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# 9th Class Chapter 2 Physics Short Questions

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##### Question: 1
What is a vector quantity?
1-120
Vector quantity described completely by magnitude and direction . Example: Weight, force, momentum etc.
##### Question: 2
What is velocity?
2-120
The rate of change of displacement of a body is known as its velocity . It is a vector quantity . Formula: V= d/t
##### Question: 3
What is scalar quantity and also give example.
3-120
A quantity which can be described by its magnitude only is called scalar quantity Example: Distance, work,power etc.
##### Question: 4
Define Rest.
4-120
A body is said to be at rest, if it is not changing its position with respect to its surroundings . Example: A tree with respect to a platform is at rest because it does not change it position.
##### Question: 5
Define speed.
5-120
Distance moved by an object in unit time is called speed. Formula: its formula is v=s/t its unitis ms-1
##### Question: 6
What is rotatory motion? Give example.
6-120
The spinning motion of a body about its axis is called rotatory motion. Example: The Motion of wheel about its axis. Earth revolves around its geographical axis that causes day and night.
##### Question: 7
Define uniform speed.
7-120
A body has uniform speed if it covers equal distance in equal intervals of time however the short interval may be .
##### Question: 8
Define Motion.
8-120
A body is said to be in motion, if it changes its position with respect to its surroundings. Example: A train is changing its position with respect of platform so it is in motion .
##### Question: 9
Define circular motion.
9-120
Motion of a body in a circular path is called circular motion. in circular motion a point around which body moves lies outside the body
##### Question: 10
Define acceleration.
10-120
Rate of change of velocity of a body in caused it acceleration, it is a vector quantity. Formula: a= Vf-Vi/t Unit is ms-2 or Kmh-2
##### Question: 11
Define vibratory motion.
11-120
To and fro motion of a body about its mean position is known as vibratory motion Example: Pendulum of clock has vibratory motion.
##### Question: 12
Define scalar quantity and also give example
12-120
A quantity which can be discribed by its magnitude only is called scalar quantity
##### Question: 13
Differentiate between translator motion and circular motion.
13-120
Translators motion: In translational motion, a body moves along a line without any rotation. the lines may be straight or curved. Example. i. Motion of the side in ferris wheel. ii. Motion of a car along a straight line.
##### Question: 14
Define axis:
14-120
An axis is a line around which a body rotates.
##### Question: 15
Define uniform velocity:
15-120
If a body covers equal displacement in equal intervals of time however short the interval may be is known as uniform velocity.
##### Question: 16
How a vector can be represented graphically
16-120
Graphically a vector can be represented by a line segment with an arrow head.
Example: In figure, a line AB write arrow head on one side. The length of line shows the magnitude of vector and the arrow head shows its direction.
##### Question: 17
Define terminal velocity
17-120
When an object moves vertically downward nd it attains uniform velocity. Then its uniform velocity is called terminal velocity.
##### Question: 18
Differentiate between Rest and motion.
18-120
Rest: A body is said to be at rest , if it is not changing its position with respect to its surroundings. Examples: A wall ii. A chair
##### Question: 19
What is graph?
19-120
Graph is a pictorial way of presenting information about relation between various quantities.The quantities are dependent and independent.
##### Question: 20
What is rotatory motion
20-120
The spinning motion of a body about its axis is called rotatory motion
##### Question: 21
Define Brownian motion.
21-120
Random motion of gas molecules is called brownian motion.
##### Question: 22
Define rest
22-120
A body is said to be at rest, if it is not changing its position with respect to its surroundings.
##### Question: 23
Differentiate between distance and displacemnt.
23-120
1.Distance: Length of path between two points is called distance between those points. 2.Distance is scalar quantity and its symbol is S. 3.Its units is metere.
