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PN2 Comprehensive Assessment Test-Questions with
Correct Verified Answers Graded A+.
Most cylinder explosions occur ______________, requiring _____________ to safeguard the person with the high pressure cylinder. a.when subjected to fire, no smoking b.during use, a hydrostatic test c.during filling, a visual inspection d.during travel, a specialized vehicle - Answers-c.during filling, a visual inspection You anchor your 20 ft. boat and notice a leaf floating by on the ocean surface, in a tide- generated current. You count 6 seconds as you observe it moving one boat length. You do not have a boat tender. You should: a.set up for a drift dive and plan on surface swimming back to the boat when you are done b.consult the tide tables to see if this current might slacken soon, and wait for slackening current c.prepare for an easy dive by removing any excess weight from your weight belt d.none of the these choices - Answers-b.consult the tide tables to see if this current might slacken soon, and wait for slackening current The two factors having the greatest effect on gas consumption are: a.water density and temperature b.regulator performance and density of breathing gas c.age and fitness d.depth and diver activity e.lung capacity and breathing habits - Answers-d.depth and diver activity A diver should begin to equalize the pressure in the ears when: a.reaching a depth of about 30 feet b.the ears begin to hurt c.beginning to descend d.the eustachian tube opens - Answers-c.beginning to descend The driving force that causes inert gas to dissolve into the bodies tissues is a.the gradient between right and left ventricles of the heart. b.the pressure gradient between the partial pressure of inert gas in the alveoli and the partial pressure of the inert gas in the surrounding tissues. c.the difference in temperature between the surface water and the thermocline. d.the pressure difference between the alveoli and the lungs. - Answers-b.the pressure gradient between the partial pressure of inert gas in the alveoli and the partial pressure of the inert gas in the surrounding tissues. If you get caught in a rip current, you should a.swim against the current.
b.swim with the current. c.swim parallel to shore. d.swim perpendicular to shore. - Answers-c.swim parallel to shore. Unless diving with a Diving Safety Officer, what is the absolute maximum depth for a 30 ft. diver? a. 60 ft if accompanied by a diver of equal authorization b. 100 ft if accompanied by a diver of greater authorization c. 60 ft if accompanied by a diver of greater authorization d. 40 ft if accompanied by a diver of greater authorization - Answers-c. 60 ft if accompanied by a diver of greater authorization The solubility of a gas in a liquid varies in proportion to the partial pressure of that gas in the overlying space. What is this relationship is known as? a. The Henderson-Hasselbach equation. b. Dalton's Law. c. Guy-Lussac's Law. d. Henry's Law. - Answers-d.Henry's Law. It is a requirement to log your dives using your OM's logging system in order to maintain scientific diver authorization. Select one: True False - Answers-true If you are heading 170 and make a 30 turn to the right, what is your new heading: a. 200 b. 30 c. none of the these d. 140 - Answers- According to Archimedes Principle, it is the _____ of the displaced fluid that equates to how much upward force is applied to an immersed object. a.
