Power Plays Checkpoint #2

The Law of Conservation of Energy states that energy cannot be

• Converted or disguised

• Created or destroyed

• Conducted or destroyed

• Created or disguised

Which of the following is the most important property of energy?

• Energy is required for machines to do work

• Energy can be renewable or non-renewable

• Energy can be changed from one form to another

• Energy from the Sun is in endless supply

What can energy do?

• Energy makes things happen

• Energy causes changes

• Energy has the ability to do work

• All of the above

Fossil fuels are

• Renewable sources of energy

• Non-renewable sources of energy

• Both renewable and non-renewable sources of energy

• None of the above

The main advantage of solar energy over other energy sources is that it

• Is unlimited

• Can be converted into heat energy

• Can be converted into electrical energy

• Can be used only during the day

The picture is of a torch. In this device, energy is transformed from

• Light to electrical

• Chemical to light

• Light to chemical

• Electrical to light

Energy transformations occurs when

• Energy forms matter as in the formation of the universe

• One form of energy changes to another energy form in the same object

• The form of energy remains the same but is moved from one object to another

• Matter transforms to make energy in nuclear reactions

Oil is a natural resource that humans use as a fuel for many applications. Which of the following strategies would NOT be effective in reducing the impacts of obtaining oil from the environment?

• The development of alternative fuels made from renewable resources

• Humans could make greater use of public transport

• Cars could be made smaller and lighter so less fuel was used

• Oil drilling could be done in oceans rather than on land

The diagram shows the energy changes that occur when coal is burned in a power station. What percentage of the energy is lost as heat?

• 10%

• 20%

• 50%

• 60%

The graph shows data about the use of electricity in Australian homes. Which of the following uses the most electricity in Australian homes?

• Freezer

• Pool

• Stand-by

• Other