##### Question: 24
What is graph
24-120
Graph is pictorial way of presenting information about relation between various quantities The quantities re dependent and independent
##### Question: 25
Define variable.
25-120
The quantities among which the graph is plotted are called variables.
##### Question: 26
Does speedometer of a car measure its velocity.
26-120
No, speedometer only measure the speed of the car, because it can not indicate the direction of motion of the car.
##### Question: 27
Why vector quantities cannot be added and subtracted like scalar quantities.
27-120
Vectors cannot be added like scalars because in scalars we have only magnitude so scalars are added by ordinary algebra while in vectors direction is also important so, they can be added using head to tail rule.
##### Question: 28
Who noticed about all freely falling objects fall with same acceleration
28-120
Galileo was the first scientist who noticed about all freely falling objects fall with same acceleration g
##### Question: 29
Define uniform acceleration.
29-120
A body as uniform acceleration if it has equal changes in velocity in equal intervals of time however short interval may be.
##### Question: 30
Can a body moving at a constant speed have acceleration
30-120
No because there is no change in its speed. While change in speed is a necessary condition for acceleration, fso acceleration will be zero But except in a circular path.
##### Question: 31
What is velocity
31-120
The rate of change of displacement of a body is know as its velocity. it is a vector quantity
##### Question: 32
How are vector quantities important to us in our daily life.
32-120
With the help of vectors we can locate or point out the position of any object Action and reaction forces can also be explain in terms of vectors.
##### Question: 33
What would be shape of speed-time graph of a body moving with variable speed.
33-120
Shape of a speed-time graph of an object moving with variable speed will always be a curve. It would never be a straight line.
##### Question: 34
How do riders in a ferris wheel possess translatory motion but not rotatory motion
34-120
Riders of Ferris wheel possess translatory motion because they move in circular track without spinning while the itself motion of Ferris wheel is rotatory.
##### Question: 35
When bodies are moving in downward direction
35-120
Initial velocity v of the freely faling body will be zero
Gravitational acceleration will be positive.
##### Question: 36
Which of the following can be obtained from speed-time graph of a body
36-120
Initial speed, Final speed. Distance covered,
Using speed time graph of a body we can find all of above quantitites as distance covered can be find out by the area under line curve and acceleration can be find out by the slope of line.
##### Question: 37
Sketch a distance-time graph for a body starting from rest. How will you determine speed of body from this graph
37-120
Distance-time graph for a body starting from rest are of two types.
When speed is constant speed can be determined by slope of line
When speed is variable speed can be find out by slope of tangent line at any point
##### Question: 38
Define axis.
38-120
An axis is a line around which a body rotates.
##### Question: 39
Define dependent and independent quantities.
39-120
The quantitiy which can vary with our wish is called independent quantity
Dependent The quantity whose value according to the changes in independent quantity dependent quantity.
##### Question: 40
Wha is significance of graph in daily life
40-120
A graph may also be used in everyday life such as to show year wise growth decline of export month-wise rain fall, a patients temperature record or runs per over scored by a team.
##### Question: 41
Define uniform speed
41-120
A body has uniform speed if it covers equal distance in equal intevals of time however the short interval may be
##### Question: 42
What is LIDAR
42-120
A motorway speed camera. A LIDAR gun is light detection and ranging speed gun It uses the time taken by laser pulse to make a series of measurements of a vehicle distance from the gun The data is then used to calculate the vehicle's speed
##### Question: 43
Define circular motion
43-120
Circular Motion: Motion of a body in a circular path is called circular motion. In circular motion a point around which body moves lies outside the body.
