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SDI Scuba Certification Exam Study Guide Questions and Answers | Latest Update 2024/2025 $12.49   Add to cart

Exam (elaborations)

SDI Scuba Certification Exam Study Guide Questions and Answers | Latest Update 2024/2025

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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 ...

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  • September 20, 2024
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1 | P a g e | © copyright 2024/2025 | Grade A+


SDI Scuba Certification Exam Study
Guide Questions and Answers | Latest
Update 2024/2025
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?




Master01 | September, 2024/2025 | Latest update

, 2 | P a g e | © copyright 2024/2025 | Grade A+

✓ ~~> 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.




Master01 | September, 2024/2025 | Latest update

, 3 | P a g e | © copyright 2024/2025 | Grade A+

✓ ~~> 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)?



Master01 | September, 2024/2025 | Latest update

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