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9th Class Physics Chapter 4 Turning Effect of Forces English Medium KPK Boards Online Mcqs MCQs With Answers

Question # 1

If Fx and Fy are rectangular components of vector F, then its direction is determined by the relation

Choose an answer

θ = sin-1 Fv/Fx

θ = tan-1 Fx/Fy

θ = tan Fx/Fy

θ = tan Fy/Fx

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Question # 2

The product of force and momentum arm is called:

Choose an answer

Couple arm

Torque

Rigid body

Axis of rotation

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Question # 3

When equal opposite forces are added then the resultant force is ______________

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Double

Triple

Zero

None of these

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Question # 4

Anticlockwise torque is taken:

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Negative

Neutral

Positive

Nil

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Question # 5

If force is capable of rotation a body in clockwise direction it is :`

Choose an answer

Clockwise

Anticlockwise

It has no direction

Nil

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Question # 6

The resultant vector of given vectors A and B is

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Question # 7

The measure of an object tendency to rotate about same axis is :

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Force

Moment arm

Torque

None of these

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Question # 8

Center of gravity of an irregular shaped body can be found with help of:

Choose an answer

Screw guage

Plumbline

Meter rode

Wedge

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Question # 9

A body is said to be in __________ equilibrium if after a slight tilt return to its previous position:

Choose an answer

Stable

Unstable

Neutral

None

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Question # 10

If base of a right angle triangle is 3 cm and perpendicular is 4 cm. What is length of perpndicular?

Choose an answer

3 cm

2 cm

5 cm

10 cm

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Question # 11

Cos 0^ois

Choose an answer

0.5

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Question # 12

The number of forces that can be added by head to tail rule are

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Any Number

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Question # 13

Parallel forces are those whose:

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^{Times of action are parallel}

Points of action are different

More than one forces

All of the given option

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