6.3 Energy Resources [Mastery check]

What is the efficiency of a solar cell if 1000 J of solar energy hits the cell and 200 J are converted into electrical energy?

• 10%

• 20%

• 30%

• 40%

• A

• B

• C

• D

• A

• B

• C

• D

Electricity can be obtained from different energy resources. Which energy resource is used to obtain electricity without producing heat to boil water?

• coal

• geothermal

• hydroelectric

• nuclear

A power station uses nuclear fission to obtain energy. In this process, nuclear energy is first changed into

• Chemical energy.

• Electrical energy.

• Gravitational energy.

• Internal (Thermal) energy.

Fossil fuels are nonrenewable  resources because they

• take millions of years to form
• are easily replaced
• are in high demand
• don't pollute the air

All of the following are renewable except

• uranium
• solar
• hydropower
• food crops (biomass)

Besides coal and natural gas, another fossil fuel  is

• petroleum/oil
• biomass
• electricity
• uranium

The original source of energy for fossil fuels comes from the

• sun
• Earth's crust
• geothermal energy
• oceans

This fossil fuel releases the least amount of air pollution

• natural gas
• coal
• nuclear
• oil