Class 9th Science Motion Practice Questions

Section A – Multiple Choice Questions (MCQs) [Q.1–20]

1. The SI unit of velocity is:
   a) m/s
   b) km/h
   c) m²/s
   d) m/s²
2. Which of the following is a vector quantity?
   a) Speed
   b) Distance
   c) Displacement
   d) Path length
3. The slope of a distance-time graph gives:
   a) Velocity
   b) Speed
   c) Acceleration
   d) Displacement
4. Which of the following is non-uniform motion?
   a) Car moving at constant speed
   b) Earth revolving around the Sun
   c) A train at rest
   d) A particle in straight line with uniform speed
5. The slope of a velocity-time graph gives:
   a) Speed
   b) Displacement
   c) Acceleration
   d) Distance
6. The area under a velocity-time graph represents:
   a) Displacement
   b) Speed
   c) Distance
   d) Acceleration
7. A body is said to be in uniform motion when:
   a) It covers equal distances in equal intervals of time
   b) It covers unequal distances in equal intervals of time
   c) It is at rest
   d) It moves with increasing speed
8. Negative acceleration is also called:
   a) Retardation
   b) Uniform motion
   c) Uniform acceleration
   d) Constant speed
9. Which of the following is not a correct pair?
   a) Speed – scalar
   b) Velocity – vector
   c) Acceleration – scalar
   d) Displacement – vector
10. Which type of motion is shown by a freely falling stone?
    a) Uniform motion
    b) Non-uniform motion with uniform acceleration
    c) Oscillatory motion
    d) Random motion
11. A train moving with uniform velocity has acceleration:
    a) Zero
    b) Constant
    c) Variable
    d) Negative
12. If a car covers 60 km in 2 hours, its average speed is:
    a) 20 km/h
    b) 30 km/h
    c) 40 km/h
    d) 50 km/h
13. Which of the following graphs represents uniform acceleration?
    a) Straight line parallel to time axis (v–t)
    b) Straight line with positive slope (v–t)
    c) Curve (v–t)
    d) None
14. The unit of acceleration is:
    a) m/s
    b) m/s²
    c) m²/s
    d) km/h
15. Which of the following is in non-uniform acceleration?
    a) Free fall
    b) Car moving on a straight road with uniform speed
    c) A ball moving in circular path
    d) A rocket taking off
16. What does a horizontal line on a distance-time graph indicate?
    a) Object is at rest
    b) Uniform speed
    c) Acceleration
    d) Increasing speed
17. If velocity is decreasing with time, acceleration is:
    a) Positive
    b) Negative
    c) Zero
    d) Infinite
18. Which formula represents the first equation of motion?
    a) v = u + at
    b) s = ut + ½ at²
    c) v² – u² = 2as
    d) a = (v – u)/t
19. Which of the following is correct about displacement?
    a) Always positive
    b) Always zero
    c) Can be positive, negative or zero
    d) Same as distance
20. The motion of the tip of a second’s hand of a clock is:
    a) Uniform circular motion
    b) Oscillatory motion
    c) Rectilinear motion
    d) Random motion

Section B – True/False [Q.21–30]

21. Distance is a vector quantity. (False)
22. Displacement can be zero even if distance is not zero. (True)
23. Acceleration can be negative. (True)
24. Speed is always greater than or equal to velocity. (True)
25. SI unit of acceleration is m/s². (True)
26. Uniform circular motion is an accelerated motion. (True)
27. Average speed = Total distance / Total time. (True)
28. The slope of a v–t graph is velocity. (False)
29. An object moving with uniform velocity has zero acceleration. (True)
30. The distance-time graph for an object at rest is a straight line parallel to the x-axis. (True)

Section C – Fill in the Blanks [Q.31–40]

31. The slope of a distance-time graph gives __________.
32. The slope of a velocity-time graph gives __________.
33. The area under a velocity-time graph gives __________.
34. Negative acceleration is also called __________.
35. Displacement is a __________ quantity.
36. Speed is a __________ quantity.
37. The SI unit of distance is __________.
38. The SI unit of velocity is __________.
39. Uniform circular motion is an example of __________ motion.
40. An object covering equal distances in equal intervals of time is said to have __________ motion.

