Air Pollution: Causes, Effects and Control · NCERT Biology

Following the Supreme Court's directive, the entire fleet of public transport (buses) in Delhi was switched from diesel to ________ by the end of 2002.

  1. Unleaded petrol (ULP)
  2. CNG (Compressed Natural Gas)
  3. Electric battery systems (EBS)
  4. Hydrogen fuel cells (HFC)
Show answer and explanation

Correct answer: CNG (Compressed Natural Gas)

CNG was chosen as a cleaner alternative because it burns more efficiently than diesel or petrol, leaving very little unburnt residue. Additionally, CNG is cheaper and cannot be siphoned off or adulterated easily.

Difficulty: Medium Question 10 of 20

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