NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 47

Which of the following is not a greenhouse gas? A.Ozone B. Nitrous oxide C. Water vapor D. Hydrogen

  1. B

  2. C

  3. D

  4. A

Show answer & explanation

Answer: (C) D

Explanation

Greenhouse gases absorb and re-emit infrared heat. Ozone, nitrous oxide and water vapour all do this (along with CO₂ and methane). Hydrogen (H₂) does not absorb infrared radiation directly, so it is not a greenhouse gas.