NAUI Nitrox Certification. Questions
with Correct Verified Answers. Latest
2026-2027. Graded A
_____ is the highest percentage of oxygen that can be used at the planned
dive depth. - ANSBest mix
_____ Law states: "At a constant temperature, the volume of a gas varies
inversely with absolute pressure, while the density of a gas varies directly
with absolute pressure." - ANSBoyle's
_____ uses a material called a molecular sieve that selectively adsorbs a
thin layer of nitrogen from the air that passes over or through it. -
ANSPressure swing absorption
_____ uses a semi-permeable membrane that allows oxygen to flow
through it more readily than nitrogen. - ANSMembrane separation
"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? - ANSHenry's Law
A diver suffering from nitrogen narcosis will always be aware that he is
impaired. - ANSFalse
1
, A diver using EAN32 makes a dive to 33 msw (110 fsw) for 23 minutes.
After a surface interval of 2 hours, he makes a second dive (also using
EAN32) to 23 msw (75 fsw). Using NAUI EAN32 Dive Tables, what is his
adjusted maximum dive time for the second dive? - ANS24 minutes
A stuporous condition characterized by impaired mental and physical
performance and changes in mood and behavior is known as _____. -
ANSNitrogen narcosis
After the gas is analyzed and the cylinder is labeled, the diver must _____.
- ANSDocument the fill by completing an entry in the fill log
All components of the _______ are required for a fire to take place. -
ANSFire triangle
An essential operation in using an oxygen analyzer is _____. -
ANSCalibrating it
An oxygen analyzer should display oxygen content to an accuracy of
_____. - ANSOne-tenth of one percent
Any equipment that is used with pure oxygen or an oxygen level above
_______ must be cleaned for oxygen service. - ANS40%
As a gas is heated in a rigid closed container its pressure will _____. -
ANSIncrease
2
with Correct Verified Answers. Latest
2026-2027. Graded A
_____ is the highest percentage of oxygen that can be used at the planned
dive depth. - ANSBest mix
_____ Law states: "At a constant temperature, the volume of a gas varies
inversely with absolute pressure, while the density of a gas varies directly
with absolute pressure." - ANSBoyle's
_____ uses a material called a molecular sieve that selectively adsorbs a
thin layer of nitrogen from the air that passes over or through it. -
ANSPressure swing absorption
_____ uses a semi-permeable membrane that allows oxygen to flow
through it more readily than nitrogen. - ANSMembrane separation
"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? - ANSHenry's Law
A diver suffering from nitrogen narcosis will always be aware that he is
impaired. - ANSFalse
1
, A diver using EAN32 makes a dive to 33 msw (110 fsw) for 23 minutes.
After a surface interval of 2 hours, he makes a second dive (also using
EAN32) to 23 msw (75 fsw). Using NAUI EAN32 Dive Tables, what is his
adjusted maximum dive time for the second dive? - ANS24 minutes
A stuporous condition characterized by impaired mental and physical
performance and changes in mood and behavior is known as _____. -
ANSNitrogen narcosis
After the gas is analyzed and the cylinder is labeled, the diver must _____.
- ANSDocument the fill by completing an entry in the fill log
All components of the _______ are required for a fire to take place. -
ANSFire triangle
An essential operation in using an oxygen analyzer is _____. -
ANSCalibrating it
An oxygen analyzer should display oxygen content to an accuracy of
_____. - ANSOne-tenth of one percent
Any equipment that is used with pure oxygen or an oxygen level above
_______ must be cleaned for oxygen service. - ANS40%
As a gas is heated in a rigid closed container its pressure will _____. -
ANSIncrease
2
