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Which symptom is reflective of oxygen toxicity? - โ โ Muscular twitching
Which technique is effective for controlling the ascent of an unconscious diver? - โ โ Do-si-do technique
Which type of ascent should be used only if a diver believes that he or she is incapable of swimming to the surface? - โ โ Emergency Buoyant Ascent
Which valve is an example of a special scuba valve that is required for certain types of specialty diving such as deep diving with a single cylinder? - โ โ Y valve
Which valve is unaffected by cylinder air pressure with regard to the force needed to operate the valve? - โ โ Balanced
A dive team diving in a fresh water lake in the summer is at a depth of 20 feet (6 meters). The water temperature at this depth is 85 degrees Fahrenheit (29 degrees Celsius) and one diver in the team has 244 cubic inches (4 liters) of air in her buoyancy compensator (BC). As the team descends to a depth of 60 feet (18 meters), they pass through a thermocline and the water temperature is now 55 degrees Fahrenheit ( degrees Celsius). If the diver with 244 cubic inches (4 liters) of air in her BC did not add or remove any air from the compensator, the new volume in her BC after arrival at 60 feet (18 meters) would be how many cubic inches (liters)? - โ โ 132 cubic inches/2.16 liters
A dive team executes a dive and accidentally exceeds their planned actual dive time by 5 minutes. Their actual dive profile was 110 feet ( meters) for 20 minutes. What required decompression schedule should the team follow during their ascent? - โ โ A 5 minute stop at 15 feet (5 meters)
A dive team executes a dive to 110 feet (33 meters) of sea water for an actual dive time of 15 minutes. The team has a surface interval of 1 hour and 30 minutes. What is the adjusted maximum dive time available to the team on a repetitive dive to a depth of 65 feet (20 meters) of sea water? - โ โ 25 minutes
A dive team spends their first 10 minutes of actual dive time during a dive at 70 feet (21 meters) of sea water. The next 20 minutes are spent at a depth of 40 feet (12 meters). What is the dive team's letter group after surfacing? - โ โ F
A dive team wants to recover (lift) a 380 pound (172 kg)(dry weight) anchor from the bottom of the ocean. The anchor displaces 3 cubic feet (85 liters) of sea water. The bottom composition is flat and firm. How many lift bags, rated for 50 pounds (23 kg) of lift each, will it take to recover (lift) the anchor? - โ โ 4 bags
A hood or tight seal can fool your carotid sinus baroreceptors into thinking that there is high blood pressure by pushing on them. - โ โ True
A marine animal whose tissues are toxic, either in part or entirety is _____. - โ โ Poisonous
A pressure buildup in the ear during ascent can produce a condition known as _____. - โ โ Alternobaric vertigo
Besides your basic diving gear, which of the following pieces of equipment are needed for a search and light-salvage operation? - โ โ Lift bag and a separate air supply for lifting.
Carbon monoxide levels in the blood are elevated by smoking cigarettes.
Clinical Hypothermia occurs when the core temperature of the human body falls below what temperature? - โ โ 95 Fahrenheit (35 Celsius
Compressed air, the gas that is primarily used by recreational divers, is composed of: - โ โ 78.04% nitrogen, 20.94% oxygen, .033% carbon dioxide, and .934% inert gas
Compressing your carotid arteries too much can make you _____. - โ โ Dizzy, or even unconscious
Conditions permitting, on descent most divers pause at _____ to do a quick buddy check and verify dive equipment operation/security. - โ โ 15-33 feet (5-10 meters)
Currents in bodies of water are formed by _____. - โ โ Surface winds, The rotation of the earth, The influence of the sun and moon
Density is defined as the _____ per unit _____ of a substance - โ โ mass; volume
Diving compasses need to be equipped with a(n) _____ that is aligned with the user to obtain and follow a course or bearing. - โ โ Lubber line
Dry suits form a waterproof barrier, but require undergarments to be effective in cold water - โ โ True
During a night dive, the "distress" signal is expressed by the following movement pattern of a diver's light _____ - โ โ Rapidly swinging your light in an overhead arc
During ascent from any dive in excess of 40 feet (12 meters), divers are encouraged to make a safety stop at _____ for one minute and a precautionary stop between _____ for three to five minutes. - โ โ One half the deepest depth of the dive, 10 feet (3 meters)/20 feet ( meters)
Emergency treatment in the field for arterial gas embolism and decompression sickness includes _____. - โ โ Having the victim breathe 100% oxygen, maintain basic life support, treat for shock, initiate transport to a hospital with a hyperbaric chamber
Enriched-air Nitrox (EAN 32), also known as NOAA Nitrox I, is a gas mixture that consists of ____% oxygen and ____% nitrogen. - โ โ 32; 68
Excess breathing resistance can be caused by improperly tuned regulators and small bore snorkels. - โ โ True
Five personal limitations that must be considered prior to executing a deep dive are: - โ โ Emotional status, health/fitness, training, experience, equipment.
