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http://www.passscuba.com/ 1.Nitrogen narcosis most commonly happens at a depth of 18 meters/60 feet. A. TRUE B. FALSE Answer: B 2.What would happen to a balloon that is filled with air at 10meters/33 feet if you bring it to the surface? A. The balloon will shrink to half its original size and the density of the air will decrease by half. B. The balloon will expand to twice its size and the density of the air will decrease by half. C. The balloon will shrink to half its original size and the density of the air will increase by a factor of 2. D. The balloon will expand to twice its size and the air density will increase by a factor of 2. Answer: B Feedback: For all intents and purposes you cannot compress a liquid or a solid by applying greater pressure, but you can compress a gas as the molecules are further apart. Boyle’s Law states that the volume of a gas is inversely proportional to the surrounding pressure on the gas. With Density it’s all the other way around because as you squash the gas the deeper you go and make its volume smaller you increase its density – if the gas expands (when going up) then you decrease its density. What does this mean? When calculating densities you divide when you go up and multiply when you go down. The opposite of calculating volumes. This comes into effect when calculating air consumption. In this case, we start at 10 meters/33 feet, or 2 ata. This means that the volume of air in the balloon at 2 ata is decreased by 2 times would it would be at the surface. Inversely, at the surface the air volume will increase by 2 times, expanding the balloon. The density is greater at depth, but will decrease when it goes up. So the balloon filled with air will expand at the surface and the density of the air will decrease. The correct answer is: The balloon will expand to twice its size and the density of the air will decrease by half. 3.If you took a glass filled with air and you took it down to 10 meters/33 feet, what would happen to the volume of air in the glass? A. The volume would be reduced by half of what it was on the surface 100% pass
http://www.passscuba.com/ B. The volume would be increased by 3 times what it was on the surface C. The volume would be reduced by 3 times what it was on the surface D. The volume would be increased by 2 times what it was on the surface Answer: A 4.The best thing you can do if you are close to your buddy and you run out of air is to: A. Switch to your own alternate air source (octopus) B. Perform a CESA, making sure that you make a continuous Ahhhh sound on the way up C. Use your buddy's alternate air source D. Get rid of your weights and ascend to the surface Answer: C Feedback: Keep in mind, if you run out of air, then switching to your octopus will not do any good because you are out of air. The octopus is hooked into your tank which is out of air. The correct answer is: use your buddy's alternate air source 5.If the air in your tank lets you breath for 30 minutes at the surface, then the same tank of air would last for 15 minutes at a depth of 20 meters/65 feet. A. TRUE B. FALSE Answer: B Feedback: If you know your air consumption at the surface, in this case your air lasts 30 minutes, then it's easy to calculate how long your air will last at a certain depth. If you descend to 20 meters/65 feet and you are breathing normally, then you are now breathing air at 3 ata or 1/3 of what you were at the surface. In this case, if you started with 30 minutes at the surface, then 1/3rd of 30 minutes would be 10 minutes. This means that with the same tank of air, you would be able to breath for 10 minutes at 20 meters/65 feet. If you know your air consumption at the surface, in this case your air lasts 30 minutes, then it's easy to calculate how long your air will last at a certain depth. If you descend to 20 meters/65 feet and you are breathing normally, then you are now breathing air at 3 ata or 1/3 of what you were at the surface. In this case, if you started with 30 minutes at the surface, then 1/3rd of 30 minutes would be 10 minutes. This means that with the same tank of air, you would be able to breath for 10 minutes at 20 meters/65 feet. 100% pass
http://www.passscuba.com/ The correct answer is 'False'. 6.If you find yourself separated from your buddy, the best course of action to take is to ascend to the surface and check if they are at the surface, if not, descend and perform a search pattern. A. TRUE B. FALSE Answer: B 7.You do a dive to 18 meters/59 feet for 27 minutes. After a 43 minute surface interval, you want to do another dive to 17 meters/56 feet. What is the maximum allowable time for the second dive? A. Metric - 37 minutes, or Imperial - 29 minutes B. Metric - 40 minutes, or Imperial - 39 minutes C. Metric - 16 minutes, or Imperial - 14 minutes D. Metric - 53 minutes, or Imperial - 61 minutes Answer: B 8.Which of the following allows the regulator to be screwed directly into the tank valve? A. Dual tank manifold B. K valve C. DIN D. Yoke screw Answer: C 9.If you see a diver at the surface making rapid movements and their mask is off their head, they are most likely a little tired and they trying to exit the water. A. TRUE B. FALSE Answer: B 10.One great way to save air while scuba diving is to move quickly, but efficiently. A. True B. False Answer: B. Feedback: A great strategy for conserving air is to move slowly and efficiently. Moving quickly will take more air and will make you more tireD. The correct answer is 'False'.
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