1. The turning effect of a force is called:
A) Momentum
B) Torque
C) Pressure
D) Velocity
2. Torque is also known as the:
A) Moment of force
B) Gravitational force
C) Linear momentum
D) Elastic force
3. The SI unit of torque is:
A) Joule
B) Pascal
C) Watt
D) Newton meter (
)
4. Torque is calculated by:
5. The perpendicular distance from the pivot to the line of action of force is called:
A) Moment arm
B) Radius
C) Diameter
D) Lever length
6. The point about which a body turns is called the:
A) Centre of gravity
B) Pivot
C) Fulcrum force
D) Axis length
7. A couple consists of:
A) Two equal forces in the same direction
B) Two unequal parallel forces
C) Three equal forces
D) Two equal and opposite parallel forces acting along different lines
8. The SI unit of moment arm is:
A) Newton
B) Joule
C) Meter (
)
D) Kilogram
9. If a force of 
acts at a perpendicular distance of 
, the torque is:
10. Rotational equilibrium exists when the:
A) Sum of all forces is maximum
B) Sum of clockwise moments equals the sum of anticlockwise moments
C) Object is moving with constant speed
D) Net force is always zero only
11. Which of the following is an example of a first-class lever?
A) Wheelbarrow
B) Nutcracker
C) Tweezers
D) Seesaw
12. The centre of mass of a uniform rectangular sheet lies at its:
A) Geometrical centre
B) Top edge
C) Bottom edge
D) Left corner
13. A body is in stable equilibrium if, after a slight displacement, it:
A) Moves farther away
B) Remains in the new position
C) Returns to its original position
D) Rotates continuously
14. The stability of an object increases when its centre of gravity is:
A) Raised
B) Lowered
C) Removed
D) Shifted sideways only
15. Which condition is necessary for translational equilibrium?
A) Net torque must be maximum
B) Clockwise moments exceed anticlockwise moments
C) Object must rotate uniformly
D) Resultant force acting on the body is zero
16. A door handle is fixed far from the hinges to:
A) Increase the turning effect for the same force
B) Reduce the weight of the door
C) Increase friction
D) Decrease the width of the door
17. If the perpendicular distance becomes zero, the torque produced by a force is:
A) Maximum
B) Equal to the force
C) Zero
D) Infinite
18. A force of 
acts at a perpendicular distance of 
from the pivot. The torque produced is:
19. The principle of moments states that for equilibrium:
A) Clockwise moments are always greater
B) Anticlockwise moments are always greater
C) Resultant force must be maximum
D) Sum of clockwise moments equals sum of anticlockwise moments
20. Which class of lever has the fulcrum between the effort and the load?
A) First-class lever
B) Second-class lever
C) Third-class lever
D) Hydraulic lever
21. A wheelbarrow is an example of a:
A) First-class lever
B) Third-class lever
C) Second-class lever
D) Fixed pulley
22. Tweezers are an example of a:
A) First-class lever
B) Third-class lever
C) Second-class lever
D) Inclined plane
23. A couple produces:
A) Only linear motion
B) Zero turning effect
C) Only translational motion
D) Rotation without translation
24. If the force acting on a lever is doubled while the moment arm remains constant, the torque will:
A) Double
B) Become half
C) Remain unchanged
D) Become four times
25. Which of the following improves the stability of a vehicle?
A) Raising its centre of gravity
B) Narrowing its base
C) Lowering its centre of gravity and widening its base
D) Reducing its mass only
26. The centre of gravity of a uniform sphere is located at its:
A) Surface
B) Centre
C) Top
D) Bottom
27. If the line of action of weight falls outside the base of support, the body will:
A) Topple over
B) Become more stable
C) Remain in equilibrium
D) Float
28. Which condition is necessary for complete equilibrium of a rigid body?
A) Only translational equilibrium
B) Only rotational equilibrium
C) Constant velocity only
D) Both translational and rotational equilibrium
29. The turning effect produced by a couple depends upon:
A) The mass of the body only
B) Gravity only
C) One of the forces and the perpendicular distance between them
D) The colour of the body
30. Which equilibrium is shown by a ball resting at the bottom of a bowl?
A) Neutral equilibrium
B) Stable equilibrium
C) Unstable equilibrium
D) Dynamic equilibrium
31. Which equilibrium is shown by a ball balanced on top of a hill?
A) Stable equilibrium
B) Neutral equilibrium
C) Rotational equilibrium
D) Unstable equilibrium
32. The centre of gravity of a freely suspended object lies:
A) Vertically below the point of suspension
B) Above the point of suspension
C) At the edge of the object
D) Outside the object in every case
33. If the moment arm is halved while the force remains constant, the torque will:
A) Double
B) Become four times
C) Become half
D) Remain unchanged
34. The SI unit is commonly used to measure:
A) Pressure
B) Torque
C) Power
D) Momentum
35. Which of the following is an example of a first-class lever?
A) Scissors
B) Wheelbarrow
C) Tweezers
D) Human forearm
36. The mechanical advantage of a lever can be increased by:
A) Decreasing the effort arm
B) Increasing the effort arm
C) Increasing the load arm
D) Reducing the applied force to zero
37. A body is in neutral equilibrium if, after a slight displacement, it:
A) Returns to its original position
B) Moves farther away from its original position
C) Starts rotating continuously
D) Remains in its new position
38. Which of the following is in neutral equilibrium?
A) A cone standing on its base
B) A ball on top of a hill
C) A smooth sphere resting on a horizontal surface
D) A pendulum at its lowest position
39. If a force acts through the pivot point, the resulting torque is:
A) Maximum
B) Zero
C) Equal to the force
D) Infinite
40. A mechanic uses a long spanner instead of a short one because it:
A) Produces greater torque for the same applied force
B) Increases the weight of the nut
C) Reduces the applied force to zero
D) Eliminates friction completely
41. If 
and the perpendicular distance is 
, the applied force is:
42. Which quantity is essential for producing torque?
A) Density
B) Volume
C) Perpendicular distance from the pivot
D) Temperature
43. A balanced beam supported at its centre is in:
A) Unstable equilibrium
B) Rotational equilibrium
C) Circular motion
D) Accelerated motion
44. Tightrope walkers often use a long balancing pole to:
A) Increase stability by lowering the effective centre of gravity
B) Increase their weight
C) Increase friction with the rope
D) Reduce gravitational force
45. Which statement about a couple is correct?
A) It produces only linear motion
B) It consists of two unequal forces
C) Its resultant force is non-zero
D) It produces rotation without a resultant force
46. To maximize the turning effect, a force should be applied:
A) Parallel to the lever arm
B) Through the pivot
C) Perpendicular to the lever arm
D) Along the axis of rotation
47. If clockwise moments exceed anticlockwise moments, the body will rotate:
A) Clockwise
B) Anticlockwise
C) It will remain balanced
D) It will move linearly only
48. The centre of gravity of a regular, uniform object generally lies:
A) At its top
B) At its geometrical centre
C) Outside the object
D) At its lowest point
49. A body has complete equilibrium when:
A) Only the net force is zero
B) Only the net torque is zero
C) It is moving with constant speed
D) Both the resultant force and resultant torque are zero
50. The turning effect of forces is mainly applied in the design and operation of:
A) Thermometers only
B) Electric bulbs only
C) Levers, spanners, steering wheels, and door handles
D) Magnets only
