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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) [LT2]          

(b) L-1+

(c) LT-1

(d) L2T

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) [LT2]

(c) [L2T]

(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/s2       

(b) 9 m/s2

(c) 10 m/s2     

(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/s2

(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) [M2LT]       

(d) [ML2T]

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) Vi cos 0

(b) Vi sin  0

(c) Vi2 sin 0     

(d) Vi 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) ms2           

(b) m/s2

(c) m2s           

(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) Vx = Vi sin 0          

(b) VH = Vi COS 0

(c) Zero

(d) Vi

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) 900

(b) 1200

(c) 180

(d) 450

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

(a) Vi2/g

(b)  2Vi/g

(c) 2Vi2/g

(d) Vi2/2g

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) sin2 0

(c) cos2 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) 1200          

(b) 450

(c) 700

(d) 760

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 — ax2        

(b) Y = ax — bx2

(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) 300

(b) 450

(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 450 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