SDI Scuba Certification Exam Study Guide Questions and Correct Answers the Latest Update and Recommended Version
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Course
SDI
Institution
SDI
Define SCUBA
→ S - self
→ C - contained
→ U - underwater
→ B - breathing
→ A - apparatus
List 3 important scuba diving changes that occurred in 1950s
→ 1) published USN dive tables
→ 2) invented the personal dive computer
→ 3) equipment manufacturers made improvements to t...
SDI Scuba Certification Exam Study
Guide Questions and Correct Answers the
Latest Update and Recommended
Version
Define SCUBA
→ S - self
→ C - contained
→ U - underwater
→ B - breathing
→ A - apparatus
List 3 important scuba diving changes that occurred in 1950s
→ 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
→ 1) dive tables
→ 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 underwater and why?
→ 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?
→ 4 times faster because water is about 800 times denser than air.
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 there is the least amount of tidal
current. _______ tide is when there is no horizontal water movement.
→ Slack tide
If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore.
→ Parallel
Waves are usually caused by
→ Wind pushing water on the surface
T or F: Anticipate surge action to avoid contact with stationary objects
→ True
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 animal underwater and it does not
leave the area?
→ 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?
→ 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)?
→ 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?
→ 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?
→ 4x
If a scuba cylinder lasts two hours at sea level, how long will it last at 20 m/66 ft?
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