NAUI Nitrox Exam Prep Q&A 2026/2027

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NAUI Nitrox Exam Prep (New 2024/ 2025
Update) Questions and Verified Answers|
100% Correct| A Grade
QUESTION
The Signs and Symptoms of DCS Do Not Vary and Can Be Easily Identified No Matter The
Injury or Severity of The Case (T/F)


Answer:
False



QUESTION
Central nervous system toxicity


Answer:
CNS toxicity can result from relatively short exposures to high partial pressures of oxygen.



QUESTION
The other type is called pulmonary toxicity or whole body toxicity


Answer:
Pulmonary toxicity results from prolonged exposure to elevated partial pressures of oxygen
(above about 0.5 atmosphere). As the name implies, its most pronounced effects are on the lungs,
producing signs and symptoms such as chest tightness, breathing discomfort and pain, shortness
of breath, and coughing. Development of pulmonary toxicity requires long-term exposures such
as encountered in saturation diving, certain military and commercial diving, or recompression
chamber treatment.



QUESTION
Pulmonary toxicity is not a concern of the recreational nitrox diver; CNS toxicity is a concern.




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Answer:




QUESTION
Using the NOAA Oxygen Exposure limits the 24 hour limit at the maximum recreational partial
pressure of oxygen (PPO2) is 200 minutes (T/F)


Answer:
False



QUESTION
Match each statement True or False:


Answer:
The mechanisms of nitrogen narcosis are thought to be similar to Anethesia: True

A diver suffering from nitrogen narcosis will always be aware that he/she is impaired: False

Argon in air is essential to sustain life: False

The primary waste product from the metabolism of oxygen is Carbon dioxide: True

A stuporous condition characterized by impaired mental and physical performance and changes
in mood and behavior is known as nitrogen narcosis: True



QUESTION
For most persons, symptoms of hypoxia begin to appear when the PO2
______________________


Answer:
Falls below about 0.16 ata



QUESTION
The acronym used to remember signs and symptoms of oxygen toxicity is:




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Answer:
Con-Convulsions
V-Visual
E-Ears
N-Nausea
T-Twitching
I-Irritability
D-Dizziness



QUESTION
The Recommended maximum PO2 for recreational enriched air nitrox diving is ___________
with a contingency of __________________


Answer:
1.4, 1.6



QUESTION
The first precursor symptoms of CNS oxygen toxicity is ___________________________


Answer:
Highly Variable



QUESTION
The ODIGTML order was originally determined to account for the most potentially serious
physiological concerns facing every diver on every dive (T/F)


Answer:
T



QUESTION
Calculating maximum operating depth with EAN 36:




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