Chapter 4: Describing Motion Around Us

🔹 1. What is Motion?

• An object is said to be in motion if it changes its position with respect to time and surroundings.
• Example: A moving car, flying bird

🔹 2. What is Rest?

• An object is at rest if its position does not change with respect to time and surroundings.
• Rest and motion are relative terms

Motion in a Straight Line (Rectilinear Motion)

• Motion in a straight line is called rectilinear motion.
• In this type of motion, an object moves along a straight path.

Examples

• A car moving on a straight road
• A train moving on a straight track
• A person walking in a straight line

Important Terms

Term	Meaning
Distance	Total path covered by an object
Displacement	Shortest distance between initial and final position
Speed	Distance travelled per unit time
Velocity	Displacement per unit time in a given direction
Acceleration	Rate of change of velocity

🔹 3. Types of Motion

Rectilinear Motion

• Motion in a straight line
• Example: Train on straight track

Circular Motion

• Motion along a circular path
• Example: Clock hands, Earth around Sun

Periodic Motion

• Motion repeated at regular intervals
• Example: Swing, pendulum

Random Motion

• No fixed path
  👉 Example: Dust particles in air

Types of Motion

Type of Motion	Meaning	Example
Rectilinear Motion	Motion in a straight line	A car moving on a straight road
Circular Motion	Motion along a circular path	Hands of a clock
Rotational Motion	Motion around an axis	Earth rotating on its axis
Periodic Motion	Motion repeated at regular intervals	Pendulum of a clock
Oscillatory Motion	To and fro motion about a mean position	Swing moving back and forth
Random Motion	Motion without a fixed path	Movement of insects
Uniform Motion	Object covers equal distances in equal intervals of time	Train moving at constant speed
Non-uniform Motion	Object covers unequal distances in equal intervals of time	Bus moving in traffic

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4. Distance and Displacement

Distance

• Total path covered by an object
• Scalar quantity (only magnitude)
• SI unit meter (m)

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Displacement

• Shortest straight-line distance between initial and final position
• Vector quantity (magnitude + direction)
• SI unit meter (m)

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Key Difference:

• Distance ≥ Displacement always

Difference Between Distance and Displacement

Basis	Distance	Displacement
Meaning	Total path travelled by an object	Shortest path between initial and final position
Type of Quantity	Scalar quantity	Vector quantity
Direction	No direction	Has direction
Value	Always positive	Can be positive, negative, or zero
Depends On	Actual path travelled	Initial and final positions only
Example	Walking around a park	Straight line from start to end point

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🔹 5. Speed

Speed

• Speed is the distance travelled by an object in a unit time.
• speed is scalar quantity
• SI unit : metre per second (m/s)
• Example A car moving at 60 km/h,

Formula of Speed

$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$

Where:

• Distance = Total path travelled
• Time = Time taken to travel

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6. Types of Speed

Type of Speed	Meaning
Uniform Speed	Equal distances covered in equal intervals of time
Non-uniform Speed	Unequal distances covered in equal intervals of time
Average Speed	Total distance ÷ Total time
Instantaneous Speed	Speed at a particular instant

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🔹 7. Velocity

• Velocity is the rate of change of displacement with respect to time.
• In simple words, it is the speed in a given direction.
• metre per second (m/s)
• vector quantity
• it can be +ve, -ve or zero

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Formula of Velocity

$\text{Velocity} = \frac{\text{Displacement}}{\text{Time}}$

Where:

• Displacement = Shortest distance in a particular direction
• Time = Time taken

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Types of Velocity

Type	Meaning
Uniform Velocity	Constant speed in a fixed direction
Non-uniform Velocity	Changes in speed or direction
Average Velocity	Total displacement ÷ total time

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Example

• A car moving 10 m east in 2 seconds has velocity = 5 m/s east
• If direction changes, velocity also changes even if speed is same

Difference Between Speed and Velocity

Basis	Speed	Velocity
Meaning	Distance travelled per unit time	Displacement per unit time in a given direction
Nature	Scalar quantity	Vector quantity
Direction	No direction	Has direction
Depends on	Distance	Displacement
Can be negative?	No	Yes (depends on direction)
Change in direction	Does not affect speed	Affects velocity
Formula	$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$	$\text{Velocity} = \frac{\text{Displacement}}{\text{Time}}$
Example	A car moving at 40 km/h	A car moving 40 km/h north

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🔹 8. Acceleration

• Acceleration is the rate of change of velocity of an object with respect to time.
• It tells us how quickly the velocity of an object is increasing or decreasing.
• SI Unit of Acceleration : metre per second squared (m/s²)
• Acceleration is a vector quantity (has direction).
• It can be positive, negative, or zero.
• Zero acceleration means velocity is constant.
• Example : A bike increases its speed from 0 m/s to 20 m/s in 5 seconds, it is accelerating.

