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Asian Sciences Olympiad 2015 — Division M, Level 3 (Years 7–9) Question 13

ASMO Science · Asian Sciences Olympiad 2015 — Division M, Level 3 (Years 7–9)

Question 13

Leaded petrol was once used widely as fuel for vehicles. It was banned in 1970’s and slowly be phased out with the replacement of unleaded petrol. What is the main reason behind it?

Question illustration
  1. Leaded petrol is expensive.
  2. Leaded petrol cannot burn completely.
  3. Lead is very toxic and cause impacts to human health.
  4. Leaded petrol will cause knocking sounds in car engines.