PADI OPEN WATER DIVER FINAL EXAM QUESTIONS WITH CORRECT ANSWERS GRADED TO PASS

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 A safety stop is a stop between ______ and ______ for three to five minutes - 6 m/20 ft, 3 m/10 ft When I reach the surface, the first thing I do is _______ - inflate my BCD Wet suit - most common exposure suits; provide insulation and protection; made with neoprene; doesn't keep you dry Dry suit - provide the most insulation; keeps you dry with special watertight zippers and seals; most effective option for cooler water diving Skin suit - aka body suits; provide little or no insulation; worn in warmer water for protection from minor cuts, scrapes, stings, and sunburn Which type of exposure suit requires special training? - dry suit Which type of exposure suit requires a snug fit, without which water would carry away heat or it would be uncomfortable? - wet suit A hood is important when diving in water cooler than approximately - 21 degrees Celsius/ 70 degrees Fahrenheit Which cutting tool is a bladed hook for cutting fishing line or net? - z-knife What are three primary instruments I would normally have while diving? - SPG, dive computer, compass Conditions that affect me while diving include - temperature, water movement, sunlight, aquatic life, and bottom composition In most environments, as I go deeper the water gets - colder Particles made of fine material affect visibility by - remaining suspended for long periods The two types of water motion that affect me as a diver are - waves and current If I were caught in a current and carried downstream past my planned exit, I should swim _______ the current - across The most common injury divers suffer may be - sunburn "Diving within my limits" simply means diving within the limits of my - training, experience, and comfort The type of interaction I should generally have with aquatic life is - passive Potentially hazardous aquatic animals are, broadly, those that _____ and those that ______ - sting/puncture, bite While underwater near a kelp forest, my buddy and I see a large shark approach. We should - remain calm, near the bottom, and watch it One potential hazard of some plants and kelp is - entanglement ______ and ______ generally determine the best way to wade in and out or how soon I put my fins on - bottom composition, aquatic life My buddy and I experience mild surge after entering the water. We may be able to adjust for this by diving - deeper Tides affect conditions related to diving including - currents, depth, and visibility