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Formula of Acceleration

$a = \frac{v – u}{t}$

Where:

• a = acceleration
• v = final velocity
• u = initial velocity
• t = time taken

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Types of Acceleration

Type	Meaning	Example
Positive Acceleration	Velocity increases with time	A car speeding up
Negative Acceleration (Retardation/Deceleration)	Velocity decreases with time	A moving car applying brakes
Uniform Acceleration	Equal change in velocity in equal time intervals	Freely falling object (ideal case)
Average acceleration	change in velocity divided by time interval	used when acceleration is not constant

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🔹 9. Graphical Representation of Motion

Position -Time Graph

• Straight line → uniform motion
• Curved line → non-uniform motion
• A position–time graph shows how the position of an object changes with time.
• It helps us understand the motion of an object easily.
• X-axis (horizontal) → Time (t), Y-axis (vertical) → Position (distance or displacement)
• slope = speed (distance time graph)
• slope = velocity (displacement time graph)

Position–Time Graph Comparison (Tab Form)

Case	Nature of Motion	Shape of Graph	Speed	Example
Object at Rest	No motion	Straight horizontal line	Zero	Book kept on table
Uniform Motion	Constant speed	Straight slanting line	Constant	Car moving at steady speed
Non-uniform Motion	Changing speed	Curved line	Changing	Bus in traffic
Acceleration (speeding up)	Speed increases with time	Curve becoming steeper	Increasing	Bicycle speeding up
Deceleration (slowing down)	Speed decreases with time	Curve becoming less steep	Decreasing	Car applying brakes

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📊 Velocity-Time Graph

• A velocity–time graph shows the change in velocity with time.
• Time is shown on the X-axis.
• Velocity is shown on the Y-axis.
• The slope of the graph gives acceleration.
• Types of Velocity–Time Graphs
  • Constant Velocity → Horizontal straight line
  • Increasing Velocity → Upward sloping line
  • Decreasing Velocity → Downward sloping line
• $a=\frac{v-u}{t}$
• Area under velocity-time graph = displacement
• Area under speed-time graph = distance

1. Constant Velocity – Acceleration = zero
2. Uniform Acceleration – Acceleration is in the direction of velocity
3. Uniform Retardation – Acceleration is in the opposite direction of velocity
4. Non-Uniform Acceleration – Acceleration increasing
5. Non-Uniform Acceleration – Acceleration decreasing

🔹 10. Uniform Motion vs Non-uniform Motion

Uniform Motion	Non-uniform Motion
Equal speed	Changing speed
Constant velocity	Variable velocity

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🔹 11. Equations of Motion or kinematic equations

• These equation is only applicable when acceleration is constant.
• v = u + at
• s = ut + ½at²
• v² = u² + 2as

Where:
u = initial velocity
v = final velocity
a = acceleration
s = distance

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🔹 12. Types of Motion

Type of Motion	Meaning	Dimensions Involved	Example
1D Motion	Motion along a straight line	One dimension	Train on a straight track
2D Motion	Motion in a plane	Two dimensions	Throwing a ball
3D Motion	Motion in space	Three dimensions	Flying airplane

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13. Uniform Circular Motion

• Motion of an object in a circular path with constant speed
• Ex.- Satellite around Earth, stone tied to a string, fan blades
• Characteristics :
  • Speed remains constant,
  • but direction keeps changing;
  • due to changing direction velocity is not constant;
  • so acceleration is present towards the center (centripetal acceleration)
  • direction of velocity-tangent at that point
• Formula for centripetal acceleration :
• $a_c = \frac{v^2}{r}$
  • Where:
  • $a_c$ac​ = centripetal acceleration
  • $v$v = speed of object
  • $r$r = radius of circular path

