Easy
Medium
Hard
Insane
100

What is energy?

The ability of bodies to perform work.

100

What happens when energy is consumed?

It doesn’t disappear; it transforms into another form.

100

What is nuclear energy?

Energy stored in the nucleus of atoms, released when the nucleus changes.

100

Give a real-life example of potential → kinetic energy.

A book falling from a shelf or water flowing down a waterfall.

200

What is mechanical energy?

Energy a body has to produce movement; includes potential and kinetic energy.

200

What is chemical energy?

Energy stored in a substance’s chemical composition (like gasoline or food).

200

Give an example of chemical → mechanical energy.

Burning gasoline in a car engine makes the car move.

Food that is processed by body systems, allowing humans to move.

200

Why can humans and animals do physical work using food?

Because the chemical energy in food becomes mechanical energy in muscles.

300

What is potential energy?

Energy a body has because of its position in space.

300

What is thermal energy?

Energy transmitted between bodies at different temperatures.

300

Give a real-life example of electrical → heat energy.

A toaster or an electric heater.

300

State the principle of conservation of energy.

Energy is never destroyed; it only transforms from one form to another.

400

What is kinetic energy?

Energy a body has when it is moving.

400

What is electrical energy?

Energy produced by the movement of electric charges through a conductor.

400

What particles carry electric energy through a metal wire?

Electrons

400

True or False: Most known forms of energy are produced from chemical energy.

True

500

When is kinetic energy equal to zero?

When the body is at rest.

500

What does electrical energy become in a light bulb?

Light and heat.

500

Name three types of power plants that produce electricity.

Hydroelectric, thermal (coal), and nuclear plants.

500

Explain briefly how a thermal power plant generates electricity.

Burning coal produces heat → boils water → steam turns turbines → generators produce electricity.