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

product of force and time

none of these

time interval

magnitude of force

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

force

weight

size

mass

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

0N

10N

25N

5N

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

centripetal force

electrostatic force

gravitational force

frictional force

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5. N kg⁻¹ is equivalent to:

kg ms⁻²

kg ms⁻¹

ms⁻¹

ms⁻²

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

size

momentum

weight

velocity

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7. The force which moves the car is:

Water split on the road

Force developed by engine

Force of friction between road tyre

uniform velocity

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

Electrostatic force

Tension in the string

Air resistance

Friction

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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:

Inertia of water

Action and Reaction balance each other

Weight of water

Centrifugal force on water

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

zero

Weight of the body

difference of weight of body and air resistance on it

air resistance on the body

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12. 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

-10N

5N

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13. 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

2N

50N

25N

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

force

(force)(time)

(force)(velocity)

(mass)(time)

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

9.8N

100N

1N

any value

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

50

0.5

2

5

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

the resultant force is at right angle to its tangential velocity

the resultant force on it begins to decrease

the resultant force on it begins to increase

the resultant force on it is zero

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

velocity

inertia

momentum

reaction

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

first

second

third

fourth

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20. Conservation of linear momentum is equivalent to:

None of these

Newton's second law of motion

Newton's first law of motion

Newton's third law of motion

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21. 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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22. 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

Inertia of dust

Action force on carpet

Reaction force by carpet

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23. SI unit of linear momentum is:

kg m²s⁻¹

kg m⁻¹s⁻¹

Nm

kg ms⁻¹

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

prevents direct contact of the surfaces

acts as ball bearings

provides rolling friction

decreases temperature

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Physics Ch 3 Dynamics Short Questions