SDI EXAM 2024|25 ACTUAL QUESTIONS AND AND ANSWERS ALREADY GRADED A+
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Course
SDI.
Institution
SDI.
SDI EXAM 2024|25 ACTUAL QUESTIONS AND AND ANSWERS ALREADY GRADED A+
Objects under water appear: - Closer and larger than they do on land
What happens to colors under water - As you descend, colors appear to fade, not intensify. Blues and grays are the last remaining colors at depth.
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SDI EXAM 2024|25 ACTUAL QUESTIONS AND
AND ANSWERS ALREADY GRADED A+
Objects under water appear: - Closer and larger than they do on land
What happens to colors under water - 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: - 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 - 25
The presence of thermoclines means that - divers may require more in the way of
exposure protection at depth than they will at the surface.
Tides can: - - make water seem deeper or shallower, stronger and difficult, adverse
effect on visibility
Cause of permanent ocean currents - 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 - 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 - 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 - Surge is the back-and-forth movement of water caused by waves
passing over head.
What causes most aquatic animal bites? - An animal's defensive response to a
perceived threat & mistaken identity
To be injured by an animal with poisonous spines, you must: - Be the aggressor and
touch the animal first.
The states of buoyancy include all of the following except: - Passive
If you feel pain or discomfort during descent: - 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? -
Any time you cannot inhale while scuba diving (such as when a regulator is out of your
mouth), you must be - Exhaling.
What can help prevent decompression sickness (DCS) - 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: - Rapid ascents, 'Pushing"
or exceeding your computer's no-decompression limits, Heavy exertion and/or
dehydration.
best way to prevent or reduce nitrogen narcosis? - Avoid dives below 20 meters/66
feet.
Which of the following may indicate that air in a scuba cylinder is contaminated and
potentially toxic? - color, odor, taste
Desirable mask features include - 1: Soft, silicone skirt.
2: Low internal volume.
3: Snug, comfortable fit.
The types of fins commonly used by recreational scuba divers include - full foot and
open heel
Basic post-dive equipment maintenance and care includes - 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 - 1: Dive skins.
2: Wet suits.
3: Dry suits.
Your body loses the greatest amount of heat through the - Head.
Which of the following is/are important features of a weight system? - 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 - Jacket-style (wraparound), Back-inflation style
A regulator system may include - 1: A first stage and primary second stage.
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