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SDI Scuba Certification Exam Study Guide Questions & Answers.
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SDI Scuba Certification Exam Study Guide Questions & Answers.SDI Scuba Certification Exam Study Guide Questions & Answers.
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SDI Scuba Certification Exam Study Guide Questions& Answers.
Define SCUBA - answer S - self
C - Contained
U - Underwater
B - Breathing
A - Apparatus
List 3 important scuba diving changes that occurred in 1950s - answer 1) published
USN dive tables
2) Invented the personal dive computer
3) Equipment manufacturers made improvements to the design and workmanship of
gear
Name 3 different devices that modern dive computers replace - answer 1) dive tables
2) J-valves
3) Depth gauges
What sets SDI apart from other training agencies? - answer First dive training agency to
provide entry level scuba instruction that incorporates the use of personal dive
computers --> more streamlined scuba course w/ more instruction time in the water
How much larger and closer do objects appear underwater and why? - Answer Objects
underwater appear 25% larger and 25% closer
As light travels through the airspace created by the mask, it bends, creating a
magnifying effect.
How much faster does sound move through water than air and why? - answer 4 times
faster because water is about 800 times denser than air.
What is the first color to be absorbed underwater? - answer Red (within first 25 feet)
When diving from shore, the best time to dive is when there is the least amount of tidal
current. _______ Tide is when there is no horizontal water movement. - answer Slack
tide
If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore. - answer Parallel
Waves are usually caused by - answer Wind pushing water on the surface
T or F: Anticipate surge action to avoid contact with stationary objects - answer True
, What type of marine life cause most diving injuries? - answer most diving injuries result
from animal's defensive response to a perceived threat
What should you do if you see a potentially dangerous animal underwater and it does
not leave the area? - answer Remain still and calm. Slowly leave area if necessary.
List three different reasons that it is advisable to check with your local dive center before
conducting a dive in an area you are unfamiliar with? - Answer 1) tidal conditions
2) Marine life
3) First aid for potential injuries in area
What is the absolute pressure (in at/bar) at 20 meters (66 feet)? - answer 3 at/bar
What will be the volume in a ball that is filled with 2 cubic feet/liters of air at 30 meters
(90 feet) when it is taken to surface? - answer 8 cubic feet/liter (4x the volume)
How many more times dense is the air in a balloon at 4 at/bar compared to air density at
surface? - answer 4x
If a scuba cylinder lasts two hours at sea level, how long will it last at 20 m/66 ft.? -
answer 40 minutes
120 min x 1/3 (vole) = 40 min
How often should a scuba diver equalize during descent? - answer at the surface before
descent and every couple of feet
What should you do if you experience discomfort in your ears upon descending? -
answer Stop, ascend a few feet until you no longer feel discomfort, equalize again, then
continue with descent
What is a reverse block? - answer when air cannot escape freely from an air space
during ascent
Causes pain and discomfort in the ears and sinuses
What should you do if you experience a reverse block upon ascending? - answer Stop,
descend a few feet until pain subsides, and wait to allow air to vent, then continue with
ascent
What is the most important rule in scuba diving? - answer Breathe continuously and
never hold your breath
What is the most serious injury that a diver could suffer from if they hold their breath
upon ascending? - answer Lung over-expansion
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