SDI Scuba Certification Exam Study Guide Questions With Verified Answers
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Course
SDI
Institution
SDI
SDI Scuba Certification Exam Study Guide
Questions With Verified Answers
Define SCUBA - answerS - self
C - contained
U - underwater
B - breathing
A - apparatus
List 3 important scuba diving changes that occurred in 1950s - answer1) published USN dive
tables
2) invented the personal dive co...
SDI Scuba Certification Exam Study Guide
Questions With Verified 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 atm/bar) at 20 meters (66 feet)? - 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? - 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? - 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 (vol) = 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
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