1 The second condition of equilibrium states that: A Net force is zero B Net torque is zero C Net force is maximum D Net torque is maximum
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 In a simple pendulum, the energy at the mean position is mostly: A Potential energy B Kinetic energy C Chemical energy D Nuclear energy
4 According to the principle of moments, for a body in equilibrium: A Clockwise moments are greater than anticlockwise moments B Anticlockwise moments are greater than clockwise moments C Clockwise moments equal anticlockwise moments D Sum of all moments is maximum
5 According to the principle of moments, a body is in equilibrium when: A Clockwise moment is greater than anticlockwise moment B Anticlockwise moment is greater than clockwise moment C Sum of clockwise moments equals sum of anticlockwise moments D Both moments are zero only
6 If a machine has an efficiency of 80%, it means: A 80% of input energy is wasted B 80% of input energy is converted into useful output C The machine produces more energy than it takes in D The machine has no energy loss
8 If the centre of gravity of a body is raised, its stability: A Increases B Decreases C Remains the same D Becomes neutral
9 Efficiency of a machine is given by: A Output energy / Input energy × 100 B Input energy / Output energy × 100 C Work / Time D Force × Distance
10 When a car takes a turn, the centripetal force is provided by: A The engine B The friction between the tyres and the road C The weight of the car D The air resistance
11 The work done by a force can be calculated from a force-displacement graph as: A Slope of the graph B Area under the graph C Y-intercept of the graph D X-intercept of the graph
13 A force of 10 N is applied to a box, and the box moves 3 m in the direction of the force. What is the work done by the force? A 30 J B 13 J C 3.33 J D 0 J
14 When a body moves along a circular path with constant speed, its acceleration is directed: A Along the tangent to the circle B Towards the centre of the circle C Away from the centre of the circle D Along the radius but outward
15 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
16 When a body falls freely, its potential energy: A Increases B Decreases C Remains constant D Becomes zero immediately
17 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
18 A stone tied to a string and whirled in a circle moves along a tangent when the string breaks because: A Centripetal force keeps acting B The stone has no inertia C The centripetal force is removed D Gravity pulls it along the tangent
19 Two unlike parallel forces of 10 N and 4 N act on a body. What is the magnitude of their resultant? A 14 N B 6 N C 40 N D 2.5 N
20 A body is in stable equilibrium when a small displacement causes its centre of gravity to: A Rise B Fall C Remain at the same height D Move horizontally
21 A force of 10 N is applied to move a box 5 m along a horizontal surface in the direction of the force. What is the work done? A 2 J B 15 J C 50 J D 0.5 J
22 A see-saw is balanced when the clockwise moments about the pivot are: A Greater than anticlockwise moments B Less than anticlockwise moments C Equal to anticlockwise moments D Zero
23 According to the law of conservation of energy, energy can: A Be created but not destroyed B Be destroyed but not created C Neither be created nor destroyed D Be created and destroyed
24 Which energy source is responsible for the greenhouse effect? A Solar B Wind C Fossil fuels D Geothermal
25 When a force of 10 N moves an object 2 m in the direction of the force, the work done is: A 5 J B 10 J C 20 J D 40 J