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NAUI Instructor Exam: Questions and Answers,
Exams of Medicine 2025/2026 Graded A+| Validate
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Henry's Law - ANSWER -The amount of gas dissolved in a liquid is directly related to its partial pressure above the liquid. Relationship of gas solubility and temperature - ANSWER - Solubility of gas decreases with increasing temperature (INVERSELY RELATED) Inert gas loading in relation to body tissue - ANSWER -Body tissue absorbs more inert gas as depth increases Benefit of Dive Computer compared to Dive Tables - ANSWER - Gives the diver credit for shallow portions of the dive Cold or Strenuous dive planning rule - ANSWER -Use the next greater dive TIME to determine letter group Equilibrium as it relates to nitrogen in the body - ANSWER -When the pressure of nitrogen is balanced between air and your body Haldane surfacing ratio - ANSWER -Originally 2:1 - Updated with new research to 1.58: Tissue compartment half-time - ANSWER -The time required for the compartment to absorb or eliminate half of the pressure difference between what it started with and the ambient pressure
M-Value of tissue - ANSWER -The maximum allowable nitrogen (inert gas) pressure in a specific tissue NAUI recommendation for diving while pregnant - ANSWER -Do not dive while pregnant Haldane tissue compartments - ANSWER -Haldane - 5 compartments Modern Computers - Apx. 16 compartments Tissue compartment - ANSWER -Mathematical model consisting of multiple theoretical tissues and their relative halftimes Fast compartments - short halftimes Slow compartments - long halftimes Ascent rate at altitude - ANSWER -Slower than at sea level Extend dive times with gas by - ANSWER -Decreased nitrogen and increased oxygen in breathing gas RNT - ANSWER -Residual Nitrogen Time Tme already spent at the repetitive dive depth (dive tables) Procedure for missed decompression stops - ANSWER -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
Ideal hyperbaric chamber for dive injury - ANSWER -Multiplace, double-lock chamber rated for service to six atmospheres Repetitive Dive - ANSWER -Any dive started within 24 hours after a previous dive NAUI recommended minimum SIT time - ANSWER -60 mins Dives shallower than 40 ft are considered how deep on NAUI Dive Tables - ANSWER -40 ft How long after diving should you wait to fly - ANSWER -24 hrs Can NAUI Dive Tables be applied for decompression of an altitude dive? - ANSWER -No Who created the RGBM Tables - ANSWER -Bruce R. Wienke Repetitive Dives must be - ANSWER -Shallower than the previous dive Minimun SIT for RGBM tables - ANSWER -One hour NAUI Safety Stop - ANSWER -15 fsw (4.5 msw)/3 minutes RGBM Sea Level Tables can be used up to what altitude - ANSWER -2000 ft (610 meters)
RGBM Table Options - ANSWER -0 - 2000 ft 2000 - 6000 ft 6000 - 10000 ft Due to the difference in density of fresh water and ocean water, divers should adjust their ballast weight by adding or subtracting - ANSWER -About 2.5% of the combined weight of their dive gear and body weight Lubber line - ANSWER -Indicates the course or bearing the user will follow Stationary reference line on compass Basic types of compass - ANSWER -Direct and Indirect reading Marking a surface position is done by - ANSWER -Establishing a "fix" with a set of bearings or ranges Niche - ANSWER -The position each species occupies in it habitat Lights required for a night dive - ANSWER -2 per diver How to mark an exit point for a night shore dive - ANSWER - Establishing a range with two lights placed in a line with the exit Deep dive - ANSWER -Any dive deeper than 60 ft
3 Tide cycles - ANSWER -Diurnal - 1 high 1 low per day Semidiurnal - 2 high 2 low of equal sizes per day Mixed - 2 high 2 low of differing sizes per day Current parralell to the beach - ANSWER -Longshore Current Primary cause of offshore currents - ANSWER -Wind The horizontal boundary between waters of different salinity - ANSWER -Halocline Most common plants in the ocean - ANSWER -Phytoplankton Most common toxic poisoning in ocean fish - ANSWER -Ciguatera Waves caused by the wind increase in size with the wind velocity, duration, and: - ANSWER -Fetch Because of the Coriolis force, major ocean currents tend to flow: - ANSWER -Clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere The intertidal area in which plant and animals are adapted to withstand water loss, temperature extremes, and strong water movement is termed the: - ANSWER -Littoral zone
When approaching the shore, large swells over a moderately steep bottom slope tend to cause: - ANSWER -Plunging breakers Apx number of high tides per 24 hr day - ANSWER - The seasonal breakdown of the thermocline in a fresh water lake is termed a/an: - ANSWER -Turnover Rip current flow - ANSWER -Perpendicular away from the shore Red tide - ANSWER -Result of a plankton bloom Percentage of all animal species that are invertebrates - ANSWER -97% Strongest areas for river currents - ANSWER -Surface, in the middle, along outside edges in bends Epilimnion - ANSWER -Sun-warmed waters of lakes and quarries form an upper layer of water during the summer What causes higher than normal spring tides - ANSWER -When the solar tide reinforces and amplifies the lunar tide Beaufort Scale - ANSWER -Scale for measuring wind force/speed
