Chapter 6: Work and Energy

1

According to conservation of energy, total energy remains:

A Increasing B Decreasing C Constant D Zero

2

Which formula represents work done?

A Work = Force / Distance B Work = Force × Distance C Work = Mass × Acceleration D Work = Power × Time

3

Quinn is studying tides. He knows that tidal energy is generated by the movement of water due to tides. What causes tides?

A Wind B Gravitational pull of the Sun and Moon C Earth's rotation D Volcanic activity

4

David is studying fossil fuels. He knows that fossil fuels are formed from the remains of ancient organisms. Which of the following is a fossil fuel?

A Petroleum B Biomass C Solar energy D Wind energy

5

Uma is studying efficiency. She knows that efficiency is expressed as a percentage. If a machine has an efficiency of 80%, what does this mean?

A 80% of input energy is converted to useful output B 80% of input energy is wasted C The machine is 80% powerful D The machine does 80 J of work

6

Which energy source is non-renewable?

A Wind B Hydel C Coal D Solar

7

Chloe is studying the conversion of energy in a hydroelectric dam. The potential energy of water is converted to kinetic energy, which then turns turbines. What is the final form of energy?

A Chemical energy B Electrical energy C Nuclear energy D Thermal energy

8

If more work is done in less time, power will be:

A Less B Zero C More D Negative

9

Quinn is studying potential energy. He knows that potential energy is given by PE = mgh. If the height of an object is doubled, what happens to its potential energy?

A It doubles B It quadruples C It halves D It remains the same

10

Ahmed is pushing a heavy box across a horizontal floor with a force of 50 N over a distance of 10 meters. He wants to know how much work he has done. What is the work done?

A 500 Joules B 50 Joules C 5 Joules D 5000 Joules

11

Kinetic energy depends on:

A Mass only B Velocity only C Mass and velocity D Height only

12

When a body falls freely, its potential energy is converted into:

A Chemical energy B Heat energy C Kinetic energy D Sound energy

13

Energy obtained from flowing water is called:

A Thermal energy B Hydel energy C Solar energy D Nuclear energy

14

Uma is studying the work-energy principle. She knows that work done on an object changes its energy. If a force does 200 J of work on a stationary object, what is the increase in kinetic energy?

A 200 J B 100 J C 400 J D 0 J

15

Victor is studying energy resources. He knows that fossil fuels are non-renewable. Which of the following is a renewable energy resource?

A Solar energy B Coal C Oil D Natural gas

16

Bilal is studying the work done by a force. He applies a force of 100 N to move an object by 2 meters in the direction of the force. What is the work done?

A 200 J B 100 J C 50 J D 0 J

17

Emma is studying the kinetic energy of a moving car. The car has a mass of 1000 kg and is moving at a speed of 20 m/s. What is the kinetic energy of the car?

A 200,000 Joules B 20,000 Joules C 10,000 Joules D 200 Joules

18

Nora is studying energy resources. She knows that non-renewable resources are finite and will eventually run out. Which of the following is a non-renewable resource?

A Solar energy B Natural gas C Wind energy D Geothermal energy

19

Bilal is holding a heavy book stationary at a height of 1 meter above the ground. He is exerting an upward force, but the book does not move. How much work is Bilal doing on the book?

A Work equal to the weight of the book B Zero work C Work equal to the height D Work equal to the mass times the height

20

The SI unit of power is:

A Joule B Newton C Watt D Ampere

21

Yusuf is studying energy resources. He knows that nuclear energy is a non-renewable resource. What is the source of nuclear energy?

A Fusion of hydrogen atoms B Combustion of fossil fuels C Splitting of uranium atoms D Motion of water

22

Ming is studying solar radiation. He knows that solar energy is a renewable energy resource. What device is used to convert solar energy into electricity?

A Solar panels B Wind turbines C Hydroelectric dams D Nuclear reactors

23

If force is applied but no displacement occurs, the work done is:

A Maximum B Minimum C Zero D Negative

24

Oliver is studying the conservation of energy. He knows that energy is conserved in a closed system. In a roller coaster, where is the potential energy maximum?

A At the highest point B At the lowest point C At the middle of the track D It is constant everywhere

25

Victor is studying energy resources. He knows that renewable resources can be replenished naturally. Which of the following is a renewable resource?

A Solar energy B Coal C Oil D Natural gas