NAUI Nitrox Exam Prep (New 2025-2026
Update) Questions and Verified Answers
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.
,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:
, 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:
Update) Questions and Verified Answers
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.
,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:
, 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:
