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NAUI Final Exam QUESTIONS & ANSWERS(2024 latest update) When selecting a face mask, most important thing to consider is - ANSWER proper seal and fit When buying or renting equipment for diving the most important consideration is - ANSWER it fits your body Open heel fins are usually the fins of choice for scuba divers because: - ANSWER They may be used in a wide variety of environmental conditions factors that can affect the breathing ease of a snorkel are: - ANSWER Length and Diameter Snorkels over 15 inches in length are not recommended primarily because: - ANSWER They have too much dead air space Diving equipment should be: - ANSWER rinsed thoroughly, dried and stored in a cool place Scuba tanks should always have some pressure in them to prevent: - ANSWER Moisture from entering Two types of materials that scuba tanks are made from are steel and _________. - ANSWER aluminum Hydrostatic and visual inspection standards are different around the world.Consult your local NAUI facility to learn about the regulations in your area - ANSWER True Engraved markings on scuba tanks include - ANSWER Date of hydrostatic test, serial number, type of material The ____ line is the direction of travel line on the compass - ANSWER Lubber You should have your regulator serviced by a certified repair technician: - ANSWER As recommended by the manufacturer A ___ is suitable for warm, tropical diving - ANSWER Dive skin A ____ is made from foam neoprene - ANSWER Wetsuit A ____ uses undergarments for insulation - ANSWER Dry suit An additional accessory that will be useful to you is - ANSWER underwater slate, goodie bag, spare parts (all the above) the dive knife is used primarily as a _____ for digging, cutting, pounding, and prying - ANSWER Tool you should record all dives in your logbook because - ANSWER Required to show proof, laws required, review logbook, all the above When you fly a dive flag, you must - ANSWER Dive near, remove flag, fly from surface, all of the above If you must walk in fins, you must walk ____ - ANSWER backwards The ___ clear of your snorkel requires least amount of energy - ANSWER Displacement Two recommended methods of clearing your snorkel are the blast and the _____ clear. - ANSWER Displacement The primary purpose of the exposure suit is to - ANSWER Preserve body heat during dives You do not need special training to user a dry suit - ANSWER False examples of natural navigation aids divers may use during dives include - ANSWER Ripple marks, sun brightness, bottom contours, all of the above A reciprocal course is made when your outbound course is a straight line and halfway through your dive you make a ____ turn - ANSWER 180 Because of refraction, objects underwater appear _________ and _________ when the diver is looking through his/her mask. - ANSWER larger/closer A diver's body heat is lost through conduction (primarily) at a rate of approximately _________ times more rapidly than in air. - ANSWER 25 The first color lost in the spectrum upon descent during a dive is _____. - ANSWER red sound travels about ____ times faster in water than in air - ANSWER 4 during descent, a divers buoyancy tends to - ANSWER decrease if you are diving wearing an exposure suit, you should ____ to safely control buoyancy as you descend - ANSWER add air to your buoyancy device If you are weighted to be neutral in salt water and you dive in fresh water with the same amount of weight, you will float. - ANSWER False Your body weight does not affect your buoyancy - ANSWER False Which gas law best explains diving medical problems such as ear and sinus squeeze? - ANSWER Boyles law If a diver's surface air consumption rate is 1.72bar (25 psi) per minute, what would be the consumption rate at 20meteres (66 feet) of seawater? - ANSWER 5.16 bar per minute 75 psi per minute Two methods of measuring air pressure are BAR or: - ANSWER pounds per square inch A depth that is equivalent to one atmosphere in the ocean is equal to _________ feet in sea water and _________ feet in fresh water. - ANSWER 10m 33 feet ; 10.4 34 feet in the ocean a sealed balloon filled with air that has a volume of 98 cubic centimeters 6 cubic inches at 30 meters 99 feet will have a volume of ____ at 10 meters 33 feet - ANSWER 196 cubic centimeters 12 cubic inches Sea water weighs ___ kilograms per liter or ___ pounds per cubic foot - ANSWER 1.025 / 64.0 atmospheric pressure at sea level is: - ANSWER 1.0 bar / 14.7 pounds per square inch/1.0 atmosphere absolute The absolute pressure in the ocean at 16 meters 53 feet is - ANSWER 2.6 atmospheres absolute what type of pressure is defined as gauge water pressure plus atmospheric air pressure - ANSWER absolute A diver with blood and mucous in his/her mask upon surfacing will most likely have: - ANSWER sinus squeeze A divers inability to equalize his/hers ears during ascent could cause - ANSWER A block or reverse block Pressure in the middle ear is equalized through a part of the body called the: - ANSWER