physics MCQs - 9th class Chapter 03 Mcqs

1

Which of the following is defined as a push or a pull that can change the state of motion of a body?

A

Inertia

B

Force

C

Momentum

D

Weight

2

The property of a body to resist a change in its state of rest or motion is called?

A

Momentum

B

Force

C

Inertia

D

Acceleration

3

According to the PDF, which of the following is an example of a contact force?

A

Gravitational force

B

Magnetic force

C

Friction

D

Electrostatic force

4

A non-contact force is also known as a?

A

Field force

B

Frictional force

C

Tension force

D

Normal force

5

Newton's first law of motion is also known as the law of?

A

Action-reaction

B

Inertia

C

Momentum

D

Gravitation

6

The SI unit of force is?

A

Kilogram

B

Meter per second

C

Joule

D

Newton

7

One newton (1 N) is the force that produces an acceleration of 1 m/s² in a body of mass?

A

1 g

B

10 kg

C

1 kg

D

100 g

8

According to Newton's third law, for every action, there is an equal and opposite?

A

Force

B

Momentum

C

Inertia

D

Reaction

9

Which force keeps the Earth in orbit around the Sun?

A

Magnetic force

B

Electrostatic force

C

Gravitational force

D

Nuclear force

10

The weakest of the four fundamental forces is?

A

Electromagnetic force

B

Strong nuclear force

C

Weak nuclear force

D

Gravitational force

11

What is the product of mass and velocity known as?

A

Impulse

B

Force

C

Momentum

D

Inertia

12

The weight of an object is a measure of the?

A

Quantity of matter

B

Gravitational force on it

C

Inertia of the object

D

Friction it experiences

13

A body is in a state of uniform motion. What is the net force acting on it?

A

Increasing

B

Decreasing

C

Zero

D

Cannot be determined

14

Mass is a __________ quantity.

A

Vector

B

Scalar

C

Fundamental

D

Derived

15

The force of friction that exists before an object starts to move is called?

A

Kinetic friction

B

Rolling friction

C

Static friction

D

Limiting friction

16

The force F, mass m, and acceleration a are related by the equation?

A

F = m/a

B

F = a/m

C

F = ma

D

F = m-a

17

When a car stops suddenly, passengers tend to bend forward due to?

A

Momentum

B

Velocity

C

Friction

D

Inertia

18

The upward force exerted by a liquid on an object immersed in it is called?

A

Drag

B

Thrust

C

Tension

D

Normal force

19

Which scientist was awarded the Nobel Prize for helping unify the weak and electromagnetic forces?

A

Isaac Newton

B

Albert Einstein

C

Dr. Abdus Salam

D

Sheldon Glashow

20

A free-body diagram is used to show?

A

Only the gravitational force

B

Only the motion of the body

C

All forces acting on an object

D

The mass of the object

21

The SI unit of momentum is?

A

N s

B

kg m/s²

C

N/m

D

kg/s

22

Impulse is defined as the product of force and?

A

Distance

B

Time interval

C

Velocity

D

Mass

23

Rolling friction is generally _________ than sliding friction.

A

Greater

B

Equal to

C

Much less

D

Slightly more

24

The constant velocity reached by a falling object when air resistance equals the force of gravity is called?

A

Escape velocity

B

Initial velocity

C

Terminal velocity

D

Final velocity

25

Which of the following is NOT a fundamental force in nature?

A

Gravitational force

B

Electromagnetic force

C

Tension force

D

Strong nuclear force

26

An electronic balance is described as being more precise than a?

A

Spring balance

B

Digital force meter

C

Mechanical balance

D

Newton meter

27

The force that brings certain materials like rubber bands back to their original shape after deformation is?

A

Tension force

B

Elastic force

C

Normal force

D

Drag force

28

The value of the gravitational constant G is?

A

9.8 m/s²

B

6.67 x 10^-11 N m²/kg²

C

10 N/kg

D

3.0 x 10^8 m/s

29

The force responsible for the beta decay of a nucleus is the?

A

Strong nuclear force

B

Electromagnetic force

C

Gravitational force

D

Weak nuclear force

30

The process of making a vehicle's shape pointed from the front to reduce air friction is called?

A

Streamlining

B

Balancing

C

Minimizing

D

Lubricating

31

When a bullet is fired from a gun, the gun recoils. This is an example of?

A

Newton's first law

B

Newton's second law

C

Newton's third law

D

Law of gravitation

32

The mass of an object is a measure of its?

A

Weight

B

Inertia

C

Volume

D

Force

33

Weight is a __________ quantity.

A

Scalar

B

Base

C

Vector

D

Dimensionless

34

A spring balance is an instrument used to measure?

A

Mass

B

Time

C

Force

D

Length

35

The friction between two solid surfaces in motion is called?

A

Static friction

B

Kinetic friction

C

Rolling friction

D

Limiting friction

36

The rate of change of momentum of a body is equal to the?

A

Impulse

B

Force acting on it

C

Acceleration

D

Total energy

37

In an isolated system, the total momentum before a collision is __________ the total momentum after the collision.

A

Greater than

B

Less than

C

Equal to

D

Half of

38

The force of reaction exerted by a surface on an object lying on it is the?

A

Gravitational force

B

Friction

C

Weight

D

Normal force

39

Which force is responsible for holding protons and neutrons together in the nucleus?

A

Gravitational force

B

Electromagnetic force

C

Weak nuclear force

D

Strong nuclear force

40

A force meter is also known as a?

A

Barometer

B

Thermometer

C

Newton meter

D

Voltmeter

41

The energy wasted due to friction often appears in the form of?

A

Light

B

Sound

C

Heat

D

Potential energy

42

Ball bearings are used in machines to convert sliding friction into?

A

Static friction

B

Kinetic friction

C

Rolling friction

D

No friction

43

The unit of gravitational field strength 'g' can be expressed as?

A

N kg

B

kg/N

C

N/kg

D

N s

44

The principle of conservation of momentum applies to?

A

Macro-objects only

B

Micro-objects only

C

Both macro and micro-objects

D

Only objects at rest

45

Crumple zones in automobiles are designed to?

A

Increase the force of impact

B

Increase the time of impact

C

Make the car heavier

D

Decrease the car's inertia

46

The force that opposes the motion of a body through a fluid is called?

A

Thrust

B

Drag

C

Tension

D

Air resistance

47

For a body moving with constant velocity, its acceleration is?

A

Constant and non-zero

B

Increasing

C

Decreasing

D

Zero

48

If a net force F acts on a mass m, the acceleration is inversely proportional to?

A

The force F

B

The velocity v

C

The mass m

D

Time t

49

According to the text, what is the approximate value of 'g' used for calculations?

A

9.8 m/s²

B

10 N/kg

C

6.67 N/kg

D

9.8 N

50

Newton's laws of motion are not exact when an object is moving close to the speed of?

A

Sound

B

Light

C

Rotation of Earth

D

A car