PADI OPEN WATER - BEING A DIVER I QUESTIONS WITH CORRECT ANSWERS GRADED TO PASS

b. 18 metres/60 feet - As a newly certified PADI Open Water Diver, I will be trained to dive with a buddy as deep as __________. a. 10 metres/30 feet b. 18 metres/60 feet c. 30 metres/100 feet d. 40 metres/130 feet a. true - Certain medical conditions can be hazardous while diving, so it is important to answer all questions on the Medical Statement honestly and completely. a. true b. false a. meet specific performance requirements - PADI courses are performance-based. This means that to be certified, I must... a. meet specific performance requirements b. spend a given number of hours in training c. simply pay for the course a. true - Failure to complete assigned independent study can create significant delays, and my instructor may have to cancel and reschedule sessions until I complete the assignment. a. true b. false a. true - When diving in a new dive environment, two benefits of seeking an orientation, supervision, and/or additional training are that it helps me avoid problems and that it helps me enjoy the dive more. a. true b. false There is a pressure change of 1 bar/ata for every 10 metres/33 feet of depth change. - What is the pressure change for each 10 metres/33 feet of depth change? As pressure increases, gas volume decreases and gas density increases. - What is the relationship between pressure and the volume and density of air? weight - Right now, you are under pressure exerted by the air in the atmosphere that surrounds you. This is actually the __________ of the air. weight - Underwater, you're under more pressure because water also has __________, which combines with the atmosphere's pressure. one bar (metric) or one atmosphere (imperial — abbreviated ata) - At sea level the pressure is fairly uniform, and is expressed as... As depth in water increases, pressure increases. As depth in water decreases, pressure decreases. - What is the relationship between my depth in water and the pressure? 10 metres/33 feet - Because water is much denser and heavier than air, __________ feet exerts the same pressure as the whole atmosphere. Pressure increases by one bar/ata for each 10 metres/33 feet you descend (go down). - How does pressure increase underwater? Pressure decreases one bar/ata for every 10 metres/33 feet you ascend (come up). - How does pressure decrease underwater? 1 bar/ata - At 0 metres/feet (sea level), what is the total pressure? 2 bar/ata — one of air plus one of water - At 10 metres/33 feet, what is the total pressure? 3 bar/ata — one of air plus two of water - At 20 metres/66 feet, what is the total pressure? 4 bar/ata - At 30 metres/99 feet, what is the total pressure? A gas volume decreases because the gas molecules get compressed. Gas density increases because all the molecules are there, but they're packed into a smaller area. - Pressure changes affect the volume and density of air (or any other gas). As the pressure increases — as you go deeper — why does a gas volume decrease? Why does gas density increase? Your air volume decreases by 1/2, and your air density will be doubled. - If you go from the surface to 10 metres/33 feet, what happens to your air volume and air density? Your air volume decreases by 1/3 the surface volume, and your air density will be 3 times the surface density. - If you go from 10 metres/33 feet to 20 metres/66 feet, what happens to your air volume and air density? Your air volume decreases by 1/4 the surface volume, and your air density will be 4 times the surface density. - If you go from 20 metres/66 feet to 30 metres/99 feet, what happens to your air volume and air density? Your air volume decreases by 1/5 the surface volume, and your air density increases by 5 times the surface density. - If you go from 30 metres/99 feet to 40 metres/132 feet, what happens to your air volume and air density? The balloon expands, growing larger until it stretches past its failure point and bursts. To prevent this, you'd leave the balloon unsealed and vent some of the expanding air as you ascend. - Suppose you fill a balloon completely and seal it at 10 metres/33 feet. What happens as you ascend? How would you prevent this? a. increases - As you descend in water the pressure... a. increases b. decreases c. does not change a. 1 bar/ata - A depth change of 10 metres/33 feet causes a pressure change of... a. 1 bar/ata b. 2 bar/ata c. 3 bar/ata d. 4 bar/ata b. 2 - If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be __________ litres. a. 1 b. 2 c. 3 d. 4 c. three times - The density of air in the previous question would be __________ the density at the surface. a. one-third b. one-half c. three times d. four times b. burst - A balloon fully inflated and sealed at 10 metres/33 feet, would probably __________ during ascent to the surface. a. shrink (become smaller) b. burst ears, sinuses, and mask - What three major body air spaces does increasing pressure affect as I descend? A squeeze can occur if you don't adjust for increasing pressure compressing a body air space. A squeeze causes discomfort, and if not corrected can cause injury by pressure imbalance that pushes tissues into an air space. This happens because there is greater pressure outside the air space than inside it. - How can a squeeze occur? What does a squeeze cause, and what can it lead to if not corrected? Why does this happen? Adding air to the air spaces as you descend in order to keep their pressure equal with the outside pressure, so they stay at their normal volume. - What it "equalization"?