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SDI Exam Study Guide with Complete Solutions
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SDI Exam Study Guide with Complete Solutions Objects under water appear: - Answer-Closer and larger than they do on land What happens to colors under water - Answer-As you descend, colors appear to fade, not intensify. Blues and grays are the last remaining colors at depth. Because sound trave...

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  • October 7, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • sdi exam study guide with complete solutions

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EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER
©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED
FIRST PUBLISH SEPTEMBER 2024

SDI Exam Study Guide with Complete
Solutions

Objects under water appear: - Answer✔✔-Closer and larger than they do on land


What happens to colors under water - 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: - 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 -

Answer✔✔-25

The presence of thermoclines means that - Answer✔✔-divers may require more in

the way of exposure protection at depth than they will at the surface.

Tides can: - Answer✔✔-- make water seem deeper or shallower, stronger and

difficult, adverse effect on visibility

Cause of permanent ocean currents - 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 - 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.




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, EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER
©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED
FIRST PUBLISH SEPTEMBER 2024
formation of surf - 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 - Answer✔✔-Surge is the back-and-forth movement of water caused by

waves passing over head.

What causes most aquatic animal bites? - Answer✔✔-An animal's defensive

response to a perceived threat & mistaken identity

To be injured by an animal with poisonous spines, you must: - Answer✔✔-Be the

aggressor and touch the animal first.

The states of buoyancy include all of the following except: - Answer✔✔-Passive

If you feel pain or discomfort during descent: - 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? -

Answer✔✔-

Any time you cannot inhale while scuba diving (such as when a regulator is out of your

mouth), you must be - Answer✔✔-Exhaling.

What can help prevent decompression sickness (DCS) - Answer✔✔-safety stops,

Remain well within your dive computer's no-decompression limit, Ascend no faster than

the rate allowed by the dive computer




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