Study guides, Class notes & Summaries

CH 2 : What is the most important rule in scuba diving? never hold your breath CH 4 : Describe from start to finish the steps to disassembling your scuba system - remove accessories and weights - decompress the system : turn the valve knob completely clockwise, decompress the second gauges (purge button or auto inflator button to vent air remaining in the hoses) - detach the LP hose from the inflator assembly by pulling the collar back on the quick disconnect , unscrew the yoke knob u...

SDI Computer Nitrox Questions and Answers 100% Pass True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox. True The air we normally breathe consists primarily of: Nitrogen and Oxygen A mixture of nitrogen and oxygen in which the percentage of oxygen is greater than that found in air is generally called: Enriched Air, Enriched Air Nitrox, Nitrox, Etc. The person who creates the Nitrox used to fill scuba cylinders is referred to as a: Blender Which of the following...

To reach HCI goals, managers and developers need to be knowledgeable about the interplay among: A) users B) tasks C) the environments in which systems are used D) All of the above - Answer-D) All of the above In HCI, well-being means concern for the human's: A) Physical state, such as comfort, safety, and health. B) Physical and psychological state. C) Psychological state, such as system acceptance, technology-stress, and software frustration. D) Physical environment, such ...

SDI OPEN WATER SCUBA DIVER EXAM + Q'S 1. How big do Objects under water appear: Objects appear 33% larger underwa- ter. 2. How far away do objects appear underwater?: Objects appear 25% closer. 3. How much faster does sound travel in water, compared to air?: 4 times 4. How fast does Water conduct heat away from your body: 25 times faster than air does 5. As you descend what happens to colors and which colors?: colors fade, reds and oranges fade first, 30 meters seem blue and gray 6. At ...

1. What does SCUBA stand for? ANS Self Contained Underwater Breathing Apparatus 2. List the three important scuba diving changes that occurred in the 1950s ANS 1) Dive tables published for repetitive dives 2) Improved design/quality of scuba gear 3) Dive computers commercially available 3. Name three different devices that modern dive computers replace ANS Depth gauge, dive tables, watch 4. What sets SDI apart from other training agencies? ANS Students use a personal dive computer for ...

1. True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox. ANS True 2. The air we normally breathe consists primarily of ANS Nitrogen and Oxygen 3. A mixture of nitrogen and oxygen in which the percentage of oxygen is greater than that found in air is generally called ANS Enriched Air, Enriched Air Nitrox, Nitrox, Etc. 4. The person who creates the Nitrox used to fill scuba cylinders is referred to as a ANS Blender 5. Which of the following is not a Nitrox mixtur...

1. Objects under water appear 1: The same size as they do on land. 2: Twice as large as they do on land. 3: Closer and larger than they do on land. 4: Smaller and farther away than they do on land.: Closer and larger than they do on land. 2. As you descend: 1: Colors appear to fade. 2: Reds and oranges are among the first colors to disappear. 3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. 4: All of the above.: All of the above. 3. Which of the followin...

1. Objects under water appear ANS Closer and larger than they do on land 2. How much faster does sound travel in water, compared to air? ANS 4 times 3. Water conducts heat away from your body ANS 25 times faster than air does 4. As you descend ANS colors fade, reds and oranges fade first, 30 meters seem blue and gray 5. water temp does your body need thermal protection ANS 86 degrees 6. What does SCUBA mean ANS self-contained underwater breathing apparatus 7. When water stratifies it...

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 train...

1. Objects under water appear ANS Closer and larger than they do on land 2. What happens to colors under water ANS As you descend, colors appear to fade, not intensify. Blues and grays are the last remaining colors at depth. 3. Because sound travels faster under water ANS Sound's increases speed under water makes it harder to determine the direction from which it is coming. 4. Water conducts heat away from your body times faster than air does ANS 25 5. The presence of thermoclines means...

1. objects underwater appear and than they do on land: closer and larger 2. As you descend: 1: Colors will remain largely the same. 2: Blues and grays disappear quickly. 3: Dive lights have little effect on apparent color. 4: None of the above.: 4 (none of the above) 3. Water conducts heat away from your body x as fast as air does: 25x 4. When water stratifies itself into layers, according to temperature, the bound- ary between layers is known as a(n) ANS thermocline 5. Which of the follo...