NAUI Scuba Diver Exam – Flashcards
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When selecting a face mask, the most important thing to consider is:
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Proper seal and fit.
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Snorkels over 15 inches in length are not reccomended primarily because:
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They have too much dead air space.
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When buying or renting scuba equipment for diving, Space the most pertinent consideration is
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it's fit on your body
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When rinsing a regulator it is best to
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leave the regulator attached to the tank four have the dust cat in place
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Diving equipment should be
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rinse thoroughly, dried and stored in a cool place.
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Scuba tank should always have some pressure and then to prevent
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moisture from entering.
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According to the Department of Transportation regulations, scuba tanks must be hydrostatically tested every
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5 years
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Open heel fins are usually the sense of choice for scuba divers because
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they may be used in a wide variety of environmental conditions.
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The primary purpose of the exposure suit is to
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preserve heat during dives.
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Weighting systems are used by the diver primarily to
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offset the positive buoyancy created by the wet suit.
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You should have your regulator serviced by certified repair technician
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at least once per year.
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The stage of the regulator, which reduces tank pressure, is
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the first stage.
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Two types of materials that scuba tanks are made from our steel and
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aluminum.
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The ___________ line is the direction of travel line on the compass
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lubber
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The dive knife is used primarily as a ___________ for digging, cutting, pounding, and prying
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Tool
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Stamped (engraved) markings on scuba tanks include
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date of hydrostatic test, serial number, and type of material.
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Atmospheric pressure at sea level is
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14.7 pounds per square inch/1.0 atmosphere absolute
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A seal balloon filled with air that has a volume of 6 in.³ at 99 feet will have a volume of ______ at 33 feet
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12 in.³
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Seawater weighs
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64.0 pounds per cubic foot
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Which gas law best explains diving medical problems such as ear and sinus squeeze
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Boyles Law
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Because every fraction, objects underwater appear ___________ and ______ when the diver is looking through his or her mask
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larger; closer
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When the pressure of nitrogen is balanced between the air and your body, you are at a state of
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equilibrium
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A divers body heat is lost through conduction (primarily) at a rate of approximately ___________ times more rapidly than an air
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25
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What type of pressure is defined as gauge (water) pressure plus atmospheric (air) pressure
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absolute
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The absolute pressure in the ocean at 53 feet is
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2.6 atmospheres absolute
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If a diverse surface air consumption rate is 2.5 PSI per minute, what would be the consumption rate at 66 feet of seawater
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75 PSI per minute
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A depth that is equivalent to one atmosphere in the ocean is equal to ___________ feet in seawater and __________ feet and fresh water
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33; 34
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Two methods of measuring air pressure are BAR or
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pounds per square inch
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Sound travels about _____ times faster in water than in air
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4
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The first color lost in the spectrum upon descent during dives is
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red
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Pressure and the middle ear is equalized through a part of the body called the
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Eustachian tube
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Breathing dry air, a scuba diver tends to become dehydrated while diving due to
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moisturizing dry inhaled air
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Symptoms of nitrogen narcosis are similar to
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alcoholic intoxication
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A divers inability to equalize his or her ears during an ascent could cause
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a block or reverse block
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An irregular breathing pattern (skip breathing) while diving will possibly cause
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Carbon dioxide excess
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Generally, for maximum efficiency, your breathing should be
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slightly slower and deeper than you normally breathe
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To prevent air embolism, a diver should
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breathe normally at all times during ascent and never hold his/her breath
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A diver with blood and mucus in his/her mask upon surfacing will most likely have
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Sinus squeeze
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If your dive buddy complains to you about having an aching pain in his/her shoulder one hour after the dive, you might suspect
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decompression sickness
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A symptom of carbon monoxide poisoning is often
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headache
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The following rate of ascent for diving is acceptable when using the USN/NAUI dive tables
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30 feet per minute
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Which of the following is the point at which a sudden change in water temperature occurs
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thermocline
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Currents which suddenly appear and disappear are
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transitory
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_______ Is the underwater movement of water caused by wave action that you will experience when diving in areas close to shore
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Surge.
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The predictable daily rise and fall of the ocean at a single point is called
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The tide.
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Most surface waves are caused by
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wind
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Examples of natural navigation aids divers may use during dives include
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ripple marks in the sand, sun brightness/available light, and bottom contours.
