Scuba Diving Safety and Equipment, Exams of Sport Studies

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Naui Scuba Diving QUESTIONS & ANSWERS(Latest update) This on-line curriculum is meant to supplement face-to-face instruction with a qualified NAUI Instructor. - ANSWER True The acronym SCUBA stands for: - ANSWER Self-contained underwater breathing apparatus The scuba cylinder provides the diver with compressed: - ANSWER Air By diving with a submersible pressure gauge (monitoring regularly) and with a buddy equipped with a back-up air source there is little risk of running out of air while scuba diving: - ANSWER True The NAUI Scuba Diver certification is your "license to ________" and is only the beginning of your scuba education. - ANSWER Learn Scuba diving is a "thinking person's" sport and as such __________ should be avoided before scuba diving. - ANSWER Any drugs that alter behavior Scuba diving like any physical activity has risks; which can include serious injury or even death. - ANSWER True As a scuba diver, you must be willing to accept the risks of the sport and to take responsibility for your own actions. - ANSWER True There are very few "absolute contraindications" to scuba diving, but ______________ is one. - ANSWER Pregnancy If you self-report any medical condition that may place you at risk for scuba diving your instructor will ignore it and continue with the course instruction. - ANSWER False Scuba diving is often easy (physically) but can sometimes be very strenuous; particularly if you are diving in cold water, making beach entries through surf, or _______________. - ANSWER diving against a current The most common materials for scuba cylinders are _______________. - ANSWER aluminum and steel The tank valve is opened by turning it clockwise. - ANSWER False Scuba cylinders contain many stamped markings with _________, ___________, and ___________ being the most important. - ANSWER hydrostatic test date, serial number, and material Scuba cylinders must have a visual inspection (external and internal) by a certified cylinder inspector: - ANSWER At least once a year Steel scuba cylinders are less likely to rust than aluminum so keeping air in them during storage is less important than with aluminum cylinders. - ANSWER False The two main components of a scuba regulator are the first and second stages. - ANSWER True The pressure surrounding your body (on the surface or underwater) is called ________ pressure. - ANSWER Ambient The first state of the regulator reduces the high pressure (3,000 psi) in the cylinder down to approximately 150 psi. - ANSWER True The high-pressure port on the first stage is the attachment point for which device? - ANSWER SPG The second stage reduces the air pressure from the first stage pressure down to ambient pressure. - ANSWER True A disadvantage to aluminum as a tank material is its tendency to rust quickly if water gets inside. - ANSWER False When the partial pressure of nitrogen in a diver's body is balanced with the pressure of nitrogen in the air being breathed then there is a state of ______________________. - ANSWER equilibrium If the pressure on the body is lowered too quickly, excess nitrogen absorbed by a diver can come out of solution within the tissues (forming bubbles) and cause decompression sickness. - ANSWER true The process of the body absorbing excess nitrogen into the tissues is called __________________. - ANSWER ingassing Recreational dive tables are based on dive research by _____________________. - ANSWER the US Navy The abbreviation, RNT, stands for ___________________ and is a type of "penalty" for breathing compressed air underwater. - ANSWER residual nitrogen time The NAUI dive tables consist of how many different tables? - ANSWER 3 The time that you spend on the surface between dives is called the _______________. - ANSWER surface interval time The red circled numbers on Table 1 are MDT's for dives between 40 and 130 feet. What does MDT stand for? - ANSWER maximum dive time A repetitive dive is any dive made within ______________ hours of a previous dive. - ANSWER 24 When you ascend (come to the surface) you should come up in the water no faster than _______ ft per minute. - ANSWER 30 When planning (or making) a series of dives in a day you should make the first dive the deepest and each dive thereafter progressively shallower. - ANSWER true At the end of every dive should make a Precautionary Decompression Stop (aka Safety Stop) at a depth of _____ feet for ______ minutes. - ANSWER 15, 3 The first step to solving a problem underwater is to ___________________. - ANSWER stop what you're doing Which of the following is NOT a symptom of heat exhaustion? - ANSWER shivering If your skin is dry and hot to the touch you may be suffering from ________________, which is a life- threatening condition. - ANSWER heat stroke To relieve a cramp in your calf you should vigorously pull on the fin tip as you straighten your leg. - ANSWER false Flashlight failure on a night dive or stirred up sediment can lead to sensory deprivation. - ANSWER true A stuck power-inflator mechanism can lead to an over-inflated BC, which can be dangerous because...? - ANSWER it can cause an uncontrolled ascent If you get entangled in fishing line and your buddy can't help you then you can remove your scuba unit, free the entanglement and put the unit back on. - ANSWER true One way to reduce the likelihood of seasickness is to go below deck in a darkened room. - ANSWER false If your dive buddy is having problems at the surface, you should do all of the following except____________. - ANSWER swim up close and hand them your air supply DAN is a worldwide emergency network that provides assistance to divers. DAN stands for ____________. - ANSWER divers alert network The first rule of first aid is to "Do minimal harm." - ANSWER false Everyone should be prepared to administer first aid and CPR. - ANSWER true Toxins from poisonous fish (barbs or spines) can be neutralized by immersing the wound in hot water (not scalding hot). - ANSWER true First aid for an air embolism includes all of the following except __________________. - ANSWER taking the diver back down to depth to relieve the symptoms Any diving environment that does not allow direct vertical access to the surface is called an overhead environment and is not advised for recreational scuba divers. - ANSWER true When planning to dive in a new area all of the following are recommended sources of information except __________. - ANSWER somebody sitting at the local pub A thin zone in freshwater lakes where the warm surface water changes rapidly to a colder, deeper layer is called _____. - ANSWER a thermocline The underwater back-and-forth movement of water felt when diving close to shore is called ____________. - ANSWER surge Tides are caused by the gravitational attraction between the Earth, Moon, and the Sun. - ANSWER true A line floating behind an anchored boat provides a safe place to grab if you surface behind the boat. That line is called a ___________ line. - ANSWER trail All of the following are types of currents except __________________. - ANSWER transitional To escape a rip current you should swim toward the shore - ANSWER false The technique of handling an out-of-air emergency by dropping your weights and floating to the surface is call an ESA, or emergency swimming ascent. - ANSWER false A diver should not fly for at least _______ hours after repetitive dives to ensure that they have offgassed all additional nitrogen absorbed during their dives. - ANSWER 24 Planned decompression dives are considered technical dives, which are strongly discouraged for recreational scuba divers due to the greatly increased safety risks. - ANSWER true The first step in long-range planning is to determine the ______________ of your dive (trip). - ANSWER objective It is strongly encouraged to not consume alcohol within ________ hours of a planned dive. - ANSWER 12 You should pack your dive gear in the reverse order in which you will use it. - ANSWER true In the acronym SEABAG, the "S" stands for ________________ - ANSWER site survey In the acronym SEABAG, the "E" stands for _______________ plan. - ANSWER emergency In the acronym SEABAG, the "A" stands for ______________. - ANSWER activity Every dive should have a chosen "dive leader" who is often the person most familiar with the planned dive site and conditions. - ANSWER true As part of planning for any dive, you and your partner should agree on depth, time, and air supply (at what psi you'll end your dive). - ANSWER true It is recommended that you wait until the end of a dive trip to record (log) all the dives that you've made on the trip. - ANSWER false Divers should always, "Plan their dive, and dive their plan". - ANSWER true Which of the following is NOT a symptom of hypothermia? - ANSWER sweating In an out-of-air emergency, which list below shows the preferred order of the methods (best to worst)? - ANSWER contingency air, octopus method, buddy breathing, ESA, EBA. Two key safety skills are the ability to share air and to perform ESA's. - ANSWER true If you lose your dive buddy, you should get vertical in the water, search for them or their bubbles in a 360 degree circle, then ascend about 10 ft and repeat the pattern. If you still don't find them you should return to the bottom and search further. - ANSWER false A hand slashing across the throat is the underwater signal for: - ANSWER I'm out of air! Underwater hand signals should be displayed clearly and get a response from the intended audience. - ANSWER true On the surface, waving with your arms is a good way to say, "Hello...I'm OK". - ANSWER false Which of the following are useful forms of natural navigation while diving? - ANSWER direction of surge, ripple marks in the sand, rock formations The direction of travel line on a dive compass is also known as: - ANSWER a lubber line Freshwater weighs 64 lbs. per cubic ft. and salt water weighs 62.4 lbs. per cubic ft. - ANSWER false Air is a mixture of gases in the following proportions: - ANSWER 78% N2, 21% O2, and 1% miscellaneous gases Both air and water are easily compressed - ANSWER false Due to refraction (the bending of light), objects underwater appear 1/4 closer than they would at the same distance above water. - ANSWER false Due to the greater density of water (than air), the colors in the visible light spectrum get "filtered" out underwater. As you dive deeper more and more colors disappear. The first color to get filtered out is: - ANSWER red Dive lights are used for night dives, but if used during daylight dives they will bring back the colors filtered out by the water. - ANSWER true Because of water's increased density (compared to air) sound travels faster underwater...in fact, too fast for your ears and brain to determine the direction of the sound. This is because sound waves underwater travel about 5 times faster than in air. - ANSWER false "Diver Down" flags are displayed on the surface when divers are in the water in order to provide a place for boats to tie up to. - ANSWER false Divers can reduce drag (due to water resistance) by - ANSWER streamlining themselves and their equipment Wetsuits and drysuits are used by scuba divers to conserve body warmth. This is necessary, particularly in cold water, due to water's ability to conduct heat from your body _________ times faster than air. - ANSWER 25 If an object displaces an amount of water that weighs more than the object does, the object is said to be ___________ buoyant. - ANSWER positively A diver's buoyancy is affected by the diver's body density (weight/volume ratio), the equipment worn (BC, tank, wetsuit), and the breathing pattern. - ANSWER true The weight of the atmosphere on each of us can be measured in units called pounds per square inch, or PSI. The atmosphere pushes down on us with a pressure of: - ANSWER 14.7 psi