1 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
2 If a body moves 4 m east then 3 m west, its displacement is: A 7 m east B 1 m east C 1 m west D 7 m west
3 For a body to be in equilibrium under the action of several forces, the vector sum of all forces must be: A Maximum B Minimum C Zero D Constant
4 A body falling freely under gravity has an acceleration: A Around 9.8 m/s² upwards B Around 9.8 m/s² downwards C Equal to zero D Equal to its speed
5 ورنیئر کالیپرز کا کم سے کم پیمانہ 0.01 سینٹی میٹر ہے۔ اس سے لی گئی ایک پیمائش میں غیر یقینی پن کتنا ہے؟ A ±0.01 سینٹی میٹر B ±0.005 سینٹی میٹر C ±0.02 سینٹی میٹر D ±0.1 سینٹی میٹر
6 A body is said to be at rest if its position with respect to a frame of reference: A Changes with time B Does not change with time C Increases with time D Decreases with time
7 Which instrument is used to measure the length of a small object with high precision? A Metre rule B Vernier callipers C Tape measure D Beam balance
8 According to the principle of moments, a body is in equilibrium when the total clockwise moment is: A Greater than the total anticlockwise moment B Equal to the total anticlockwise moment C Less than the total anticlockwise moment D Always zero
9 A student measures the length of a pencil as 12.4 cm, 12.5 cm, and 12.4 cm. These measurements show: A High accuracy but low precision B High precision but low accuracy C Both high accuracy and high precision D Neither accuracy nor precision
10 Two parallel 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 1.67 N
11 In a free-body diagram, the force exerted by a surface on an object perpendicular to the surface is called: A Weight B Normal reaction C Friction D Tension
12 The main environmental problem caused by burning fossil fuels is: A Ozone depletion B Global warming C Acid rain only D Noise pollution
13 The stability of a body can be increased by: A Raising its centre of gravity B Narrowing its base C Lowering its centre of gravity D Making its line of action fall outside the base
14 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
15 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
16 A body is in dynamic equilibrium when it moves with: A Increasing velocity B Constant velocity C Constant acceleration D Zero velocity
17 The force that opposes the motion of an object when it moves through a fluid (liquid or gas) is called: A Tension B Normal reaction C Air resistance (drag) D Gravitational force
18 Which of the following is a non-contact force? A Friction B Tension C Gravitational force D Normal reaction
19 A rocket moves forward because the exhaust gases are pushed backward. This is an example of: A Newton's first law B Newton's second law C Newton's third law D Law of gravitation
21 The motion of smoke particles in air is an example of: A Translational motion B Rotational motion C Random motion D Vibrational motion
22 The main advantage of nuclear power is: A It produces no radioactive waste B It releases no greenhouse gases during operation C It is very cheap to build D It uses renewable fuel
23 The momentum of an object is defined as the product of its mass and: A Acceleration B Force C Velocity D Displacement
24 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