Punjab 9th Physics Ch 4 Turning Effect of Force Online Test Mcqs

Punjab Physics 9th Class: Chapter 4

Understand the principles of rotational motion in Chapter 4: Turning Effect of Force with our Punjab Board 9th Class Physics online resources (New Syllabus 2025-26). This chapter introduces torque, moment of force, principle of moments, equilibrium conditions, center of mass, center of gravity, and stability concepts. Our New Pattern MCQs Online Test features questions on clockwise/anticlockwise moments, equilibrium types, and practical applications of torque. The Short Questions with Answers section explains key concepts like parallel forces, rectangular components, and conditions for equilibrium with clear diagrams and examples. Practice regularly to master rotational dynamics and excel in your Punjab Board Physics examinations with confidence and conceptual clarity.

Punjab 9th Physics Ch 4 Turning Effect of Force Mcqs Online Test (New Syllabus)

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1. A particle is simultaneously acted upon by two forces of 4 and 3 newtons. The net force on the particle is:

7N

1N

5N

between 1 N and 7N

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2. A shopkeeper sells his articles by a balance having unequal arms of the pans. If he puts the weights in the pan having shorter arm, then the customer:

neither loses nor gains

gains

not certain

loses

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3. A uniformly rotating fan is said to be in:

not in equilibrium

dynamic equilibrium only

both in static and dynamic equilibrium

static equilibrium only

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4. In stable equilibrium the centre of gravity of the body lies:

at any position

at the highest position

at the lowest position

outside the body

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5. A car drives at steady speed around a perfectly circular track:

Both the acceleration and net force on the car point inward

Both the acceleration and net force on the car point outward

The net force on the car is zero

The car's acceleration is zero

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6. The reason that a car moving on a horizontal road gets thrown out of the road while taking a turn is:

rolling friction between tyre and road

lack of sufficient centripetal force

gravitational force

the reaction of the ground

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7. It is more difficult to walk on a slippery surface than on a non-slippery one because of:

lower weight

reduced friction

increased friction

high grip

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8. Centripetal force is given by:

rFcosθ

mv²/r

rF

mv/r²

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9. If a body is at rest or moving with uniform rotational velocity, then torque acting on the body will be:

zero

maximum

infinite

minimum

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10. For an object moving with terminal velocity, its acceleration:

is zero

decrease with time

increases with time

first increase then decreases

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11. A force F is making an angle of 60° with x-axis. Its y-component is equal to:

F tan60°

F

F sin60°

Fcos60°

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12. A satellite of mass 'm' is revolving around the earth with an orbital speed 'v'. If mass of the satellite is doubled, its orbital speed will become:

double

remain the same

one fourth

half

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13. You throw a weighted fishing net into a calm lake. As the net sinks, it opens fully underwater, spreading out its mesh evenly. Compared to the moment it left your hand, where is the net's center of mass now?

At the same depth but slightly shifted horizontally

Higher in the water column

Lower in the water column

Unchanged from its position when thrown

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14. A man walks on a tight rope. He balances himself by holding a bamboo stick horizontally. It is an application of:

Newton's second law of motion

Newton's third law of motion

principle of moments

law of conservation of momentum

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15. The centre of mass of a body:

may lie within, outside or on the surface

lies always inside the body

lies always on the surface of the body

lies always outside the body

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16. A body in equilibrium must not have:

speed

acceleration

quantity of motion

velocity

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17. Moment of force is called:

moment arm

torque

couple

couple arm

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18. The force that always changes direction of velocity and not its magnitude is called:

electrical force

centripetal force

friction

gravitational force

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19. The correct order of comparison for the terminal speeds of a raindrop, snowflake, and hailstone is:

Hailstone > Raindrop > Snowflake

Raindrop > Snowflake > Hailstone

Snowflake > Raindrop > Hailstone

Raindrop = Snowflake = Hailstone

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20. A seesaw balances perfectly with two children of equal weight sitting at equal distances from the fulcrum. If one child moves closer to the fulcrum:

The seesaw remains balanced

The seesaw tips towards the child who moved closer

The seesaw topples

The seesaw tips towards the child who stayed further away

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21. You are trying to loosen a nut using a spanner, but it is not working. In order to open the nut, you need to:

use a spanner of small length

tie a rope with spanner

use plastic and soft spanner

insert a pipe to increase length of spanner

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22. When line of action of the applied force passes through its pivot point then moment of force acting on the body is:

zero

minimum

infinite

maximum

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23. A cylinder resting on its circular base is in:

none of these three

unstable equilibrium

stable equilibrium

neutral equilibrium

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24. A tightrope walker is carrying a long pole while walking across a rope. The stability of the walker is affected if the pole is:

short and placed vertically

long and placed horizontally

short and placed horizontally

long and placed vertically

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25. If F1 and F2 are the force acting on a body and τ is the torque produced in it, the body will be completely in equilibrium, when:

ΣF=0 and Στ=0

ΣF=0 and Στ≠0

ΣF≠0 and Στ=0

ΣF≠0 and Στ≠0

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Ch 4 Turning Effect of Force Short Questions