Quantity	Formula	Meaning
Average speed in circular motion	= circumference / time	Distance per time
Average velocity (1 full round)	0	Displacement per time

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14. Comparision of Graphs

Property	Distance–Time Graph	Displacement–Time Graph	Speed–Time Graph	Velocity–Time Graph
Slope of graph	Speed	Velocity	Acceleration	Acceleration
Area under graph	No physical significance	No physical significance	Distance travelled	Displacement
Horizontal line	Object at rest	Object at rest	Constant speed	Constant velocity
Positive slope	Distance increasing	Positive velocity	Positive acceleration	Positive acceleration
Negative slope	Not possible	Negative velocity	Negative acceleration (retardation)	Negative acceleration
Zero slope	Object at rest	Object at rest	Zero acceleration (constant speed)	Zero acceleration (constant velocity)
Steeper slope	Greater speed	Greater velocity	Greater acceleration	Greater acceleration
Can graph lie below X-axis?	No	Yes	No	Yes
Quantity obtained from slope	Speed	Velocity	Acceleration	Acceleration
Quantity obtained from area	None	None	Distance	Displacement

Chapter 4: Describing Motion Around Us — MCQs (1–120)

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🔹 Basic Concepts of Motion (1–30)

1. Motion is defined as: A. change in shape B. change in position C. change in mass D. change in color
2. Rest means: A. no change in position B. moving fast C. circular motion D. acceleration
3. Motion is always measured with respect to: A. time B. reference point C. speed D. force
4. Rest and motion are: A. absolute B. relative C. fixed D. constant
5. Example of motion: A. tree B. moving car C. stone D. wall
6. Example of rest: A. flying bird B. parked car C. running train D. flowing river
7. Motion in straight line is called: A. circular B. rectilinear C. periodic D. random
8. Motion along circular path is: A. rectilinear B. circular C. random D. oscillatory
9. Repeated motion is: A. circular B. periodic C. rectilinear D. random
10. Dust particles show: A. rectilinear B. random C. circular D. periodic motion
11. SI unit of distance is: A. km B. m C. cm D. mm
12. Distance is a: A. vector B. scalar C. force D. velocity
13. Displacement is a: A. scalar B. vector C. mass D. time
14. Distance is always: A. less than displacement B. equal or greater than displacement C. negative D. zero
15. Displacement depends on: A. path B. direction C. time only D. mass
16. Distance depends on: A. shortest path B. actual path C. direction D. force
17. SI unit of displacement is: A. m B. km C. cm D. mm
18. Zero displacement means: A. object moved B. no change in position C. fast motion D. circular motion
19. Distance covered is always: A. zero B. positive C. negative D. vector
20. Displacement can be: A. only positive B. positive or negative C. only zero D. only scalar
21. Motion in a pendulum is: A. random B. periodic C. circular D. rectilinear
22. Earth revolving around sun is: A. random B. circular C. rectilinear D. oscillatory
23. A moving train on straight track shows: A. circular motion B. rectilinear motion C. random motion D. periodic motion
24. A moving fan blade shows: A. rectilinear B. circular C. random D. oscillatory
25. SI unit of time is: A. minute B. hour C. second D. day
26. Motion of a ceiling fan is: A. random B. circular C. rectilinear D. periodic only
27. A body is at rest if: A. moving fast B. position unchanged C. accelerating D. rotating
28. Motion depends on: A. color B. reference point C. shape D. size
29. A moving object may appear at rest to: A. all observers B. moving observer C. fixed observer D. none
30. Reference point is also called: A. origin B. motion point C. rest point D. speed point

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🔹 Speed, Velocity & Acceleration (31–70)

