Fire & Dert Rescuer (FDR) Fire Rescuer (FR) General Knowledge MCQs Lead Fire Rescuer (LFR) Rescue 1122 What is % of Oxygen in air? September 9, 2021 Admin No Comments A: 17% B: 29% C: 21% D: 23% Correct Answer: c Short Details: Nitrogen 78.09% Carbon Dioxide 0.04% View More Details >>
