Home PYQs UPPSC UPPSC MCQs Prelims 1998 (GS Paper I)

Question

To avoid "knocking" of the engine of a car, which one of the following is used as an anti-knocking agent?

  1. Ethyl alcohol
  2. Butane
  3. Lead Tetra Ethyl
  4. White petrol

Answer:

Option C: Lead Tetra Ethyl

Detailed Solution:

The correct answer is “Lead Tetra Ethyl”.

While Lead Tetra Ethyl (TEL) was once widely used as an anti-knocking agent, its harmful effects on human health and the environment led to its phase-out in many countries. It was replaced by other additives like ethanol and oxygenates.