FSc ICS MCAT ECAT Physics First Year Chapter 3 Motion and Force Multiple Choice Question (MCQ) Notes

FSc ICS MCAT ECAT Physics First Year Chapter 3 Motion and Force Multiple Choice Question (MCQ) Notes

Both Bold and Underlined option is correct

1. With the help of velocity-time graph, we can find:

• Distance
• Time
• Velocity
• Momentum

2. The area under the curve of velocity-time graph gives:

• Acceleration
• Velocity
• Distance
• Direction

3. If a body is moving with constant velocity of 20 m/s towards North then its acceleration is"

• 5 m/s(2)
• 9 m/s(2)
• 10 m/s(2)
• Zero

4. The laws of motion shows the relation between:

• Distance and velocity
• Displacement and velocity
• Mass and velocity
• Force and acceleration

5. Inertia of a body is measured in terms of its:

• Weight
• Force
• Mass
• Acceleration

6. A force of 100 N acts on a body for 5 seconds, what will be the change in momentum:

• 20 Ns
• 500 Ns
• 100 Ns
• 1000 Ns

7. Velocity of the projectile at the maximum height attained when projected with velocity vi is:

• vx = vi sinθ
• vh = vi cosθ
• Zero
• vi

8. A body is falling freely strikes the ground in 5 seconds, distance covered by it in 5 second is:

• 122.5 m
• 25 m
• 24.5 m
• 34.5 m

9. The total time for which the projectile remains in air is called:

• Time of projectile
• Time period
• Time of flight
• Time constant

10. The angle of projection to cover maximum horizontal range is:

• 90
• 120
• 18
• 45

11. The ballistic missiles are useful only for:

• Long range
• Vertical range
• Short range
• Normal range

12. When there is no loss of K.E and momentum then the collision is called:

• Elastic collision
• In-elastic collision
• Inertial collision
• None of these

13. The horizontal component of a projectile moving with initial velocity 200 m/s at an angle of 60 to x-axis is:

• 100 m/s
• 250 m/s
• 50 m/s
• 200 m/s

14. A ball is dropped from a height of 4.2 meters. To what height will it rise of there is no loss of K.E. after rebounding?

• 4.2 m
• 8.4 m
• 12.6 m
• None of these

15. The dimension of linear inertia is:

• MLT(2)
• ML(0)T(-2)
• ML(0)T(0)
• MLT(-1)

16. A body of mass 5 kg is acted upon by a constant force of 20 N for 7 seconds. The total change in momentum will be:

• 10 Ns
• 100 Ns
• 140 Ns
• 200 Ns

17. The magnitude of the force producing an acceleration of 10 m/s(2) in a body of mass 0.5 kg is:

• 3 N
• 4 N
• 5 N
• 6 N

18. A certain force gives an acceleration of 4m/s(2) to a body of mass 10 kg. The same force would give a 20 kg object an acceleration of:

• 0.5 m/s(2)
• 2.0 m/s(2)
• 1.5 m/s(2)
• 9.8 m/s(2)

19. One newton is a force that produces an acceleration of 5 m/s(2) in a body of mass:

• 0.2 kg
• 3 kg
• 4 kg
• 8 kg

20. A body is thrown vertically upward with initial velocity of 19.6 m/s. It will reach the height of:

• 49.2 m
• 29.4 m
• 9.8 m
• 4.9 m

21. If the acceleration of a body is negative, then slope of the velocity-time graph will be:

• Zero
• Positive
• Negative
• Infinity

22. Acceleration of 2.5 m/s(2) expressed in km/hr(2) is:

• 324
• 5.4
• 5400
• 32400

23. A body starting from rest covers a distance of 45 km and acquires a velocity of 100 km/hr. Its acceleration will be:

• 0.092 m/s(2)
• 0.8 m/s(2)
• 7.71 m/s(2)
• 0.15 m/s(2)

24. A force of 50 N acts on a body for 0.01 sec and changes its velocity from 5 m/s to 10 m/s/. The amount of impulse will be:

• 100 Ns
• 250 Ns
• 10 Ns
• 5 Ns

25. Two fast moving vehicles suffer head-on collision with a force of 1000 N for an interval of 10(-1) seconds. The impulse is:

• 10(-1) Ns
• 1 Ns
• 10(-3) Ns
• 10(5) Ns

26. Range of the projectile is the same for the following pair of angles:

• 0 and 45
• 35 and 55
• 15 and 60
• 30 and 75

27. A body is moving with a velocity v in the east direction. If it travels with the same velocity in the north direction, then resultant velocity is:

• v
• 2v
• v/√(2)
• √(2v)

28. If displacement of a particle is zero, the distance covered:

• must be zero
• may or may not be zero
• cannot be zero
• depends upon the particle

29. A body moves 4 m towards east and then 3 m north. The displacement and distance covered by the body are:

• 7m, 6m
• 6m, 5m
• 5m, 7m
• 4m, 3m

30. A moving body is covering the distance directly proportional to the square of the time. The acceleration of the body is:

• Increasing
• Decreasing
• Zero
• Constant

31. A body covered a distance of 5 m along a semicircular path. The ratio of distance to displacement is:

• 11 : 7
• 12 : 5
• 8 : 3
• 7 : 5

32. Which of the following changes when a particle is moving with uniform velocity:

• Speed
• Velocity
• Acceleration
• Position vector

33. If R is the maximum horizontal range of a particle, then the greatest height attained by it is:

• R
• 2R
• R / 2
• R / 4

34. A stone is just released from the window of a train moving along a horizontal straight track. The stone will hit the ground following a:

