1 The force that acts on a body moving in a circular path and is directed towards the center is called: A Centrifugal force B Centripetal force C Frictional force D Gravitational force
2 Ball bearings are used to: A Increase friction between moving parts B Reduce friction between moving parts C Increase weight of the machine D Change the direction of force
3 The force that opposes the relative motion between two surfaces in contact is called: A Gravity B Friction C Magnetic force D Electrostatic force
4 Which of the following forces is a non-contact force? A Friction B Gravitational force C Muscular force D Normal force
5 Which fundamental force is the weakest? A Strong nuclear force B Electromagnetic force C Weak nuclear force D Gravitational force
6 If the mass of an object is 10 kg, what is its weight on Earth? (Take g = 9.8 m/s²) A 10 N B 9.8 N C 98 N D 0.98 N
7 A force that acts only when two surfaces are in contact is: A Gravitational force B Magnetic force C Friction D Electrostatic force
8 Which of the following reduces friction by changing sliding friction into rolling friction? A Ball bearings B Lubricants C Streamlined shape D Increasing weight
9 The force that opposes the motion of an object moving through air is called: A Air resistance B Gravitational force C Magnetic force D Electrostatic force
10 Which method is commonly used to reduce friction? A Increasing the weight of the object B Making surfaces rougher C Using lubricants D Increasing the contact area
11 Weight is defined as: A The amount of matter in an object B The gravitational force acting on an object C The space occupied by an object D The resistance to motion
12 The force that opposes the motion of an object through a fluid is called: A Drag B Lift C Thrust D Weight
13 Which of the following is NOT a fundamental force in nature? A Gravitational force B Electromagnetic force C Frictional force D Weak nuclear force
14 Which force opposes the motion of an object moving through a fluid? A Gravitational force B Friction (drag) C Strong nuclear force D Electromagnetic force
15 Streamlined shapes are used in vehicles to: A Increase friction B Reduce drag (fluid friction) C Increase weight D Decrease efficiency
17 Which method is used to reduce friction between moving parts of a machine? A Increasing the load B Making surfaces rough C Using lubricants D Increasing the surface area
18 Which of the following is a method to reduce friction? A Increasing the weight of the object B Making the surfaces rougher C Using ball bearings D Increasing the surface area of contact
19 A contact force that acts between surfaces in relative motion is: A Gravity B Friction C Magnetic force D Electrostatic force
20 Friction always acts: A in the direction of motion B opposite to the direction of motion C perpendicular to the direction of motion D in any direction
21 The weight of an object is defined as: A The amount of matter in the object B The gravitational force acting on the object C The resistance of the object to motion D The force exerted by the object on a surface
22 Weight of an object is: A the same as its mass B the force with which the Earth attracts the object C the amount of matter in the object D independent of gravity
23 When 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 consumes D The machine has no friction
24 The force that opposes the motion of an object moving on a surface is called: A Gravitational force B Magnetic force C Friction D Electrostatic force
25 The efficiency of a machine is defined as the ratio of: A Work input to work output B Work output to work input C Load to effort D Distance moved by load to distance moved by effort