SDI Scuba Certification Exam Study Guide Questions And Answers Latest Updates
10 views 0 purchase
Course
SDI Scuba Certification
Institution
SDI Scuba Certification
What type of marine life cause most diving injuries? - ️️Most diving injuries result
from animal's defensive response to a perceived threat
How much larger and closer do objects appear underwater and why? - ️️Objects
underwater appear 25% larger and 25% closer
What sets SDI apart from o...
SDI Scuba Certification Exam Study
Guide
What type of marine life cause most diving injuries? - ✔️✔️Most diving injuries result
from animal's defensive response to a perceived threat
How much larger and closer do objects appear underwater and why? - ✔️✔️Objects
underwater appear 25% larger and 25% closer
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
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
water
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 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.
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? -
✔️✔️40 minutes
120 min x 1/3 (vol) = 40 min
How often should a scuba diver equalize during descent? - ✔️✔️At the surface before
descent and every couple of feet
What should you do if you experience discomfort in your ears upon descending? -
✔️✔️Stop, ascend a few feet until you no longer feel discomfort, equalize again, then
continue with descent
What is a reverse block? - ✔️✔️When air cannot escape freely from an air space
during ascent
causes pain and discomfort in the ears and sinuses
What should you do if you experience a reverse block upon ascending? - ✔️✔️Stop,
descend a few feet until pain subsides, wait to allow air to vent, then continue with
ascent
What is the most important rule in scuba diving? - ✔️✔️Breathe continuously and never
hold your breath
What is the most serious injury that a diver could suffer from if they hold their breath
upon ascending? - ✔️✔️Lung over-expansion
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ACADEMICMATERIALS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for $7.99. You're not tied to anything after your purchase.
