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Exam (elaborations)

SDI Certification Exam Review Questions And Answers Latest Updates

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  • SDI Certification
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  • SDI Certification

What should you do if a potentially dangerous animal underwater does not leave your area? - ️️Remain still Remain calm Slowly leave area What types of marine life cause most diving injuries - ️️Jellyfish or marine life which account for a temporary, painful sting. WATCH OUT FOR ALLERGI...

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  • September 20, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • SDI Certification
  • SDI Certification
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ACADEMICMATERIALS
SDI Certification Exam Review
What should you do if a potentially dangerous animal underwater does not leave your
area? - ✔️✔️Remain still
Remain calm
Slowly leave area

What types of marine life cause most diving injuries - ✔️✔️Jellyfish or marine life which
account for a temporary, painful sting. WATCH OUT FOR ALLERGIC REACTIONS.

How much larger and closer do objects appear under water and why? - ✔️✔️33%
larger, 25% closer
Light bends in the air-space between the lens and your eyes

List the three important scuba diving changes that occurred in the 1950s - ✔️✔️1) Dive
tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially available

Name three different devices that modern dive computers replace - ✔️✔️Depth gauge,
dive tables, watch

What sets SDI apart from other training agencies? - ✔️✔️Students use a personal dive
computer for all instruction and certification dives

.

How much faster does sound move through water than air and why? - ✔️✔️4 times
faster in water
Water is 800x denser than air; sound travels through denser mediums at faster rates

What is the first color absorbed underwater? - ✔️✔️RED (followed by OYGBIV)

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

If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore. - ✔️✔️Perpendicular

Start your dive by swimming ____ the current - ✔️✔️into/against

Global currents are _____.
Local currents ____. - ✔️✔️Fixed

, Fluctuate

Rip current - ✔️✔️Current which goes seaward due to ocean floor stuctures

Long shore current - ✔️✔️Flows parallel to shore

Waves are caused by - ✔️✔️energy generated by WIND

Tides are caused by - ✔️✔️polarity of the moon


What does SCUBA stand for? - ✔️✔️Self
Contained
Underwater
Breathing
Apparatus



T/F: Anticipate surge action to avoid contact with stationary objects. - ✔️✔️True

What is surge - ✔️✔️Back and forth motion underwater which you shouldn't fight; move
deeper and away from dangerous objects if caught in one. USE THEM TO YOUR
ADVANTAGE


Injuries due to marine life typically a _____ response - ✔️✔️Defense

How do you treat a sting? - ✔️✔️Hot water or vinegar


List three different reasons that it is advisable to check with your local dive center before
diving in an unfamiliar area. - ✔️✔️1) Rip currents could be prevalent
2) Thermoclines could affect thermal protection
3) YOU ARE SUBJECT TO LOCALITY (be aware of laws and regulations

What is the absolute pressure in atm at 20m/66ft? - ✔️✔️3 atm absolute

What will be the volume in a ball that is filled with 2 cubic feet of air at 30 m/99ft when it
is taken to the surface? - ✔️✔️8 cubic feet

How many times more dense is air in a balloon at 4 atm compared to the air density at
the surface? - ✔️✔️4 times

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