Combustion and fuels Quiz
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5 questions, one answer each
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1. Which of these is a fossil fuel?
- A. Wood
- B. Hydrogen
- C. Natural gas
- D. Ethanol made from sugar cane
2. Which products form when a hydrocarbon burns completely?
- A. Carbon monoxide and water
- B. Carbon dioxide and water
- C. Carbon and hydrogen
- D. Carbon dioxide and hydrogen
3. A candle flame produces a yellow flame and black soot on a cold spoon. What does this show?
- A. Complete combustion
- B. Incomplete combustion
- C. No combustion
- D. Condensation only
4. Why is carbon monoxide hard to detect without an alarm?
- A. It is a solid
- B. It is bright yellow
- C. It is coloured and smells strongly
- D. It is colourless and odourless
5. Which result shows that carbon dioxide is present?
- A. Limewater turns cloudy
- B. A glowing splint relights
- C. A lit splint pops
- D. Damp litmus paper is bleached