Scuba Diving International (SDI) Certification Q&A Bundle

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 b...

What is the absolute pressure (in atmospheres/bars, ATM) at 20 meters(66 feet) 2 ATM What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when it's taken to the surface? 8 cubic feet How many more times dense is the air in a balloon at 4 ATM/bar compared to the...

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 ...

Which of the following methods are appropriate for accounting for divers at the end of the dive? 1: Head count. 2: Equipment count. 3: Checking for empty seats on the boat. 4: A 'by name" roll call. A 'by name" roll call. The first step in assisting a tired diver back to the boat or sho...

What is the absolute pressure (in atm) at 66 feet? 2 atm What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when it's taken to the surface? 8 cubic feet How many more times dense is the air in a balloon at 4 atm compared to the air density at the surface? 4 X...

Objects under water appear: both closer and larger than they do on land What happens to colors as you descend? they appear to fade How much faster does sound travel in water, compared to air? four times as fast Water conducts heat away from your body... 25 times faster than air does T/F: A therm...

What are the most common symptoms of decompression sickness? Pain in the joints, numbness, paralysis, loss of balance, muscle weakness, and impaired thinking What is the recommended first aid for decompression sickness? Controlling their temperature and administering pure oxygen, then immediately g...

True True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox. Nitrogen and Oxygen The air we normally breathe consists primarily of: Enriched Air, Enriched Air Nitrox, Nitrox, Etc. A mixture of nitrogen and oxygen in which the percentage of oxygen is greater than that found...