2 When a body moves in a direction opposite to the applied force, the work done by the force is: A Positive B Negative C Zero D Infinite
3 The kinetic energy of a moving object depends on: A Its mass and speed B Its mass and height C Its weight and speed D Its volume and height
4 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
5 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
7 In a simple pendulum, the energy at the mean position is mostly: A Potential energy B Kinetic energy C Chemical energy D Nuclear energy
8 When a body moves in a circular path and the force is directed towards the center, the work done by the force is: A Positive B Negative C Zero D Maximum
10 In a hydroelectric power plant, the energy of flowing water is converted into: A Chemical energy B Nuclear energy C Electrical energy D Solar energy
11 The work-energy theorem states that work done on a body equals the change in its: A Potential energy B Kinetic energy C Total energy D Power
12 The formula for efficiency is: A Efficiency = (Useful output energy / Total input energy) × 100% B Efficiency = (Total input energy / Useful output energy) × 100% C Efficiency = Useful output energy × Total input energy D Efficiency = Total input energy − Useful output energy
13 Which source of energy is derived from the heat of the Earth? A Solar energy B Wind energy C Geothermal energy D Tidal energy
14 Power is defined as: A work done per unit force B work done per unit time C force per unit area D energy per unit mass
15 A force of 10 N acts on a body and moves it 5 m in the direction of the force. What is the work done? A 2 J B 5 J C 50 J D 0.5 J
16 When a force of 1 N displaces an object by 1 m in the direction of force, the work done is: A 1 J B 1 W C 1 N D 1 Pa
17 Which of the following is a disadvantage of using fossil fuels? A They are renewable B They produce no pollution C They produce harmful gases like CO₂ and cause pollution D They are available in unlimited quantity
18 In a simple pendulum, the energy at the highest point of its swing is mainly: A Kinetic energy B Potential energy C Thermal energy D Electrical energy
19 The work-energy relation states that the work done on a body is equal to the change in its: A Potential energy B Kinetic energy C Power D Momentum
20 In a simple pendulum, at the mean position, the energy is: A Entirely potential B Entirely kinetic C Half potential and half kinetic D Zero
21 The efficiency of a machine is 80%. If the input energy is 500 J, the useful output energy is: A 100 J B 400 J C 500 J D 625 J
22 The energy possessed by a body due to its position or height is called: A Kinetic energy B Potential energy C Chemical energy D Electrical energy
24 The law of conservation of energy states that energy: A Can be created B Can be destroyed C Can neither be created nor destroyed D Always increases
25 Which energy source is derived from the heat of the Earth? A Solar energy B Wind energy C Geothermal energy D Tidal energy