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NAUI Diver Master Exam (New 2024/ 2025
Update) Questions and Verified Answers|
100% Correct| A Grade
QUESTION
What is the difference in weight between three cubic feet (85 liters) of fresh water and the same volume of sea water? Answer: 4.8 pounds (2.2 kg)
QUESTION
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? Answer: 4 bags
QUESTION
The pressure exerted by any component gas in a mixture is termed the _____ of that gas. Answer: Partial pressure
QUESTION
The air (or other breathing mixture) that a diver breathes at depth is delivered to the diver by the regulator at _____. Answer:
Ambient pressure
QUESTION
Which of the following is an example of an injury explained by or attributed to Boyle's Law? Answer: Equalization of air spaces Reverse blocks Lung rupture injuries
QUESTION
One way that heat loss occurs during diving activity is through _____. Answer: Conduction
QUESTION
Henry's Law states that the amount of gas that will dissolve into a solution is _____ proportional to the partial pressure of that gas and _____ proportional to the absolute temperature. Answer: directly; inversely
QUESTION
The absolute pressure at 75 feet (23 meters) of sea water is: Answer: 3.27 ata/48.07 psia/3.3 bar
QUESTION
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 bar
QUESTION
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 (12 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)? Answer: 132 cubic inches/2.16 liters
QUESTION
As we inhale air, it moves from the nose and the mouth to the _____ into the two _____ and finally to the microscopic _____. Answer: Trachea, bronchi, alveoli
QUESTION
The stimulus to breath results primarily from _____ in the bloodstream. Answer: Carbon dioxide
QUESTION
_____ is the biggest breath you can exhale.
Answer: Vital capacity
QUESTION
The risk of carbon dioxide buildup while scuba diving can usually be forestalled by _____. Answer: Avoiding slow or shallow breathing Maintaining a normal breathing pattern Being in shape for the exertion demanded by the dive planned
QUESTION
Excess breathing resistance can be caused by improperly tuned regulators and small bore snorkels. Answer: True
QUESTION
Loss of consciousness on ascent in shallow water while breathhold diving is known as _____. Answer: Shallow water blackout
QUESTION
Hyperventilation lowers the _____ in your body, the reverse of _____ buildup. _____ signals your body to breathe, and below a certain level of _____ you do not feel the urge to breathe. Answer: CO
Answer: Impairment of thought
QUESTION
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 _____. Answer: Decompression sickness
QUESTION
What are the primary types of decompression sickness (DCS)? Answer: Musculoskeletal; Central Nervous System
QUESTION
To reverse a lower leg or foot cramp, _____. Answer: Stretch the muscles and tendons by pulling the tip of the fin toward the knee
QUESTION
A hood or tight seal can fool your carotid sinus baroreceptors into thinking that there is high blood pressure by pushing on them. Answer: True
QUESTION
Compressing your carotid arteries too much can make you _____. Answer: Dizzy, or even unconscious
QUESTION
Which malady is a result of pulmonary overinflation during ascent? Answer: Arterial gas embolism
QUESTION
Emergency 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, initiate transport to a hospital with a hyperbaric chamber
QUESTION
Physical damage to the body resulting from a direct change in pressure is called _____. Answer: Barotrauma
QUESTION
Clinical Hypothermia occurs when the core temperature of the human body falls below what temperature? Answer:
Answer: Not to dive
QUESTION
Which diving instrument incorporates a Bourdon tube mechanism? Answer: Cylinder pressure gauges
QUESTION
Two benefits derived from using an electronic dive computer are _____. Answer: Accurate monitoring of ascent rate and, if executing a multi-level diving profile, avoidance of the maximum time/depth penalty
QUESTION
Green discoloration on the first stage of a scuba regulator indicates _____. Answer: Water has most likely entered the first stage
QUESTION
An air compressor used for filling scuba cylinders operates by the principle of _____. Answer: Boyle's Law
QUESTION
Dry suits form a waterproof barrier, but require undergarments to be effective in cold water
Answer: True
QUESTION
