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NDA 2021 GAT · General Knowledge · Physical Geography · easy

Which gas forms the largest part of the Earth's atmosphere by volume?

Single correct option

Which gas forms the largest part of the Earth's atmosphere by volume?
  1. A. Nitrogen
  2. B. Oxygen
  3. C. Argon
  4. D. Carbon dioxide
Show answer and solution

Answer: (A) Nitrogen

Nitrogen makes up about 78 percent of dry air, oxygen about 21 percent, argon about 0.93 percent and carbon dioxide only about 0.04 percent. Oxygen is the second-most abundant gas and sustains life, which is why it is the common wrong answer.
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Original question written in the NDA 2021 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake