Scuba Diving Final Exam 2023 with correct answers

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? a. positive b. negative c. neutral How does the buoyancy of an object differ in fresh water compared to salt water. 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? 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 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? 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"? A pressure imbalance that pushes tissues into an air space. What is "equalization"? The process of adding air to an air space. What are the three ways you can equalize air spaces during descent? 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? Frequently What three steps should you take if you feel discomfort in an air space while descending? 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? to breathe continuously and never, ever hold your breath What are the consequences of breaking the most important rule in scuba diving? lung overexpansion injuries How does increasing depth affect how long your air supply lasts? it shortens it