In order to make an informed decision on equipment purchase, you need to have a solid educational background concerning the _____ of diving equipment: Answer: Types, Method of operation, Care and maintenance
QUESTION
The distance between successive wave crests is defined as _____. Answer: Wavelength
QUESTION
The highest tides are called _____ tides, and the lowest tides are called _____ tides. Answer: spring; neap
QUESTION
Water rocking back and forth in a lake or a bay is defined as _____. Answer: Seiching
Currents in bodies of water are formed by _____. Answer: Surface winds, The rotation of the earth, The influence of the sun and moon
QUESTION
Water of equal temperature at all levels is most likely to be found in a lake during the _____. Answer: Spring
QUESTION
The horizontal boundary between waters of differing salinity is defined as a _____. Answer: Halocline
QUESTION
The four basic plant and animal life zones in the ocean are _____. Answer: Littoral, Planktonic, Nektonic, Benthic
QUESTION
A marine animal whose tissues are toxic, either in part or entirety is _____. Answer: Poisonous
QUESTION
Scyphozoans, or true jellyfish, possess stinging cells within their tentacles called _____. Answer: Nematocysts
QUESTION
Which creature poses a potential threat to divers in the freshwater environment? Answer: Alligator snapping turtle
QUESTION
Which of the following occurs when marine organisms concentrate pollutants in their tissues through uptake by filtering, feeding, or passive absorption? Answer: bioaccumulation
QUESTION
One way that divers can preserve the underwater environment is to: Answer: Practice spearfishing in areas legal to do so and obey local fishing regulations.
QUESTION
Compressed air, the gas that is primarily used by recreational divers, is composed of: Answer: 78.04% nitrogen, 20.94% oxygen, .033% carbon dioxide, and .934% inert gas
Answer: 1.58:
QUESTION
Haldane and his associates used _____ compartments to model the human body. Answer: 5
QUESTION
Prior to 1943, repetitive diving tables were unnecessary because air was surface supplied and workers stayed down until the job was complete. Answer: True
QUESTION
The _____ tables were validated using Doppler measurements of "silent bubbles," and should provide the best margin of safety based on human experiment. Answer: DCIEM
QUESTION
The recommended maximum rate of ascent for recreational scuba diving is ____ per minute. Answer: 30 feet (9 meters)
QUESTION
Special tables and procedures are required when diving at elevations ______ above sea level. Answer: 1000 feet (300 meters)
QUESTION
If a dive is particularly cold and/or strenuous, the dive team should use _____. Answer: The next greater actual dive time to determine your repetitive group letter
QUESTION
The procedure that NAUI advocates for dealing with missing required decompression stops (omitted decompression) is for divers to: Answer: 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.
QUESTION
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? Answer: 25 minutes
QUESTION
QUESTION
If the time between dives is less than 10 minutes, the surface interval is _____. Answer: Ignored
QUESTION
The type of hyperbaric chamber preferred for the treatment of diving injuries is a _____. Answer: Multiplace double-lock chamber rated for service to six atmospheres
QUESTION
Which of the following dependent emergency ascent methods is the preferred one to use? Answer: Some method of alternate air source ascent
QUESTION
Which type of ascent should be used only if a diver believes that he or she is incapable of swimming to the surface? Answer: Emergency Buoyant Ascent
QUESTION
Problems such as a loss of a mask or fin require an emergency ascent. Answer:
False
QUESTION
The safer way to deal with an out-of-air emergency may be _____. Answer: A redundant system ascent
QUESTION
An extra second stage should be mounted in the center of the chest for easy accessibility by _____. Answer: Both the donor and recipient
QUESTION
Three signs that a diver is probably on the verge of a panic reaction are _____. Answer: Low, rapid breathing, choking, and a rapid ascent for the surface
QUESTION
One of the six steps recommended by NAUI in the preparation for a rescue is _____. Answer: Completion of NAUI Scuba Rescue Diver course
QUESTION
Which technique is effective for controlling the ascent of an unconscious diver?
