Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).
Environment, Weather & EcologyComposition of Atmosphere
What is the approximate percentage of oxygen in atmospheric air?
- A.78%
- B.21%Correct answer
- C.0.03%
- D.1%
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Practice these MCQs in the appQuick fact: The approximate percentage of oxygen in atmospheric air is 21%.