31. Speed = A. distance/time B. displacement/time C. force/time D. mass/time
32. Velocity = A. distance/time B. displacement/time C. speed×time D. force/mass
33. Speed is a: A. vector B. scalar C. force D. displacement
34. Velocity is a: A. scalar B. vector C. mass D. energy
35. SI unit of speed is: A. m/s B. m²/s C. kg/m D. N
36. Uniform speed means: A. changing speed B. constant speed C. zero speed D. negative speed
37. Non-uniform speed means: A. constant speed B. changing speed C. zero motion D. circular motion only
38. Acceleration = A. speed/time B. change in velocity/time C. distance/time D. force/time
39. SI unit of acceleration: A. m/s B. m/s² C. km/s D. N/m
40. Positive acceleration means: A. speed decreases B. speed increases C. no motion D. circular motion
41. Negative acceleration is called: A. velocity B. deceleration C. speed D. force
42. If velocity is constant, acceleration is: A. zero B. infinite C. negative D. positive
43. Speed depends on: A. distance & time B. mass C. force D. shape
44. Velocity depends on: A. direction B. color C. weight D. size
45. Displacement/time gives: A. speed B. velocity C. force D. mass
46. Distance/time gives: A. velocity B. speed C. acceleration D. force
47. Acceleration occurs when: A. velocity changes B. mass changes C. time stops D. distance is zero
48. A body moving in circle has: A. constant velocity B. changing velocity C. zero velocity D. constant speed only
49. Uniform motion means: A. changing speed B. equal distance in equal time C. no motion D. circular motion
50. Non-uniform motion means: A. equal distance B. unequal speed C. no motion D. rest
51. Velocity can be: A. only positive B. positive or negative C. only zero D. only scalar
52. Speed is always: A. negative B. positive C. zero only D. vector
53. Acceleration can be: A. only positive B. positive or negative C. only zero D. scalar only
54. Retardation means: A. increase in speed B. decrease in speed C. no motion D. circular motion
55. Motion of car in traffic is: A. uniform B. non-uniform C. no motion D. circular
56. A freely falling body has: A. zero acceleration B. constant acceleration C. variable speed only D. no motion
57. Gravity produces: A. no motion B. acceleration C. rest D. force only
58. SI unit of velocity is: A. m/s B. m/s² C. km² D. N
59. Speedometer measures: A. acceleration B. speed C. force D. distance
60. Odometer measures: A. speed B. distance C. force D. velocity
61. Acceleration is change in: A. distance B. velocity C. force D. mass
62. Negative acceleration reduces: A. mass B. speed C. time D. distance
63. If object is at rest, speed is: A. 1 B. 0 C. infinite D. negative
64. Circular motion has: A. constant velocity B. changing direction C. no motion D. no speed
65. Velocity is defined with: A. only magnitude B. magnitude and direction C. only time D. only distance
66. Speed is always: A. vector B. scalar C. force D. acceleration
67. Acceleration depends on: A. velocity change B. mass only C. force only D. distance only
68. Motion in a straight line is: A. circular B. rectilinear C. random D. periodic
69. Speed is independent of: A. distance B. direction C. time D. magnitude
70. Velocity changes if: A. direction changes B. mass changes C. time stops D. distance is zero

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🔹 Graphs & Advanced Concepts (71–120)

