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SDI Final Review Exam Questions and Complete Answers Graded A+.
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SDI Final Review Exam Questions and Complete Answers Graded A+.
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SDI Final ReviewExam Questions
and Complete
Answers Graded
A+
Denning [Date] [Course title]
,Objects under water appear 60 percent larger than they do on land. - Answer: true
As you descend: - Answer: Colors appear to fade.
Reds and oranges are among the first colors to disappear.
At 30 m/99 ft, little color remains other than blues, grays, blacks and whites.
All of the above.
Because sound travels faster under water: - Answer: It is harder to determine the direction from which
a sound is coming.
Which of the following is/are true? - Answer: Water conducts heat away from your body 25 times faster
than air does.
When water stratifies itself into layers, according to temperature, the boundary between layers is
known as a(n): - Answer: Thermocline
A wave encountering shallow water begins to slow at it bottom, while the top of the wave continues at
its previous speed. This causes the wave to break. - Answer: true
Surge is the backwash of water from waves breaking on shore. - Answer: false
Which of the following is/are true? - Answer: Tidal currents can be very strong, making diving difficult or
even dangerous.
What is/are the primary cause(s) of permanent ocean currents? - Answer: The sun warming equatorial
ocean water.
Seismic activity deep under water.
The earth's rotation.
Both the first and third answers are correct.
, Which of the following statements is/are true? - Answer: A rip current is a narrow flow of swiftly moving
water that runs perpendicular to shore.
Rip currents form when water flowing out to sea is funneled through a narrow restriction, such as two
sandbars or a break in a coral reef.
The force of a rip current generally diminishes in deeper water, not far beyond the surf zone.
All of the above.
Which of the following best describes the 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.
Which of the following is/are true? - Answer: Surge is the back-and-forth movement of water caused by
waves passing over head.
Which of the following is/are true? - Answer: Tides can make the water at a particular dive site
noticeably deeper or shallower than you may have experienced previously.
Tidal currents can be very strong, making diving difficult or even dangerous.
Strong tidal currents can have an adverse effect on visibility.
All of the above.
Which of the following is not true? - Answer: Longshore currents always move in the same direction.
If caught in a rip current, swim perpendicular to shore, until you are completely out of the rip current,
then swim in towards shore. - Answer: false
Which of the following statements are true? - 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.
Wave oscillation to calculated by multiplying the wave height times its length.
Both the first and second answers are correct.
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