SDI Exam1 Questions and Answers, Exams of Chemistry

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1. Objects under water appear: - Correct Answer Closer and larger than they do on land
2. What happens to colors under water - Correct Answer As you descend, colors appear to fade, not intensify. Blues and grays are the last remaining colors at depth.
3. Because sound travels faster under water: - Correct Answer Sound's increases speed under water makes it harder to determine the direction from which it is coming.
4. Water conducts heat away from your body ___ times faster than air does - Correct Answer 25
5. The presence of thermoclines means that - Correct Answer divers may require more in the way of exposure protection at depth than they will at the surface.
6. Tides can: - Correct Answer - make water seem deeper or shallower, stronger and difficult, adverse effect on visibility
7. Cause of permanent ocean currents - Correct Answer The sun warming water near the equator, coupled with the earth's rotation, is the primary cause of permanent ocean currents.
8. Wave height and length - Correct Answer Wave height is the distance from its highest point (crest) to its lowest point (trough). Wave length is the distance from crest to crest.
9. formation of surf - Correct Answer A wave encountering shallow water begins to slow at its bottom, while the top of the wave continues at its previous speed. This causes the wave to break.
10. what is surge - Correct Answer Surge is the back-and-forth movement of water caused by waves passing over head.
11. What causes most aquatic animal bites? - Correct Answer An animal's defensive response to a perceived threat & mistaken identity
12. To be injured by an animal with poisonous spines, you must: - Correct Answer Be the aggressor and touch the animal first.

13. The states of buoyancy include all of the following except: - Correct Answer Passive
14. If you feel pain or discomfort during descent: - Correct Answer Ascend to the point where you can comfortably equalize, and only then continue your descent.
15. Which of the following is the best way to prevent or reduce nitrogen narcosis? - Correct Answer
16. Any time you cannot inhale while scuba diving (such as when a regulator is out of your mouth), you must be - Correct Answer Exhaling.
17. What can help prevent decompression sickness (DCS) - Correct Answer safety stops, Remain well within your dive computer's no-decompression limit, Ascend no faster than the rate allowed by the dive computer
18. Contributing factors to decompression sickness can include: - Correct Answer Rapid ascents, 'Pushing" or exceeding your computer's no-decompression limits, Heavy exertion and/or dehydration.
19. best way to prevent or reduce nitrogen narcosis? - Correct Answer Avoid dives below 20 meters/66 feet.
20. Which of the following may indicate that air in a scuba cylinder is contaminated and potentially toxic? - Correct Answer color, odor, taste
21. Desirable mask features include - Correct Answer 1: Soft, silicone skirt. 2: Low internal volume. 3: Snug, comfortable fit.
22. The types of fins commonly used by recreational scuba divers include - Correct Answer full foot and open heel
23. Basic post-dive equipment maintenance and care includes - Correct Answer 1: Rinsing thoroughly with fresh water. 2: Allowing to dry completely. 3: Storing in a cool, dry place, away from direct sunlight.
24. Common exposure suit types include - Correct Answer 1: Dive skins. 2: Wet suits. 3: Dry suits.
25. Your body loses the greatest amount of heat through the - Correct Answer Head.

26. Which of the following is/are important features of a weight system? - Correct Answer There is no established minimum capacity for a weight system. So long as it has a quick-release mechanism and is easy to adjust the amount of weight used, any system that enables you to carry enough ballast to be properly weighted is fine.
27. Popular BC styles include - Correct Answer Jacket-style (wraparound), Back- inflation style
28. A regulator system may include - Correct Answer 1: A first stage and primary second stage. 2: An alternate air source second stage (or a connection to an alternate-air-source inflator on the BC). 3: A submersible pressure gauge (SPG), which is usually part of an instrument console.
29. A regulator equipped with a conventional alternate-air-source second stage: - Correct Answer Conventional alternate-air-source second stages offer the benefit of being widely understood and used, and enable either diver to use either second stage.
30. Scuba cylinders must periodically undergo: - Correct Answer visual inspections and hydrostatic tests, at intervals determined by local laws and regulations, or prevailing standards of practice.
31. The minimum information most dive computers provide you with while in Dive mode include: - Correct Answer 1: Current and maximum dive depth. 2: Actual bottom time. 3: Decompression status (no-deco limit or required deco).
32. A dive knife or cutting tool can be used to - Correct Answer help free entangled divers or signal others under water.
33. Steps in equipment assembly include all of the following except - Correct Answer You want to pressurize (not depressurize) your regulator and then test each second stage.
34. What piece of equipment should never be allowed to dangle freely? - Correct Answer Your alternate-air-source second stage and submersible pressure gauge or instrument console should never be allowed to dangle freely. (It would be nice to clip off the BC power inflator as well, but that is not possible.)
35. After your buddy checks to see that your air is turned all the way on: - Correct Answer take several deep breaths from your regulator while watching your SPG for changes in pressure.

