Consider the following:

  1. Liquid Oxygen
  2. Liquid Hydrogen
  3. Liquid Nitrogen
  4. Liquid Methane 

Which of the above can be used as a fuel in Cryogenic engines?

Answer: [D] 1, 2, 3 & 4

Each of them can be used as a croyogenic fuel.

This question is a part of GKToday's Integrated IAS General Studies Module