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Delhi converted its entire bus fleet to CNG by the end of:

A2010
B2002
C1997
D2005
Answer & Solution
Correct answer: B. 2002
1. The Supreme Court directed the switch. 2. All buses ran on CNG by end of 2002. 3. CNG burns almost completely and cannot be adulterated easily. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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