Scuba – Flashcard
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When selecting a facemask, the most important thing to consider is:
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proper seal and fit
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Diving equipment should be:
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rinsed thoroughly, dried and stored in a cool place
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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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The primary purpose of the exposure suit is to:
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preserve body heat during dives
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offset the positive buoyancy created by the wet suit and body density are used by the diver primarily for:
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weighting systems
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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 are steel and
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aluminum
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The state of the regulator that reduces the pressure in the regulator hoses to the surrounding ambient water pressure is:
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the second stage
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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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visual inspection information, serial number, date of hydrostatic test
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stamped markings on scuba tank
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Scuba cylinders need to be visually inspected internally
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every 12 months
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When should you leave regulator attached to cylinder or have the dust cap in place
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rinsing the regulator
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Which of the following physical factors can make you incapable of sustaining the efforts sometimes demanded when participation in recreational diving: a. inadequate sleep b. head cold c. ingestion of drugs d. all of the above
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all of the above
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Physical fitness is an important consideration for scuba divers because it helps prevent diving accidents due to:
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exhaustion
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Completing the entry level certification course makes you knowledgable and skillful enough to dive safely at:
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open water with conditions similar to those in which you were trained
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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 sealed balloon filled with air that has a volume of 6 cubic inches at 99 feet will have a volume of ____ at 33 feet
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12 cubic inches
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Sea water 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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Boyle's law
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Because of refraction, objects underwater appear ___ and ____ when the diver is looking through his/her mask
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larger; closer
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A divers body heat is lost through conduction at a rate of approximately ___ times more rapidly than in air
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25
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What type of pressure is defined as gauge pressure plus atmospheric 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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A divers inability to equalize his/her ears during ascent could cause
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a block or reverse block
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A diver with blood and mucous in his/her mask upon surfacing will most likely have:
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sinus squeeze
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If a divers surface air consumption rate is 25 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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Pressure in the middle of the 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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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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An irregular breathing pattern while diving will possibly cause
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carbon dioxide excess
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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 a dive is
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red
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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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The preferred action to take if you find yourself alone and out of air at 30 feet in open water is
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emergency swimming ascent
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If during a dive you and your buddy become separated, you should:
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spend no more than one minute looking then surface
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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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If your diver buddy complains to you about having 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 depth that is equivalent to one atmosphere in the ocean is equal to ___ feet in the sea water and feet in fresh water
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33;24
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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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symptoms of nitrogen narcosis are similar to:
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alcoholic intoxication
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If you are diving wearing an exposure suit or have air in your BC, you should ___ to safely control buoyancy as you descend
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add air to your buoyancy device
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If it is suspected that the air in a tank is contaminated due to smell or taste
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do not use the tank and call dive shop
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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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when conducting a buoyancy check, neutral buoyancy or proper weighting is attained when, with a normal breath, you float at or near ___ with 500 psi in your tank
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eye level
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A diver with a group letter of F making a dive to 60 ft 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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The maximum dive time for a dive to 60 ft is ___ minutes
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55
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according to NAUI, a repetitive dive is defined as more than one dive within a period of ___ hours
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24
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the minimum surface 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 max dive time at 60 feet?
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19 minutes
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according to the NAUI dive tables dives to less than 40 feet:
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are considered a 40 foot dive
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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, minimum air pressure
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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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Bubbles form during off gassing when you
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reduce pressure by ascending too fast
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when determining your end of dive letter if you are diving in exceptionally cold water or the dive is very strenuous you should
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use the same depth with the next time block
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after a vacation where you dove 3 days in a row, 2 dives per day you must wait ___ hours before flying
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24
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when working on your tables a dive to 36 feet must be considered a dive to ___ feet
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40
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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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the predictable daily rise and fall of the ocean
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tide
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most surface waves are caused by
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wind
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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 clean, soak in hot water, obtain medical attention
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The first aid for sea stings, such as those from jellyfish is:
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the application of a stinging neutralizing agent
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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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which of the following will help to prevent seasickness
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settle yourself in a midway point of the boat
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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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currents which suddenly appear and disappear are
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transitory
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___ underwater movement of water cause by the wave action that you will experience when diving in areas close to shore
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surge
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four main actions you should consider in giving first aid for diving accidents are
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maintain basic life support, call for help, treat for shock, deliver 100% oxygen
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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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____ is a worldwide emergency network of hyperbaric chambers and diving physicians
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divers alert network
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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
