PADI Open Water Diver Final 2024 Exam |Questions and Verified Answers | 100% Correct| Grade A (Latest Update) As a newly certified PADI Open Water Diver, I will be trained to dive with buddy as deep as 18 metres/60 feet As you descend in water, the pressure increases A depth change of 10 metres/33 feet causes a pressure change of 1 bar/ata (atmosphere) if you take 6 liters of air from the surface to 20 metres/66 feet, the volume will be 2 litres (the density of the air would be three times the density at the surface) A balloon fully inflated and sealed at 10 metres/33 feet, would probably ______ during ascent to the surface burst A squeeze is caused by a pressure imbalance between the surrounding pressure and an air space Equalization is the process of adding air to an air space The most important rule in scuba diving is to breathe continuously and never hold your breath During ascent I feel discomfort in my ears. I should stop, descend slightly, and allow trapped air to work its way out My buddy and I descend to 12 metres/40 feet. I would expect to use my air _____ at 6 metres/20 feet faster than The most efficient way to breathe dense air underwater is to breathe deeply and slowly Buoyancy a force that pushes an object in water upward Salt water causes more buoyancy than fresh water because it is _____ dense and weighs _____ more When I descend, my buoyancy tends to ________. When I ascend, it tends to _______ decrease, increase The three most important considerations in choosing scuba equipment are suitability, fit, and comfort The two basic fin styles are __________ fins adjustable and full-foot My primary considerations when choosing fins are fit and blade size BCD (buoyancy control device) holds your kit together and allows you to adjust buoyancy throughout the dive Regulator delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into the air Cylinder holds the high-pressure breathing air supplied by your regulator during the dive Weight System holds lead weight to counteract the positive buoyancy of your body and some of your equipment, with a mechanism for dropping some or all the weight in an emergency The five components that make up a BCD include an inflatable bladder, a cylinder band and harness/jacket, an LPI (low-pressure inflator) mechanism, an overpressure/quick exhaust valves, and a weight system LPI mechanism inflates the BCD with air from my scuba cylinder Burst disk a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail scuba cylinders require pressure testing _______ and visual inspection _________ every 2-5 years, annually The most important feature in my weight system is its quick release Trim means having the right _____ of weight distribution Failure to follow the most important rule in scuba diving can cause serious lung overexpansion injuries, which in turn can cause paralysis and death true An object that is neutrally bouyant in fresh water will _____ in salt water float Underwater objects appear larger and/or closer Sound travels about 4 times _____ in water than in air, making it difficult to determine its source faster To move efficiently as a diver, I should move slowly and steadily Trim is important for streamlining because poor trim raises or lowers my feet, causing drag Overexertion results from a prolonged increased effort Buddy Predive Safety Check Begin With Review And Friend BCD, Weight, Releases, Air, Final Check If my buddy and I get separated, the general procedure is to look for each other for no more than a minute, then reunite on the surface My buddy and I are planning a boat dive with the same type cylinders filled to 200 bar/3000 psi. Due to conditions, we are planning very conservatively. We agree on 60 bar/800 psi for our reserve. We agree that we also want an additional 30 bar/500 psi for our ascent and safety stop. This means we should begin our ascent when either of our SPGs reads 90 bar/1300 psi My buddy and I have just started our descent. I begin equalizing immediately, as soon as my head goes underwater During my descent, to control my buoyancy I add air to my BCD in small amounts, frequently To start my ascent, I should swim up gently To control my buoyancy while ascending, I should vent my BCD with in small amounts frequently