For dives in the depth range between 60 and 130 feet (18 and 40 meters), primary personal diving equipment should be upgraded to include: - โ โ A primary cylinder equipped with a "Y" or "H" valve or a secondary scuba cylinder which is small (approx. 15 cubic feet/ liters) with its own regulator.
depth of 90 feet (27 meters) of sea water if the diver begins his/her ascent with 1000 psig (69 bar) remaining as a safety measure. - โ โ 18
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require cleaning by a process called: - โ โ Tumbling
If the elimination of gas is not fast enough to match a diver's ascent, the excessive supersaturation of gas in tissues may cause gas to come out of solution in the form of bubbles. This malady is called _____. - โ โ Decompression sickness
If the time between dives is less than 10 minutes, the surface interval is _____. - โ โ Ignored
If the water conditions are reasonable to make a beach dive, all of the following procedures are suggested: - โ โ Having your buoyancy compensator partially inflated for slight positive buoyancy.
Being fully equipped.
Getting as close to the water's edge as possible after timing the sets and lulls to match your entry with the smallest waves.
Entering the water as quickly as possible immediately after a wave breaks, getting beyond the surf zone quickly, before the next wave breaks.
In order to make an informed decision on equipment purchase, you need to have a solid educational background concerning the _____ of diving equipment: - โ โ Types, Method of operation, Care and maintenance
In the event of a regulator first stage malfunction, which type of valve design would be likely to eliminate air flow to the diver? - โ โ Upstream
Increased stress during a deep dive can result in mental and perceptual narrowing. This perceptual narrowing may create "task-loading" which can involve which of the following? - โ โ The effects of narcosis
It is the responsibility of each diver to determine individually the amount of weight that is required to neutralize positive buoyancy (if present) in the water prior to any dive. The guiding principle for this determination should be to use the _____ amount of weight that will provide _____ buoyancy at 15 feet (5 meters) of depth with an empty buoyancy compensator (BC) and a nearly empty cylinder. - โ โ minimum; neutral
Loss of consciousness on ascent in shallow water while breathhold diving is known as _____. - โ โ Shallow water blackout
Non-technical recreational divers should avoid exceeding no- decompression limits for the maximum depth of any dive. - โ โ true
On a dive charter, you might expect wetsuits to be allowed in the _____, but not in the _____. - โ โ Galley; bunkrooms
One disadvantage of _____ keels is that they allow more bounce in swells and wind chop, causing a harsher ride. - โ โ Inflatable
One of the six steps recommended by NAUI in the preparation for a rescue is _____. - โ โ Completion of NAUI Scuba Rescue Diver course
Technical divers use methods and equipment that have been borrowed from commercial and military operations. Technical diving requires more ________, _________, and _________ than does traditional sport diving. - โ โ training, preparation, equipment
The _____ tables were validated using Doppler measurements of "silent bubbles," and should provide the best margin of safety based on human experiment. - โ โ DCIEM
The absolute pressure at 75 feet (23 meters) of sea water is: - โ โ 3.27 ata/48.07 psia/3.3 bar
The air (or other breathing mixture) that a diver breathes at depth is delivered to the diver by the regulator at _____. - โ โ Ambient pressure
The best way to prevent overexertion is to _____. - โ โ Exercise, Swim regularly with fins, Get in shape
The classic Haldane ratio of 2:1 pressure reduction has been shown to be too liberal and has been modified to about _____. - โ โ 1.58:
The current recommendation regarding pregnancy and diving, is for women _____. - โ โ Not to dive
The distance between successive wave crests is defined as _____. - โ โ Wavelength
The effect of the moon on tidal action is about _____. - โ โ Twice the effect of the sun
The four basic plant and animal life zones in the ocean are _____. - โ โ Littoral, Planktonic, Nektonic, Benthic
The gas of choice for technical divers that venture to depths beyond 190 feet (57.9 m) is _____. - โ โ Trimix
The highest tides are called _____ tides, and the lowest tides are called _____ tides. - โ โ spring; neap
The horizontal boundary between waters of differing salinity is defined as a _____. - โ โ Halocline
The onset of nitrogen narcosis is characterized by _____. - โ โ Impairment of thought
The partial pressure of oxygen in air at a depth of 132 feet (40 meters) of sea water is _____. - โ โ 1.05 ata/15.42 psia/1.06 bar
The pressure exerted by any component gas in a mixture is termed the _____ of that gas. - โ โ Partial pressure
The procedure that NAUI advocates for dealing with missing required decompression stops (omitted decompression) is for divers to: - โ โ Remain out of the water, rest, breathe 100% oxygen, drink fluids, be monitored for signs of decompression illness, transported to a hyperbaric facility if symptoms arise.
