2024-2025 NAUI Physics Diver Master Exam With Answers (132 Solved Questions)

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NAUIDiverMasterExam(New2024/ 2025Update) Questions and Verified Answers|100% Correct|AGradeQUESTIONWhat is the difference in weight between three cubic feet (85 liters) of fresh water and the samevolume of sea water?Answer:4.8 pounds (2.2 kg)QUESTIONA dive team wants to recover (lift) a 380 pound (172 kg)(dry weight) anchor from the bottom ofthe ocean. The anchor displaces 3 cubic feet (85 liters) of sea water. The bottom composition isflat and firm. How many lift bags, rated for 50 pounds (23 kg) of lift each, will it take to recover(lift) the anchor?Answer:4 bagsQUESTIONThe pressure exerted by any component gas in a mixture is termed the _____ of that gas.Answer:Partial pressureQUESTIONThe air (or other breathing mixture) that a diver breathes at depth is delivered to the diver by theregulator at _____.Answer:

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Ambient pressureQUESTIONWhich of the following is an example of an injury explained by or attributed to Boyle's Law?Answer:Equalization of air spacesReverse blocksLung rupture injuriesQUESTIONOne way that heat loss occurs during diving activity is through _____.Answer:ConductionQUESTIONHenry's Law states that the amount of gas that will dissolve into a solution is _____ proportionalto the partial pressure of that gas and _____ proportional to the absolute temperature.Answer:directly; inverselyQUESTIONThe absolute pressure at 75 feet (23 meters) of sea water is:Answer:3.27 ata/48.07 psia/3.3 barQUESTION

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A sealed flexible container with 10 liters of air in it is submerged to a depth of 82 feet (25meters) in the ocean. Providing there is no temperature change in the water between the surfaceand at 82 feet (25 meters), what is the new volume in the container at 82 feet (25 meters)?Answer:2.87QUESTIONAn air consumption rate of 40 psig (2.76 bar) per minute using a 3,000 psig/80 cubic foot (207bar/11 liter wet volume) cylinder is equal to?Answer:1.07 cubic feet per minute (30 liters per minute)QUESTIONIf a diver has a Surface Air Consumption rate of 30 psig (2.07 bar) per minute with an 80 cubicfoot/3000 psig (207 bar/11 liter wet volume) cylinder, the same cylinder will last approximately_____ minutes at a depth of 90 feet (27 meters) of sea water ifthe diver begins his/her ascentwith 1000 psig (69 bar) remaining as a safety measure.Answer:18QUESTIONIf a cylinder contains 80 cubic feet (2265 liters) of air at a pressure of 3000 psig (207 bar),approximately how many cubic feet (liters) of air remains in the cylinder at a pressure of 2200psig (152 bar) if the cylinder temperature remains constant?Answer:58.6 cubic feet (1659 liters)QUESTION

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The partial pressure of oxygen in air at a depth of 132 feet (40 meters) of sea water is _____.Answer:1.05 ata/15.42 psia/1.06 barQUESTIONA dive team diving in a fresh water lake in the summer is at a depth of 20 feet (6 meters). Thewater temperature at this depth is 85 degrees Fahrenheit (29 degrees Celsius) and one diver in theteam has 244 cubic inches (4 liters) of air in her buoyancy compensator (BC). As the teamdescends to a depth of 60 feet (18 meters), they pass through a thermocline and the watertemperature is now 55 degrees Fahrenheit (12 degrees Celsius). If the diver with 244 cubicinches (4 liters) of air in her BC did not addor remove any air from the compensator, the newvolume in her BC after arrival at 60 feet (18 meters) would be how many cubic inches (liters)?Answer:132 cubic inches/2.16 litersQUESTIONAs we inhale air, it moves from the nose and the mouth to the _____ into the two _____ andfinally to the microscopic _____.Answer:Trachea, bronchi, alveoliQUESTIONThe stimulus to breath results primarily from _____ in the bloodstream.Answer:Carbon dioxideQUESTION_____ is the biggest breath you can exhale.

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Answer:Vital capacityQUESTIONThe risk of carbon dioxide buildup while scuba diving can usually be forestalled by _____.Answer:Avoiding slow or shallow breathingMaintaining a normal breathing patternBeing in shape for the exertion demanded by the dive plannedQUESTIONExcess breathing resistance can be caused by improperly tuned regulators and small boresnorkels.Answer:TrueQUESTIONLoss of consciousness on ascent in shallow water while breathhold diving is known as _____.Answer:Shallow water blackoutQUESTIONHyperventilation lowers the _____ in your body, the reverse of _____ buildup. _____ signalsyour body to breathe, and below a certain level of _____ you do not feel the urge to breathe.Answer:CO2

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QUESTIONWhich symptom is reflective of oxygen toxicity?Answer:Muscular twitchingQUESTIONThe best way to prevent overexertion is to _____.Answer:Exercise, Swim regularly with fins, Get in shapeQUESTIONCarbon monoxide levels in the blood are elevated by smoking cigarettes.Answer:trueQUESTIONWhat is the term for a clinical condition that follows suffocation by submersion in liquid afterwhich there are at least 24 hours of survival?Answer:Near DrowningQUESTIONThe onset of nitrogen narcosis is characterized by _____.

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Answer:Impairment of thoughtQUESTIONIf the elimination of gas is not fast enough to match a diver's ascent, the excessivesupersaturation of gas in tissues may cause gas to come out of solution in the form of bubbles.This malady is called _____.Answer:Decompression sicknessQUESTIONWhat are the primary types of decompression sickness (DCS)?Answer:Musculoskeletal; Central Nervous SystemQUESTIONTo reverse a lower leg or foot cramp, _____.Answer:Stretch the muscles and tendons by pulling the tip of the fin toward the kneeQUESTIONA hood or tight seal can fool your carotid sinus baroreceptors into thinking that there is highblood pressure by pushing on them.Answer:True

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QUESTIONCompressing your carotid arteries too much can make you _____.Answer:Dizzy, or even unconsciousQUESTIONWhich malady is a result of pulmonary overinflation during ascent?Answer:Arterial gas embolismQUESTIONEmergency treatment in the field for arterial gas embolism and decompression sickness includes_____.Answer:Having the victim breathe 100% oxygen, maintain basic life support, treat for shock, initiatetransport to a hospital with a hyperbaric chamberQUESTIONPhysical damage to the body resulting from a direct change in pressure is called _____.Answer:BarotraumaQUESTIONClinical Hypothermia occurs when the core temperature of the human body falls below whattemperature?Answer:

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95 Fahrenheit (35 CelsiusQUESTIONA pressure buildup in the ear during ascent can produce a condition known as _____.Answer:Alternobaric vertigoQUESTION_____ is a loss of your sense of direction or position.Answer:DisorientationQUESTIONSmoking cigarettes effects a diver in which of the following ways?Answer:Increases the level of carbon monoxide in the blood..QUESTIONGood aerobic fitness increases _____.Answer:Your tolerance to coldQUESTIONThe current recommendation regarding pregnancy and diving, is for women _____.

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