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
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