Arterial Gas Embolism symptoms usually occur within ___ of surfacing from a dive, whereas Decompression Sickness symptoms usually occur ___. The first aid for these injury types is ____ a. 15 minutes/15 minutes to 12 hours/Completely different, and so you must identify which it is in the field b. 15 minutes/15 minutes to 12 hours/Oxygen administration and transport to additional medical care c. 30 minutes/6 hours/The same d. 15 minutes/15 minutes to 12 hours/Rest, fluids Clear my choice - Answers-b. 15 minutes/15 minutes to 12 hours/Oxygen administration and transport to additional medical care A divers ascent rate should not exceed: a. 30 feet per minute b. 90 feet per minute - Answers-a. 30 feet per minute The buoyant properties created by a neoprene wetsuit will: a.neutralize with depth. b.compensate automatically at all depths. c.decrease with depth. d.increase with depth. - Answers-c.decrease with depth. Kevin first notices Nitrogen Narcosis when he is breathing air at a depth of about 80 fsw/24.4m. What is the pN2 of the air he inhales at this depth? a. none of the these options b. 2.9 ata/bar c. 3.4 ata/bar d. 1.9 ata/bar e. 2.7 ata/bar - Answers-e. 2.7 ata/bar The magnification of visual images underwater is caused by a. Doppler shift of ambient light
b. none of the other options c. acclimation of the human eye to underwater vision d. a panic response to sighting large predators e. different refractive properties of air and water - Answers-e. different refractive properties of air and water Who is ultimately responsible for the scientific divers safety? a. The Diver b. The Lead Diver c. The Diving Control Board d. The Diving Safety Officer Clear my choice - Answers-a. The Diver If the power inflation mechanism on your BCD sticks or freezes in the fully down position during a dive, you should a.immediately disconnect the inflator hose and vent BC b.take no action as your overpressure relief valve will take care of it c.allow the BCD to fill with air and take you to the surface d.continue diving while dumping your BCD as needed - Answers-a.immediately disconnect the inflator hose and vent BC Boyle's Law states that, for a constant number of gas molecules, as the pressure increases, the volume will ___________________, so long as ___________________ remains constant. a. decrease; temperature b. decrease; density c. increase; temperature d. increase; density - Answers-a. decrease; temperature The rate of N2 absorption and elimination by the human body during a dive a.is controlled by two things: depth and dive time b.is controlled by the depth and dive time but may be modified by heavy exertion
Which of the following is often an initial and very common symptom of decompression sickness? (select all that apply) a. pain in the joints. b. bloody, frothy sputum. c. sudden unconsciousness after a dive. d. paralysis in legs. - Answers-a. pain in the joints. Oxygen toxicity can become problematic when breathing compressed air greater than _____ ATA partial pressure which occurs at a depth of _____. a.3.7, 100 fsw b.2.0, 297 fsw c.1.6, 218 fsw d.1.0, 33fsw - Answers-c.1.6, 218 fsw If a diver needs to go to 75 feet for 30 minutes and the dive computer's plan mode shows 70 feet for 30 minutes, the diver should: a. begin dive 75 feet, the plan mode was close enough b. forget about diving for the rest of the day c. do the dive but do a 5 minute safety stop instead of 3 minutes d. extend surface interval until plan mode shows at least 80 feet for 30 minutes - Answers- d. extend surface interval until plan mode shows at least 80 feet for 30 minutes A PFO can be implicated in DCI because: a.it makes the heart beat faster. b.it allows the body to absorb more nitrogen c.it provides a possible pathway for bubbles to migrate from the venous to arterial circulation. d.it provides a possible pathway for bubbles to migrate from the arterial to venous circulation - Answers-c.it provides a possible pathway for bubbles to migrate from the venous to arterial circulation. The Diving Control Board enforces diving Standards and Guidelines recommended by AAUS and _______. a.none of the above, just AAUS. b.NOAA c.SGA
d.OSHA - Answers-d.OSHA A dive plan should be based on: a.high winds and currents b.ability of the strongest/experienced diver c.depth and visibility d.ability of the weakest/inexperienced diver - Answers-d.ability of the weakest/inexperienced diver On your first dive to 115 feet, you find that your mind becomes cloudy and it is difficult to concentrate on your task. You abort the dive but during the ascent, you feel normal again. You probably experienced the effects of a.nitrogen narcosis b.immersion pulmonary edema c.carbon monoxide poisoning d.oxygen toxicity e.decompression sickness Clear my choice - Answers-a.nitrogen narcosis Check all that apply. Dive plans must include: a. Location of proposed dives. b. Proposed work, equipment, and boats to be employed. c. Divers qualifications and certification type. d. Decompression status and repetitive dive plans. - Answers-a. Location of proposed dives. b. Proposed work, equipment, and boats to be employed. c. Divers qualifications and certification type. d. Decompression status and repetitive dive plans. Treatment for nitrogen narcosis is: a.give oxygen b.immediate recompression c.ascent to shallower depths d.there is no treatment for nitrogen narcosis e.CPR - Answers-c.ascent to shallower depths An irregular breathing pattern (skip breathing) while diving will possibly cause a.carbon dioxide build-up and headaches b.joint pain
