PADI Open Water Diver Final Exam Questions and Answers 100% Solved

As you descend in water, the pressure - ANSWER-increases A depth change of 10 metres/33 feet causes a pressure change of - ANSWER-1 bar/ata (atmosphere) if you take 6 liters of air from the surface to 20 metres/66 feet, the volume will be - ANSWER-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 - ANSWER-burst A squeeze is caused by - ANSWER-a pressure imbalance between the surrounding pressure and an air space Equalization is the process of - ANSWER-adding air to an air space The most important rule in scuba diving is to - ANSWER-breathe continuously and never hold your breath During ascent I feel discomfort in my ears. I should - ANSWER-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 - ANSWER-faster than The most efficient way to breathe dense air underwater is to breathe - ANSWER-deeply and slowly Buoyancy - ANSWER-a force that pushes an object in water upward Salt water causes more buoyancy than fresh water because it is _____ dense and weighs _____ - ANSWER-more When I descend, my buoyancy tends to ________. When I ascend, it tends to _______ - ANSWER-decrease, increase The three most important considerations in choosing scuba equipment are suitability, fit, and - ANSWER-comfort The two basic fin styles are __________ fins - ANSWER-adjustable and full-foot My primary considerations when choosing fins are fit and - ANSWER-blade size BCD (buoyancy control device) - ANSWER-holds your kit together and allows you to adjust buoyancy throughout the dive Regulator - ANSWER-delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into the air Cylinder - ANSWER-holds the high-pressure breathing air supplied by your regulator during the dive Weight System - ANSWER-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 - ANSWER-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 - ANSWER-inflates the BCD with air from my scuba cylinder Burst disk - ANSWER-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 _________ - ANSWER-every 2-5 years, annually The most important feature in my weight system is its - ANSWER-quick release Trim means having the right _____ of weight - ANSWER-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 - ANSWER-true An object that is neutrally bouyant in fresh water will _____ in salt water - ANSWER-float Underwater objects appear - ANSWER-larger and/or closer Sound travels about 4 times _____ in water than in air, making it difficult to determine its source - ANSWER-faster To move efficiently as a diver, I should move - ANSWER-slowly and steadily Trim is important for streamlining because - ANSWER-poor trim raises or lowers my feet, causing drag Overexertion results from - ANSWER-a prolonged increased effort Buddy Predive Safety Check - ANSWER-Begin With Review And Friend BCD, Weight, Releases, Air, Final Check If my buddy and I get separated, the general procedure is to - ANSWER-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 - ANSWER-90 bar/1300 psi My buddy and I have just started our descent. I begin equalizing - ANSWER-immediately, as soon as my head goes underwater During my descent, to control my buoyancy I add air to my BCD - ANSWER-in small amounts, frequently To start my ascent, I should - ANSWER-swim up gently To control my buoyancy while ascending, I should - ANSWER-vent my BCD with in small amounts frequently A safety stop is a stop between ______ and ______ for three to five minutes - ANSWER-6 m/20 ft, 3 m/10 ft