Physics level 10 Quiz

What does the Law of Conservation of Energy state?

• Energy can be created and destroyed.

• Energy can be transformed from one form to another but cannot be created or destroyed.

• Energy is always lost in any transformation.

• Energy is only conserved in closed systems.

Which of the following is an example of a system where the Law of Conservation of Energy can be analysed?

• A closed box with no energy exchange.

• Earth systems.

• A vacuum with no particles.

• An isolated atom.

What is the primary difference between alternating current (AC) and direct current (DC)?

• AC flows in one direction, while DC changes direction periodically.

• AC changes direction periodically, while DC flows in one direction.

• AC is used in batteries, while DC is used in power lines.

• AC is generated by photovoltaic cells, while DC is generated by turbines.

Which of the following methods can be used to generate alternating current (AC)?

• Photovoltaic cells.

• Batteries.

• Turbines turned by wind, water, tides, or steam.

• Chemical reactions.

What is the role of magnets in generating electricity?

• They store electrical energy.

• They convert electrical energy into mechanical energy.

• They are used to create a magnetic field that induces electrical current in a conductor.

• They are used to cool down electrical circuits.

Which of the following energy sources can be used to turn turbines for generating electricity?

• Solar panels.

• Wind, water, tides, or steam.

• Batteries.

• Chemical reactions.

What is the primary function of photovoltaic cells?

• To store electrical energy.

• To convert sunlight directly into electrical energy.

• To convert mechanical energy into electrical energy.

• To generate heat from electrical energy.

Which of the following is NOT a method of generating electricity?

• Using wind turbines.

• Using photovoltaic cells.

• Using chemical batteries.

• Using a vacuum.

What type of current is typically used in household electrical systems in Australia?

• Direct current (DC).

• Alternating current (AC).

• Static current.

• Pulsating current.

Which of the following is a renewable energy source used to generate electricity?

• Coal.

• Oil.

• Wind.

• Natural gas.