36. Which is the most common boat entry technique for deep water entry on large dive boats? - Correct Answer A giant stride is the most common boat entry technique.
37. The preferred way to remove moisture from a dust cap prior to putting it back in place is to: - Correct Answer The preferred way to remove moisture from a dust cap prior to putting it back in place is to wipe it with a clean, dry towel or cloth.
38. Air passages such as your trachea (windpipe), which may contain air your body can't use, are known as: - Correct Answer Dead air spaces.
39. Common methods for clearing water from a regulator second stage include: - Correct Answer exhaling into the second stage and depressing the purge button.
40. The two most common methods for recovering a regulator that has fallen behind your shoulder are: - Correct Answer Reach, Sweep
41. Contact lens wearers should not close their eyes when clearing a mask. - Correct Answer It is important that contact lens wearers close their eyes when performing this skill, to help prevent accidental lens loss.
42. The key to venting a BC, at the surface or under water, is to: - Correct Answer turn your body so the the exhaust valve is the highest point on the BC air cell.
43. Before adding air to your BC under water, you must: - Correct Answer You need to continue to breathe normally while adding air to your BC.
44. The three As of buoyancy control include - Correct Answer 1: Awareness. 2: Anticipation.
45. Action.
46. Using your arms to swim under water: - Correct Answer Causes you to expend energy needlessly.
47. Among the easiest ways to don a heavy weight belt, at the surface or under water, is to: - Correct Answer Roll into it.
48. You can best don your scuba unit at the surface by: - Correct Answer putting it on like a jacket or sitting on it.
49. Which type of alternate air source does not necessarily require the donor to give up his primary second stage? - Correct Answer Conventional alternate-air- source second stage.

49. During an independent emergency ascent, you should stop periodically and attempt to inhale through your regulator because: - Correct Answer The decreasing pressure may allow your regulator to function, even if it could not do so at depth.
50. Which of the following is among the most effective means of relieving a leg cramp once it has occurred? - Correct Answer Grasp the fin tip of the affected leg and pull towards you while straightening the leg. This stretches the calf muscle.
51. Techniques commonly used to navigate under water include: - Correct Answer natural and compass navigation.
52. Risk management is defined as: - Correct Answer preventing problems while at the same time having a planned response for any emergency.
53. Activities that may increase the risk of decompression sickness include: - Correct Answer alcohol and drug use.
54. Any diver can signal to ______ the dive for any ________ - Correct Answer abort, reason
55. If you and your buddy follow the same plan for dealing with buddy separation, you will end up meeting either on the _________ or ________ ___________. - Correct Answer Surface, under water
56. Divers should plan to ascend as soon as the first diver: - Correct Answer reaching your maximum agreed-upon depth, so long as you do not exceed it.
57. Should you accidentally exceed your dive computer's no-decompression limit. - Correct Answer Air permitting, make the decompression stop indicated by your dive computer. Afterward, monitor for signs and symptoms of decompression sickness.
58. If your buddy is unable to swim on his own, you can: - Correct Answer you can tow him on the surface.
59. First aid for suspected decompression sickness may include: - Correct Answer 1: Activate the Emergency Medical Service (EMS) system and contact the Divers Alert Network (DAN). 2: Monitor the patient's vital signs.
60. Administer pure oxygen.
61. A rip current is a narrow flow of swiftly moving water that runs ____ to shore. - Correct Answer perpendicular

61. Rip currents form when - Correct Answer water flowing out to sea is funneled through a narrow restriction, such as two sandbars or a break in a coral reef.
62. A scuba cylinder that normally lasts one hour at the surface will last _______ minutes at 20 meters/66 feet. - Correct Answer 20
63. A repetitive dive is any dive: - Correct Answer any dive made within 24 hours of a previous dive, or in which your computer indicates there is residual nitrogen left in your system from a prior dive.
64. Should you become entangled under water: - Correct Answer do not struggle in an effort to free yourself. If you cannot easily untangle yourself, have your buddy do it for you.
65. Seasickness medications are only effective if taken well in ____ of the onset of symptoms. - Correct Answer advance