# Class 9 Physics Chapter 2

Updated: 15 Oct 2023

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Class 9 Physics Chapter 2 is about “Kinematics”. This article includes topics such as Definition of Kinematics, Rest and Motion, Types of Motion, Rest and Motion are Relative, Scalar and Vector Quantities, Distance, Displacement, Speed and types of speed (Average Speed, Instantaneous Speed, Uniform and Variable Speed ), Velocity and types of Velocity (Average Velocity, Instantaneous Velocity, Uniform and Variable Velocity ), Acceleration and types of Acceleration (Average Acceleration, Instantaneous Acceleration, Uniform and Variable Acceleration ), Deceleration/Retardation, Distance-Time Graph, Speed-Time Graph, Velocity Time Graph, Equations of Motion( First Equation of Motion, Second Equation of Motion, Third Equation of Motion) and Motion due to Gravity.

## Class 9 Physics Chapter 2 Notes

### Kinematics Notes

Class 9 Physics Chapter 2 Notes

### Kinematics SLO Based Notes

Class 9 Physics SLO Based Chapter 2

## Physics Class 9 Chapter 2-MCQs

### Kinematics

1 The branch of physics that deals with the study of motion, forces, and energy in physical systems is:
(a) Thermodynamics
(b) Optics
(c) Mechanics
(d) Electricity

Mechanics

2 The study of motion without the reference of force is said to be:
(a) Kinematics
(b) Mechanics
(c) Dynamics
(d) Motion

Kinematics

### Rest and Motion

#### Rest

3 When a body does not change its position with respect to some reference then it will be in state of;
(a) Rest
(b) Motion
(c) Rotatory motion
(d) Vibratory motion

Rest

#### Motion

4 When a body changes its position with respect to some reference then it will be in state of;
(a) Rest
(b) Motion
(c) Rotatory motion
(d) Vibratory motion

Motion

#### Types of Motion

5 Which type of motion refers to the change in position of a body as a whole?
(a) Rotational motion
(b) Curvilinear motion
(c) Translatory motion
(d) Rectilinear motion

Translatory motion

6 Which type of motion refers to the motion of an object along a straight line with no change in direction?
(a) Rotational motion
(b) Curvilinear motion
(c) Translatory motion
(d) Rectilinear motion

Rectilinear motion

7 Which type of motion refers to the circular or curved path motion?
(a) Rotational motion
(b) Curvilinear motion
(c) Translatory motion
(d) Rectilinear motion

Curvilinear motion

8 Which type of motion refers to the irregular motion of a body?
(a) Rotational motion
(b) Curvilinear motion
(c) Random motion
(d) Rectilinear motion

Random motion

9 Motion of gas molecules is an example of:
(a) Rectilinear motion
(b) Curvilinear motion
(c) Rotational motion
(d) Random motion

Random motion

10 What is the term used for the motion of an object around an axis or a fixed point?
(a) Curvilinear motion
(b) Translatory motion
(c) Rotational motion
(d) Vibrational motion

Rotational motion

11 Which type of motion refers to the back-and-forth motion of an object around an equilibrium position?
(a) Curvilinear motion
(b) Translatory motion
(c) Rotational motion
(d) Vibrational motion

Vibrational motion

12 The motion of swing is an example of:
(a) Curvilinear motion
(b) Translatory motion
(c) Rotational motion
(d) Vibrational motion

Vibrational motion

### Position

13 …………….. is the location of object relative to some reference.
(a) Distance
(b) Length
(c) Position
(d) None of these

Position

### Rest and Motion are Relatives

14 Rest and motion are …………. states.
(a) Relative
(b) Absolute
(c) Constant
(d) All of these

Relative

### Scalar and Vector Quantities

15 All those quantities which are completely specified by their magnitude only, are said to be:
(a) Scalars
(b) Vectors
(c) Speed
(d) Velocity

Scalars

16 All those quantities which are completely specified by their magnitude as well as direction, are said to be:
(a) Scalars
(b) Vectors
(c) Speed
(d) Velocity

