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NAUI Instructor Exam Questions with
Complete Solution
1. Henry's Law: The amount of gas dissolved in a liquid is directly related to its partial pressure above the liquid.
2. Relationship of gas solubility and temperature: Solubility of gas decreases with increasing temperature
(INVERSELY RELATED)
3. Inert gas loading in relation to body tissue: Body tissue absorbs more inert gas as depth increases
4. Benefit of Dive Computer compared to Dive Tables: Gives the diver credit for shallow portions of the dive
5. Cold or Strenuous dive planning rule: Use the next greater dive TIME to determine letter group
6. Equilibrium as it relates to nitrogen in the body: When the pressure of nitrogen is balanced between air and your body
7. Haldane surfacing ratio: Originally 2:1 - Updated with new research to 1.58:
8. Tissue compartment half-time: 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 tissue: The maximum allowable nitrogen (inert gas) pressure in a specific tissue
10. NAUI recommendation for diving while pregnant: Do not dive while pregnant
11. Haldane tissue compartments: Haldane - 5 compartments Modern Computers -
Apx. 16 compartments
12. Tissue compartment: Mathematical model consisting of multiple theoretical tissues and their relative halftimes
Fast compartments - short halftimes Slow compartments - long halftimes
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13. Ascent rate at altitude: Slower than at sea level
14. Extend dive times with gas by: Decreased nitrogen and increased oxygen in breathing gas
15. RNT: Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
16. Procedure for missed decompression stops: 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. SIT: Surface Interval Time
Longer time at the surface allows for increased repeat dive times
18. Canadian Dive Tables published by the Defense and Civil Institute of Environ- mental Medicine (DCIEM): Based
on 20+ years of research pioneered by Kidd and Stubbs (1962)
19. Swiss Dive Tables: 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 should:: Use the Maximum Dive Time as your Total Dive Time
21. Aching pains an hour after a dive might be:: Decompression sickness
22. ATA rating for most hyperbaric chambers for treating divers:: 6 ATA
23. Haldane Tissue Half-Times (Compartments): 5, 10, 20, 40, 75 Mins
24. High altitude dive: Any dive at greater than 1000 feet
25. Ideal hyperbaric chamber for dive injury: Multiplace, double-lock chamber rated for service to six atmospheres
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40. Marking a surface position is done by: Establishing a "fix" with a set of bearings or ranges
41. Niche: The position each species occupies in it habitat
42. Lights required for a night dive: 2 per diver
43. How to mark an exit point for a night shore dive: Establishing a range with two lights placed in a line with the exit
44. Deep dive: Any dive deeper than 60 ft
45. Principle for establishing correct weight to be worn by a diver: The diver should be neutrally buoyant during the safety stop
at the end of the dive with an empty buoyancy compensator and cylinder near reserve pressure
46. Two fundamental types of search pattern: Circular and Straight
47. Pilotage: Location is confirmed with visual references
48. Reciprocal Course: An outbound course in a straight line with the return in the opposite direction along the same line
49. First step in searching for an object under water: Define the search area
50. Two types of lift bags: Open bottom & Pillow
51. Where tidal currents are significant, diving from shore should generally be conducted at or near high or
low tide because:: There is a little tidal current near slack tide
52. Trimix: 2 inert gasses & oxygen
53. Wavelength: Distance from Crest to Crest of waves
54. Cause of tides: Gravitational pull of the moon
55. 3 Tide cycles: Diurnal - 1 high 1 low per day
Semidiurnal - 2 high 2 low of equal sizes per day Mixed - 2 high 2 low of
5 / dittering sizes per day
56. Current parralell to the beach: Longshore Current
57. Primary cause of offshore currents: Wind
58. The horizontal boundary between waters of different salinity: Halocline
59. Most common plants in the ocean: Phytoplankton
60. Most common toxic poisoning in ocean fish: Ciguatera
61. Waves caused by the wind increase in size with the wind velocity, duration, and:: Fetch
62. Because of the Coriolis force, major ocean currents tend to flow:: Clockwise in the Northern Hemisphere,
counterclockwise in the Southern Hemisphere
63. The intertidal area in which plant and animals are adapted to withstand water loss, temperature
extremes, and strong water movement is termed the:: Littoral zone
64. When approaching the shore, large swells over a moderately steep bottom slope tend to cause:: Plunging
breakers
65. Apx number of high tides per 24 hr day: 2
66. The seasonal breakdown of the thermocline in a fresh water lake is termed a/an:: Turnover
67. Rip current flow: Perpendicular away from the shore
68. Red tide: Result of a plankton bloom
69. Percentage of all animal species that are invertebrates: 97%
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87. Benefit of a Capillary tube depth gage: Automatically provides equivalent depth readings when used at higher elevations
88. first stage filters that appear green in color may be an indication of what?: -
Corrosion from moisture in the cylinder
89. Boyles Law: Pressure increases as volume decreases IVERSLEY
PROPORTUNATE
90. Index marks on a compass: Temporarily mark the bearing that is indicated by the north-seeking needle
91. Where does gas exchange occur in the body: Alveolar-capillary membrane
92. Two main benefits to Nitrox: Longer dive times & Shorter SIT
93. Inert gas means: Our bodies do not use the gas
94. Daltons Law: The partial pressure of any gas in a mixture is directly related to the fraction of the gas in the total mixture
95. Central Nervous System (CNS) Oxygen Toxicity results from:: Relatively short expo- sures to high oxygen partial
pressures
96. ConVENTID (oxygen poisoning): Convulsions Vision
(blurriness) Ears (ringing) Nausea Twitching Irritability Dizziness
97. The maximum contingency partial pressure of oxygen (PO2) for diving nitrox
is: 1.6 ATA
98. MOD: Maximum Operating Depth - calculated by the partial pressure of oxygen
99. Nitrox mixing methods: Partial pressure blending Nitrogen
8 / separating membrane Continuous gas blending
100. An oxygen analyzer should display oxygen content to an accuracy of:: 1/10 of a percent
101. Kelvin scale: Absolute temperature scale based on the Celsius scale
102. Pressure: Force acting on a unit of area
103. Objects viewed through a scuba mask appear larger and closer due to?: Re- fraction
104. Archemedes Principle: "An object wholly or partially immersed in a fluid is buoyed up by a force equal to the
weight of the fluid displaced."
