NAUI Nitrox Diver Final Test Questions with
100% Correct Answers
Nitrogen
The main reason to dive with "nitrox" is to reduce exposure to some of the problems in
diving caused by:
Our bodies do not use the nitrogen we breathe.
We say that nitrogen is an inert gas. This means_____.
Narcosis
What is the primary safety hazard of breathing nitrogen at depth?
1992
NAUI sanctioned enriched air nitrox training in:
Extended bottom time
Increased safety margins
Shorter surface intervals
Benefits of nitrox include:
15- 33 msw (50-110 fsw)
The greatest advantages for diving using nitrox occur in what depth range?
False
True or False: A scuba diver breathing nitrox avoids any risk of nitrogen narcosis.
0.36
If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas mix?
, Boyle's Law
_____ describes the relationship between absolute pressure and the volume of a gas.
Multiply the gas fraction by the absolute pressure.
To find the partial pressure of a gas in a mixture:
Absolute pressure
The water pressure plus atmospheric pressure equals:
4.4 ata
What is the absolute pressure at 34 msw (111 fsw)?
2.3 ata
What is the nitrogen partial pressure (PN2) in EAN35 at a depth of 26 msw (85 fsw)?
1.4 ata
What is the oxygen partial pressure (PO2) of EAN38 at 27 msw (87 fsw)?
54 msw (178 fsw)
At what depth in the ocean is the absolute pressure 6.4 ata?
0.35
If the PO2 at 30 msw (98 fsw) is 1.4 atmospheres, what is the oxygen fraction of the
breathing mixture?
3.9 ata
What is the partial pressure of nitrogen in air at 40 msw (130 fsw)?
False
100% Correct Answers
Nitrogen
The main reason to dive with "nitrox" is to reduce exposure to some of the problems in
diving caused by:
Our bodies do not use the nitrogen we breathe.
We say that nitrogen is an inert gas. This means_____.
Narcosis
What is the primary safety hazard of breathing nitrogen at depth?
1992
NAUI sanctioned enriched air nitrox training in:
Extended bottom time
Increased safety margins
Shorter surface intervals
Benefits of nitrox include:
15- 33 msw (50-110 fsw)
The greatest advantages for diving using nitrox occur in what depth range?
False
True or False: A scuba diver breathing nitrox avoids any risk of nitrogen narcosis.
0.36
If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas mix?
, Boyle's Law
_____ describes the relationship between absolute pressure and the volume of a gas.
Multiply the gas fraction by the absolute pressure.
To find the partial pressure of a gas in a mixture:
Absolute pressure
The water pressure plus atmospheric pressure equals:
4.4 ata
What is the absolute pressure at 34 msw (111 fsw)?
2.3 ata
What is the nitrogen partial pressure (PN2) in EAN35 at a depth of 26 msw (85 fsw)?
1.4 ata
What is the oxygen partial pressure (PO2) of EAN38 at 27 msw (87 fsw)?
54 msw (178 fsw)
At what depth in the ocean is the absolute pressure 6.4 ata?
0.35
If the PO2 at 30 msw (98 fsw) is 1.4 atmospheres, what is the oxygen fraction of the
breathing mixture?
3.9 ata
What is the partial pressure of nitrogen in air at 40 msw (130 fsw)?
False
