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SDI Certification Exam 2024_2025 fully solved & updated.
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SDI Certification Exam 2024_2025 fully solved & updated.
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SDI Certification Exam 2024/2025 fullysolved & updated
What does SCUBA stand for? - ANSWER-Self
Contained
Underwater
Breathing
Apparatus
List the three important scuba diving changes that occurred in the 1950s -
ANSWER-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 - ANSWER-
Depth gauge, dive tables, watch
What sets SDI apart from other training agencies? - ANSWER-Students use a
personal dive computer for all instruction and certification dives
How much larger and closer do objects appear under water and why? - ANSWER-
33% larger, 25% closer
Light bends in the air-space between the lens and your eyes.
How much faster does sound move through water than air and why? - ANSWER-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? - ANSWER-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. -
ANSWER-Slack
If you are caught in a rip current, first swim _____ to the current to get out of it
before swimming towards shore. - ANSWER-Perpendicular
Start your dive by swimming ____ the current - ANSWER-into/against
Global currents are _____.
Local currents ____. - ANSWER-Fixed
Fluctuate
Rip current - ANSWER-Current which goes seaward due to ocean floor stuctures
Long shore current - ANSWER-Flows parallel to shore
Waves are caused by - ANSWER-energy generated by WIND
Tides are caused by - ANSWER-polarity of the moon
T/F: Anticipate surge action to avoid contact with stationary objects. - ANSWER-
True
What is surge - ANSWER-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
What types of marine life cause most diving injuries - ANSWER-Jellyfish or
marine life which account for a temporary, painful sting. WATCH OUT FOR
ALLERGIC REACTIONS.
Injuries due to marine life typically a _____ response - ANSWER-Defense
How do you treat a sting? - ANSWER-Hot water or vinegar
What should you do if a potentially dangerous animal underwater does not leave
your area? - ANSWER-Remain still
Remain calm
Slowly leave area
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