SDI Exam Questions with Answers
(Latest Update 2024)
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
, SDI Exam Questions with Answers
(Latest Update 2024)
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.
(Latest Update 2024)
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
, SDI Exam Questions with Answers
(Latest Update 2024)
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.