In-water rescue breaths should ideally be conducted at a rate of: a. Five breaths per minute b. One breath every 5 - 6 seconds c. 30 to 1 d. 100-120 per minute - Answers-b. One breath every 5 - 6 seconds A BCD is designed to do all of the following except a.allow you to lift heavy objects from the bottom b.provide flotation at the surface c.control the rate of descent and ascent d.allow for neutral buoyancy at depth - Answers-a.allow you to lift heavy objects from the bottom Symptoms of decompression sickness may include: a.any of the these b.none of these c.loss of feeling in some part of the body d.dizziness and vertigo e.muscle and joint pain - Answers-a.any of the these Check all statements that apply to conservative diving methodology, in regards to decompression sickness avoidance. a. Conduct deeper dives first. b. Round all dive calculations and numbers up. c. Plan around worst case scenarios. d. Ascent rates should be at least 60' per minute. - Answers-a. Conduct deeper dives first. b. Round all dive calculations and numbers up. c. Plan around worst case scenarios. The greatest rate of pressure/volume change occurs between the depths of: a.the rate is the same for each range b.0-33 feet/0-10 meters c.33-66 feet/ 10-20 meters
d.66-99 feet/ 20-30 meters - Answers-b. 0-33 feet/0-10 meters When rinsing your regulator, it is best to a.put the dust cap in place or leave the regulator attached to the tank b.have the first stage lower than the second stage c.clean the first and second stages inside and out with fresh water d.depress the purge button several times - Answers-a.put the dust cap in place or leave the regulator attached to the tank If you become separated from your buddy during the dive, you should: a.Pause to look around, then ascend and wait for them on the surface. b.Revert to a "one diver" dive plan. c.Stay down as long as you can and look for him. d.Immediately begin a search on the bottom to locate them. - Answers-a.Pause to look around, then ascend and wait for them on the surface. An altitude dive is any dive made above _____ feet/meters requiring the use of special conversion tables. a.10000'/3048m b.100'/30m c.500'/152m d.999'/304m - Answers-d.999'/304m Your computer says you have 10 minutes remaining for the dive but your buddy's computer says it is time to ascend. What should you do? a. Follow your dive buddy's computer b. Follow your computer c. Each follow your respective computers (your buddy ascends and you stay down a little longer) d. None of these options - Answers-a. Follow your dive buddy's computer When performing a quick neurological assessment, it is important to note differences in sensation or reflex reaction from: a.top to bottom b.side to side c.All of the these d.front to back - Answers-c.All of the these The immediate first aid treatment for decompression illness and/or near drowning is: a.drink fluids and get rest b.get warm and dry
should not be used below 33 feet/10 m - Answers-c. should not be used below 215 feet/65.5 m Adam surfaces from a cold dive feeling pressure behind his eyes, and reporting bloody water in his mask, but no other signs or symptoms. As team leader, you should suspect: a.Decompression Sickness b.Subcutaneous Emphysema c.Air Embolism d.Sinus Squeeze - Answers-d. Sinus Squeeze You logged 20 dives 10 months ago but have not been in the water since then. Because you haven't been in the water since then, you are not current. Select one: True False - Answers-True In order to remain active as a scientific diver, a minimum of _____ must be made each year. a.6 dives b.1 checkout dive c.two training seminars d.12 dives - Answers-d.12 dives In tissue modeling theory, when a tissue compartment has gained all the nitrogen possible it can gain, it is said to be ______. a.full b.saturated c.in decompression d.one complete half life e.at maximum j-factor - Answers-b.saturated The single most important thing when providing assistance to a panicked diver on the surface is: a.Establish positive buoyancy. b.Maintain eye contact at all times. c.Do not place yourself in jeopardy. d.Approach them from behind. - Answers-c.Do not place yourself in jeopardy. How do you prevent water from entering the scuba cylinder? a.Always leave some air pressure in the tank b.Always have the compressor filters changed by a trained technician c.Never rinse them off with fresh water d.Service your regulator frequently - Answers-a.Always leave some air pressure in the tank A cylinder documentation line reads: 3AL3000 4^17. Which of the following are true?
