Scuba Diving Final Exam (Padi Open Water Diver) 2024

Scuba Diving Final Exam (Padi Open Water Diver) 2024 What will the buoyancy of an object be (positive, neutral, or negative) if it displaces an amount of water: a. more than its own weight? b. less than its own weight? c. equal to its own weight? - CORRECT ANSWER-a. positive b. negative c. neutral How does the buoyancy of an object differ in fresh water compared to salt water. - CORRECT ANSWER-Because salt water weighs more than fresh water, it causes more buoyancy (more upward force) What is the relationship between increasing and decreasing depth and water pressure? - CORRECT ANSWER-With increasing depth the water pressure increases. With decreasing depth the water pressure decreases. What are the absolute pressures, air volume, and air density in atmospheres, for: a. 10m/33ft b. 20m/66ft b. 30m/99ft c. 40m/132ft - CORRECT ANSWER-a. 2 bar/ata, 1/2, x 2 b. 3 bar/ata, 1/3, x 3 c. 4 bar/ata, 1/4, x4 d. 5 bar/ata, 1/5, x5 What is the relationship between air volume and density, and how do they vary according to this relationship when pressure increases or decreases? - CORRECT ANSWER-Air volume and density change proportionately with pressure. As pressure increases, air volume decreases, and air density increases. As pressure decreases, air volume increases, and air density decreases. What is a "squeeze"? - CORRECT ANSWER-A pressure imbalance that pushes tissues into an air space. What is "equalization"? - CORRECT ANSWER-The process of adding air to an air space. What are the three ways you can equalize air spaces during descent? - CORRECT ANSWER-1. pinch your nose and blow gently against it 2. wiggling your jaw side-to-side and swallowing 3. blow air into mask through your nose How often should you equalize during descent? - CORRECT ANSWER-Frequently What three steps should you take if you feel discomfort in an air space while descending? - CORRECT ANSWER-1. stop your descent 2. signal your buddy(ies) 3. ascend slightly until the discomfort passes and try again What is the most important rule in scuba diving? - CORRECT ANSWER-to breathe continuously and never, ever hold your breath What are the consequences of breaking the most important rule in scuba diving? - CORRECT ANSWER-lung overexpansion injuries How does increasing depth affect how long your air supply lasts? - CORRECT ANSWER-it shortens it What's the most efficient way to breathe dense air underwater? - CORRECT ANSWERtake slow, deep breaths When selecting scuba equipment, what are the three most important factors? - CORRECT ANSWER-suitability, fit, and comfort How do you prepare a new mask for use? - CORRECT ANSWER-you may need to scrub the interior of the glass with a mask cleaner. main preparation is to adjust the strap. fit it over the crown of your head, above your ears, with a snug but not overly tightly fit. secure the strap locking device if it has one. What are two basic types of tank valves? - CORRECT ANSWER-yoke and DIN What's the difference between a DIN valve and a yoke valve? - CORRECT ANSWERthe yoke system holds the first stage to the cylinder with a clamp system. with the DIN system, the regulator threads into the valve. What's the best way to keep water out of a scuba tank? - CORRECT ANSWER-to never completely empty it and store the cylinder in a standing position. Why do you need scuba tank visual inspections and pressure tests and how oft