NAUI Nitrox Ceritification
Exam Study Guide – Practice
Questions with Verified
Answers. GRADED A+. Latest
2026/2027 Update.
The _____ in the air you are breathing limits the time you can stay at depth. -
Ans✔✔-Nitrogen
In the early twentieth century, a quantitative model for nitrogen loading and
dive tables were developed by _____. - Ans✔✔-John Scott Haldane
We say that nitrogen is an inert gas. This means _____. - Ans✔✔-Our bodies do
not use the nitrogen we breathe
Credit for developing and introducing nitrox diving techniques for standard
scuba goes to _____. - Ans✔✔-Dr. Morgan Wells
NAUI sanctioned enriched air nitrox training in _____. - Ans✔✔-1992
, Two benefits of diving with nitrox are _____. - Ans✔✔-Longer dive times and
shorter surface intervals
What does the "x" stand for in the term EANx? - Ans✔✔-The percentage of
oxygen in the mix.
In 1878, Paul Bert established that _____, liberated as bubbles following
sudden decompression was the cause of decompression sickness. - Ans✔✔-
Nitrogen
Nitrox is a _____ breathing gas. - Ans✔✔-Mid-range
Nitrox provides the greatest advantages for dives in the _____ depth range. -
Ans✔✔-15-33 m (50-110 ft)
As a gas is heated in a rigid closed container its pressure will _____. - Ans✔✔-
Increase
"If one quantity of gas will dissolve at one atmosphere of pressure, then three
quantities of gas will dissolve at three atmospheres." This statement refers to
which law? - Ans✔✔-Henry's Law
Atmospheric pressure can be measured in many ways. What is one atmosphere
in millimeters of mercury? - Ans✔✔-760 mmHg
The _____ of a specific gas in a mix is the portion of the total pressure exerted
by that gas. - Ans✔✔-Partial pressure
Exam Study Guide – Practice
Questions with Verified
Answers. GRADED A+. Latest
2026/2027 Update.
The _____ in the air you are breathing limits the time you can stay at depth. -
Ans✔✔-Nitrogen
In the early twentieth century, a quantitative model for nitrogen loading and
dive tables were developed by _____. - Ans✔✔-John Scott Haldane
We say that nitrogen is an inert gas. This means _____. - Ans✔✔-Our bodies do
not use the nitrogen we breathe
Credit for developing and introducing nitrox diving techniques for standard
scuba goes to _____. - Ans✔✔-Dr. Morgan Wells
NAUI sanctioned enriched air nitrox training in _____. - Ans✔✔-1992
, Two benefits of diving with nitrox are _____. - Ans✔✔-Longer dive times and
shorter surface intervals
What does the "x" stand for in the term EANx? - Ans✔✔-The percentage of
oxygen in the mix.
In 1878, Paul Bert established that _____, liberated as bubbles following
sudden decompression was the cause of decompression sickness. - Ans✔✔-
Nitrogen
Nitrox is a _____ breathing gas. - Ans✔✔-Mid-range
Nitrox provides the greatest advantages for dives in the _____ depth range. -
Ans✔✔-15-33 m (50-110 ft)
As a gas is heated in a rigid closed container its pressure will _____. - Ans✔✔-
Increase
"If one quantity of gas will dissolve at one atmosphere of pressure, then three
quantities of gas will dissolve at three atmospheres." This statement refers to
which law? - Ans✔✔-Henry's Law
Atmospheric pressure can be measured in many ways. What is one atmosphere
in millimeters of mercury? - Ans✔✔-760 mmHg
The _____ of a specific gas in a mix is the portion of the total pressure exerted
by that gas. - Ans✔✔-Partial pressure
