PADI Open Water Diver Final Exam 115 Questions and Answers, Exams of Biology

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PADI Open Water Diver Final Exam 115 Questions and Answers 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 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 While entering through mild turf, as a wave approaches, I should stand - ✔ sideways to it By accident, I find myself in a strong current rushing rapidly away from shore. Generally, I should inflate my BCD and swim - ✔ parallel to shore Before diving, I should refrain using _____ and ______ - ✔ alcohol, tobacco As a new PADI Open Water Diver, I should refresh my dive skills with a PADI ReActivate after _____ of inactivity - ✔ six months For practical purposes, air consists of oxygen (about 21%) and - ✔ nitrogen (about 79%) The two primary factors that influence how much nitrogen dissolves into my body tissues during a dive are _____ and _____ - ✔ depth, time If I exceed established depth and time limits while diving and then surface, bubbles can form in my body tissues, causing ______ - ✔ decompression sickness ______ track the amount of theoretical nitrogen in my body by measuring the depth and time throughout the dive - ✔ dive computers A no stop dive means I can, if necessary, ascend directly to the surface without stopping _____ the dive - ✔ at any time during Repetitive dive - ✔ a dive made while I still have theoretical residual nitrogen in my body Dive tables like the RDP and eRDPml use ____ tables to calculate repetitive dives - ✔ three Advantages of a dive computer over dive tables include dive computers - ✔ are easier to use than tables, help offset human error, and give me more time underwater Before, during, and/or between dives, my computer will tell me - ✔ no stop limits, the ascent rate, emergency decompression information, and previous dive information The first step in setting up my dive computer is - ✔ read the manufacturer instructions I would find a minimum surface interval when, after a dive, I want to know how long the _____ would be - ✔ time at the surface One way to find a _______ with a computer is to periodically check the no stop times for the depth you want, between dives - ✔ minimum surface interval Going to altitude after diving may be a problem because the - ✔ lower pressure can increase DCS risk My buddy and I have made two no stop dives for the last two days. Based on current recommendations, we should wait at least _____ after our last dive before flying - ✔ 18 hours When diving at an altitude of _____ or higher, I need to use altitude diving procedures - ✔ 300 metres/1000 feet Cold and/or strenuous dives may be a problem with respect to DCS because - ✔ I may end the dives with more dissolved nitrogen than calculated by dive computers or tables Using the RDP Table or eRDPml, I should calculate a dive as - ✔ 4 metres/10 feet deeper than the actual depth If I go over a no stop limit, I - ✔ will have to make one or more emergency decompression stops The term "decompression illness" - ✔ includes both lung overexpansion and DCS Treatment for most cases of DCI requires - ✔ recompression in a chamber Gas narcosis - ✔ Thought to be caused by the increased amount of dissolved gases in body tissues slowing nerve impulses that travel in the brain and nervous system Most divers usually begin to notice gas narcosis at a depth of approximately - ✔ 30 metres/100 feet The ______ is always my direction of travel when navigating with a compass - ✔ lubber line I should hold my line so the _______ is aligned with the centerline of my body - ✔ lubber line As I swim while navigating with a compass, I should keep the _____ within the index marks - ✔ north needle I've just finished a single no stop dive with my buddy. We have not been diving in the past several days, and this is the only dive we make. Based on current recommendations, the minimum surface interval before we fly is - ✔ 12 hours