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

the resultant force on it begins to decrease

the resultant force on it is zero

the resultant force on it begins to increase

the resultant force is at right angle to its tangential velocity

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

prevents direct contact of the surfaces

decreases temperature

acts as ball bearings

provides rolling friction

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

difference of weight of body and air resistance on it

air resistance on the body

Weight of the body

zero

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

weight

force

mass

size

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5. 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

time interval

none of these

product of force and time

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6. N kg⁻¹ is equivalent to:

ms⁻²

kg ms⁻²

ms⁻¹

kg ms⁻¹

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

Air resistance

Electrostatic force

Tension in the string

Friction

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

5

0.5

2

50

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9. 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' = 2p

p' = -2p

p' = -p

p' = p

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

Weight of water

Centrifugal force on water

Inertia of water

Action and Reaction balance each other

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11. Conservation of linear momentum is equivalent to:

Newton's third law of motion

Newton's second law of motion

Newton's first law of motion

None of these

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12. 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:

50N

25N

100N

2N

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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

Inertia of dust

Reaction force by carpet

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

second

fourth

third

first

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

velocity

momentum

inertia

reaction

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16. 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:

-10N

5N

-15N

-12N

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

any value

9.8N

100N

1N

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

frictional force

gravitational force

electrostatic force

centripetal force

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19. SI unit of linear momentum is:

kg ms⁻¹

kg m²s⁻¹

Nm

kg m⁻¹s⁻¹

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20. The force which moves the car is:

Force developed by engine

uniform velocity

Force of friction between road tyre

Water split on the road

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

10N

5N

0N

25N

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22. 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:

-1/2

0

-v

v

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

(force)(time)

force

(mass)(time)

(force)(velocity)

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

momentum

size

velocity

weight

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Physics Ch 3 Dynamics Short Questions