##### Question: 44
Define gravitational acceleration
44-120
The acceleration of a body when it moves vertically upward or downward freely is called gravitational acceleration
It is denoted by g
Its magnitude is 10ms at earth
##### Question: 45
A sprin'er complete its 100m race 12s, Find its average speed
45-120
Total distance=100m
Average speed= Displacement/Time Taken
##### Question: 46
What is meant by position
46-120
The term position describe the location of a place or point with respect to some reference point is called origin.
##### Question: 47
Define variable
47-120
The quantities among which the graph is plotted are called variables
##### Question: 48
When doses the acceleration of a body is positive and negative.
48-120
When the velocity of a moving body is increasing with time its acceleration is positive When the velocity of a moving body is decreasing with time its acceleration is taken as negative it is also called retardation or deceleration,
##### Question: 49
Under what conditions the value of g is positive/negative
49-120
Positive value When the body is moving vertically downward the value of g is positive
##### Question: 50
How can we convert kmh into ms
50-120
The given speed in kmh is divided by 3.6 to the speed in ms
##### Question: 51
When body are moving in upward direction
51-120
Final velocity vf of the body will be zero
Gravitational acceleraton will be negative
##### Question: 52
In the absence of air resistance during the free fall motion, which body ground first light or heavy
52-120
As the gravitational acceleration is independent of the mass of the body so if we neglect air resistance all the bodies fall to the ground at the same time.
##### Question: 53
How are vector quantities important to use in our daily
53-120
Vector quantities are important to us in our daily life in engineering, building and drawing diffferent techniques. If we want find direction of moving object then we can do with help of vector quantities.
##### Question: 54
Does speedometer of a car measure its velocity
54-120
No speedometer only measures the speed of the car because it can indicate the direction of motion of the car.
##### Question: 55
When a body falls freely, which quantity remains the same and which increases
55-120
During the free fall motion, acceleration is independent of the mass of the body remains the same throughout the motion and velocity of the body increases continuously.
##### Question: 56
How ms2 converted into kmh2
56-120
To convert acceleration form ms to kmh we multiply it with 12960
##### Question: 57
Cheeta can run at a speed of 70 kmh convert this speed
57-120
speed of Cheetah =v= 70kmh
##### Question: 58
Why does the velocity of a thrown up body become zero at the highest point
58-120
When a body is thrown vertically upward it moves under gravity against the force of attraction of Earth So after every second the velocity of the body decreases by 9.8 and ultimately becomes zero at the highest point That is why the velocity of a body becomes zero at the highest point
##### Question: 59
Define vibratory motion
59-120
To and Fro motion of a body about its mean position is known as vibratory motion
##### Question: 60
What are the points to be kept in mind when bodies are moving freely under gravity
60-120
While using equatins of motion for bodies falling freely, it should be kept in mind that
##### Question: 61
A body is moving with uniform speed
61-120
Velocity of a body has magnitude as well as direction. For a body to more with uniformvelocity it speeds as well as its direction should remain the same Thus it can only me possible if a body is moving in a straight line with constant speed, then its velocity will also be uniform i.e if a body does not change its direction.
##### Question: 62
Sketch a speed time graph of on object moving with uniform
62-120
If a body is moving uniform changing speed its speed time graph is straight line
##### Question: 63
Give an example of a body that is at rest and is in motion at the same time.
63-120
A passenger sitting in a moving bus is at rest because he/she is not changing his/her position with respect to other passenger or objects in the bus. But to an observer outside the bus, the passengers and the objects inside the bus are in motion
##### Question: 64
Different between distance and displacement.
64-120
The difference b/w distance and displacement is following.

