physics MCQs - 9th class Chapter 02 Mcqs

1

A physical quantity described completely by its magnitude only is called a

A

Vector

B

Scalar

C

Resultant quantity

D

Derived quantity

2

Which of the following is a vector quantity?

A

Speed

B

Mass

C

Displacement

D

Time

3

The study of motion of objects without referring to forces is known as

A

Dynamics

B

Mechanics

C

Kinematics

D

Relativity

4

If a body does not change its position with respect to its surroundings, it is said to be at

A

Rest

B

Motion

C

Equilibrium

D

Vibration

5

The motion of a body along a straight line is called

A

Circular motion

B

Rotatory motion

C

Vibratory motion

D

Linear motion

6

The motion of a Ferris wheel is an example of

A

Linear motion

B

Random motion

C

Circular motion

D

Vibratory motion

7

A body repeating its to and fro motion about a fixed position is undergoing

A

Translatory motion

B

Rotatory motion

C

Vibratory motion

D

Random motion

8

The shortest distance between the initial and final positions of a motion is called

A

Distance

B

Displacement

C

Path length

D

Speed

9

The SI unit for both distance and displacement is

A

Kilometer

B

Centimeter

C

Metre

D

Inch

10

The distance covered in unit time is known as

A

Velocity

B

Acceleration

C

Speed

D

Displacement

11

If a body moves from point A to B along a curved path, the displacement is the

A

Length of the curved path

B

Average path length

C

Straight line from A to B

D

Initial position A

12

The speed of a vehicle shown by its speedometer at any instant is called

A

Average speed

B

Uniform speed

C

Instantaneous speed

D

Variable speed

13

Average velocity is defined as

A

Total distance / Total time

B

Displacement / Time

C

Change in speed / Time

D

Total path / Time

14

If the speed and direction of a moving body do not change, the velocity is said to be

A

Variable

B

Non-uniform

C

Instantaneous

D

Uniform

15

The time rate of change of velocity is called

A

Speed

B

Displacement

C

Acceleration

D

Force

16

Negative acceleration is also known as

A

Deceleration

B

Uniform acceleration

C

Variable acceleration

D

Centripetal acceleration

17

The SI unit of acceleration is

A

m s⁻¹

B

m s⁻²

C

km h⁻¹

D

cm s⁻²

18

In a distance-time graph, a straight line represents motion with

A

Uniform acceleration

B

Variable speed

C

Uniform speed

D

Deceleration

19

In a distance-time graph, a horizontal line indicates that the object is

A

Accelerating

B

Decelerating

C

Moving with uniform speed

D

At rest

20

The gradient (slope) of a distance-time graph is equal to the

A

Acceleration

B

Displacement

C

Average speed

D

Total distance

21

In a speed-time graph, a line rising upward shows that the speed is

A

Decreasing

B

Constant

C

Increasing

D

Zero

22

What does the gradient of a speed-time graph represent?

A

Distance

B

Speed

C

Displacement

D

Acceleration

23

The area under a speed-time graph is numerically equal to the

A

Acceleration

B

Average speed

C

Distance covered

D

Final velocity

24

For a freely falling body, the initial velocity is taken as

A

10 m s⁻¹

B

9.8 m s⁻¹

C

Zero

D

Maximum

25

What is the approximate value of 'g' (free fall acceleration) used for calculations near Earth?

A

9.8 m s⁻²

B

10 m s⁻²

C

3 x 10⁸ m s⁻¹

D

15 m s⁻²

26

What is the universal speed limit for any object in the universe?

A

3 x 10⁸ m s⁻²

B

10 m s⁻²

C

3 x 10⁸ m s⁻¹

D

9.8 m s⁻¹

27

To add vectors, the rule used is called the

A

Right-hand rule

B

Left-hand rule

C

Head-to-tail rule

D

Screw rule

28

Which branch of mechanics deals with forces and their effect on the motion of objects?

A

Kinematics

B

Statics

C

Dynamics

D

Optics

29

The motion of a bee is an example of what type of motion?

A

Linear

B

Circular

C

Rotatory

D

Random

30

If a car is moving on a circular road with constant speed, its velocity is

A

Constant

B

Zero

C

Changing

D

Uniform

31

According to the text, the fastest land mammal, the cheetah, has a top speed of

A

100 km h⁻¹

B

110 km h⁻¹

C

120 km h⁻¹

D

90 km h⁻¹

32

When a paratrooper falls with uniform velocity, the downward force of gravity is balanced by the

A

Upward thrust

B

Air resistance

C

Frictional force

D

Tension in strings

33

If a car accelerates from rest to 144 km h⁻¹ in 20 seconds, what is the distance covered?

A

400 m

B

50 m

C

1400 m

D

1440 m

34

The numerical ratio of displacement to distance is always

A

less than one

B

equal to one

C

greater than one

D

equal to or less than one

35

If a ball is dropped from a tower, what is the distance it covers in the first second? (Use g = 10 m s⁻²)

A

10 m

B

5 m

C

15 m

D

20 m

36

A horizontal line on a speed-time graph shows that the acceleration of the motion is

A

Positive

B

Negative

C

Constant

D

Zero

37

The direction of gravitational acceleration 'g' is always

A

Upwards

B

Downwards

C

Horizontal

D

Depends on the mass

38

When a body is thrown vertically upward, its final velocity at the highest point is

A

Maximum

B

Negative

C

Zero

D

Equal to initial velocity

39

In graphical analysis, the independent quantity is normally taken along the

A

y-axis

B

x-axis

C

z-axis

D

Origin

40

A vector is represented graphically by a straight line with an

A

Arrow head

B

Dot

C

Circle

D

Cross

41

The magnitude of a vector is represented by the

A

Direction of the line

B

Angle of the line

C

Length of the line

D

Thickness of the line

42

Which of the following is a scalar quantity?

A

Force

B

Velocity

C

Energy

D

Weight

43

The motion of the drum of a washing machine dryer is an example of

A

Translatory motion

B

Rotatory motion

C

Vibratory motion

D

Linear motion

44

To represent the direction of a vector, how many mutually perpendicular lines are required?

A

One

B

Two

C

Three

D

Four

45

The point where the x-axis and y-axis meet is known as the

A

Reference point

B

Origin

C

Midpoint

D

Intersection

46

If the velocity of an object is increasing, we say the object is

A

Decelerating

B

At rest

C

Accelerating

D

Moving uniformly

47

The equation S = vᵢt + ½at² is which equation of motion?

A

First

B

Second

C

Third

D

Fourth

48

If a car travels from Lahore to Multan covering 320 km, this value represents the

A

Displacement

B

Velocity

C

Distance

D

Acceleration

49

When adding vectors, the resultant vector is drawn from the tail of the first vector to the

A

Head of the first vector

B

Tail of the last vector

C

Head of the last vector

D

Origin

50

If an arrow is thrown vertically upward, the value of 'g' is taken as

A

Positive

B

Negative

C

Zero

D

Constant