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

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**Both Bold and Underlined option is correct**

**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 cos****θ**- 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 sin****θ**- 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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