##### Question: 65
Differentiate between rest and motion
65-120
Rest A body is said to be at rest, if is not changing its position with respect to its surroundings.
A wall, A chair
##### Question: 66
What is Lidar gun
66-120
A Lidar gun is light detection and ranging speed gun It uses the time taken by laser pulse to make a series of measurements of a vehicles distance from the gun. The data is then used to calculate the vehicles speed
##### Question: 67
Differentiate between translator motion and circular motion
67-120
In translational motion, a body moves along a line without any rotation., The lines may be straight or curved
Example Motion of the sides in Ferris wheel.
Motion of a car long a straight line.
##### Question: 68
Define Kinematic
68-120
Kinematics: Kinematics is the study of motion of an objects without discussing the casuse of motion.
##### Question: 69
A train moves with a uniform velocity of 36 kmh for 10s
69-120
velocity of train = v = 36kmh
##### Question: 70
Define uniform acceleration
70-120
A body as uniform acceleration if it has equal changes velocity in equal interval of time. however short interval may be
##### Question: 71
Mention the type of motion in each of the following
71-120
A ball moving vertically upward: If a ball is moving vertically upward then its motion is linear
##### Question: 72
Differentiate distance and displacement.
72-120
Distance: Length of a path between two points is called the distance between those points.
It is a scalar quantity.
Distance represented by S
Distance can be find by the formula
In picture dotted line shows distance.
##### Question: 73
Define random motion and give example.
73-120
Random Motion:
The disordered or irregular motion of an object is called random motion for example, the motion of insects and birds.
##### Question: 74
Define Brownain motion
74-120
Define Brownian motion
##### Question: 75
how can we convert 1ms into kmh
75-120
The given speed in ms is multiplied by 3.6 to get speed in kilometer per hour
##### Question: 76
What do you know about position?
76-120
Position:
The term position describes the location of a place or a point with respect to some reference point called origin.
##### Question: 77
Writer four examples of vectors.
77-120
Scalar: The quantities which are described completely by its magnitude only is called scalar quantities.
Examples: Mass, length, time speed and volume.
##### Question: 78
Why vector quantities cannot be added and subtracted like scalar quantities
78-120
The quantities having direction cannot be added and subtracted like scalar quantities because scalar quantities have no any direction but the vector quantities have direction.
##### Question: 79
How is a vector represented
79-120
There are two methods to represent a vector
##### Question: 80
What would be the shape of a speed time graph of a body moving with variable speed.
80-120
When a body is moving with variable speed the shape of its speed time graph is not a straight line It is always a curved path.
##### Question: 81
Write types of motion
81-120
There are three types of motion.
Translatory motion linear random and circular motion
Rotatory motion, Vibratory motion.
##### Question: 82
Difference between scalar and vector.
82-120
Scalar:
1- A scalar quantity is described completely by its magnitude only.
2- Mass, length, time etc are examples of scalars.
##### Question: 83
Define position and give exmple.
83-120
Position means the location of a certain place or object from a reference point
Examples: In figure the point P represents the positive of the body with respect to origin O
##### Question: 84
Define speed and write its unit.
84-120
Speed The distance covered by an object in unit time is called its speed Speed is scalar quantity
##### Question: 85
Define velocity and rite its equation
85-120
Velocity: The rate of change of displacement is called velocity
##### Question: 86
Define two types of motion.
86-120
Linear Motion: Straight line motion of a body is know as its linear motion.
Example Car moving on straight line.
##### Question: 87
How vector quantities are representation
87-120
Graphically a vector can be represented by a line segment with an arrow head which represents its direction and the length of line segment gives its magnitude according to selected scale. AB is length of vector V and its diectioin is from A to B
##### Question: 88
Convert 50kmh-¹ speed of a body into ms-¹
88-120
Speed of the body= 50kmh-¹
50 x 1000/3600 ms-¹
##### Question: 89
Define uniform velocity
89-120
A body has uniform speed if it covers equal distance in equal intervals of time however short to interval may be.
##### Question: 90
Write equations of motion
90-120
Equations of motion due to gravity are as
##### Question: 91
Define vector and write the name of two methods of vector,quantities, representation,
91-120
Vector:
A vector quantity is described completely by magnitude and direction
There are two methods of vector representation.
1- Symbolic representation
2-Graphical representation
##### Question: 92
Define uniform speed and uniform velocity.
92-120
Uniform speed: A body has uniform speed if it covers equal distance in equal intervals of time however short the interval may be
##### Question: 93
Define terminal velocity.
93-120
Terminal velocity: The uniform velocity of free falling objects attains is called terminal velocity.
Example A paratrooper attains a uniform velocity called terminal velocity with which comes to ground
##### Question: 94
Define Average Velocity and write its formula.
94-120
Average Velocity: The change in total is displacement with respect to total time is called average velocity
Average Velocity: Total displacement/total time.
##### Question: 95
What is the equation of motion
95-120
Equation of Motion:
Equations of motion for uniformly acceleratedmotion are
Vf= Vi +at
S= Vit +1/2at²
2aS =Vf²-Vi²