eustachian tube the three general types of injury resulting from lung overexpansion are air embolism, pneumothorax and _________ - ANSWER tissue emphysema to prevent air embolism a diver should - ANSWER Breathe normally at all times during ascent and never hold his/her breath A regular breathing pattern while diving would be: - ANSWER slightly slower and deeper than you normally breathe An irregular breathing pattern (skip breathing) while diving will possibly cause: - ANSWER carbon dioxide excess If your dive buddy complains to you about having aching pain in his/her shoulder one hour after the dive, you might suspect: - ANSWER decompression sickness When the pressure of nitrogen is balanced between the air and your body, you are at a state of ____ - ANSWER equilibrium A symptom of carbon monoxide poisoning is often: - ANSWER headache If it is suspected that the air in a tank is contaminated due to its smell or taste: - ANSWER Do not use the tank and immeditaly call the dive shop that filled the tank symptoms of nitrogen narcosis are similar to - ANSWER alcoholic intoxication The amount of water vapor in the air is known as - ANSWER Humidity You can prevent a mask from fogging under water by lowering the ___ of the water - ANSWER surface tension if the temperature surrounding a rigid container full of gas increases, the pressure of the gas increases - ANSWER true Specific rules for that particular table use are found on the back of each table - ANSWER True Dive computers though expensive, enhance divers safety by tracking their depth and time more accurately - ANSWER True computers and dive tables will eliminate the risk of DCs - ANSWER False It is recommended that you not consume alcohol within ____ hours of a planned dive - ANSWER 12 When planning and executing a dive, it is important for diving buddies to: - ANSWER agree on a dive leader Immediately upon reaching the dive site, you should - ANSWER Observe conditions Which of the following limits should be established prior to every scuba dive - ANSWER Maximum bottom time, maximum depth, maximum pressure You should have a contingency plan for - ANSWER each step of your dive plan which of the following will help to prevent seasickness - ANSWER settle yourself in a midway point of the point To relieve a cramp in the calf - ANSWER Bend the toe of the fin toward the knee to stretch the muscle A diver experiencing panic should - ANSWER stop, rest and breathe slowly and deeply until you recover Continued loss of body heat in cold water will produce: - ANSWER ramps, immobility, pain, all the above Which of the following most readily provides assistance to a diver - ANSWER The diving buddy Whenever possible, it is best to talk a distressed diver through solving their own minor difficulties - ANSWER True Most diving problems occur - ANSWER At the surface Four main actions you should consider in giving first aid for diving accidents are - ANSWER Maintain basic life support, call for help, treat for shock, deliver 100% oxygen Appropriate first aid measures for decompression sickness DCS include - ANSWER lie victim down, maintain circulation and respiration, administer 02 if qualified ____ is a worldwide emergency network of hyperbaric chambers and fiving physicians - ANSWER Diver Alert Network (DAN) Which of the following is an example of an overhead environment - ANSWER Ice Which of the following is an example of a natural site - ANSWER Coral reef Which of the following is an example of a man-made site? - ANSWER breakwater If you receive your entry-level training in a tropical environment and then move or travel to a northern environment - ANSWER Contac active instructor to orient you Which of the following affect visibility - ANSWER bottom comp, season, water movement Which of the following is the point at which a sudden change in water temperature occurs - ANSWER A thermocline A thermocline is a thin zone of radical change in water - ANSWER Temperature A _____ plan is a written plan of your destination and your expected time of return that is left with someone on shore so they can summon help if you do not return within a reasonable time. - ANSWER Float almost all injuries from aquatic life are caused by _____ action on the part of the animal. - ANSWER Defensive It is recommended that a dive team diving from an anchored boat begin their dive - ANSWER against the prevailing current ___ is the underwater movement of water caused by wave action that you will experience when diving in areas close to shore - ANSWER Surge The predictable daily rise and fall of the ocean at a single point is called: - ANSWER The tide Most surface waves are caused by: - ANSWER Wind It is recommended that a dive team diving from an anchored boat have - ANSWER A trail line 30 meters long with a buoy at the end Currents which suddenly appear and disappear are - ANSWER transitory Local dive clubs are an excellent way to - ANSWER all the above which of the following are NAUI-Sanctioned Specialty Courses - ANSWER All the above