Understanding Renewable Energy Sources

What is the most common biomass fuel mentioned in the text?

• Methanol

• Ethanol

• Biodiesel

• Butanol

What percentage of ethanol in the U.S. is derived from corn and corn by-products?

• 50%

• 75%

• 92%

• 100%

Which country gets 100% of its electricity from renewable energy sources, as mentioned in the text?

• United States

• Iceland

• Canada

• France

What is the typical ratio of ethanol to gasoline in fuel mixtures?

• 1:5

• 1:10

• 1:15

• 1:20

What is one of the benefits of mixing ethanol with gasoline?

• Increases the freezing point of gasoline

• Reduces air pollutants

• Decreases octane level

• Increases fossil fuel usage

What is geothermal energy primarily used for, according to the text?

• Producing biofuels

• Heating water and producing electricity

• Generating tidal energy

• Increasing fossil fuel efficiency

What is the estimated global energy efficiency according to the United Nations Development Program World Energy Assessment (2015)?

• 25%

• 37%

• 50%

• 60%

What is one method mentioned in the text to reduce peak electricity demand?

• Building more power plants

• Encouraging off-peak electricity usage

• Increasing fossil fuel consumption

• Reducing the number of appliances