Vectors

17 Which of the following is a scalar quantity?
(a) Velocity
(b) Time
(c) Displacement
(d) Acceleration

Time

18 Which of the following is a vector quantity?
(a) Temperature
(b) Mass
(c) Time
(d) Displacement

Displacement

19 Force is an example of ……………. quantity?
(a) Scalar
(b) Vector
(c) Both (a) and (b)
(d) None of these

Vector

20 Time is an example of ……………. quantity?
(a) Scalar
(b) Vector
(c) Both (a) and (b)
(d) None of these

Scalar

### Distance

21 The length of a path traveled between two positions is called
(a) Velocity
(b) Acceleration
(c) Distance
(d) Retardation

Distance

22 Which of the following is a scalar quantity?
(a) Distance
(b) Displacement
(c) Velocity
(d) Acceleration

Distance

23 The unit of distance is
(a) Newton
(b) Meter
(c) Pascal
(d) Joule

Meter

### Displacement

24 The shortest distance between two points is known as
(a) Distance
(b) Displacement
(c) Velocity
(d) Acceleration

Displacement

25 Displacement is a ……………..quantity.
(a) Scalar
(b) Vector
(c) Tensor
(d) None of these

Vector

26 The unit of displacement is
(a) Newton
(b) Meter
(c) Pascal
(d) Joule

Meter

27 What is the formula to calculate displacement?
(a) Displacement = final \ position - initial \ position
(b) Displacement = speed \times time
(c) Displacement = distance \times time
(d) None of these

Displacement = final position – initial position

### Speed

28 The distance covered by a body in unit time is known as
(a) Velocity
(b) Speed
(c) Distance
(d) Displacement

Speed

29 What is the SI unit of speed?
(a) meters per second (m/s)
(b) kilometers per hour (km/h)
(c) Meter
(d) Second

meters per second (m/s)

30 Speed is a ……………..quantity.
(a) Scalar
(b) Vector
(c) Tensor
(d) None of these

Scalar

31 What is the formula for calculating speed?
(a) Speed = \frac{Distance}{Time}

(b) Speed = \frac{Time}{Distance}
(c) Speed = Distance \times Time
(d) None of these

Speed = \frac{Distance}{Time}

32 Speed is denoted by:
(a) F
(b) s
(c) v
(d) d

v

#### Types of Speed

33 Which type of speed remains constant throughout the motion?
(a) Average speed
(b) Instantaneous speed
(c) Uniform speed
(d) Variable speed

Uniform speed

34 Total distance divided by total time refers to
(a) Average speed
(b) Instantaneous speed
(c) Uniform speed
(d) Variable speed

Average speed

35 The speed of a body for a very short interval of time refers to
(a) Average speed
(b) Instantaneous speed
(c) Uniform speed
(d) Variable speed

Instantaneous speed

36 The speedometer of a car indicates its:
(a) Average speed
(b) Instantaneous speed
(c) Uniform speed
(d) Variable speed

Instantaneous speed

37 A car travels 100 km in 2 hours. What is its average speed?
(a) 50 km/h
(b) 100 km/h
(c) 150 km/h
(d) 200 km/h

50 km/h

38 The speed of light is approximately taken as:
(a) 3 \times 10^5 m/s
(b) 3 \times 10^8 m/s
(c) 3 \times 10^3 m/s
(d) 3 \times 10^{12} m/s

3 \times 10^8 m/s

39 What is the formula for average speed?
(a) Speed = distance \times time
(b) Speed = \frac{total \ distance \ traveled}{total \ time \ taken}
(c) Speed = final \ velocity - initial \ velocity
(d) None of these

Speed = \frac{total \ distance \ traveled}{total \ time \ taken}

### Velocity

40 The displacement covered by a body in unit time is known as
(a) Velocity
(b) Speed
(c) Distance
(d) Displacement

Velocity

41 What is the SI unit of velocity?
(a) meters per second (m/s)
(b) kilometers per hour (km/h)
(c) Meter
(d) Second

meters per second (m/s)

