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

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In this post, I am sharing 9th Class Physics Chapter 4 MCQs for students as a quiz. So, if you have reached here looking for 9th Class Physics Notes of 4th Chapter, you are at the exact post. Chapterwise 9th Class Physics MCQs are also available, so you could reach notes of all chapters. Turning Effect of Forces is the name of 4th Chapter in Class 9 Physics book. I have taken these Class 9 physics Chapter 4 MCQs with Answers from Al-Hassan Super Notes Physics (English Medium) – IX.. Students can practice these Multiple Choice Questions before participating exams.

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

You should also visit: 9th Class Physics Chapter 4 Short Questions and Answers

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