Alpha flag represents - ANSWER -A vessel restricted in its ability to maneuver Which of the following is not part of the cylinder valve? - ANSWER -Diaphragm Burst disc assembly - ANSWER -Prevents cylinder rupture in the event of over pressurization Benefit of a Capillary tube depth gage - ANSWER -Automatically provides equivalent depth readings when used at higher elevations first stage filters that appear green in color may be an indication of what? - ANSWER -Corrosion from moisture in the cylinder Boyles Law - ANSWER -Pressure increases as volume decreases IVERSLEY PROPORTUNATE Index marks on a compass - ANSWER -Temporarily mark the bearing that is indicated by the north-seeking needle Where does gas exchange occur in the body - ANSWER -Alveolar- capillary membrane Two main benefits to Nitrox - ANSWER -Longer dive times & Shorter SIT
Inert gas means - ANSWER -Our bodies do not use the gas Daltons Law - ANSWER -The partial pressure of any gas in a mixture is directly related to the fraction of the gas in the total mixture Central Nervous System (CNS) Oxygen Toxicity results from: - ANSWER -Relatively short exposures to high oxygen partial pressures ConVENTID (oxygen poisoning) - ANSWER -Convulsions Vision (blurriness) Ears (ringing) Nausea Twitching Irritability Dizziness The maximum contingency partial pressure of oxygen (PO2) for diving nitrox is - ANSWER -1.6 ATA MOD - ANSWER -Maximum Operating Depth - calculated by the partial pressure of oxygen Nitrox mixing methods - ANSWER -Partial pressure blending Nitrogen separating membrane Continuous gas blending
The pressure exerted by any component gas in a mixture - ANSWER -Partial pressure of that gas Regulators delivery air at what pressure - ANSWER -Ambient pressure Conduction - ANSWER -The transfer of heat from one objetc to another object that it is touching Convection - ANSWER -The transfer of heat by the circulation or movement of a liquid or gas over an object Normal adult respiratory rate - ANSWER -12-16 breaths per minute Hypoxia - ANSWER -Low oxygen Apoxia - ANSWER -No oxygen Secondary drowning - ANSWER -Death as a result of fluid build up in the lungs Signs of nitrogen narcosis - ANSWER -Impaired judgment, decreased motor skills, euphoria Frenzel maneuver - ANSWER -The nostrils are pinched closed and an attempt is made to produce a 'k' or 'guh' sound
Valsalva maneuver - ANSWER -A forceful attempt of exhalation against a closed airway, usually done by closing one's mouth and pinching one's nose shut while expelling air out as if blowing up a balloon. Toynbee Maneuver - ANSWER -Swallowing while nose is blocked Subcutaneous Emphysema - ANSWER -Air under the skin (DCS) Medistinal Emphysema - ANSWER -Air between chest and lungs (DCS) Pneumothorax - ANSWER -Collapsed lung Air outside the lung but within in the pleural cavity Air Embolism - ANSWER -The presence of air in the veins, which can lead to cardiac arrest if it enters the heart (DCS) Shock symptoms - ANSWER -Restlessness or irritability, pale, cool and moist skin, and rapid breathing and pulse Heat stroke symptoms - ANSWER -Hot, dry skin, dilated pupils, and unconsciousness Tidal Volume (TV) - ANSWER -Amount of air inhaled or exhaled in a normal breath
Methods to tow a diver in a rescue situation - ANSWER -Wheel barrow, Do-si-do, Tank tow The maximum number of students one active-status NAUI Instructor with one Assistant Instructor in training can have in confined wateris: - ANSWER - During the NAUI SCUBA Diver course how many dives can be made in a day? - ANSWER - Scuba tanks should always have some pressure in them to prevent: - ANSWER -Moisture from entering The predictable rise and fall of the ocean is - ANSWER -Tide What is the line on a compass that mark direction of travel? - ANSWER -Lubber Line When selecting a face mask the most important thing to consider is - ANSWER -Proper seal and fit Most effective way to descend while maintaining orientation and attempting to equalization of the ears? - ANSWER -Feet first Sound travels how much faster in water than air? - ANSWER - times
How many feet is one atmosphere of Sea vs Fresh water - ANSWER -Sea - 33 Fresh - 34 What is gauge pressure plus atmospheric pressure? - ANSWER - Absolute Pressure Pressure of nitrogen is balanced between the air and your body - ANSWER -Equilibrium Snorkels over 15 inches are not recommended because - ANSWER -Too much dead air space immediately upon reaching a dive site you should - ANSWER - Observe conditions A divers inability to equalize ears during ascent could be - ANSWER -a block or reverse block What parameters should be established prior to every dive - ANSWER -Max depth, max bottom time, min air A symptom of carbon monoxide poisoning is often: - ANSWER - Headache The preferred action to take if you find yourself alone and out of air at 30 feet in open water is: - ANSWER -Emergency swimming ascent (CESA)
If wearing an exposure suit you should do what as you descend to control buoyancy - ANSWER -Add air to BCD Open heal fins are best for SCUBA because - ANSWER -Wide variety of uses Currents that suddenly appear and disappear are - ANSWER - Transitory and Surge Blood and mucus in the mask is most likely - ANSWER -Sinus squeeze Rinsing a reg should be done - ANSWER -Attached to a tank or with the dust cap on Gas law that explains most diving medical problems - ANSWER - Boyles Law Two methods for measuring air pressure - ANSWER -BAR PSI Atmospheric pressure at sea level - ANSWER -1 BAR 14.7 PSI 1 ATA
Weights are used by divers primarily to - ANSWER -Offset positive buoyancy created by wetsuit Anchored boats should have - ANSWER -Trail line 30 meters long with a buoy at the end