• Straight line path
• Circular path
• Parabolic path
• Hyperbolic path

35. If the time of flight of a projectile is doubled, what happens to the maximum height attained?

• Halved
• Remains unchanged
• Doubled
• Becomes four times

36. A 10 N force is applied on a body which produces in it an acceleration of 1 m/s(2). The mass of the body is:

• 10 kg
• 5 kg
• 15 kg
• 20 kg

37. Which of the following change when a particle is moving with uniform velocity:

• Speed
• Velocity
• Acceleration
• Position vector

38. The numerical ratio of velocity to speed is:

• Less than 1
• Less than 0
• Greater than 1
• Either less than or equal to one

39. A moving particle finally comes to rest. What will be the angle between acceleration and displacement during motion?

• π / 2
• π / 4
• π
• 0

40. The gradient of the velocity time graph represents:

• Speed
• Acceleration
• Distance
• Velocity

41. A body of 2 kg moves with an acceleration of 20 m/s. Its rate of change of momentum is:

• 10 kgm/s(2)
• 20 kgm/s(2)
• 40 kgm/s(2)
• 400 kgm/s(2)

42. A bullet of mass 'm' is fired with a velocity V into a block mass M and sticks to it. The final velocity of the system is:

• mV / M
• mV / (m + M)
• MV / m
• (m+M)V / m

43. A projectile is thrown at an angle of 45 with horizontal. If K is the K.E with which the projectile was thrown, then the K.E at the top of the trajectory is:

• 2K
• 4K
• K / 2
• K / 4

44. At the top of the trajectory of a projectile, the direction of its velocity and acceleration and:

• Perpendicular to each other
• Parallel to each other
• Inclined at an angle 45 of to the horizontal
• None of the above is correct

45. A ball weight 0.5 N is thrown vertically upward. The ball returns to the ground in 4s, then the impulse of the ball is:

• 1 Ns
• 2 Ns
• 4 Ns
• 20 Ns

46. If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the up thrust acting on the rocket is:

• mv
• mv / M
• Mv / m
• Mmv

47. A projectile will cover same horizontal distance when the initial angles of projection are:

• 20, 60
• 20, 50
• 20, 40
• 20, 70

48. At what angle with horizontal should a ball be thrown so that its range R is related to the time of flight as R = 5 T(2) (Take g = 10 m/s(2))

• 30
• 45
• 60
• 90

49. During projectile motion, the quantities that remains unchanged are:

• Force and vertical velocity
• Acceleration and horizontal velocity
• Kinetic energy and acceleration
• Acceleration and momentum

50. A trolley runs down a slope from rest with constant acceleration. In the first second, it travels 1.6 m. its acceleration is:

• 0.8 m/s(2)
• 1.6 m/s(2)
• 3.2 m/s(2)
• 6.4 m/s(2)

51. There are three Newton's laws of motion. We can drive:

• Second and third from first law
• Third and first laws from second
• First and second from third law
• All laws are independent of each other

52. A shell in flight explodes into four unequal parts. Which of the following is given by:

• Momentum and K.E
• Momentum and total energy
• K.E
• Neither momentum nor K.E

53. The acceleration of a body sliding down a smooth inclined plane is given by:

• g sinθ
• μ cosθ
• g(sinθ + μ cosθ)
• g(sinθ - μ cosθ)

54. The string of a vibrating pendulum is cut when it is at extreme position. The bob will follow a:

• Vertical path
• Horizontal path
• Parabolic path
• Circular path

55. The numerical value of the ratio of displacement to distance is:

• Always less than one
• Always equal to one
• Always more than one
• Equal to or less than one

56. Two bodies are projected at angle 'angle' and (90-angle) to the horizontal with the same speed the ratio of their times of flight T1 / T2 is:

• 1 : 1
• 1 : tanθ
• tanθ : 1
• None of these

57. The magnitude of a average velocity is equal to the average speed when a particle moves:

• on a curve path
• in the same direction
• with constant acceleration
• with constant retardation

58. A body is imparted motion from rest to move in a straight line. It is then obstructed by an opposite force, then:

• the body may necessarily change direction
• the body is sure to slow down
• the body will necessarily continue to move in the same direction at the same speed
• none of the above

59. The distance traveled by a body falling freely from rest in the first, second and third seconds are in the ratio:

• 1 : 2 : 3
• 1 : 3 : 5
• 1 : 4 : 9
• None of these

60. Which of the following four statements is false?

• A body can have zero velocity and still be accelerated
• A body can have a constant velocity and still have a varying speed
• A body can have a constant speed and still have a varying velocity
• The direction of the velocity of a body can change when its acceleration is constant

61. If an iron ball and a wooden ball of the same radius are released from a height h in a vacuum, then time taken by both of them to reach ground will be:

• Unequal
• Exactly equal
• Roughly equal
• Zero

62. The angle between instantaneous displacement and acceleration during the retarded motion is:

• 180
• 40
• 45
• 0

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

• Increases
• Decreases
• Remains same
• It stops

64. During the projectile motion, the horizontal component of velocity.

• Changes with time
• Becomes zero
• Remains constant
• Increase with time

65. Newton's first law of motion gives definition of:

• Mass
• Force
• Acceleration
• Speed

66. The acceleration of projectile at the highest point is:

• Zero
• Increases
• Decreases
• Constant

67. Change of momentum is called:

• Force
• Pressure
• Impulse
• Tension

68. For a projectile, the ratio of maximum height reached to the square of flight time is:

• 5 : 4
• 5 : 2
• 5 : 1
• 10 : 1

69. A body is dropped from a tower with zero velocity reaches ground in 4 seconds. The height of the tower is about:

• 80 m
• 20 m
• 160 m
• 40 m

70. A cricket ball is hit so that it travels straight up in air and it can acquires 3 seconds to reach the maximum height. Its initial velocity is:

• 10 m/s
• 15 m/s
• 29.4 m/s
• 12.2 m/s