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| 01 | 9th Class Physics Mcqs Chapter 01 | 02 | 9th Class Physics Mcqs Chapter 02 |
| 03 | 9th Class Physics Mcqs Chapter 03 | 04 | 9th Class Physics Mcqs Chapter 04 |
| 05 | 9th Class Physics Mcqs Chapter 05 | 06 | 9th Class Physics Mcqs Chapter 06 |
| 07 | 9th Class Physics Mcqs Chapter 07 | 08 | 9th Class Physics Mcqs Chapter 08 |
| 09 | 9th Class Physics Mcqs Chapter 09 | 10 | 9th Class Physics Mcqs Chapter 10 |
| 11 | 9th Class Physics Mcqs Chapter 11 | 12 | 9th Class Physics Mcqs Chapter 12 |
CHAPTER 4
TURNING EFFECTS OF FORCE
Encircle the most appropriate answer from the following options :
1. If a number Of forces act on a body such that their points of action are different but lines of action are parallel to each other then these forces are known as forces:
(a) Same
(b) Parallel
(c) Perpendicular
(d) None of above
2. If the direction of parallel forces is the same, then these are called forces:
(a) Same
(b) Like Parallel
(c) Unlike Parallel
(d) All of above
3. If the direction of parallel forces is the opposite, then these are called forces:
(a) Same
(b) Like Parallel
(c) Unlike Parallel
(d) All of above
4. Addition of vectors are done by:
(a) Head to tail rule
(b) Left hand rule
(c) Right hand rule
(d) None of above
5. Component of a vector acting along the x — axis is called:
(a) x — component
(b) horizontal component
(c) vertical component
(d) both a and b
6. component of a vector acting along the y — axis is called:
(a) x — component
(b) horizontal component
(c) vertical component
(d) both a and b
7. Value of sin 300 :
(a) 0.5
(b) 0.866
(c) 0 707
(d) none of them
8. During the rotation the particles of the body rotate along fixed circles. The straight line joining the centres of these circles is called :
(a) Parallel line
(b) Axis of rotation
(c) Both a & b
(d) None Of above
9. The rotational effect of a body is measured by a quantity known as:
(a) Acceleration
(b) Velocity
(c) Displacement
(d) Torque
10. The rotation produced in a body depends upon __ factors:
(a) 1
(b) 2
(c) 3
(d) 4
11. Torque is a quantity:
(a) Base
(b) Vector
(c) Scalar
(d) Both a & b
12. The direction of torque is determined by:
(a) Left hand
(b) Right handrule
(c) Both a & b
(d) None of above
13. If the rotation produced in anticlockwise direction then the torque is taken as:
(a) Positive
(b) Negative
(c) Opposite
(d) Perpendicular
14. If the rotation is produced in clock wise direction then the torque is taken as:
(a) Positive
(b) Negative
(c) Opposite
(d) Perpendicular
15. According to right hand rule, if is along the curl of the fingers of the right hand then the thumb points in the direction of the torque:
(a) Rotation
(b) Parallel
(c) Force
(d) Weight
16. In System International, the unit of torque is:
(a) N
(b) Nm-2
(c) Nm2
(d) Nm
17. The force which is acting perpendicularly downwards towards the earth is called:
(a) Torque
(b) Weight
(c) Force of gravity
(d) Both b & c
18. The point at which whole weight of the body appears to act is called:
(a) Origin
(b) Couple
(c) Centre of Gravity
(d) Reference point
19. The position of the centre of gravity depends upon the of the body:
(a) Size
(b) Shape
(c) Weight
(d) Force
20. The centre of gravity of parallelogram, rectangle, square is the:
(a) Point of intersection of the medians
(b) Central point of axis
(c) Point of intersection of the diagonals
(d) Centre of parallelogram
21. The centre of gravity of a regular shaped body is always on its centre of —————–:
(a) Body
(b) Symmetry
(c) Medians
(d) Axis
22. The centre of gravity of triangle is the:
(a) Point of intersection of the medians
(b) Central point of axis
(c) Point of intersection of the diagonals
(d) Centre of parallelogram
23. The centre of gravity of cylinder is the:
(a) Point of intersection of the medians
(b) Central point of axis
(c) Point of intersection of the diagonals
(d) Centre of parallelogram
24. When two equal, opposite and parallel forces act at two points of the same body, they form a:
(a) Torque
(b) Moment of a couple
(c) Force
(d) Couple
25. is always acting while opening or closing water tap, a lock, stopper of a bottle or jar:
(a) Couple
(b) Weight
(c) Force
(d) Mass
26. The perpendicular distance between the line of action of force and centre of rotation and denoted by ‘r’ is called:
(a) Centre of gravity
(b) Moment arm
(c) Displacement
(d) Force
27. The torque produced in a body due to a couple is equal to the product of one of the forces and the
(a) Couple
(b) Force
(c) Like parallel force
(d) Couple arm
28. There are conditions of equilibrium:
(a) 1
(b) 2
(c) 3
(d) 4
29. When the sum of all the force acting on a body is zero or the object is moving with uniform velocity then it will be in
(a) Rest
(b) Motion
(c) Equilibrium
(d) None of above
30. According to First condition of equilibrium, the total of all the forces acting on the body should be —
(a) Positive
(b) Zero
(c) None
(d) All of above
31. According to Second condition of equilibrium, the sum of all the torques acting on the body should be — —
(a) Positive
(b) Zero
(c) None
(d) All of above
32. Sigma (E) is the Greek letter which is used to represent:
(a) Addition
(b) Subtraction
(c) Multiplication
(d) Division
33. There are ——-——- states of equilibrium:
(a) 1
(b) 2
(c) 3
(d) 4
34. The equilibrium in which the body conics back to its original condition when sct free after slightly lifting frotn one side is — equilibrium:
(a) Stable
(b) Unstable
(c) Neutral
(d) None of’ above
35. The equilibrium in which the body does not conue back to its original condition when set free after slightly lifting front one side is equilibrium:
(a) Stable
(b) Unstable
(c) Neutral
(d) None of above
36. The type of equilibrium in which after disturbance, the body again conies to rest position and center of gravity remains unchanged:
(a) Stable
(b) Unstable
(c) Neutral
(d) None of above
37. In Stable equilibrium, the centre of gravity ——- than (he original position:
(a) Raised
(b) Lowered
(c) Reina In satna
(d) All of above
38. In Unstable equilibrium, the centre of gravity is than the original position:
(a) Raised
(b) Lowered
(c) Remain satne
(d) All or above
39. In Neutral equilibrium, the centre of gravity than..? original position:
(a) Raised
(b) Lowered
(c) Retnain sallie
(d) All of above
40. When an object is resting on the smooth horizontal surface, the weight or the object is balanced by –
(a) Nonnal Reaction
(b) Torque
(c) Friction
(d) Couple
41. A meter rod on a wedge is an example of what in equilibrium
(a) Stable
(b) Unstable
(c) Neutral
(d) None
42. A book lying on the table is an example of equilibrium:
(a) Stable
(b) Unstable
(c) Neutral
(d) None of above
43. Motion of the football on the ground is an example of ——- equilibrium:
(a) Stable
(b) Unstable
(c) Neutral
(d) None of above
44. The _ of a racing car is kept low to make its stable:
(a) Width
(b) Height
(c) Length
(d) Weight
45. If the centre of gravity of the body is below the fulcrum then the body will be in equilibrium:
(a) Stable
(b) Unstable
(c) Neutral
(d) None of above