Nitrox Test Questions with Correct
Verified Answers. Latest 2026-2027.
Graded A
_____ 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
4 Methods to plan to use NITROX - ANS1. Safe air
2. Equiv. air depth using air tables
3. NAUI dive tables
4. EAN Dive computer
At a constant temperature the volume of gas varies inversely with absolute
pressure and density varies directly with absolute pressure - ANSBoyles
law
At the first signs or symptoms of oxygen toxicity, a diver should: -
ANSTerminate the dive
AVERAGE DEPTH must be used in calculating SACR. - ANSTrue
1
, Boyles
Charles
Henrys
Daltons - ANSBoyles: Pressure & volume
Charles: Temperature and volume
Henrys: Solubility of gases
Daltons: Partial pressures
Cold, hard, or deco, what is max PO2? - ANS1,4
Continuous flow method is good for what? - ANSlarger quantity of nitrox is
needed
Credit for developing and introducing nitrox diving techniques for standard
scuba goes to _____. - ANSDr. Morgon Wells
Difference between pressure swing absorption and membrane seperation -
ANSPressure swing- adheres nitrogen
Membrane seperation - Semipermeable membrane allows oxygen to flow
through more readily
For most persons, symptoms of hypoxia begin to appear when the PO2
_____. - ANSFalls below about 0.16 ata.
How Long? pO2
How Deep? Pa (then D)
2
Verified Answers. Latest 2026-2027.
Graded A
_____ 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
4 Methods to plan to use NITROX - ANS1. Safe air
2. Equiv. air depth using air tables
3. NAUI dive tables
4. EAN Dive computer
At a constant temperature the volume of gas varies inversely with absolute
pressure and density varies directly with absolute pressure - ANSBoyles
law
At the first signs or symptoms of oxygen toxicity, a diver should: -
ANSTerminate the dive
AVERAGE DEPTH must be used in calculating SACR. - ANSTrue
1
, Boyles
Charles
Henrys
Daltons - ANSBoyles: Pressure & volume
Charles: Temperature and volume
Henrys: Solubility of gases
Daltons: Partial pressures
Cold, hard, or deco, what is max PO2? - ANS1,4
Continuous flow method is good for what? - ANSlarger quantity of nitrox is
needed
Credit for developing and introducing nitrox diving techniques for standard
scuba goes to _____. - ANSDr. Morgon Wells
Difference between pressure swing absorption and membrane seperation -
ANSPressure swing- adheres nitrogen
Membrane seperation - Semipermeable membrane allows oxygen to flow
through more readily
For most persons, symptoms of hypoxia begin to appear when the PO2
_____. - ANSFalls below about 0.16 ata.
How Long? pO2
How Deep? Pa (then D)
2
