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SDI Exam 65 Questions and Correct Answers.
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SDI Exam 65 Questions and Correct Answers.SDI Exam 65 Questions and Correct Answers.SDI Exam 65 Questions and Correct Answers.
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SDI Exam 65 Questions and Correct Answers.Objects under water appear: - Correct Answer Closer and larger than they do on land
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.
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.
Water conducts heat away from your body ___ times faster than air does - Correct
Answer 25
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.
Tides can: - Correct Answer - make water seem deeper or shallower, stronger and
difficult, adverse effect on visibility
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.
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.
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.
What is surge - Correct Answer Surge is the back-and-forth movement of water caused
by waves passing over head.
What causes most aquatic animal bites? - Correct Answer An animal's defensive
response to a perceived threat & mistaken identity
To be injured by an animal with poisonous spines, you must: - Correct Answer be the
aggressor and touch the animal first.
The states of buoyancy include all of the following except: - Correct Answer Passive
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.
Which of the following is the best way to prevent or reduce nitrogen narcosis? - Correct
Answer
, Any time you cannot inhale while scuba diving (such as when a regulator is out of your
mouth), you must be - Correct Answer Exhaling.
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?
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.
Best way to prevent or reduce nitrogen narcosis? - Correct Answer Avoid dives below
20 meters/66 feet.
Which of the following may indicate that air in a scuba cylinder is contaminated and
potentially toxic? - Correct Answer color, odor, and taste
Desirable mask features include - Correct Answer 1: Soft, silicone skirt.
2: Low internal volume.
3: Snug, comfortable fit.
The types of fins commonly used by recreational scuba divers include - Correct Answer
full foot and open heel
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.
Common exposure suit types include - Correct Answer 1: Dive skins.
2: Wet suits.
3: Dry suits.
Your body loses the greatest amount of heat through the - Correct Answer Head.
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.
Popular BC styles include - Correct Answer Jacket-style (wraparound), Back-inflation
style
A regulator system may include - Correct Answer 1: A first stage and primary second
stage.
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