##### Question: 96
Define gravitationalacceleration .
96-120
The accelerationof freely falling bodies is called gravitationalacceleration. Its value is 10ms-²
##### Question: 97
A sprinter completes its 100 meter race in 12 Find his average speed
97-120
Total distance = 100m
Total time taken = 12s
Average speed= Total distence covered/Total time taken

##### Question: 98
A player coves 80m distance in 10 second
98-120
Required: Average speed =vav

##### Question: 99
Define circular motion . With example
99-120
Circular Motion:
The motion of a object in a circular path is known as circular motion of ceiling fan.
##### Question: 100
Define circular motion. With example.
100-120
Circular Motion:
The motion of a object in a circularpath is known as circular motion.
Example :
Motion of earth around sun.
##### Question: 101
Differentiate speed and velocity.
101-120
Speed Rate of change of distance is called speed.
It is a scalar quantity
Its unit is ms
It is drived by following formula.

##### Question: 102
Define gravitational acceleration.
102-120
The acceleration of a freely falling bodies is cled gravitational acceleration. It is denoted by g Its value is

##### Question: 103
A car starts from rest. Its velocity becomes 20ms-¹ in 8s.
Find the acceleration.
103-120
Vi = 0ms-¹
Vf= 20ms-¹
t= 8s
a = ?
We know that
a =Vf - Vi/t
putting values, we get
a= 2=-0/8
a=20/8 =2.5
a= 2.5ms-² ans
##### Question: 104
Define kinematics
104-120
Kinematics:
The study of motion of objects without discussing the cause of motion is called kinematics.
##### Question: 105
Differentiate between variable and uniform speed
105-120
Variable speed: A body has variable speed if does not cover equal distance in equal intervals of time. however short the interval may be.
##### Question: 106
Define vibratory motion and give example.
106-120
Vibratory Motion:
To and fro motion of a body aboutsits mean position is known as vibratory motion.
Example:
Motion of a see-saw.
##### Question: 107
Define rotatory motion. With example.
107-120
Rotatory Motion:
The spinning motion of a body about its axis is called rotatory motion.
Examples:
Motion of top, motion of ceiling fan.
##### Question: 108
Define Motion also write its types.
108-120
Motion: A body is said to be motion, if it changes its postion with respect to tis surrounding.
##### Question: 109
Write three equations of motion for bodies moving under gravity.
109-120
Following are the equations of motion under gravitation.
First equation of motion vf= vi+gt
##### Question: 110
Define acceleration and write its formula.

110-120

Acceleration:

The rate of change of velocity ofbodyis called acceleration.

Formula:

=Vf-Vi/t

##### Question: 111
What is retardation
111-120
The acceleration of a body whose velocity decreases is called retardation It is also called negative acceleration of body
##### Question: 112
How is a vector represented?
112-120
Graphically a vector can be represented by a line segment with a arrow head which represents its direction and the length of line segment gives its magnitude according to selected scale.
##### Question: 113
What is difference between positive acceleration and negative acceleration
113-120
Negative acceleration: Acceleration of body is negative if velocity of the body decreases with time The negative acceleration is also called deceleration or retardation.
When moving bodies stops it gives retardation
The direction of negative acceleration is opposite to the direction in which the body in moving.
##### Question: 114
Define rest and motion.
114-120
Rest:
A body is said to be at rest if it does not change its position with respect to its surroundings.
Motion:
A body is said to be in motion if it changes its position with respect to its surroundings.
##### Question: 115
Convert 20ms speed in kmh
115-120
Speed in ms = 20ms
##### Question: 116
Write types of motion types of Motion:
116-120
There are three types of motion.
1- Translatory motion
2- Rotatory motion
3- Vibratory motion.
##### Question: 117
Can a body moving at a constant speed have acceleration?
117-120
Yes, When a body move along circular path with constant speed it has acceleration due to centripetal force
##### Question: 118
Write down the formula and unit to find Acceleration.
118-120
Formula: Acceleration can be found out by given formula
Acceleration = Change in velocity/time taken
##### Question: 119
Differentiate between distance and displacement.