71. Distance-time graph slope gives: A. speed B. force C. mass D. acceleration
72. Velocity-time graph slope gives: A. speed B. acceleration C. distance D. mass
73. Area under velocity-time graph gives: A. acceleration B. displacement C. speed D. force
74. Straight line in distance-time graph shows: A. rest B. uniform motion C. acceleration D. circular motion
75. Curved graph shows: A. uniform motion B. non-uniform motion C. rest D. zero speed
76. Flat line in distance-time graph means: A. motion B. rest C. acceleration D. velocity
77. Slope in graph represents: A. direction B. rate of change C. mass D. force
78. Distance-time graph for rest is: A. straight slant B. horizontal line C. curve D. circle
79. Velocity-time graph for uniform motion is: A. curve B. straight horizontal line C. zigzag D. circle
80. Acceleration is zero when velocity is: A. changing B. constant C. negative D. zero only
81. Motion can be described using: A. graphs B. colors C. smell D. taste
82. Motion in space is relative to: A. object B. reference point C. force D. mass
83. Displacement can be zero even if distance is: A. zero B. non-zero C. negative D. infinite
84. Round trip displacement is: A. zero B. distance C. speed D. acceleration
85. Speed has no: A. magnitude B. direction C. time D. unit
86. Velocity has: A. no direction B. direction C. no time D. no magnitude
87. Acceleration is rate of change of: A. speed B. velocity C. distance D. mass
88. A car moving in circle has: A. constant velocity B. changing direction C. no speed D. rest
89. Motion of Earth is: A. random B. circular C. rectilinear D. stationary
90. Motion of pendulum is: A. random B. periodic C. circular D. straight
91. Uniform motion graph is: A. curve B. straight line C. circle D. zigzag
92. Non-uniform motion graph is: A. straight B. curve C. flat D. horizontal
93. Acceleration is zero when: A. velocity changes B. velocity constant C. distance changes D. force applied
94. Velocity is zero when object is: A. moving B. at rest C. accelerating D. rotating
95. Distance-time graph slope is: A. velocity B. speed C. acceleration D. force
96. Motion in zigzag path is: A. rectilinear B. random C. circular D. periodic
97. A moving fan shows: A. rectilinear B. circular C. random D. straight
98. SI unit of acceleration is derived from: A. speed B. velocity/time C. force D. mass
99. Motion depends on: A. observer B. color C. weight D. size
100. Speed is ratio of: A. time/distance B. distance/time C. force/mass D. velocity/time
101. Velocity is ratio of: A. displacement/time B. distance/time C. force/time D. mass/time
102. Acceleration increases when: A. velocity changes faster B. time increases C. distance decreases D. mass decreases
103. Motion of bicycle is: A. uniform always B. non-uniform mostly C. circular D. rest
104. Graph shows motion in: A. numbers B. visual form C. sound D. smell
105. Slope indicates: A. direction B. steepness C. mass D. force
106. Faster motion has: A. low speed B. high speed C. zero speed D. negative speed
107. Slower motion has: A. high speed B. low speed C. zero time D. no distance
108. Rest means: A. motion B. no motion C. acceleration D. force
109. Motion of planets is: A. random B. circular C. straight D. no motion
110. Speed is measured by: A. thermometer B. speedometer C. barometer D. ammeter
111. Distance cannot be: A. zero B. negative C. positive D. large
112. Displacement can be: A. negative B. positive or negative C. zero only D. none
113. Motion is always relative to: A. sun B. observer C. earth D. air
114. Graph helps to understand: A. smell B. motion C. color D. sound
115. Acceleration is zero in: A. uniform motion B. rest C. both A and B D. circular motion
116. Uniform speed means: A. changing B. constant C. zero D. random
117. Velocity includes: A. only magnitude B. magnitude and direction C. only direction D. none
118. Motion of train is: A. always uniform B. often non-uniform C. circular D. random
119. Free falling object has: A. zero acceleration B. constant acceleration C. no motion D. random motion
120. Displacement is: A. scalar B. vector C. force D. mass

Answer Key (1–120)

Q	A	Q	A	Q	A	Q	A	Q	A
1	B	21	B	41	B	61	B	81	B
2	B	22	B	42	A	62	B	82	B
3	B	23	B	43	A	63	B	83	B
4	B	24	B	44	A	64	B	84	A
5	B	25	C	45	B	65	B	85	B
6	B	26	B	46	B	66	B	86	B
7	B	27	B	47	A	67	A	87	B
8	B	28	B	48	B	68	B	88	B
9	B	29	B	49	B	69	B	89	B
10	B	30	A	50	B	70	A	90	B
11	B	31	B	51	B	71	B	91	B
12	B	32	B	52	B	72	B	92	B
13	B	33	B	53	B	73	B	93	B
14	B	34	B	54	B	74	B	94	B
15	B	35	B	55	B	75	B	95	A
16	B	36	B	56	B	76	B	96	B
17	B	37	B	57	B	77	B	97	B
18	B	38	B	58	A	78	B	98	B
19	B	39	B	59	B	79	C	99	A
20	B	40	B	60	B	80	B	100	C

Graph-Based MCQs (1–50)

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🔹 Distance–Time Graph (1–25)

