose which one is correct: *

**(a) **

(b)

(c)

(d)

*69. The SI unit of acceleration is choose which one is correct: *

(a) ms^{2}

**(b) m/s ^{2}**

(c) m^{2}s

(d) None of these

*70. The horizontal component of velocity of a projectile thrown with initial velocity 300 m/s at an angle of 90 0 will be choose which one is correct:*

(a) 450 m/s

(b) 200

(c) 150 m/s

**(d) Zero**

*71. Height attained by the projectile will be maximum when the angle of projection is choose which one is correct:*

(a) 300

(b) 600

**(c) 450**

(d) 900

*72. Velocity of the projectile at the maximum height attained when projected with velocity Vi is choose which one is correct:*

(a) V_{x} = V_{i} sin ~~0~~

(b) V_{H} = V_{i} COS ~~0~~

**(c) Zero**

(d) V_{i}

*73. A body falling freely strikes the ground in 5 seconds, distance covered by it in 5 second is choose which one is correct:*

**(a) 122.5 m **

(b) 25 m

(c) 24.5 m

(d) 34.5 m

*74. The total time for which the projectile remains in air is known as choose which one is correct:*

(a) Time of projectile

(b) Time period

**(c) Time of flight **

(d) Time constant

*75. The time of flight is given by choose which one is correct:*

**(a)**

(b)

(c)

(d)

*76. The angle of projection to cover maximum horizontal range is choose which one is correct:*

(a) 90^{0}

(b) 120^{0}

(c) 18^{0}

**(d) 45 ^{0}**

*77. The expression for maximum range of projectile is given by choose which one is correct:*

**(a) Vi ^{2}/g**

(b) 2Vi/g

(c) 2Vi^{2}/g

(d) Vi^{2}/2g

*78. The path followed by the ballistic missile is called choose which one is correct:*

(a) Missile displacement

**(b) Ballistic trajectory**

(c) Missile acceleration

(d) Ballistic time

*79. The ballistic missiles are useful only for choose which one is correct:*

(a) Long range

(b) Vertical range

**(c) Short range **

(d) Normal range

*80 For long range, the missiles used are called choose which one is correct:*

(a) Long range missiles

(b) Normal missiles

**(c) Guided missiles **

(d) Rocket missiles

*81. An object can have a constant speed even its velocity is choose which one is correct:*

(a) Constant

**(b) Changing**

(c) Zero

(d) Maximum

*82. The system in which no external force acts called choose which one is correct:*

(a) Inertial system

**(b) Isolated system**

(c) Non-material system

(d) Thermal system

*83. When there is no loss of K.E and momentum then the collision is called choose which one is correct:*

**(a) Elastic collision **

(b) In-elastic collision

(c) Inertial collision

(d) None of these

*84. The ballistic trajectory is the path followed by choose which one is correct:*

(a) The powered guided missile

(b) An un-powered and guided missile

**(c) An un-powered and un-guided missile**

(d) None of these

*85. The range of projectile is directly proportional to the choose which one is correct:*

**(a) sin 2 0 **

(b) sin^{2} ~~0~~

(c) cos^{2} ~~0~~

(d) tan ^{2} ~~0~~

*86. The magnitude of vertical and horizontal range will be equal if angle of projection is choose which one is correct:*

(a) 120^{0}

(b) 45^{0}

(c) 70^{0}

**(d) 76 ^{0}**

*87. A rocket propulsion is based on the principle of choose which one is correct: *

(a) Law of conservation of mass

(b) Law of conservation of energy

**(c) Law of conservation of momentum **

(d) None of these

*88. The path of projectile is determined by choose which one is correct: *

(a) Magnetic field

**(b) Gravitational field**

(c) Electric field

(d) Electromagnetic field

*89. The equation of parabola is choose which one is correct: *

(a) y = bx — ax^{2}

**(b) Y = ax — bx ^{2}**

(c) Both (a) and (b)

(d) None of these

*90. In a projectile motion, the horizontal range R depends upon choose which one is correct:*

(a) Angle of projection

(b) Initial velocity

**(c) Both (a) and (b) **

(d) None of these

*91. The horizontal component of a projectile moving with initial velocity of 200 m/s at an angle of 600 to x-axis is choose which one is correct:*

**(a) 100 m/s **

(b) 250 m/s

(c) 50 m/s

(d) 200 m/s

*92. The velocity of projectile is maximum at choose which one is correct: *

**(a) Highest point **

(b) One forth of height

(c) Half of height

(d) Before striking the ground

*93. Horizontal range of projectile is choose which one is correct: *

**(a) Equal to height **

(b) One fourth of height

(c) One half of height

(d) Double of height

*94. A force of 15 N acts on a body of mass 5 kg for 5 sec. to a distance of 10 cm, the rate of change of momentum is choose which one is correct:*

(a) 75 N

(b) 45 N

**(c) 15 N **

(d) 30N

*95. A fighter plane is chasing another plane, when it opens fire its speed.*

(a) Increases

**(b) Decreases**

(c) Remains same

(d) It stops

*96. If the horizontal range of a projectile is four times its maximum height, the angle of projection is choose which one is correct:*

(a) 30^{0}

**(b) 45 ^{0}**

(c) sin^{-1}

(d) tan^{-1}

*97. A train covers the first half distance between two stations at a speed of 40 kmh- and the other half at 60 kmh-l then what will be its average speed among the following choose which one is correct:*

(a) 45 kmh^{-1}

**(b) 48 kmh ^{-1}**

(c) 40 kmh^{-1}

(d) None of these

*98. During the projectile motion, the horizontal component of velocity.*

(a) Changes with time

(b) Becomes zero

**(c) Remains constant **

(d) Increases with time

*99. A ball is projected at angle of 45*^{0}* to the horizontal. If the horizontal range is 20 m, the maximum height to which the ball rises is choose which one is correct:*

(a) 2.5 m

**(b) 5.0 m**

(c) 7.5 m

(d) 10 m

*100. Newton’s first law of motion gives definition of choose which one is correct: *

(a) Mass

**(b) Force **

(c) Acceleration

(d) Speed