NAUI NITROX DIVER EXAM REVIEW
QUESTIONS AND ANSWERS
The ______ in the air you are breathing limits the time you can stay at depth -
answer-nitrogen
In the early twentieth century, a quantitative model for nitrogen loading and dive
tables were developed by -answer-john scott haldane
We say that nitrogen is an inert gas. This means -answer-our bodies do not use the
nitrogen we breathe
Credit for developing and introducing nitrox diving techniques for standard scuba
goes to -answer-dr. Morgan wells
Naui sanctioned enriched air nitrox training in -answer-1992
Two benefits of diving with nitrox are -answer-longer dive times and shorter surface
intervals
What does the "x" stand for in the term eanx? -answer-the percentage of oxygen in
the mix
In 1878, paul bert established that_____, liberated as bubbles following sudden
decompression was the cause of decompression sickeness -answer-nitrogen
Nitrox is a _____ breathing gas -answer-mid-range
Nitrox provides the greatest advantages for dives in the _____ depth range -answer-
15-33 m (50-110 ft)
As a gas is heated in a rigid closed container its pressure will -answer-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? -answer-henry's law
Atmospheric pressure can be measured in many ways. What is one atmosphere in
millimeters of mercury? -answer-760 mmhg
The ____ of a specific gas in a mix is the portion of the total pressure exerted by that
gas -answer-partial pressure
What is the absolute pressure at 17 msw (56 fsw)? -answer-2.7 ata
What is the oxygen partial pressure in ean35 at a depth of 26 msw (85 fsw)? -
answer-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? -answer-0.28
What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? -answer-
0.65 ata
The symptoms of nitrogen narcosis parallel those often seen in -answer-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." -answer-boyle's
Each 10 meters (33 feet) that you descend in the ocean adds another atmosphere of
pressure to the one atmosphere of surface pressure -answer-true
A diver suffering from nitrogen narcosis will always be aware that he is impaired -
answer-false
The mechanisms of nitrogen narcosis are thought to be similar to -answer-
anesthesia
The controlled release of pressure during ascent from a scuba dive is -answer-
decompression
Which gas in air is essential to sustain life? -answer-oxygen
The primary waste product from the metabolism of oxygen is -answer-carbon dioxide
For most people, symptoms of hypoxia begin to appear when the po2 -answer-falls
below about 0.16 ata
Pulmonary oxygen toxicity results from -answer-prolonged exposure to elevated
oxygen partial pressures
One of the factors that can increase susceptibility to cns oxygen toxicity is -answer-
heavy exercise and carbon dioxide buildup
The acronym used to remember signs and symptoms of oxygen toxicity is -answer-
conventid
The recommended maximum po2 for enriched air nitrox diving is -answer-1.4 ata
The first precursor symptom of cns oxygen toxicity is -answer-precursor symptoms
are highly variable
A stuporous condition characterized by impaired mental and physical performance
and changes in mood and behavior is known as -answer-nitrogen narcosis
QUESTIONS AND ANSWERS
The ______ in the air you are breathing limits the time you can stay at depth -
answer-nitrogen
In the early twentieth century, a quantitative model for nitrogen loading and dive
tables were developed by -answer-john scott haldane
We say that nitrogen is an inert gas. This means -answer-our bodies do not use the
nitrogen we breathe
Credit for developing and introducing nitrox diving techniques for standard scuba
goes to -answer-dr. Morgan wells
Naui sanctioned enriched air nitrox training in -answer-1992
Two benefits of diving with nitrox are -answer-longer dive times and shorter surface
intervals
What does the "x" stand for in the term eanx? -answer-the percentage of oxygen in
the mix
In 1878, paul bert established that_____, liberated as bubbles following sudden
decompression was the cause of decompression sickeness -answer-nitrogen
Nitrox is a _____ breathing gas -answer-mid-range
Nitrox provides the greatest advantages for dives in the _____ depth range -answer-
15-33 m (50-110 ft)
As a gas is heated in a rigid closed container its pressure will -answer-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? -answer-henry's law
Atmospheric pressure can be measured in many ways. What is one atmosphere in
millimeters of mercury? -answer-760 mmhg
The ____ of a specific gas in a mix is the portion of the total pressure exerted by that
gas -answer-partial pressure
What is the absolute pressure at 17 msw (56 fsw)? -answer-2.7 ata
What is the oxygen partial pressure in ean35 at a depth of 26 msw (85 fsw)? -
answer-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? -answer-0.28
What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? -answer-
0.65 ata
The symptoms of nitrogen narcosis parallel those often seen in -answer-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." -answer-boyle's
Each 10 meters (33 feet) that you descend in the ocean adds another atmosphere of
pressure to the one atmosphere of surface pressure -answer-true
A diver suffering from nitrogen narcosis will always be aware that he is impaired -
answer-false
The mechanisms of nitrogen narcosis are thought to be similar to -answer-
anesthesia
The controlled release of pressure during ascent from a scuba dive is -answer-
decompression
Which gas in air is essential to sustain life? -answer-oxygen
The primary waste product from the metabolism of oxygen is -answer-carbon dioxide
For most people, symptoms of hypoxia begin to appear when the po2 -answer-falls
below about 0.16 ata
Pulmonary oxygen toxicity results from -answer-prolonged exposure to elevated
oxygen partial pressures
One of the factors that can increase susceptibility to cns oxygen toxicity is -answer-
heavy exercise and carbon dioxide buildup
The acronym used to remember signs and symptoms of oxygen toxicity is -answer-
conventid
The recommended maximum po2 for enriched air nitrox diving is -answer-1.4 ata
The first precursor symptom of cns oxygen toxicity is -answer-precursor symptoms
are highly variable
A stuporous condition characterized by impaired mental and physical performance
and changes in mood and behavior is known as -answer-nitrogen narcosis
