SDI Scuba Certification Exam Study Guide 2024 Questions with 100% Correct Answers | Verified | Latest Update

1. Define SCUBA ANS S - self C - contained U - underwater B - breathing A - apparatus 2. List 3 important scuba diving changes that occurred in 1950s ANS 1) published USN dive tables 2) invented the personal dive computer 3) equipment manufacturers made improvements to the design and workmanship of gear 3. Name 3 different devices that modern dive computers replace ANS 1) dive tables 2) J-valves 3) depth gauges 4. What sets SDI apart from other training agencies? ANS 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 5. How much larger and closer do objects appear underwater and why? ANS Ob- jects 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? ANS 4 times faster because water is about 800 times denser than air