Question 737 Deck Safety

70% to pass

Ambient air, which you normally breathe, contains what percent of oxygen?

A 6%
B 10%
C 15%
D 21%
AI Explanation

The correct answer is D) 21%. Ambient air, which is the air we normally breathe, contains approximately 21% oxygen. This is the standard composition of dry air at sea level, as defined by the International Union of Pure and Applied Chemistry (IUPAC) and other regulatory bodies. The other options are incorrect because they do not accurately reflect the typical oxygen content in ambient air.

Related Questions
Q724:You are testing a tank that contained gasoline by using a combustible gas indica... Q1901:The maximum length allowed between main, transverse bulkheads on a vessel is re... Q2142:For small angles of inclination, if the KG were equal to the KM, then the vessel... Q206:Which of the following is True if your radiotelephone fails while underway? ... Q2397:You have 200 tons of below deck tonnage. There is no liquid mud aboard. If you h...

Ready to test your knowledge?

Take a Deck Safety Practice Exam
Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
← Previous All Questions Next →

Pass Your Coast Guard Licensing Exams!

Study offline, track your progress, and simulate real exams with the Coast Guard Exams app

Download on App Store Get it on Google Play Download for Mac