SDI Scuba Certification Exam Study Guide With Correct Answers | 100% Verified

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 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 How much larger and closer do objects appear underwater and why? - Objects underwater appear 25% larger and 25% closer 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 type of marine life cause most diving injuries? - Most diving injuries result from animal's defensive response to a perceived threat 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. List three different reasons that it is advisable to check with your local dive center before conducting a dive in an area you are unfamiliar with? - 1) tidal conditions 2) marine life 3) first aid for potential injuries in area