42 Velocity is a ……………..quantity.
(a) Scalar
(b) Vector
(c) Tensor
(d) None of these

Vector

43 What is the formula for calculating velocity?
(a) Velocity = \frac{Displacement}{Time}
(b) Velocity = \frac{Time}{Displacement}
(c) Velocity = Distance \times Time
(d) None of these

Velocity = \frac{Displacement}{Time}

44 Velocity is denoted by:
(a) F
(b) s
(c) v
(d) d

v

#### Types of Velocity

45 Which type of velocity remains constant throughout the motion?
(a) Average velocity
(b) Instantaneous velocity
(c) Uniform velocity
(d) Variable velocity

Instantaneous velocity

46 Total displacement divided by total time refers to
(a) Average velocity
(b) Instantaneous velocity
(c) Uniform velocity
(d) Variable velocity

Average velocity

47 The velocity of a body for a very short interval of time refers to
(a) Average velocity
(b) Instantaneous velocity
(c) Uniform velocity
(d) Variable velocity

Instantaneous velocity

48 What is the formula for average velocity?
(a) Velocity = displacement \times time
(b) Velocity = \frac{total \ displacement}{total \ time \ taken}
(c) Velocity = final \ velocity - initial \ velocity
(d) None of these

Velocity = \frac{total displacement}{total time taken}

49 Which of the following quantity has both magnitude and direction?
(a) Speed
(b) Velocity
(c) Distance
(d) Time

Velocity

50 A train moves 200 meters north and then 150 meters south. What is its displacement?
(a) 350 meters north
(b) 50 meters south
(c) 50 meters north
(d) 350 meters south

50 meters north

### Acceleration

51 The rate of change in velocity is known as
(a) Velocity
(b) Speed
(c) Acceleration
(d) Displacement

Acceleration

52 What is the SI unit of Acceleration?
(a) meters per second (m/s^2)
(b) kilometers per hour (km/h^2)
(c) Meter
(d) Second

meters per second (m/s^2)

53 Acceleration is a ……………..quantity.
(a) Scalar
(b) Vector
(c) Tensor
(d) None of these

Vector

54 What is the formula for calculating Acceleration?
(a) Acceleration = \frac{Change \ in \ velocity}{Time}
(b) Acceleration = \frac{Time}{velocity}
(c) Acceleration = Distance \times Time
(d) None of these

Acceleration = \frac{Change \ in \ velocity}{Time}

55 Acceleration is denoted by:
(a) F
(b) s
(c) a
(d) d

a

#### Types of Acceleration

56 Which type of Acceleration remains constant throughout the motion?
(a) Average Acceleration
(b) Instantaneous Acceleration
(c) Uniform Acceleration
(d) Variable Acceleration

Uniform Acceleration

57 Total change in velocity divided by total time refers to
(a) Average Acceleration
(b) Instantaneous Acceleration
(c) Uniform Acceleration
(d) Variable Acceleration

Average Acceleration

58 The Acceleration of a body for a very short interval of time refers to
(a) Average velocity
(b) Instantaneous velocity
(c) Uniform velocity
(d) Variable velocity

Instantaneous velocity

59 What is the formula for average Acceleration?
(a) Acceleration = displacement \times time
(b) Acceleration = \frac{total \ change \ in \ velocity}{total \ time \ taken}
(c) Acceleration = final \ velocity - initial \ velocity
(d) None of these

Acceleration = \frac{total \ change \ in \ velocity}{total \ time \ taken}

60 Which of the following quantity has both magnitude and direction?
(a) Speed
(b) Acceleration
(c) Distance
(d) Time

Acceleration

61 An object undergoes a constant acceleration of 5 m/s^2 . What will be its change in velocity after 4 seconds?
(a) 9 m/s
(b) 15 m/s
(c) 4 m/s
(d) 20 m/s