a. The tank's rated working pressure is 3000 psi b. Tank metal is an aluminum alloy c. It can be filled to 10% greater than its rated 3000PSI working pressure d. It is due for a hydrostatic re-test in April, 2022 - Answers-a. The tank's rated working pressure is 3000 psi d. It is due for a hydrostatic re-test in April, 2022 After surfacing a non-breathing diver, a.signal for help and begin chest compressions b.provide 1 rescue breath and begin towing towards the boat c.establish positive buoyancy, signal for help, and provide 2 rescue breaths d.establish positive buoyancy and start removing dive gear - Answers-c. establish positive buoyancy, signal for help, and provide 2 rescue breaths You are out diving with your team and the Lead Diver/Principal Investigator describes the activities for the next dive. You feel uncomfortable with some aspects of the dive plan. You should: a. conduct the dive according to the direction of the Lead Diver b. conduct the dive as you see fit c. make the Lead Diver aware of your concerns as you get in the water d. bring up your concerns and refuse to dive if you are still uncomfortable - Answers-d. bring up your concerns and refuse to dive if you are still uncomfortable Dive tables must always be present on site when conducting dives using dive tables. Select one: True False - Answers-True The portion of the tank valve damaged by over-tightening the valve knob upon shutoff is: a.The valve seat b.The burst disc c.The cone d.The dip tub - Answers-a. The valve seat During an emergency swimming ascent, your regulator should be a.held over your head
c. the exact location d. the condition of the victim - Answers-a. the number of victims b. symptoms of the victim c. the exact location d. the condition of the victim As long as a diver stays shallower than ______, the concern for decompression sickness is minimal. a.30 feet / 9m b.100 feet / 30m c.80 feet / 24m d.50 feet / 15m - Answers-a.30 feet / 9m At 99 fsw / 30m, a flexible container will be ________ of the surface volume. a.1/ b.1/ c.1/ d.1/5 - Answers-c.1/ When recovering an unconscious diver from the bottom it is important to remember that: a.You must act for them in order to prevent further injury. b.They are probably dead and you cannot harm them more. c.Never drop your weights but it is okay to drop theirs. d.Put their regulator back in if it has fallen out of their mouth and purge the regulator to clear water they may have inhaled. - Answers-a. You must act for them in order to prevent further injury. You have just attached your regulator to a new, full scuba cylinder. After pressurizing the system, you hear the sound of escaping air coming from where the regulator mates with the tank valve. You should: a.screw the regulator onto/into the tank valve as hard as you can to eliminate the leak b.check the tank o-ring for signs of wear and replace it if necessary c.remove the regulator and add a second o-ring to create a better seal between the regulator and tank valve d.quietly switch tanks and let someone else fix the problem - Answers-b. check the tank o-ring for signs of wear and replace it if necessary Full in-water CPR (compressions) is/are a.standard procedure b.only useful in surface-drowning-syndrome cases
c.not possible d.only useful in mouth-to-snorkel technique e.only able to be performed with two rescuers - Answers-c.not possible Scientific Diving is "diving performed solely as a necessary part of a scientific, research, or educational activity by employees whose sole purpose for diving is to perform scientific research tasks". Select one: True False - Answers-True In general terms, arterial gas embolism (AGE) is a condition brought on by: a.an increase in the respiratory rate b.a decrease in the respiratory rate c.excess air pressure within the lungs d.increased carbon dioxide tension in the chest - Answers-c.excess air pressure within the lungs A burst disc on a tank valve is