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

maximum

zero

minimum

infinite

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

The net force on the car is zero

Both the acceleration and net force on the car point inward

Both the acceleration and net force on the car point outward

The car's acceleration is zero

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

increased friction

reduced friction

lower weight

high grip

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4. 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 tips towards the child who moved closer

The seesaw topples

The seesaw remains balanced

The seesaw tips towards the child who stayed further away

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

decrease with time

increases with time

is zero

first increase then decreases

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6. The centre of mass of a body:

lies always outside the body

may lie within, outside or on the surface

lies always on the surface of the body

lies always inside the body

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

zero

maximum

infinite

minimum

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8. 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

insert a pipe to increase length of spanner

use plastic and soft spanner

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

long and placed horizontally

short and placed vertically

long and placed vertically

short and placed horizontally

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10. 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

loses

not certain

gains

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11. A body in equilibrium must not have:

speed

quantity of motion

velocity

acceleration

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

the reaction of the ground

rolling friction between tyre and road

lack of sufficient centripetal force

gravitational force

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14. Moment of force is called:

couple arm

couple

moment arm

torque

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

between 1 N and 7N

5N

7N

1N

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

principle of moments

Newton's third law of motion

law of conservation of momentum

Newton's second law of motion

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

Snowflake > Raindrop > Hailstone

Hailstone > Raindrop > Snowflake

Raindrop > Snowflake > Hailstone

Raindrop = Snowflake = Hailstone

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

centripetal force

electrical force

friction

gravitational force

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19. Centripetal force is given by:

rFcosθ

mv²/r

mv/r²

rF

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

none of these three

stable equilibrium

unstable equilibrium

neutral equilibrium

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21. 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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22. 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

one fourth

remain the same

half

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

F sin60°

F tan60°

F

Fcos60°

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

at the lowest position

at the highest position

outside the body

at any position

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25. 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?

Lower in the water column

Unchanged from its position when thrown

Higher in the water column

At the same depth but slightly shifted horizontally

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Ch 4 Turning Effect of Force Short Questions