NAUI INSTRUCTOR PRACTICE QUESTIONS
WITH CORRECT ANSWERS
1. Henry's LawANSWERS The amount of gas dissolved in a liquid is directly related to its partial pressure above th
liquid.
2. Relationship of gas solubility and temperatureANSWERS Solubility of gas decreases with
increasing temperature
(INVERSELY RELATED)
3. Inert gas loading in relation to body tissueANSWERS Body tissue absorbs more inert
gas as depth increases
4. Benefit of Dive Computer compared to Dive TablesANSWERS Gives the diver credit
for shallow portions of the dive
5. Cold or Strenuous dive planning ruleANSWERS Use the next greater dive TIME to determine lett
group
6. Equilibrium as it relates to nitrogen in the bodyANSWERS When the pressure of nitrogen is
balanced between air and your body
7. Haldane surfacing ratioANSWERS Originally 2ANSWERS1 - Updated with new research to
1.58ANSWERS1
8. Tissue compartment half-timeANSWERS The time required for the compartment to absorb or
eliminate half of the pressure ditterence between what it started with and the ambient pressure
9. M-Value of tissueANSWERS The maximum allowable nitrogen (inert gas) pressure in a specific tissue
10. NAUI recommendation for diving while pregnantANSWERS Do not dive while
pregnant
11. Haldane tissue compartmentsANSWERS Haldane - 5
compartments Modern Computers - Apx. 16 compartments
12. Tissue compartmentANSWERS Mathematical model consisting of multiple theoretical tissues and their
relative halftimes
Fast compartments - short halftimes
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,Slow compartments - long halftimes
13. Ascent rate at altitudeANSWERS Slower than at sea level
14. Extend dive times with gas byANSWERS Decreased nitrogen and increased oxygen in breathing g
15. RNTANSWERS Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
16. Procedure for missed decompression stopsANSWERS Remain out of the water, rest,
breathe 100% oxygen, drink fluids, be monitored for signs of decompression illness, transported to a hyperbaric
facility if symptoms arise
17. SITANSWERS Surface Interval Time
Longer time at the surface allows for increased repeat dive times
2/
17
, 18. Canadian Dive Tables published by the Defense and Civil Institute of Environ-
mental Medicine (DCIEM)ANSWERS Based on 20+ years of research pioneered by Kidd and Stubbs
(1962)
19. Swiss Dive TablesANSWERS Developed by A.A. Bühlmann at the University of Zurich - EXTENDED TO
INCLUDE ALTITUDE DIVING
20. If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes
your Total Dive Time to exceed the Dive Time Limits, you
shouldANSWERSANSWERS Use the Maximum Dive Time as your Total Dive Time
21. Aching pains an hour after a dive might beANSWERSANSWERS Decompression
sickness
22. ATA rating for most hyperbaric chambers for treating
diversANSWERSANSWERS 6 ATA
23. Haldane Tissue Half-Times (Compartments)ANSWERS 5, 10, 20, 40, 75 Mins
24. High altitude diveANSWERS Any dive at greater than 1000 feet
25. Ideal hyperbaric chamber for dive injuryANSWERS Multiplace, double-lock chamber rated for
service to six atmospheres
26. Repetitive DiveANSWERS Any dive started within 24 hours after a previous dive
27. NAUI recommended minimum SIT timeANSWERS 60 mins
28. Dives shallower than 40 ft are considered how deep on NAUI Dive
TablesANSWERS 40 ft
29. How long after diving should you wait to flyANSWERS 24 hrs
30. Can NAUI Dive Tables be applied for decompression of an altitude
dive?ANSWERS No
31. Who created the RGBM TablesANSWERS Bruce R. Wienke
3/
17
WITH CORRECT ANSWERS
1. Henry's LawANSWERS The amount of gas dissolved in a liquid is directly related to its partial pressure above th
liquid.
2. Relationship of gas solubility and temperatureANSWERS Solubility of gas decreases with
increasing temperature
(INVERSELY RELATED)
3. Inert gas loading in relation to body tissueANSWERS Body tissue absorbs more inert
gas as depth increases
4. Benefit of Dive Computer compared to Dive TablesANSWERS Gives the diver credit
for shallow portions of the dive
5. Cold or Strenuous dive planning ruleANSWERS Use the next greater dive TIME to determine lett
group
6. Equilibrium as it relates to nitrogen in the bodyANSWERS When the pressure of nitrogen is
balanced between air and your body
7. Haldane surfacing ratioANSWERS Originally 2ANSWERS1 - Updated with new research to
1.58ANSWERS1
8. Tissue compartment half-timeANSWERS The time required for the compartment to absorb or
eliminate half of the pressure ditterence between what it started with and the ambient pressure
9. M-Value of tissueANSWERS The maximum allowable nitrogen (inert gas) pressure in a specific tissue
10. NAUI recommendation for diving while pregnantANSWERS Do not dive while
pregnant
11. Haldane tissue compartmentsANSWERS Haldane - 5
compartments Modern Computers - Apx. 16 compartments
12. Tissue compartmentANSWERS Mathematical model consisting of multiple theoretical tissues and their
relative halftimes
Fast compartments - short halftimes
1/
17
,Slow compartments - long halftimes
13. Ascent rate at altitudeANSWERS Slower than at sea level
14. Extend dive times with gas byANSWERS Decreased nitrogen and increased oxygen in breathing g
15. RNTANSWERS Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
16. Procedure for missed decompression stopsANSWERS Remain out of the water, rest,
breathe 100% oxygen, drink fluids, be monitored for signs of decompression illness, transported to a hyperbaric
facility if symptoms arise
17. SITANSWERS Surface Interval Time
Longer time at the surface allows for increased repeat dive times
2/
17
, 18. Canadian Dive Tables published by the Defense and Civil Institute of Environ-
mental Medicine (DCIEM)ANSWERS Based on 20+ years of research pioneered by Kidd and Stubbs
(1962)
19. Swiss Dive TablesANSWERS Developed by A.A. Bühlmann at the University of Zurich - EXTENDED TO
INCLUDE ALTITUDE DIVING
20. If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes
your Total Dive Time to exceed the Dive Time Limits, you
shouldANSWERSANSWERS Use the Maximum Dive Time as your Total Dive Time
21. Aching pains an hour after a dive might beANSWERSANSWERS Decompression
sickness
22. ATA rating for most hyperbaric chambers for treating
diversANSWERSANSWERS 6 ATA
23. Haldane Tissue Half-Times (Compartments)ANSWERS 5, 10, 20, 40, 75 Mins
24. High altitude diveANSWERS Any dive at greater than 1000 feet
25. Ideal hyperbaric chamber for dive injuryANSWERS Multiplace, double-lock chamber rated for
service to six atmospheres
26. Repetitive DiveANSWERS Any dive started within 24 hours after a previous dive
27. NAUI recommended minimum SIT timeANSWERS 60 mins
28. Dives shallower than 40 ft are considered how deep on NAUI Dive
TablesANSWERS 40 ft
29. How long after diving should you wait to flyANSWERS 24 hrs
30. Can NAUI Dive Tables be applied for decompression of an altitude
dive?ANSWERS No
31. Who created the RGBM TablesANSWERS Bruce R. Wienke
3/
17
