1 The perpendicular distance from the pivot to the line of action of force is called: A Moment arm B Force arm C Couple arm D Torque arm
2 Which pair of forces is an example of unlike parallel forces? A Two forces of 10 N and 5 N acting to the right B Two forces of 10 N acting upward C A force of 10 N to the right and a force of 5 N to the left D Two forces of 5 N acting downward
3 The perpendicular distance from the pivot to the line of action of a force is called the: A Moment arm B Force arm C Load arm D Effort arm
4 A force of 20 N makes an angle of 60° with the x-axis. Its x-component is: A 10 N B 17.3 N C 20 N D 40 N
6 A force of 50 N makes an angle of 30° with the horizontal. Its vertical component is: A 25 N B 43.3 N C 50 N D 100 N
7 If the centre of gravity of a body is raised, its stability: A Increases B Decreases C Remains the same D Becomes neutral
8 Which of the following is an example of neutral equilibrium? A A ball placed at the bottom of a bowl B A ball placed on a flat horizontal surface C A cone balanced on its tip D A book placed on a table
10 A force of 20 N acts at a perpendicular distance of 0.5 m from a pivot. What is the moment of the force? A 40 N m B 10 N m C 20.5 N m D 0.025 N m
11 Which of the following is an example of a couple? A Two equal and opposite forces acting along the same line B Two equal and opposite forces acting along different parallel lines C Two unequal forces acting in the same direction D A single force acting at a point
12 The stability of a body can be improved by: A Raising its centre of gravity and narrowing its base B Lowering its centre of gravity and widening its base C Raising its centre of gravity and widening its base D Lowering its centre of gravity and narrowing its base
13 According to the principle of moments, for a body in equilibrium, the sum of clockwise moments about a pivot is: A Greater than the sum of anticlockwise moments B Less than the sum of anticlockwise moments C Equal to the sum of anticlockwise moments D Always zero
14 Which of the following is an example of dynamic equilibrium? A A book lying on a table B A car moving with constant velocity on a straight road C A hanging picture on a wall D A pendulum at its extreme position
15 A see-saw is balanced when a 30 N weight is placed 2 m from the pivot on one side. How far from the pivot should a 20 N weight be placed on the other side to balance it? A 1 m B 2 m C 3 m D 4 m
16 To improve the stability of a racing car, its centre of gravity should be: A As high as possible B As low as possible C At the front end D At the rear end
17 In a see-saw, a 30 kg child sits 2 m from the pivot. To balance it, a 60 kg child should sit at: A 0.5 m B 1 m C 2 m D 4 m
18 The centre of gravity of a triangular lamina is located at the intersection of its: A Sides B Altitudes C Medians D Angles
19 The centre of gravity of a uniform meter rod lies at: A 10 cm mark B 50 cm mark C 90 cm mark D 100 cm mark
20 The moment of a force is directly proportional to: A The magnitude of the force only B The moment arm only C The product of force and moment arm D The sum of force and moment arm
21 A body is in dynamic equilibrium when it is: A At rest B Moving with constant velocity C Accelerating D Rotating with constant angular acceleration
22 Two forces of 5 N and 3 N act in the same direction on a body. What is the magnitude of their resultant? A 2 N B 8 N C 15 N D 0 N
23 The centre of gravity of a uniform metre rod is located at: A One end of the rod B The 25 cm mark C The 50 cm mark D The 75 cm mark
24 Racing cars are designed with a low centre of gravity mainly to: A Increase their speed B Improve their stability C Reduce their mass D Increase their fuel efficiency
25 A body is in stable equilibrium when its centre of gravity is: A Raised on slight displacement B Lowered on slight displacement C Unchanged on slight displacement D Shifted outside the base