2015 First Aid Exam No. 4 Taken from the 2015 Missouri S&T First Aid Contest held in Rolla, Missouri Progress Indicator: Question 7 of 30 7.  If your oxygen cylinder was filled with air what would happen if a member of my team used the apparatus? Choices: Not enough CO2 would be scrubbed or removed Nothing, they would only get about 21% of the four-hour rated duration They would not get enough oxygen and will pass out quickly They will get CO2 poisoning