Terms in this set (73)
Which of the statements concerning sound transmission under water is correct?
all are correct.
travels faster in air
One atmosphere of pressure is defined as:
all are correct.
each 34 feet of depth in freshwater
Each 33 feet of depth in sea water
The absolute pressure expressed in terms of atmosphere absolute at 33 feet in sea water is:
should never be worn
if a flexible air-filled container has a volume of 40cu ft on the surface, what would the volume be at 99 feet in water? (rounded off)
10 cu ft
Body heat is lost underwater___ than in air
25-30 times faster
first symptom of a sinus squeeze is usually
sharp pain and wedging above the eyes
Gauge pressure is defined as:
Absolute pressure minus 1 ata
Ear squeeze can be prevented by:
-Never diving with a cold
-rotating the jaw, swallowing or valsalva
The greatest relative pressure change in sea water takes place between ____ and ____ feet.
Absolute pressure is defined as:
The total pressure exerted on an object.
Proper equalization techniques must be learned in order to:
Salt water weighs____ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot.
The purpose of equalization is to:
Introduce additional air into body air spaces in response to increasing external pressure.
Describing diving with the acronym SCUBA came from what event
The development of demand regulators in 1943.
The SSI equipment Service Program is designed to:
Keep all the components of the Total Diving System to optimal performance.
The information System components are:
Dive computer, Analogue instruments, if the dive computer does not supply all necessary information and SSI total divelog.
A scuba tank for recreational diving should be filled with:
pure, filtered compressed air or nitrox.
The three primary features to look for in a quality Exposure system are:
Thickness, fit, and seam integrity.
Assuming a consistent air consumption rate, diving at a pressure of 4ata will use __ as much as air as diving at 2ata
A high pressure scuba cylinder should be stored:
Secured and with a minimum of 500 to 750 psi
Under the SSi Equipment Service Program, your delivery system should be serviced and performance checked:
A scuba cylinder must be hydrostatically tested:
within fixed intervals set by local laws
The delivery system components are:
A regulator, alternate air source, and a high pressure scuba cylinder
The purpose of a BC is to:
all answers are correct
Which of the following total diving systems subsystems best describe the scuba unit?
The delivery system
The three basic rules of scuba stated in the proper order of importance are:
breathe continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training.
Buoyancy system components
Buoyancy compensator, inflation device, and weight belt or BC weight pockets
An object immersed in water will be buoyed upward by a force ____ the weight of the water it displaces.
One of the primary factors contributing to heat loss for divers is:
Haldane's theory that the human body can withstand a 2:1 pressure difference was revised by D workman to a nitrogen ratio of:
1.58 : 1
the best prevention for decompression sickness is to:
plan your dive and dive your plan
The term gradient can be described as:
The difference between the internal partial pressure and the external partial pressure of a gas.
Which of the following over expansion injuries can be characterized by chest pain, breathing difficulties, weakness, and cyanosis(blueness) of the lips and nail beds.
Mediastinal Emphysema and pneumothorax
The transfer of oxygen and nitrogen into the bloodstream occurs through the walls of the:
overexpansion injuries can be prevented by:
all are correct
Which of the following over expansion injuries can be characterized by swelling in the neck area with a crackling sensation upon touching the swollen area?
Dalton's law can be paraphrased as:
The total pressure of a mixture of gases equals the sum of the partial pressures.
The rate at which the body becomes saturated with nitrogen:
Will vary based on factors such as depth and blood supply to a particular area of the body.
Which of the following would be inappropriate treatment for a diver exhibiting symptoms of decompression sickness?
taking the victim back underwater
decompression sickness occurs when:
Most serious lung over expansion injury is:
Arterial Gas Embolism
If a flexible air-filled container at 100 feet of sea water has a volume of 10cu ft, what would be the volume if it were transported to the surface
Diving at altitude or flying after diving
refrain 24 hours after diving
In air at 1 at a, the partial pressure of nitrogen is ____, oxygen is _____.
Treatment for Arterial Gas Embolism
stabilize victim in nearest medical facility and transport to decompression chamber for recompression.
The major, and most common, symptom of decompression sickness is:
Use of the SSI Total DiveLog is important because:
The reciprocal azimuth for an initial azimuth of 60degrees is:
preform safety stops
at 15 feet for 3-5 mins
The term no-decompression limit is defined as:
The maximum allowed time at depth without having to perform a mandatory decompression stop during the ascent
Residual nitrogen is defined as:
The amount of excessive nitrogen dissolved in our blood stream and tissues after a dive
A dive computer keeps track of a diver's nitrogen absorption levels so that the diver can:
stay within the no-decompression limits on each dive.
Rip currents are formed by:
Water breaks over sand bars and reefs near the beach and recedes through channels or cuts in the bars and reefs
The term surface interval is defined as:
The amount of time the diver stays out of the water or on the surface between dives.
To use a compass to navigate to a sighted object:
Point the compass toward the object, rotate the bezel until the witness marks are over the magnetic needle, and follow the lubber line.
When entering the water through the surf, dive buddy teams should:
Maintain physical contact and time entry to coincide with the lull between wave sets.
More than ____ of earth's oxygen is produced by marine plants.
The ocean is an important source of life because:
It is home to many of the first links in earth's food chain
Two examples of hard corals are:
Elkhorn and staghorn
Divers should avoid contact with all corals because:
Water comprises about___ of Earth's surface.
When diving in Marine Protected Areas like Marine Parks, divers should:
Respect and follow the local Marine park regulations
The most common injuries occur when:
An animal is surprised by a diver's actions and instinctively protects itself
Examples of freshwater marine life include:
eels, crayfish, bass
Coral reefs are formed by:
coral animals called polyps that form skeletal structures.
certified SSI Advanced Open Water diver.
complete the SSI Stress and rescue specialty course.
and log a total of 50 dives
The first ting you should do if you observe signs of panic in a diver underwater is:
locate your alternate air source in case it is needed
never endanger yourself
An independent action to take in response to an out of air emergency is:
a controlled swimming accent or emergency buoyancy ascent
complete any 2 speciality courses and log total of 12 dives
Signs of a panicked diver are:
wide-eyed, fearful look and a fast and erratic breathing pattern
4 specialty courses and log a total of 24 dives