SDI Scuba Certification Exam Study Guide Questions With Complete Solutions
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Course
SDI
Institution
SDI
SDI Scuba Certification Exam Study Guide Questions With Complete Solutions
Define SCUBA - correct answer...S - self
C - contained
U - underwater
B - breathing
A - apparatus
List 3 important scuba diving changes that occurred in 1950s - correct answer...1) published USN dive tables
2) inv...
SDI Scuba Certification Exam Study
Guide Questions With Complete
Solutions
Define SCUBA - correct answer...✔✔S - self
C - contained
U - underwater
B - breathing
A - apparatus
List 3 important scuba diving changes that occurred in 1950s - correct 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 - correct answer...✔✔1)
dive tables
2) J-valves
3) depth gauges
What sets SDI apart from other training agencies? - correct 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? - correct 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? - correct answer...
✔✔4 times faster because water is about 800 times denser than air.
What is the first color to be absorbed underwater? - correct 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. - correct answer...
✔✔Slack tide
AGRADESOLUTIONS
, If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore. - correct answer...✔✔Parallel
Waves are usually caused by - correct answer...✔✔Wind pushing water on the surface
T or F: Anticipate surge action to avoid contact with stationary objects - correct
answer...✔✔True
What type of marine life cause most diving injuries? - correct 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? - correct 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? - correct answer...✔✔1) tidal
conditions
2) marine life
3) first aid for potential injuries in area
What is the absolute pressure (in atm/bar) at 20 meters (66 feet)? - correct answer...✔
✔3 atm/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? - correct answer...✔✔8 cubic feet/liter (4x the
volume)
How many more times dense is the air in a ballon at 4 atm/bar compared to air density
at surface? - correct answer...✔✔4x
If a scuba cylinder lasts two hours at sea level, how long will it last at 20 m/66 ft? -
correct answer...✔✔40 minutes
120 min x 1/3 (vol) = 40 min
How often should a scuba diver equalize during descent? - correct answer...✔✔At the
surface before descent and every couple of feet
What should you do if you experience discomfort in your ears upon descending? -
correct answer...✔✔Stop, ascend a few feet until you no longer feel discomfort,
equalize again, then continue with descent
What is a reverse block? - correct answer...✔✔When air cannot escape freely from an
air space during ascent
AGRADESOLUTIONS
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