MCQ questions for class 9 Science Chapter 9 Force and Laws Of Motion
Question 1: What is the tendency of an object to resist any change in its state of rest or motion called?
Inertia
Acceleration
Momentum
Force
Question 2: The property of an object by virtue of which it tends to remain at rest or in uniform motion along a straight line is called:
Force
Inertia
Momentum
Acceleration
Question 3: The SI unit of force is the:
Newton
Joule
Watt
Pascal
Question 4: Which of Newton's laws states that "Every object continues to remain in a state of rest or uniform motion unless acted upon by an external force"?
First law of motion
Second law of motion
Third law of motion
Law of gravitation
Question 5: The force acting on an object is equal to the mass of the object multiplied by its acceleration. This statement represents:
First law of motion
Second law of motion
Third law of motion
Law of gravitation
Question 6: According to Newton's third law of motion, action and reaction forces are always equal and opposite. This law is also known as the law of:
Gravitation
Conservation of energy
Conservation of momentum
Action and reaction
Question 7: Which of the following is an example of the third law of motion?
A book resting on a table
A ball rolling on the ground
A rocket taking off
A car accelerating on a straight road
Question 8: The force of gravity acting on an object is also known as its:
Weight
Mass
Inertia
Momentum
Question 9: If the force acting on an object is doubled, and its mass remains constant, what happens to its acceleration?
It doubles
It halves
It quadruples
It remains the same
Question 10: If the mass of an object is doubled, and the force acting on it remains constant, what happens to its acceleration?
It doubles
It halves
It quadruples
It remains the same
Question 11: Which law of motion explains the propulsion of a rocket?
First law of motion
Second law of motion
Third law of motion
Law of gravitation
Question 12: If a car is moving with a constant velocity, what can be said about the net force acting on it?
It is zero
It is non-zero
It is increasing
It is decreasing
Question 13: The force required to keep an object moving with a constant velocity on a frictionless surface is called:
Applied force
Tension force
Frictional force
Net force
Question 14: When you push a wall with your hands, why doesn't it move?
Because the wall exerts an equal and opposite force
Because the wall has a large inertia
Because the wall has no inertia
Because the wall is heavier than you
Question 15: What happens to the acceleration of an object if the net force acting on it is doubled?
It doubles
It halves
It quadruples
It remains the same
Question 16: The force exerted by a stretched or compressed spring is called:
Frictional force
Tension force
Spring force
Applied force
Question 17: Which of the following is a contact force?
Gravitational force
Magnetic force
Frictional force
Electrostatic force
Question 18: In which direction does the frictional force act on a moving object?
In the direction of motion
Opposite to the direction of motion
Perpendicular to the direction of motion
Toward the center
Question 19: If an object experiences a net force of 20 N and has an acceleration of 4 m/s², what is its mass?
5 kg
10 kg
16 kg
80 kg
Question 20: The force of friction always acts in a direction opposite to the:
Net force
Applied force
Normal force
Weight of the object
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