Under Pressure
The condition in which certain colors are diminished as depth increases is called:
A. Turbidity
B. Absorption
C. Refraction
D. Diffusion
B. Absorption
The term Surface Interval is defined as:
A. The amount of time spent on the surface of the water between dives (excludes time out of the water)
B. The amount of time the diver stays out of the water or on the surface between dives
C. Travel time to and from the dive site
D. The amount of nitrogen expelled while on the surface
B. The amount of time the diver stays out of the water or on the surface between dives
A scuba tank for recreational diving should be filled with:
A. Pure, filtered compressed air or Nitrox
B. A mixture of helium and oxygen
C. A mixture of hydrogen and oxygen
D. Pure oxygen
A. Pure, filtered compressed air or Nitrox
Sinus squeeze can be prevented by:
A. Tilting the divers head back and forth
B. Not diving with a cold
C. The Valsalva technique
D. Wearing earplugs
B. Not diving with a cold
Divers should avoid contact with all corals because:
A. Contact can damage the coral
B. All answers are correct
C. Contact can be harmful to the diver
D. Touching corals can damage your equipment
B. All answers are correct
The greatest relative pressure change in sea water takes place between ____ and ____ feet.
A. 33/66
B. 66/99
C. 99/132
D. 0/33
D. 0/33
Diving at altitude or flying after diving:
A. Does not require any special considerations for the diver
B. Allows the diver to spend a greater amount of time at depth without exceeding the nodecompression limits
C. Allows the diver to ignore the nodecompression limits
D. Requires special diving computer functions, altitude tables and/or refraining from flying for at least 24 hours after the completion of a dive
D. Requires special diving computer functions, altitude tables and/or refraining from flying for at least 24 hours after the completion of a dive
The purpose of a BC is to:
A. Control ascent and descent rates
B. All answers are correct
C. Provide surface floatation
D. Maintain neutral buoyancy during the dive
B. All answers are correct
The most important rule when assisting a panicked diver is:
A. Do whatever it takes to help the diver survive
B. Always maintain positive buoyancy
C. Never needlessly endanger yourself
D. Always talk in a calm voice
C. Never needlessly endanger yourself
Water comprises about ___ of the Earth’s surface.
A. 50%
B. 72%
C. 85%
D. 66%
B. 72%
Absolute pressure is defined as:
A. The pressure at the surface plus 1 ata
B. The total pressure exerted on an object
C. The weight of the water that surrounds a diver
D. All answers are correct
B. The total pressure exerted on an object
During normal diving activities, divers should never exceed an ascent rate of __ feet per minute.
A. 20
B. 30
C. 9
D. 18
B. 30
The Buoyancy Control System components are:
A. Buoyancy compensator, exposure suit, and inflation device
B. Buoyancy compensator, inflation device, and weight belt or BC weight pockets
C. Regulator, inflation device, and weight belt or BC weight pockets
D. Buoyancy compensator and inflation device
B. Buoyancy compensator, inflation device, and weight belt or BC weight pockets
If you experience pain in your ears during descent:
A. Continue the descent while gently exhaling into the mask
B. Abort the dive
C. Place a finger in the ear canal and gently massage the ear until the pain ceases
D. Stop the descent and ascend until the pain stops
D. Stop the descent and ascend until the pain stops
The three Basic Rules of Scuba stated in the proper order of importance are:
A. Breathe continuously, Use compressed air only, and the 3-R Rule
B. Maintain neutral buoyancy, breathe continuously, and ascend slowly
C. Regain control, respond, and react
D. Breathe continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training
D. Breathe continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training
Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot.
A. 54/50
B. 64/62.5
C. 65/68
D. They both weigh the same
B. 64/62.5
The term No-decompression Limit is defined as:
A. The bottom time recorded during a dive
B. The maximum depth recorded during the dive
C. The maximum allowed time at depth without having to perform a mandatory decompression stop during the ascent
D. The maximum surface interval allowed during a day’s diving
C. The maximum allowed time at depth without having to perform a mandatory decompression stop during the ascent
Under the SSI Equipment Service Program, your Delivery System should be serviced and performance checked:
A. Every five years
B. Every year
C. Every three years
D. Every month
B. Every year
Which of the following would be inappropriate treatment for a diver exhibiting symptoms of Decompression Sickness?
A. Taking the victim back underwater
B. Administering CPR
C. Administering pure oxygen (if qualified)
D. Treat for shock
A. Taking the victim back underwater
If you lose contact with your buddy, you should:
A. Surface immediately
B. Exit the water at a predetermined location
C. Continue in the direction you were swimming for one minute and then surface
D. Search for no more than a minute by turning 360 degrees and looking up and down and then perform a normal ascent to the surface
D. Search for no more than a minute by turning 360 degrees and looking up and down and then perform a normal ascent to the surface
In air at 1 ata, the partial pressure of nitrogen is___, oxygen is_____.
A. 0.79/0.21 ata
B. 0.21/0.79 ata
C. 1.5/0.8 ata
D. 0.8/0.4 ata
A. 0.79/0.21 ata
Residual nitrogen is dened as:
A. The amount of excessive nitrogen dissolved in our blood stream and tissues after a dive
B. The amount of excessive nitrogen dissolved in our blood stream and tissues at the beginning of the initial ascent to the surface
C. 80% of the gas we breathe
D. The amount of nitrogen dissolved in our blood stream and tissues at the beginning of the .rst dive of the day
A. 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:
A. Stay within the nodecompression limits on each dive
B. Make decompression dives
C. Avoid an Arterial Gas Embolism
D. Dive deeper than 100 feet
A. Stay within the nodecompression limits on each dive
The most serious lung overexpansion injury is:
A. Pneumothorax
B. Subcutaneous emphysema
C. Mediastinal emphysema
D. Arterial Gas Embolism
D. Arterial Gas Embolism
Coral reefs are formed by:
A. Limestone deposits that build up over millions of years
B. Coral animals called polyps that form skeletal structures
C. A group of animals known as the echinoderms
D. Christmas tree tubeworms that form a limestone base for coral to grow
B. Coral animals called polyps that form skeletal structures