Home 9th Class Physics Notes Turning effect of Forces: 9th Class Physics Chapter 4 MCQs

Turning effect of Forces: 9th Class Physics Chapter 4 MCQs

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This post contains 9th Class Physics Notes of 4th Chapter. In this post you will find 9th Class physics Chapter 4 MCQs for students. Name of the 4th Chapter in the Physics of class 9 is “Turning Effect of Forces”. These Multiple Choice Questions are available here for Students to practice for exams.

Turning effect of Forces: 9th Class Physics Chapter 4 MCQs for Students

You may also like: MCQs of Chapter 3   –   MCQs of Chapter 5

1. The number of perpendicular components of a force is:

(a) 1
(b) 3
(c) 4
(d) 2

(d) 2 

2. A force of 10N is making an angle of 30° with horizontal. Its horizontal component will be:

(a) 4N
(b) 5N
(c) 7N
(d) 8.7N

(d) 8.7N 

3. Turning effect of a force is called:

(a) Torque
(b) Moment
(c) Couple
(d) Torque and momentum

(a) Torque 

4. If Fy = 4N and Fx = 3N, what is magnitude of resultant force:

(a) 7N
(b) 5N
(c) 12N
(d) 10N

(b) 5N 

5. First condition of equilibrium is:

(a) ΣF = 0
(b) Στ = 0
(c) ΣF = 0, Στ = 0
(d) All of These

(a) ΣF = 0 

6. Center of gravity of sphere is at:

(a) Centre of sphere
(b) Outside of sphere
(c) Radius of sphere
(d) none of these

(a) Centre of sphere 

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

(a) 2
(b) 3
(c) 4
(d) Any number

(d) Any number 

8. A body is in equilibrium when its:

(a) Acceleration is uniform
(b) Speed and acceleration are uniform
(c) Speed is uniform
(d) Acceleration is non-uniform

(c) Speed is uniform 

9. Formula for the direction of resultant force with the help of rectangular components.

(a) 𝛳 = tan-¹ fx/fy
(b) 𝛳 = tan-¹ fy/fx
(c) 𝛳 = sin-¹ fy/fx
(d) 𝛳 = cos-¹ fy/fx

(b) 𝛳 = tan-¹ fy/fx 

10. A force of 10N makes an angle of 90° with x-axis. Its horizontal component will be:

(a) 10N
(b) 5N
(c) Zero
(d) Maximum

(c) Zero 

11. The Conditions of equilibrium are:

(a) 1
(b) 2
(c) 3
(d) 4

(b) 2 

12. The states of equilibrium are:

(a) 1
(b) 2
(c) 3
(d) 4

(c) 3 

13. Complete equation Fᵧ/Fₓ = _________.

(a) sin 𝛳
(b) cos 𝛳
(c) tan 𝛳
(d) cosec 𝛳 

(d) cosec 𝛳  

14. Racing cars are made stable by:

(a) Increasing their speed
(b) Decreasing their speed
(c) Decreasing their width
(d) Lowering their centre of gravity

(d) Lowering their centre of gravity 

15. The direction of resultant vector can be found by:

(a) 𝛳 = tan fx/fy
(b) 𝛳 = tan fy/fx
(c) 𝛳 = tan-¹ fx/fy
(d) 𝛳 = tan-¹ fy/fx

(d) 𝛳 = tan-¹ fy/fx 

16. The value of gravitational acceleration “g” on the surface of moon is:

(a) 1.62 ms-²
(b) 3.7 ms-²
(c) 9.8 ms-²
(d) 10 ms-²

(a) 1.62 ms-² 

17. The value of “g” at a hight one Earth’s radius above the surface of the Earth is:

(a) 2 g
(b) 1/2 g
(c) 1/3 g
(d) 1/4 g

(d) 1/4 g 

9th Class Physics Chapter 4 Short Questions and Answers are also available.

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