directly activated by what? a.over-pressurization of the tank. b.a J-valve reserve device. c.extreme heat. d.extreme cold. e.a cylinder explosion - Answers-a. over-pressurization of the tank. You should drop your weights: a.when sharing air with your buddy b.to execute an emergency swimming ascent c.never, you might not find them again d.if you feel you cannot make it to the surface or a buddy - Answers-d. if you feel you cannot make it to the surface or a buddy For any decompression illness (AGE or DCS), treatment should include: a. hot compresses to relax the muscles and maintain core body temperature b. 100% Oxygen administration c. insisting the injured diver ingest fluids to speed re-hydration d. making the injured diver stand up so you can evaluate his sense of balance - Answers- b. 100% Oxygen administration A likely cause for a pneumothorax, mediastinal emphysema, and/or subcutaneous emphysema by a SCUBA diver is: a.staying down too long
d.ears during descent and may be dealt with by ascending a few feet and finishing your descent at a slower rate. - Answers-b. ears during ascent and may be dealt with by descending a few feet and completing your ascent at a slower rate. Dive tables and computers: a.should never be used to their limits b.are based on mathematical models of gas absorption. c.all of the these d.if used conservatively, can reduce the risk of decompression sickness - Answers-c. all of the these Sand ripples: a. decrease in width as you approach shore and run perpendicular to shore b. increase in width as you approach shore and run perpendicular to shore c. decrease in width (are steeper) as you approach shore and run parallel to shore d. increase in width as you approach shore and run parallel to shore - Answers-c. decrease in width (are steeper) as you approach shore and run parallel to shore Why is carbon monoxide a dangerous gas to be in a breathing gas mixture? a.CO competes with oxygen for hemoglobin binding sites in the blood and essentially causes hypoxia. b.CO is converted to oxygen when under high partial pressures and the diver suffers from oxygen toxicity. c.CO causes a fatal build up of carbon dioxide in the lungs which, when combined with the saturation of the plasma by oxygen, leads to Arterial Gas Embolism. d.None of the these - Answers-a. CO competes with oxygen for hemoglobin binding sites in the blood and essentially causes hypoxia. Objects seen underwater through a mask appear to be: a.smaller and closer b.larger and closer c.more blue and out of focus d.larger and farther away - Answers-b. larger and closer The reciprocal course for a heading of 235 is: a. 35 b. 55 c. 75 d.
155 - Answers-b. 55 A quick-release buckle is most important for which piece of equipment? a.BCD b.Fins c.Weight belt d.Backup regulator e.Mask - Answers-c. Weight belt Francois has placed a current meter in 85 fsw and he must recover it. It weighs 50 lbs when submerged (net weight). A lift bag is attached and partially inflated until the whole package is neutral. What SURFACE volume of air was added to the lift bag? a. 1.78 cu. ft. b. 0.79 cu. ft. c. impossible to determine with the given information d. 2.79 cu. ft. - Answers-d. 2.79 cu. ft. What symptom(s) may accompany a ruptured eardrum which occurs during a scuba dive? a.nausea b.blood in the external ear canal c.cold sensation in the ear canal d.all of the these e.extreme but transient dizziness - Answers-d. all of the these When breath-hold diving, hyperventilation will allow a diver to stay submerged longer by: a.equilibrating the blood with oxygen b.supersaturating the blood with oxygen c.decreasing the reflex of the diaphragm d.reducing the carbon dioxide content of the blood - Answers-d. reducing the carbon dioxide content of the blood Using the NOAA air table, what is the maximum no stop dive time for a dive to 55'/16.8m? a. A dive to this depth can be of infinite length b. 74 minutes c. 100 minutes d.