The recommended maximum rate of ascent for recreational scuba diving is ____ per minute. - โ โ 30 feet (9 meters)
The risk of carbon dioxide buildup while scuba diving can usually be forestalled by _____. - โ โ Avoiding slow or shallow breathing
Maintaining a normal breathing pattern
Being in shape for the exertion demanded by the dive planned
Three signs that a diver is probably on the verge of a panic reaction are _____. - โ โ Low, rapid breathing, choking, and a rapid ascent for the surface
To reverse a lower leg or foot cramp, _____. - โ โ Stretch the muscles and tendons by pulling the tip of the fin toward the knee
Two benefits derived from using an electronic dive computer are _____.
- โ โ Accurate monitoring of ascent rate and, if executing a multi- level diving profile, avoidance of the maximum time/depth penalty
Two cylinder valves in common use today are: - โ โ The K-valve and DIN valve.
Water of equal temperature at all levels is most likely to be found in a lake during the _____. - โ โ Spring
Water rocking back and forth in a lake or a bay is defined as _____. - โ โ Seiching
What are the primary types of decompression sickness (DCS)? - โ โ Musculoskeletal; Central Nervous System
What is the difference in weight between three cubic feet (85 liters) of fresh water and the same volume of sea water? - โ โ 4.8 pounds (2.2 kg)
_____ is a loss of your sense of direction or position. - โ โ Disorientation
_____ is the biggest breath you can exhale. - โ โ Vital capacity
A dive team conducting a night dive should have a total of how many lights (minimum) between them? - โ โ 4
A dive team conducts a dive to 80 feet (24 meters) of sea water for an actual dive time of 32 minutes. What is the minimum time that the same team can stay out during a surface interval and make a repetitive dive to 69 feet (21 meters) of sea water for an actual dive time of 30 minutes without required decompression? - โ โ 3 hours and 21 minutes
A dive team conducts a dive to 95 feet (29 meters) of sea water for an actual dive time of 20 minutes. The team then has a surface interval of 2 hours. The second dive is conducted to a depth of 60 feet (18 meters) for an actual dive time of 30 minutes. The team then has a surface interval of 1 hour and 45 minutes. The team plans to make a third dive to a depth of 40 feet (12 meters). What is the team's adjusted maximum dive time for the third dive? - โ โ 69 minutes
What is the term for a clinical condition that follows suffocation by submersion in liquid after which there are at least 24 hours of survival? - โ โ Near Drowning
What pressure will a scuba cylinder with a rated working pressure of 3000 psig (207 bar), be exposed to during a hydrostatic test? - โ โ 5000 psig (345 bar)
When considering a regulator for purchase or use, an important point to remember is that certain regulators may not be capable of delivering ______ flow rates at ______ cylinder pressure during an air sharing emergency. - โ โ high; low
When waves break on shore and the backrush is funneled through a narrow opening, the condition is known as _____. - โ โ A rip current
When your location is confirmed with visual checkpoints, you are navigating with _____. - โ โ Pilotage
Which of the following is a method for measuring distance underwater?
Which of the following is an example of an injury explained by or attributed to Boyle's Law? - โ โ Equalization of air spaces
Reverse blocks
Lung rupture injuries
Which of the following is considered proper care of a scuba cylinder? - โ โ Preventing moisture from entering the cylinder.
Which of the following occurs when marine organisms concentrate pollutants in their tissues through uptake by filtering, feeding, or passive absorption? - โ โ bioaccumulation
Which of the search patterns listed below requires the use of a compass?
- โ โ The expanding box or square
Which principle represents one basis for the hydrostatic testing of scuba cylinders? - โ โ Permanent expansion
Which regulator second stage design uses air pressure rather than mechanical leverage to open the main valve? - โ โ Pilot
