SDI Scuba Certification Exam Study Guide | Actual 2026 /
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Terms in this set (81)
Define SCUBA S - self
C - contained
U - underwater
B - breathing
A - apparatus
List 3 important scuba diving changes that occurred in 1) published USN dive tables
1950s 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 1) dive tables
replace 2) J-valves
3) depth gauges
What sets SDI apart from other training agencies? 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 Objects underwater appear 25% larger and 25% closer
underwater and why?
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 4 times faster because water is about 800 times denser than air.
air and why?
What is the first color to be absorbed underwater? Red (within first 25 feet)
When diving from shore, the best time to dive is when Slack tide
there is the least amount of tidal current. _______ tide is
when there is no horizontal water movement.
If you are caught in a rip current, first swim _____ to the Parallel
current to get out of it before swimming towards shore.
Waves are usually caused by Wind pushing water on the surface
T or F: Anticipate surge action to avoid contact with True
stationary objects
What type of marine life cause most diving injuries? Most diving injuries result from animal's defensive response to a perceived
threat
What should you do if you see a potentially dangerous Remain still and calm. Slowly leave area if necessary.
animal underwater and it does not leave the area?
List three different reasons that it is advisable to check 1) tidal conditions
with your local dive center before conducting a dive in 2) marine life
an area you are unfamiliar with? 3) first aid for potential injuries in area
What is the absolute pressure (in atm/bar) at 20 meters 3 atm/bar
(66 feet)?
What will be the volume in a ball that is filled with 2 8 cubic feet/liter (4x the volume)
cubic feet/liters of air at 30 meters (90 feet) when it is
taken to surface?
How many more times dense is the air in a ballon at 4 4x
atm/bar compared to air density at surface?
If a scuba cylinder lasts two hours at sea level, how 40 minutes
long will it last at 20 m/66 ft?
120 min x 1/3 (vol) = 40 min
2027 Questions with Verified Answers Grade A+ Guarantee
Save
Students also studied
Flashcard sets Study guides
FEMA IS 700.b - An Intro to the NIM... NIMS ICS 400 Final Exam United Airlines final assessment Air
Teacher 124 terms Teacher 18 terms Teacher 41 terms Te
rachaelbundi41 Preview Samuel_Jackson1914 Preview quizlette46715940 Preview
Terms in this set (81)
Define SCUBA S - self
C - contained
U - underwater
B - breathing
A - apparatus
List 3 important scuba diving changes that occurred in 1) published USN dive tables
1950s 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 1) dive tables
replace 2) J-valves
3) depth gauges
What sets SDI apart from other training agencies? 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 Objects underwater appear 25% larger and 25% closer
underwater and why?
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 4 times faster because water is about 800 times denser than air.
air and why?
What is the first color to be absorbed underwater? Red (within first 25 feet)
When diving from shore, the best time to dive is when Slack tide
there is the least amount of tidal current. _______ tide is
when there is no horizontal water movement.
If you are caught in a rip current, first swim _____ to the Parallel
current to get out of it before swimming towards shore.
Waves are usually caused by Wind pushing water on the surface
T or F: Anticipate surge action to avoid contact with True
stationary objects
What type of marine life cause most diving injuries? Most diving injuries result from animal's defensive response to a perceived
threat
What should you do if you see a potentially dangerous Remain still and calm. Slowly leave area if necessary.
animal underwater and it does not leave the area?
List three different reasons that it is advisable to check 1) tidal conditions
with your local dive center before conducting a dive in 2) marine life
an area you are unfamiliar with? 3) first aid for potential injuries in area
What is the absolute pressure (in atm/bar) at 20 meters 3 atm/bar
(66 feet)?
What will be the volume in a ball that is filled with 2 8 cubic feet/liter (4x the volume)
cubic feet/liters of air at 30 meters (90 feet) when it is
taken to surface?
How many more times dense is the air in a ballon at 4 4x
atm/bar compared to air density at surface?
If a scuba cylinder lasts two hours at sea level, how 40 minutes
long will it last at 20 m/66 ft?
120 min x 1/3 (vol) = 40 min
