Physics Test | Class 9 Physics

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Class: 9th
Subject: Physics (SNC)
Chapter: Turning Effects of Force

Test Date: Current Date
Time Allowed: 60 minutes
Total Marks: 40
Paper Type: Objective + Subjective

Multiple Choice Questions (10×1 = 10 Marks)

1. Moment of force is called:
   (A) Moment arm
   (B) Couple
   (C) Couple arm
   (D) Torque
2. A cylinder resting on its circular base is in:
   (A) Stable equilibrium
   (B) Unstable equilibrium
   (C) Neutral equilibrium
   (D) None of these
3. Unlike parallel forces balance when:
   (A) Equal in magnitude
   (B) Unequal in magnitude
   (C) Perpendicular
   (D) Parallel
4. Forces can be added using:
   (A) Triangle law
   (B) Parallelogram law
   (C) Polygon law
   (D) All of these
5. Two forces of 5N and 12N act perpendicular to each other. The resultant force is:
   (A) 13N
   (B) 17N
   (C) 25N
   (D) 36N
6. A force of 20N acts at an angle of 45° to the horizontal. The horizontal component of the force is:
   (A) 10N
   (B) 14.14N
   (C) 20N
   (D) 28.28N
7. What is the unit of moment?
   (A) Newton
   (B) Newton-meter
   (C) Joule
   (D) Watt
8. What happens when the net force on an object is not zero?
   (A) It remains at rest
   (B) It moves with constant velocity
   (C) It accelerates
   (D) None of these
9. What is the state of equilibrium of a car moving with constant velocity?
   (A) Static
   (B) Dynamic
   (C) Stable
   (D) None of these
10. A body is in equilibrium when:
    (A) Net force is zero
    (B) Net torque is zero
    (C) Both A and B
    (D) None of these

Short Answer Questions (15×2 = 30 Marks)

Answer the following questions briefly.

1. Why an accelerated body cannot be considered in equilibrium?

2. What are like parallel forces?

3. When forces acting at an angle, how are they added?

4. When is the resultant force maximum?

5. What is rigid body?

6. What is axis of rotation?

7. What is Turning effect?

8. What are the components of a vector?

9. What are perpendicular or rectangular components of forces?

10. What is the process of breaking a vector into its components called?
11. How many components can a vector be resolved into?
12. Can a vector be resolved into more than two components?
13. What are the perpendicular components of a force called?
14. What is the condition for a body to be in rotational equilibrium in terms of moments?
15. Define second condition of equilibrium.
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Numerical & Detailed Answer Questions (Answer any 2) (2×5 = 10 Marks)

1. A see-saw is balanced with two children sitting near either end. Child A weighs 30kg and sits 2 metres away from the pivot, while child B weighs 40kg and sits 1.5 metres from the pivot.
   Calculate the total moment on each side and determine if the see-saw is in equilibrium.
   Solution:

2. Give applications of stability in real life with examples.
   Answer:

3. A 150g stone attached to a string is whirled in a horizontal circle at a constant speed of 8 m/s. The length of string is 1.2m. Calculate the centripetal force acting on the stone. Neglect effects of gravity.
   Solution:

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