1. Slope of distance–time graph gives: A. acceleration B. speed C. force D. mass
2. A straight line in distance–time graph shows: A. rest B. uniform motion C. acceleration D. random motion
3. A horizontal line in distance–time graph shows: A. motion B. rest C. acceleration D. velocity
4. Curved distance–time graph shows: A. uniform motion B. non-uniform motion C. rest D. zero speed
5. Steeper slope means: A. slow speed B. high speed C. no speed D. rest
6. Less steep slope means: A. higher speed B. lower speed C. no motion D. acceleration
7. Distance–time graph cannot be: A. straight B. curved C. horizontal D. circular
8. If distance increases uniformly, graph is: A. curve B. straight line C. zigzag D. circle
9. If object is at rest, graph is: A. upward line B. horizontal line C. curve D. slope
10. Distance-time graph is always: A. straight B. graphical representation C. force diagram D. vector
11. Uniform motion is shown by: A. curved line B. straight line C. circle D. zigzag
12. Non-uniform motion is shown by: A. straight line B. curved line C. horizontal line D. no graph
13. Slope of graph represents: A. mass B. speed C. force D. time
14. If slope is zero, object is: A. moving fast B. at rest C. accelerating D. rotating
15. Equal distance in equal time gives: A. curved graph B. straight line C. no graph D. circle
16. Distance-time graph shows relation between: A. speed & force B. distance & time C. mass & velocity D. force & time
17. Graph for constant speed is: A. curve B. straight line C. zigzag D. circle
18. Increasing slope means: A. decreasing speed B. increasing speed C. no speed D. rest
19. Decreasing slope means: A. acceleration B. deceleration C. rest D. uniform motion
20. Horizontal line means: A. motion B. rest C. acceleration D. force
21. A graph with changing slope shows: A. uniform motion B. non-uniform motion C. rest D. no time
22. Distance-time graph is plotted with: A. time on x-axis B. distance on x-axis C. force on x-axis D. mass on x-axis
23. Distance is plotted on: A. x-axis B. y-axis C. both D. none
24. Time is plotted on: A. x-axis B. y-axis C. both D. none
25. Straight line graph indicates: A. changing speed B. constant speed C. no motion D. circular motion

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🔹 Velocity–Time Graph (26–50)

26. Slope of velocity-time graph gives: A. speed B. acceleration C. force D. mass
27. Area under velocity-time graph gives: A. acceleration B. displacement C. speed D. force
28. Straight horizontal line in v–t graph shows: A. acceleration B. uniform velocity C. rest D. force
29. Rising line in v–t graph shows: A. deceleration B. acceleration C. rest D. constant speed
30. Falling line in v–t graph shows: A. acceleration B. deceleration C. rest D. force
31. Zero slope in v–t graph means: A. acceleration B. no acceleration C. force D. mass
32. Curved v–t graph shows: A. uniform motion B. non-uniform acceleration C. rest D. no motion
33. Velocity-time graph is used to find: A. force B. acceleration C. color D. mass
34. Uniform velocity is shown by: A. curved line B. horizontal straight line C. circle D. zigzag
35. Acceleration increases when slope: A. decreases B. increases C. becomes zero D. negative
36. Deceleration is shown by: A. rising graph B. falling graph C. horizontal graph D. circle
37. Area under graph represents: A. speed B. displacement C. force D. mass
38. Velocity-time graph axes are: A. distance-time B. velocity-time C. force-time D. mass-time
39. Time is always on: A. y-axis B. x-axis C. both D. none
40. Velocity is on: A. x-axis B. y-axis C. both D. none
41. Constant acceleration graph is: A. straight line B. curve C. horizontal D. zigzag
42. Zero velocity means graph lies on: A. x-axis B. y-axis C. curve D. slope
43. Increasing velocity shows: A. downward slope B. upward slope C. horizontal line D. circle
44. Decreasing velocity shows: A. upward slope B. downward slope C. horizontal D. no graph
45. Flat v–t graph means: A. acceleration B. constant velocity C. rest D. force
46. Steep slope in v–t graph means: A. low acceleration B. high acceleration C. rest D. zero speed
47. Velocity-time graph is also called: A. motion graph B. speed graph C. force graph D. mass graph
48. Acceleration is: A. slope of distance graph B. slope of velocity graph C. area under distance graph D. none
49. Displacement from graph is: A. slope B. area under curve C. height D. width
50. Motion graphs help to study: A. force only B. motion behavior C. color change D. mass only

Answer Key (Graph-based MCQs 1–50)

Q	A	Q	A	Q	A	Q	A	Q	A
1	B	11	B	21	B	31	B	41	A
2	B	12	B	22	A	32	B	42	A
3	B	13	B	23	B	33	B	43	B
4	B	14	B	24	A	34	B	44	B
5	B	15	B	25	B	35	B	45	B
6	B	16	B	26	B	36	B	46	B
7	D	17	B	27	B	37	B	47	A
8	B	18	B	28	B	38	B	48	B
9	B	19	B	29	B	39	B	49	B
10	B	20	B	30	B	40	B	50	B