SDI Certification Review Practice Test.
What does SCUBA stand for? - CORRECT ANSWER Self
Contained
Underwater
Breathing
Apparatus
List the three important scuba diving changes that occurred in the 1950s - CORRECT ANSWER 1) Dive tables published for repetitive dives
2) Improved design/...
SDI Certification Review Practice Test. What does SCUBA stand for? - CORRECT ANSWER Self
Contained Underwater
Breathing Apparatus
List the three important scuba diving changes that occurred in the 1950s - CORRECT 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 - CORRECT ANSWER Depth gauge, dive tables, watch
What sets SDI apart from other training agencies? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT 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. - CORRECT ANSWER Slack If you are caught in a rip current, first swim _____ to the current to get out of it before swimming towards shore. - CORRECT ANSWER Perpendicular
Start your dive by swimming ____ the current - CORRECT ANSWER into/against
Global currents are _____.
Local currents ____. - CORRECT ANSWER Fixed
Fluctuate
Rip current - CORRECT ANSWER Current which goes seaward due to ocean floor stuctures
Long shore current - CORRECT ANSWER Flows parallel to shore
Waves are caused by - CORRECT ANSWER energy generated by WIND
Tides are caused by - CORRECT ANSWER polarity of the moon
T/F: Anticipate surge action to avoid contact with stationary objects. - CORRECT ANSWER True
What is surge - CORRECT 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 - CORRECT 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 - CORRECT ANSWER Defense
How do you treat a sting? - CORRECT ANSWER Hot water or vinegar
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