Punjab 9th Physics Ch 3 Dynamics Online Test Mcqs

Punjab Physics 9th Class: Chapter 3

Explore the fascinating world of forces and motion in Chapter 3: Dynamics with our Punjab Board 9th Class Physics practice resources (New Syllabus 2025-26). This chapter covers Newton’s Laws of Motion, momentum, impulse, friction, circular motion, and the relationship between force and acceleration.

Our New Pattern MCQs Online Test includes conceptual and application-based questions on inertia, action-reaction pairs, conservation of momentum, and types of friction. The Short Questions with Answers section provides clear explanations of dynamics principles with real-life examples. Practice chapter-wise to develop strong analytical skills and master the laws governing motion. Perfect for students aiming for top grades in Punjab Board Physics examinations.

Punjab 9th Physics Ch 3 Dynamics Mcqs Online Test (New Syllabus)

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1. A book of mass 5 kg is placed on the table, the magnitude of net force acting on the book is:

25N

5N

10N

0N

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2. A large force acts on an object for a very short interval of time. In this case, it is easy to determine:

magnitude of force

none of these

product of force and time

time interval

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3. Change in momentum of a body is equal to:

(force)(velocity)

(force)(time)

force

(mass)(time)

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4. An object with a mass 5 kg moves at constant velocity of 10 ms⁻¹. A constant force then acts for 5 seconds on the object and gives it a velocity of 2 ms⁻¹ in the opposite direction. The force acting on the object is:

-12N

-15N

5N

-10N

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5. A force of 5N is applied to a body weighing 10N. Its acceleration in m/s² is:

50

0.5

5

2

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6. N kg⁻¹ is equivalent to:

ms⁻²

kg ms⁻²

kg ms⁻¹

ms⁻¹

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7. At the fairground, the force that balances your weight is:

frictional force

electrostatic force

centripetal force

gravitational force

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8. When we kick a stone, we get hurt. This is due to:

inertia

momentum

reaction

velocity

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9. Net force on the body falling in air with uniform velocity is equal to:

zero

Weight of the body

air resistance on the body

difference of weight of body and air resistance on it

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10. A particle of mass m moving with a velocity v collides with another particle of the same mass at rest. The velocity of the first particle after collision is:

v

-v

-1/2

0

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11. Inertia of a body is related to which of the following quantities:

weight

size

force

mass

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12. An object of mass 1 kg placed at earth's surface experiences a force of:

100N

any value

9.8N

1N

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13. When a hanging carpet is beaten by stick, Dust flies off the carpet. It is mainly due to:

Rate of change of momentum of carpet

Action force on carpet

Reaction force by carpet

Inertia of dust

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14. A bucket having some water is revolved in vertical circle. Water does not spill out, even the bucket is upside down, due to:

Centrifugal force on water

Inertia of water

Weight of water

Action and Reaction balance each other

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15. A force acts on a body for 2 seconds and it produces 50 kg m/s change in its momentum. The force acting on the body is:

100N

50N

25N

2N

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16. An object will continue its motion with constant acceleration until:

the resultant force on it is zero

the resultant force on it begins to increase

the resultant force on it begins to decrease

the resultant force is at right angle to its tangential velocity

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17. Which of the following is a non-contact force?

Electrostatic force

Air resistance

Friction

Tension in the string

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18. The force which moves the car is:

Water split on the road

Force developed by engine

uniform velocity

Force of friction between road tyre

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19. Conservation of linear momentum is equivalent to:

Newton's third law of motion

Newton's first law of motion

None of these

Newton's second law of motion

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20. A lubricant is usually introduced between two surfaces to decrease friction. The lubricant:

acts as ball bearings

provides rolling friction

decreases temperature

prevents direct contact of the surfaces

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21. The rate of change of momentum of free falling body is equal to its:

weight

size

velocity

momentum

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22. SI unit of linear momentum is:

kg m²s⁻¹

kg ms⁻¹

kg m⁻¹s⁻¹

Nm

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23. Thrust force is a consequence of which law of motion:

second

first

third

fourth

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24. A ball with initial momentum p hits a solid wall and bounces back with the same velocity. Its momentum p' after collision will be:

p' = -p

p' = p

p' = 2p

p' = -2p

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Physics Ch 3 Dynamics Short Questions