Biofuels and fossil fuels

Which of the following gases is a major contributor to global warming when fossil fuels are burned?

• Oxygen

• Hydrogen

• Nitrogen

• Carbon Dioxide

What is one of the main disadvantages of burning fossil fuels?

• They produce oxygen

• They are renewable

• They release sulfur dioxide causing acid rain

• They are inexpensive

What are biofuels produced from?

• Water

• Living matter

• Metals

• Minerals

Why are biofuels considered carbon neutral?

• They do not release any carbon dioxide

• The carbon dioxide released is equal to the amount absorbed during production

• They absorb more carbon dioxide than they release

• They are made from non-carbon materials

What is the main component of biogas?

• Nitrogen

• Hydrogen

• Methane

• Oxygen

What is the purpose of the digesters in biogas production?

• To digest feedstocks anaerobically

• To store the biogas

• To cool down the biogas

• To filter the biogas

What is a byproduct of the biogas production process that can be used as a fertilizer?

• Methane

• Digestate

• Sulfur dioxide

• Carbon dioxide

How is bioethanol produced?

• By burning wood

• By fermenting sugar with yeast

• By anaerobic digestion

• By compressing natural gas

Which country is mentioned as being particularly suitable for bioethanol production due to its sugar crops?

• India

• Brazil

• China

• USA

What is one of the main benefits of biofuels over fossil fuels?

• They are non-renewable

• They are cleaner and more environmentally friendly

• They produce more carbon dioxide

• They are more expensive