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Exam (elaborations)

SDI SCUBA CERTIFICATION EXAM STUDY GUIDE

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SDI SCUBA CERTIFICATION EXAM STUDY GUIDE 1. Define SCUBA: S - self C - contained U - underwater B - breathing A - apparatus 2. 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 imp...

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  • September 26, 2024
  • 28
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • SDI
  • SDI
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NURSEBRUCE
SDI SCUBA CERTIFICATION EXAM STUDY
GUIDE
1. Define SCUBA: S -

self C - contained

U-

underwater

B-

breathing A -

apparatus

2. 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

3. Name 3 different devices that modern dive computers replace

1) dive tables

2) J-valves

1/

, SDI SCUBA CERTIFICATION EXAM STUDY
GUIDE
3) depth gauges

4. 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

5. How much larger and closer do objects appear underwater

and why?: Ob- jects underwater appear 25% larger and 25% closer




As light travels through the airspace created by the mask, it bends,

creating a magnifying effect.

6. How much faster does sound move through water than air and

why?: 4 times faster because water is about 800 times denser than air.

7. What is the first color to be absorbed underwater?: Red (within

first 25 feet)

8. When diving from shore, the best time to dive is when


2/

, SDI SCUBA CERTIFICATION EXAM STUDY
GUIDE
there is the least amount of tidal current. tide is when there

is no horizontal water movement.: Slack tide

9. If you are caught in a rip current, first swim to the

current to get out of it before swimming towards shore.:

Parallel

10.Waves are usually caused by: Wind pushing water on the surface

11. T or F: Anticipate surge action to avoid contact with

stationary objects: -

True

12.What type of marine life cause most diving injuries?: Most

diving injuries result from animal's defensive response to a perceived

threat

13.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.


3/

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