20 m/s

### Deceleration/ Retardation

62 When an object slows down, its acceleration is called
(a) Uniform acceleration
(b) Non-uniform acceleration
(c) Deceleration
(d) None of these

Deceleration

### Distance Time Graph

63 Which graph represents the relationship between distance traveled and time elapsed?
(a) Velocity-time graph
(b) Speed-time graph
(c) Acceleration-time graph
(d) Distance-time graph

Distance-time graph

64 In a distance-time graph, the slope represents:
(a) Speed
(b) Velocity
(c) Time
(d) Acceleration

Speed

65 What does a slope of zero speed indicate in a distance-time graph?
(a) The object is not moving
(b) The object is moving with constant speed
(c) The object is moving with variable speed
(d) The object is accelerating

The object is not moving

66 The distance is increasing linearly with time, then the body is moving with:
(a) Zero speed
(b) Uniform speed
(c) Variable speed
(d) None of these

Uniform speed

67 The distance is changing non-linearly with time, then the body is moving with:
(a) Zero speed
(b) Uniform speed
(c) Variable speed
(d) None of these

Variable speed

### Speed Time Graph

68 Which graph represents the relationship between speed and time elapsed?
(a) Velocity-time graph
(b) Speed-time graph
(c) Acceleration-time graph
(d) Distance-time graph

Speed-time graph

69 In a speed-time graph, the slope represents:
(a) Speed
(b) Velocity
(c) Time
(d) Magnitude of Acceleration

Magnitude of Acceleration

70 In a speed-time graph, the area under the curve represents:
(a) Speed
(b) Distance
(c) Time
(d) Displacement

Distance

### Velocity Time Graph

71 Which graph represents the relationship between velocity and time elapsed?
(a) Velocity-time graph
(b) Speed-time graph
(c) Acceleration-time graph
(d) Distance-time graph

Velocity-time graph

72 In a velocity-time graph, the slope represents:
(a) Speed
(b) Velocity
(c) Time
(d) Acceleration

Acceleration

73 In a velocity-time graph, the area under the curve represents:
(a) Speed
(b) Distance
(c) Time
(d) Displacement

Displacement

### Equations of Motion

74 There are …………. equations of motion.
(a) 2
(b) 3
(c) 4
(d) 5

3

#### First Equation of Motion

75. Which equation of motion represents the relationship between initial velocity, final velocity, acceleration, and time?
(a) First equation of motion
(b) Second equation of motion
(c) Third equation of motion
(d) All of these

First equation of motion

76. The first equation of motion is given by:
(a) v_f = v_i + at
(b) s = vi_t + \frac{1}{2}at^2
(c) 2as = v_f^2 - vi_2
(d) None of these

v_f = v_i + at

#### Second Equation of Motion

77. Which equation of motion represents the relationship between initial velocity, displacement, acceleration, and time?
(a) First equation of motion
(b) Second equation of motion
(c) Third equation of motion
(d) All of these

Second equation of motion

78. The second equation of motion is given by:
(a) v_f = v_i + at
(b) s = vi_t + \frac{1}{2}at^2
(c) 2as = v_f^2 - vi_2
(d) None of these

s = vi_t + \frac{1}{2}at^2

#### Third Equation of Motion

79. Which equation of motion represents the relationship between initial velocity, final velocity, acceleration, and displacement?
(a) First equation of motion
(b) Second equation of motion
(c) Third equation of motion
(d) All of these

Third equation of motion

80. The third equation of motion is given by:
(a) v_f = v_i + at
(b) s = vi_t + \frac{1}{2}at^2
(c) 2as = v_f^2 - vi_2
(d) None of these

2as = v_f^2 - vi_2

81 The formula for the area of a trapezoid is:
(a) Area = (sum \ of \ parallel \ sides) \times base
(b) Area = \frac{base \times (sum \ of \ parallel \ sides)}{2}
(c) Area = \frac{base}{(sum \ of \ parallel \ sides)}
(d) None of these

