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.
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) 2 [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) 8.7N [/bg_collapse]
3. Turning effect of a force is called:
(a) Torque
(b) Moment
(c) Couple
(d) Torque and momentum
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](a) Torque [/bg_collapse]
4. If Fy = 4N and Fx = 3N, what is magnitude of resultant force:
(a) 7N
(b) 5N
(c) 12N
(d) 10N
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](b) 5N [/bg_collapse]
5. First condition of equilibrium is:
(a) ΣF = 0
(b) Στ = 0
(c) ΣF = 0, Στ = 0
(d) All of These
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](a) ΣF = 0 [/bg_collapse]
6. Center of gravity of sphere is at:
(a) Centre of sphere
(b) Outside of sphere
(c) Radius of sphere
(d) none of these
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](a) Centre of sphere [/bg_collapse]
7. The number of forces that can be added by head to tail rule are:
(a) 2
(b) 3
(c) 4
(d) Any number
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) Any number [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](c) Speed is uniform [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](b) 𝛳 = tan-¹ fy/fx [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](c) Zero [/bg_collapse]
11. The Conditions of equilibrium are:
(a) 1
(b) 2
(c) 3
(d) 4
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](b) 2 [/bg_collapse]
12. The states of equilibrium are:
(a) 1
(b) 2
(c) 3
(d) 4
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](c) 3 [/bg_collapse]
13. Complete equation Fᵧ/Fₓ = _________.
(a) sin 𝛳
(b) cos 𝛳
(c) tan 𝛳
(d) cosec 𝛳
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) cosec 𝛳 [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) Lowering their centre of gravity [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) 𝛳 = tan-¹ fy/fx [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](a) 1.62 ms-² [/bg_collapse]
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
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Hide Answer” ](d) 1/4 g [/bg_collapse]