105. What color is absorbed first in water?: Red
106. What color is absorbed last in water?: Violet
107. How much does pressure increase under water per foot: 0.445 psi per foot (0.10 bar per meter)
108. Weight of fresh vs sea water (1 cubic ft): Fresh - 62.4 Sea - 64.
109. The pressure exerted by any component gas in a mixture: Partial pressure of that gas
110. Regulators delivery air at what pressure: Ambient pressure
111. Conduction: The transfer of heat from one objetc to another object that it is touching
112. Convection: The transfer of heat by the circulation or movement of a liquid or gas over an object
113. Normal adult respiratory rate: 12-16 breaths per minute
114. Hypoxia: Low oxygen
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130. As tissues require more oxygen, it is supplied by: Increased blood flow
131. Prior to a diving rescue, which three factors should be carefully considered by the rescuer?: Personal risk,
appropriate response, ability
132. SEABAG: Site Assessment
Emergency Plan Activity Buoyancy Air Gear and Go
133. When dealing with a diver who is unconscious at the surface, NAUI recom- mends the following steps::
Check for breathing Begin rescue breathing if necessary Begin towing the victim
134. Methods to tow a diver in a rescue situation: Wheel barrow, Do-si-do, Tank tow
135. The maximum number of students one active-status NAUI Instructor with one Assistant Instructor in
training can have in confined wateris:: 16
136. During the NAUI SCUBA Diver course how many dives can be made in a day?: 3
137. Scuba tanks should always have some pressure in them to prevent:: Moisture from entering
138. The predictable rise and fall of the ocean is: Tide
139. What is the line on a compass that mark direction of travel?: Lubber Line
140. When selecting a face mask the most important thing to consider is: Proper seal and fit
141. Most effective way to descend while maintaining orientation and attempt- ing to equalization of the
11 / ears?: Feet first
142. Sound travels how much faster in water than air?: 4 times
143. How many feet is one atmosphere of Sea vs Fresh water: Sea - 33 Fresh - 34
144. What is gauge pressure plus atmospheric pressure?: Absolute Pressure
145. Pressure of nitrogen is balanced between the air and your body: Equilibrium
146. Snorkels over 15 inches are not recommended because: Too much dead air space
147. immediately upon reaching a dive site you should: Observe conditions
148. A divers inability to equalize ears during ascent could be: a block or reverse block
149. What parameters should be established prior to every dive: Max depth, max bottom time, min air
150. A symptom of carbon monoxide poisoning is often:: Headache
151. The preferred action to take if you find yourself alone and out of air at 30 feet in open water is:: Emergency
swimming ascent (CESA)
152. Because of refraction objects in water appear: Larger Closer
153. Skip breathing could cause: Carbon dioxide excess
154. The stage of the regulator which reduces tank pressure to intermediate pressure: First Stage
155. Proper buoyancy is attained when you take a normal breath and you float at or near: Eye level
156. First aid for an unconscious diver should include considerations for: Drowning Air embolism
DCS
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163. Blood and mucus in the mask is most likely: Sinus squeeze
164. Rinsing a reg should be done: Attached to a tank or with the dust cap on
165. Gas law that explains most diving medical problems: Boyles Law
166. Two methods for measuring air pressure: BAR PSI
167. Atmospheric pressure at sea level: 1 BAR
14.7 PSI
1 ATA
168. Weights are used by divers primarily to: Ottset positive buoyancy created by wetsuit
169. Anchored boats should have: Trail line 30 meters
long with a buoy at the end
