The quantity that opposes inertia.

The quantity that keeps the velocity constant.

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MCQ : Force And Laws Of Motion - 1 Class 9 Science MCQs & solutions - Free

MCQ Practice Test & Solutions: MCQ : Force And Laws Of Motion - 1 (10 Questions)

You can prepare effectively for Class 9 Science Class 9 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "MCQ : Force And Laws Of Motion - 1". These 10 questions have been designed by the experts with the latest curriculum of Class 9 2026, to help you master the concept.

Test Highlights:

- Format: Multiple Choice Questions (MCQ)
- Duration: 10 minutes
- Number of Questions: 10

MCQ : Force And Laws Of Motion - 1 - Question 1

Newton’s third law of motion explains the two forces namely ‘action’ and ‘reaction’ coming into action when the two bodies are in contact with each other. These two forces:

A.
Always act on the same body.
B.
Have the same magnitude and direction.
C.
Acts on either body at normal to each other.
D.
Always act on the different bodies in opposite directions.

Detailed Solution: Question 1

Newton’s third law states that action and reaction forces are:

Equal in magnitude
Opposite in direction
Act on different objects

Therefore, the correct statement is that they always act on different bodies in opposite directions.

MCQ : Force And Laws Of Motion - 1 - Question 2

The inertia of an object tends to cause the object ______.

A.
to increase its speed.
B.
to decrease its speed.
C.
to resist any change in the state of rest or of motion.
D.
to decelerate due to friction.

Detailed Solution: Question 2

Inertia of an object is the tendency of the object to resist change in motion. The inertia is directly dependent on the mass of the body.
Inertia resists any change in its state of motion and is of three types:

Inertia of rest
Inertia of motion
Inertia of direction

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MCQ : Force And Laws Of Motion - 1 - Question 3

While catching a stone thrown by your friend you pull the hands back to______.

A.
avoid getting hurt.
B.
increase the time to slow down.
C.
decrease the time to slow down.
D.
avoid the breaking of the stone.

Detailed Solution: Question 3

While catching a fast moving cricket ball, a fielder in the ground gradually pulls his hand backward with the moving ball, in doing so, the fielder increases the time during which the high velocity of the moving ball decrease to zero.
This, the acceleration of the ball is decreased and therefore, the impact of catching the fast moving ball is also reduced.

MCQ : Force And Laws Of Motion - 1 - Question 4

Which one of the following statements is not correct for an object moving along a straight path in an accelerated motion?

A.
Its speed keeps changing.
B.
Its velocity always changes.
C.
It always goes away from earth.
D.
A force is always acting on it.

Detailed Solution: Question 4

The question states an accelerated motion of an object along a straight line, this implies a non zero force is acting on the object, which is increasing its velocity and speed.
However the direction of force is not given so it can’t be determined that it is moving away from the earth, Hence the correct answer is C.

MCQ : Force And Laws Of Motion - 1 - Question 5

The v - t graph of a body of 5 kg moving with the help of a force is shown. Then the force involved is______.

A.
20 N
B.
125 N
C.
12.5 N
D.
2.0 N

Detailed Solution: Question 5

a = slope of graph = = 2.5 m/s²
F = ma = 5 x 2.5 = 12.5 N
(c) is correct.

MCQ : Force And Laws Of Motion - 1 - Question 6

Force is defined as:

A.
Change in momentum.
B.
Rate of change of momentum.
C.
The quantity that opposes inertia.
D.
The quantity that keeps the velocity constant.

Detailed Solution: Question 6

"The rate of change of momentum is called force”. “ When a net force acts on a body, it produces acceleration in thr body and will be equal to rate of change of momentum”. Hence , we found that Rate of change of momentum is equal to Force applied on the object .

MCQ : Force And Laws Of Motion - 1 - Question 7

When no external force acts on an object, the physical quantity that remains conserved is______.

A.
Weight
B.
momentum
C.
acceleration
D.
force

Detailed Solution: Question 7

If no external force applied then acceleration will be zero, so velocity remain conserve.
Momentum = mass * velocity, if velocity don't Change momentum also not change.

MCQ : Force And Laws Of Motion - 1 - Question 8

The acceleration of an object is______.

A.
inversely proportional to its mass.
B.
directly proportional to the applied force.
C.
resisted by inertia.
D.
all of the above.

Detailed Solution: Question 8

Newton's second law of motion can be formally stated as follows:- The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

MCQ : Force And Laws Of Motion - 1 - Question 9

According to Newton's second law, force is the cause and the outcome is ______.

A. acceleration
B. velocity
C. momentum
D. time

Detailed Solution: Question 9

According to Newton's second law of motion, force applied to an object causes it to accelerate. The relationship is given by the formula: force = mass × acceleration. This means that acceleration is the direct result (outcome) of applying a force to an object, assuming the mass remains constant.

MCQ : Force And Laws Of Motion - 1 - Question 10

Which of the following is an equation of motion of a body?

A.
p = mv
B.
F = ma
C.
v = u + at
D.
Ft = mv - mu

Detailed Solution: Question 10

v = u +at is the only equation of motion present here in the options. Hence, C is the correct answer

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MCQ : Force And Laws Of Motion - 1 Class 9 Science MCQs & solutions - Free

MCQ Practice Test & Solutions: MCQ : Force And Laws Of Motion - 1 (10 Questions)

Newton’s third law of motion explains the two forces namely ‘action’ and ‘reaction’ coming into action when the two bodies are in contact with each other. These two forces:

The inertia of an object tends to cause the object ______.

While catching a stone thrown by your friend you pull the hands back to______.

Which one of the following statements is not correct for an object moving along a straight path in an accelerated motion?

The v - t graph of a body of 5 kg moving with the help of a force is shown. Then the force involved is______.

Force is defined as:

When no external force acts on an object, the physical quantity that remains conserved is______.

The acceleration of an object is______.

According to Newton's second law, force is the cause and the outcome is ______.

Which of the following is an equation of motion of a body?

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