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

RRB NTPC · Question 20

The percentage of nitrogen in the air is about A. 74% B. 76% C. 78% D. 80%

  1. A

  2. B

  3. C

  4. D

Show answer & explanation

Answer: (C) C

Explanation

Dry air is about 78% nitrogen, 21% oxygen and about 1% argon, with small amounts of carbon dioxide and other gases.