Air Quality and Climate Quiz
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5 questions, one answer each
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1. What is the approximate percentage of oxygen in clean, dry air?
- A. 21%
- B. 78%
- C. 1%
- D. 10%
2. Which of the following air pollutants is produced by the incomplete combustion of carbon-containing fuels?
- A. Sulfur dioxide
- B. Carbon monoxide and particulates
- C. Methane
- D. Oxides of nitrogen
3. Greenhouse gases such as CO₂ and methane cause global warming primarily by:
- A. Producing ozone in the upper atmosphere
- B. Absorbing and reflecting thermal energy, reducing heat loss to space
- C. Destroying the ozone layer above the equator
- D. Increasing the rate of photosynthesis in plants
4. A catalytic converter in a car engine converts nitrogen oxides using carbon monoxide. In this reaction, 2CO + 2NO → 2CO₂ + N₂. What are the two products formed?
- A. Carbon dioxide and nitrogen gas
- B. Nitrogen monoxide and carbon dioxide
- C. Nitrogen oxides and oxygen gas
- D. Carbon monoxide and nitrogen oxide
5. A student argues that the best strategy to reduce global warming from greenhouse gases would be to increase livestock farming and burn more coal. Explain why this strategy is fundamentally flawed according to Cambridge IGCSE Chemistry specifications.
- A. Livestock farming produces methane, a greenhouse gas; burning coal produces CO₂, both cause global warming
- B. Livestock farming reduces carbon dioxide and coal burning increases oxygen levels
- C. Methane is not a greenhouse gas; only ozone causes climate change
- D. Increased livestock and coal use would reduce the need for renewable energy