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Almost all injuries from aquatic life are caused by _______ action on the part of the animal
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defensive
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To render first aid for venomous fish wounds
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flush the wound to clean, soak in hot water, obtain medical attention
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The first aide for sea stings, such of those from jellyfish is
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The application of a stinging neutralizing agent
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A diver with a group letter of "F" making a dive to 60ft. has a residual nitrogen time of
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36 minutes.
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It is advisable that a sport/recreational diver
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avoid decompression dives
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For optimum no-decompression bottom times, plan repetitive dives so that each successive dive is to _______ depth
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a shallower
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The maximum dive time for a dive to 60 feet is
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55 minutes
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The minimum surface interval required to avoid stage decompression after a dive to 88 feet for 18 minutes, followed by a guide to 78 feet for 23 minutes is
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3 hr., 58 minutes.
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According to NAUI, a repetitive dive is defined as more than one dive within a period of
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24 hours
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The minimum service interval recommended between two dives is _______ minutes
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60
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Your first dive is to 60 feet for 50 minutes. You spend one hour and 40 minutes on the surface, what is your adjusted maximum dive time 60 feet
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19 minutes
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A buddy team in a NAUI Master Scuba Diver Course makes an ocean dive to 95 feet for 20 minutes. After a surface interval of two hours and 35 minutes, they make a repetitive dive to 70 feet for 24 minutes. They remain on the surface for two hours and 51 minutes before diving to 45 feet. What is their adjusted maximum dive time for the third dive
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51 minutes
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According to the NAUI dive tables dives to less than 40 feet
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are considered as 40 foot dives
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Appropriate first aid measures for an unconscious scuba diver should include consideration of
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drowning, air embolism and decompression sickness
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Four main actions you should consider in giving first aid for a diving accident are
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maintain basic life support, call for help, treat for shock, and deliver 100% oxygen
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Which of the following will help to prevent seasickness
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settle your self in a midway point of the boat
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The preferred action to take if you find yourself alone in out of air at 30 feet in open water is
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Emergency swimming ascent
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If you're diving wearing an exposure suit, you should __________ to safely control buoyancy as you descend
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add air to your buoyancy device
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Which of the following limits should be established prior to every scuba dive
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maximum bottom time, maximum depth, and minimum air pressure
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Which of the following physical factors can make you incapable of sustaining the efforts sometimes demanded from participating in recreational diving
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inadequate sleep, the recent head cold, recent digestion of drugs
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Which of the following most readily provides assistance to a diver
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the diving buddy
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A diver experiencing panic should
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stop, rest and breathe slowly and deeply until you recover
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Which is the most effective way to descend while maintaining orientation and attempting equalization of the ears
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Feet first
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Continued loss of body heat in cold water will produce
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muscle cramps, progressive immobility, and insensibility to pain
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Physical fitness is an important consideration for scuba divers because it helps to prevent driving accidents due to
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exhaustion
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When conducting a buoyancy check, neutral buoyancy or proper weighting is attained when, with a normal breath, you float at or near
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eye level
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______ is a worldwide emergency network of hyperbaric chambers and diving physicians
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Divers Alert Network (DAN)
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It is recommended that a dive team diving from an anchored boat have
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a trail line 30meters long with a buoy at the end
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It is recommended that a dive team diving from an anchored boat begin their dive
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against the prevailing current
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If gearing a dive you and your buddy become separated, you should
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spend no more than one minute looking and then surface
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To relieve a cramp in the calf
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bend the toe of the fin toward the knee to stretch the muscle
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A diver on the surface waving his/her hand overhead and thrashing violently indicates
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distress
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Immediately upon reaching the dive site, you should
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observe conditions
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Completing this entry-level scuba certification course makes you knowledgeable and skillful enough to drive safely in or at
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Open water with conditions similar to those in which you were trained
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If you receive your entry level training in the surf of California and then moved to Boston, the best way of becoming familiar with the diving procedures specific to Boston in the east coast area is to
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contact and active, preferably NAUI, instructor in Boston and dive with him/her
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When planning and executing a dive, it is important for diving buddies to
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agree on a dive leader
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The last thing to check before making a giant stride or any water entry is that
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area below is clear
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If it is suspected that the air and in a tank is contaminated due to it smell or taste
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do not use the tank and immediately called the dive shop that filled the tank so they can investigate the problem
