1 Which of the following methods is used to reduce friction? A Increasing the roughness of surfaces B Using lubricants between surfaces C Increasing the normal reaction D Increasing the weight of the object
6 Which force is responsible for the radioactive decay of nuclei? A Gravitational force B Electromagnetic force C Strong nuclear force D Weak nuclear force
7 The principle of conservation of momentum applies to an isolated system, which means: A No internal forces act B No external forces act C Only gravitational forces act D The total mass remains constant
8 When a gun is fired, the recoil of the gun is an example of: A Newton's first law B Newton's second law C Newton's third law D Law of gravitation
10 Which law of motion is also known as the law of inertia? A Newton's first law B Newton's second law C Newton's third law D Law of gravitation
11 According to Newton's second law of motion, F = ma. If the mass is doubled and acceleration is halved, the force will: A Remain the same B Double C Become half D Become four times
12 Newton's laws of motion fail to explain motion at: A Low speeds B Very high speeds close to the speed of light C Everyday speeds D Zero acceleration
13 The acceleration due to gravity on the Moon is about: A 1/6 of that on Earth B 1/2 of that on Earth C The same as that on Earth D Twice that on Earth
14 The force that acts on a body moving through a fluid and opposes its motion is called: A Tension B Weight C Drag (fluid friction) D Normal force
15 Electronic balances are preferred over mechanical balances because they: A Are cheaper B Provide more accurate and precise readings C Do not need electricity D Are always larger in size
16 Momentum is defined as the product of: A Mass and velocity B Force and time C Mass and acceleration D Force and distance
17 The law of conservation of momentum applies to: A An isolated system B A system with external forces C Only elastic collisions D Only inelastic collisions
18 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
19 Which of the following is a mechanical balance? A Digital bathroom scale B Beam balance C Electronic kitchen scale D Digital weighing machine
20 Which force is responsible for the attraction between two masses? A Electromagnetic force B Gravitational force C Strong nuclear force D Weak nuclear force
21 The friction that opposes the motion of a rolling object is called: A Static friction B Kinetic friction C Rolling friction D Sliding friction
22 The product of mass and velocity of an object is called its: A Impulse B Force C Momentum D Acceleration
23 Which of the following is used to measure mass accurately in a laboratory? A Spring balance B Electronic balance C Barometer D Thermometer
24 According to Newton's second law of motion, F = ma. If the mass is 5 kg and acceleration is 2 m/s², what is the net force? A 10 N B 2.5 N C 7 N D 3 N
25 When a gun is fired, it recoils backward. This is best explained by: A Newton's first law of motion B Newton's second law of motion C Newton's third law of motion D The law of gravitation