Section D – Assertion & Reason [Q.41–50]

41. Assertion: Velocity can be negative.
    Reason: Velocity has both magnitude and direction.
    (Options: a) Both true, b) Both false, c) A true R false, d) A false R true)
42. Assertion: Speed and velocity are always the same.
    Reason: Speed is scalar while velocity is vector.
43. Assertion: Distance travelled can never decrease.
    Reason: Distance is the total path length.
44. Assertion: The slope of a velocity-time graph gives acceleration.
    Reason: Acceleration is rate of change of velocity.
45. Assertion: A body moving in a circle at constant speed has uniform motion.
    Reason: Its velocity changes due to change in direction.
46. Assertion: Retardation is also called negative acceleration.
    Reason: Retardation increases the speed of a body.
47. Assertion: Acceleration can be zero even when velocity is not zero.
    Reason: A body moving with constant velocity has zero acceleration.
48. Assertion: In uniform acceleration, equal changes in velocity occur in equal intervals of time.
    Reason: Acceleration is constant.
49. Assertion: The displacement of a particle moving in a circular path after one complete revolution is zero.
    Reason: Displacement depends on initial and final position.
50. Assertion: In a v–t graph, the area under the curve gives acceleration.
    Reason: Acceleration = Δv/Δt.

Section E – Very Short Answer (1 Mark Each) [Q.51–60]

51. Define displacement.
52. What is uniform motion?
53. Write SI unit of velocity.
54. What is retardation?
55. Which physical quantity does the slope of a v–t graph represent?
56. What is the area under a v–t graph equal to?
57. Write the first equation of motion.
58. Write the third equation of motion.
59. Give one example of uniform circular motion.
60. Can average speed be equal to average velocity?

Section F – Short Answer (2 Marks Each) [Q.61–70]

61. Differentiate between distance and displacement.
62. Differentiate between speed and velocity.
63. What is uniform acceleration? Give one example.
64. A car moves with a velocity of 10 m/s and uniformly accelerates at 2 m/s² for 5 s. Find final velocity.
65. Define acceleration and its SI unit.
66. Draw the distance-time graph of uniform motion.
67. Define average speed and average velocity.
68. Can displacement be zero? Explain with an example.
69. What does the slope of a distance-time graph represent?
70. A bus decreases its speed from 80 km/h to 60 km/h in 5 s. Find retardation.

Section G – Short Answer (3 Marks Each) [Q.71–80]

71. Explain the three equations of motion.
72. Derive relation v = u + at from velocity-time graph.
73. A car starts from rest and attains a velocity of 72 km/h in 20 s. Find acceleration.
74. A train moves with velocity of 36 km/h for 10 min, then 54 km/h for next 15 min. Find average speed.
75. Define uniform and non-uniform motion with examples.
76. Draw a v–t graph for uniform acceleration.
77. State conditions when average speed = average velocity.
78. Write differences between scalar and vector quantities (any 4).
79. A body starts from rest and accelerates at 4 m/s² for 10 s. Find distance covered.
80. Explain retardation with one numerical.

Section H – Long Answer (4–5 Marks Each) [Q.81–90]

81. Derive second equation of motion (s = ut + ½at²) using graphical method.
82. Derive third equation of motion (v² – u² = 2as).
83. A car moving with 10 m/s accelerates at 2 m/s² for 15 s. Find final velocity and distance travelled.
84. Differentiate between speed, velocity and acceleration with examples.
85. Draw and explain distance-time graphs for uniform and non-uniform motion.
86. An object is thrown vertically upwards with velocity 20 m/s. Find maximum height and time of flight.
87. Explain the meaning of positive, negative and zero acceleration with graphs.
88. Write differences between uniform motion and non-uniform motion.
89. A stone falls from rest from a height of 20 m. Find velocity after 2 s and distance travelled.
90. Explain graphical representation of motion using displacement-time, velocity-time and acceleration-time graphs.

Section I – Case Study Based [Q.91–100]

Case Study 1 (Q.91–95):
A car accelerates from rest and covers a distance of 200 m in 20 s. Its velocity-time graph is a straight line.

91. What type of motion is this?
92. Draw the v–t graph.
93. Find acceleration of the car.
94. Find final velocity.
95. Find average velocity.

Case Study 2 (Q.96–100):
A ball is dropped from a height and its motion is studied with graphs.

96. What type of acceleration does the ball experience?
97. Draw the v–t graph for the ball.
98. If it falls for 3 s, find velocity at the end.
99. Find distance travelled in 3 s.
100. State whether its motion is uniform or non-uniform.