Area = \frac{base \times (sum \ of \ parallel \ sides)}{2}

### Motion due to Gravity

82 The motion of an object falling under the influence of gravity is known as:
(a) Uniform motion
(b) Free fall
(c) Circular motion
(d) Rotatory motion

Free fall

83 During free fall, the acceleration of the object is:
(a) Zero
(b) Negative
(c) Positive and constant
(d) Positive but varying

Positive and constant

84 What is meant by free fall?
(a) Motion of an object along a straight line
(b) Motion of an object under the influence of gravity only
(c) Motion of an object around an axis
(d) Motion of an object in a circular path

Motion of an object under the influence of gravity only

85 The equation of motion for an object in free fall due to gravity is:
(a) v_f = v_i + at
(b) s = vi_t + \frac{1}{2}at^2
(c) 2as = v_f^2 - vi_2
(d) h = \frac{1}{2}gt^²

h = \frac{1}{2}gt^²

86 Which of the following is true for an object in free fall near the surface of the Earth?
(a) It experiences zero acceleration
(b) Its acceleration is directed upwards
(c) Its acceleration is directed downwards
(d) It experiences uniform motion

Its acceleration is directed downwards

87 If a body is falling under the gravity then its gravitational acceleration will be taken as:
(a) Positive
(b) Negative
(c) Zero
(d) None of these

Positive

88 If a body is throwing upward, against the gravity then its gravitational acceleration will be taken as:
(a) Positive
(b) Negative
(c) Zero
(d) None of these

Negative

89 If a body is throwing upward then its finial velocity at the highest point will be taken as:
(a) Positive
(b) Negative
(c) Zero
(d) None of these

Zero

90 The value of ‘g’ at sea level is taken as:
(a) 9.8 m/s^2
(b) 32 ft/s^2
(c) Both (a) and (b)
(d) None of these

Both (a) and (b)

## Review Exercise Chapter 2

91. The average speed of a bus is 20 ms^{-1} , how far can it travel in 10s?
(a) 100 m
(b) 200 m
(c) 150 m
(d) 250 m

200 m

92. A truck accelerates uniformly from 15 ms^{-1} \ to \ 20 ms^{-1} \ in \ 5 s . Whit is the acceleration of the truck?
(a) 2 ms^{-2}
(b) 1.5 ms^{-2}
(c) 1 ms^{-2}
(d) 2.5 ms^{-2}

1 ms^{-2}

93. A car moving along a straight line at 20 ms^{-1} under goes an acceleration of 4 ms^{-2} . After 2 s , its speed will be
(a) 28 ms^{-1}
(b) 16 ms^{-1}
(c) 12 ms^{-1}
(d) 8 ms^{-1}

28 ms^{-1}

94. A bird begins to accelerate a constant 0.3 m/s^2 \ for \ 3 s. its change in velocity is
(a) 0.9 m/s
(b) 15.m/s
(c) 1.95 m/s
(d) 2.4 m/s

0.9 m/s

95. A car is going backward at 5 m/s . After 10 s of uniform acceleration, the car is going forward at 10 m/s . The acceleration is:
(a) 0.5 m/s^2
(b) 0.75 m/s^2
(c) 1.5 m/s^2
(d) 4 m/s^2

1.5 m/s^2

96. The slope of distance – time graph represents:
(a) Acceleration
(b) Change in acceleration
(c) Speed
(d) Distance

Speed

97. The area under a speed – time graph represents:
(a) Acceleration
(b) Change in acceleration
(c) Distance
(d) Velocity

Distance

98. A student is riding his bicycle on a straight flat road covers one block every 7 seconds. If each block is 100m long, he is traveling at:
(a) Constant speed
(b) Constant velocity
(c) 10m/s
(d) Both (a) & (b)

Both (a) & (b)

99. You drop a rock from a bridge to the river below. When the rock has fallen 4 m, you drop a second rock. As the rocks continue their free fall, their separation
(a) Increase
(b) Decrease
(c) Stay the same
(d) None of these