NAUI Nitrox Diver Questions with Detailed
Verified Answers
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:
15-33m (50-110ft)
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: 760mmHg
The _____________ of a specific gas in a mix is the portion of the total pressure
exerted by that gas.— Ans: Partial Pressure
What is the absolute pressure at 17 msw (56 fsw)?— Ans: 2.7 ata
What is the oxygen partial pressure (PO2) in EAN35 at a depth of 26 msw (85 fsw)?—
Ans: 1.3 ata
If the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw),
what is the fraction of oxygen in the mix?— Ans: .28
What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)?— Ans:
.65 ata
The symptoms of nitrogen narcosis parallel those often seen in _____.— Ans:
Alcohol Intoxication
, _____ 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."— Ans: Boyle's Law
True or False: A diver suffering from nitrogen narcosis will always be aware that
he/she is impaired.— Ans: False
The mechanisms of nitrogen narcosis are thought to be similar to:— Ans: Anesthesia
The controlled release of pressure during ascent from a scuba dive is:— Ans:
Decompression
Which gas in air is essential to sustain life?— Ans: Oxygen
The primary waste product from the metabolism of oxygen is:— Ans: Carbon
Dioxide
For most persons, symptoms of hypoxia begin to appear when the PO2:— Ans: Falls
below about 0.16 ata.
Pulmonary oxygen toxicity results from:— Ans: Prolonged exposure to elevated
oxygen partial pressures.
One of the factors that can increase susceptibility to CNS oxygen toxicity is:— Ans:
Heavy exercise and carbon dioxide buildup.
The acronym used to remember signs and symptoms of oxygen toxicity is:— Ans:
Con V E N T I D.
The recommended maximum PO2 for enriched air nitrox diving is:— Ans: 1.4 ata.
The first precursor symptom of CNS oxygen toxicity is:— Ans: Precursor symptoms
are highly variable.
A stuporous condition characterized by impaired mental and physical performance and
changes in mood and behavior is known as _____.— Ans: Nitrogen narcosis
© Get it right 2025 Getaway - Stuvia US All rights reserved
Verified Answers
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:
15-33m (50-110ft)
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: 760mmHg
The _____________ of a specific gas in a mix is the portion of the total pressure
exerted by that gas.— Ans: Partial Pressure
What is the absolute pressure at 17 msw (56 fsw)?— Ans: 2.7 ata
What is the oxygen partial pressure (PO2) in EAN35 at a depth of 26 msw (85 fsw)?—
Ans: 1.3 ata
If the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw),
what is the fraction of oxygen in the mix?— Ans: .28
What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)?— Ans:
.65 ata
The symptoms of nitrogen narcosis parallel those often seen in _____.— Ans:
Alcohol Intoxication
, _____ 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."— Ans: Boyle's Law
True or False: A diver suffering from nitrogen narcosis will always be aware that
he/she is impaired.— Ans: False
The mechanisms of nitrogen narcosis are thought to be similar to:— Ans: Anesthesia
The controlled release of pressure during ascent from a scuba dive is:— Ans:
Decompression
Which gas in air is essential to sustain life?— Ans: Oxygen
The primary waste product from the metabolism of oxygen is:— Ans: Carbon
Dioxide
For most persons, symptoms of hypoxia begin to appear when the PO2:— Ans: Falls
below about 0.16 ata.
Pulmonary oxygen toxicity results from:— Ans: Prolonged exposure to elevated
oxygen partial pressures.
One of the factors that can increase susceptibility to CNS oxygen toxicity is:— Ans:
Heavy exercise and carbon dioxide buildup.
The acronym used to remember signs and symptoms of oxygen toxicity is:— Ans:
Con V E N T I D.
The recommended maximum PO2 for enriched air nitrox diving is:— Ans: 1.4 ata.
The first precursor symptom of CNS oxygen toxicity is:— Ans: Precursor symptoms
are highly variable.
A stuporous condition characterized by impaired mental and physical performance and
changes in mood and behavior is known as _____.— Ans: Nitrogen narcosis
© Get it right 2025 Getaway - Stuvia US All rights reserved
