Fuels, climate and alternatives Quiz
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5 questions, one answer each
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1. Which greenhouse gas is released by cattle and landfill sites?
- A. Oxygen
- B. Nitrogen
- C. Argon
- D. Methane
2. What happens to infrared radiation in the greenhouse effect?
- A. It is all reflected into space
- B. It is absorbed by greenhouse gases and some is re-emitted towards Earth
- C. It is turned into light
- D. It is absorbed by the ozone layer
3. Which fuel produces only water when it is used?
- A. Hydrogen
- B. Petrol
- C. Bioethanol
- D. Coal
4. Why are biofuels approximately carbon neutral?
- A. They contain no carbon
- B. They burn without oxygen
- C. The carbon dioxide released is about equal to that absorbed by the plants as they grew
- D. They are made from crude oil
5. A fuel releases 27 MJ per kg and another 46 MJ per kg. Which statement is correct?
- A. The first fuel releases more energy per kilogram
- B. Both fuels release the same energy
- C. The second fuel releases more energy per kilogram
- D. Neither fuel can be burned