SDI Final Exam | 65 Questions with 100% Correct Answers | Verified | Updated 2023 | 27 Pages
SDI Final Exam
Objects under water appear:
1: The same size as they do on land.
2: Twice as large as they do on land.
3: Closer and larger than they do on land.
4: Smaller and farther away than they do on land. – ✔✔Closer and larger than they do on land.
As you descend:
1: Colors appear to fade.
2: Reds and oranges are among the first colors to disappear.
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites.
4: All of the above. – ✔✔All of the above.
Which of the following statements is true? There may be more than one correct answer.
1: Water is 400 times denser than air.
2: Water is 800 times denser than air.
3: Sound travels about four times faster underwater.
4: Both the second and the third answer are correct. – ✔✔Both the second and the third answer
are correct.
Which of the following is/are true?
1: Water conducts heat away from your body ten times faster than air does.
2: Water conducts heat away from your body 25 times faster than air does.
3: Fresh water conducts heat away from your body faster than salt water does.
4: Salt water conducts heat away from your body faster than fresh water does. – ✔✔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):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. – ✔✔Thermocline.
Which of the following is/are true?
1: Tides can make the water at a particular dive site noticeably deeper or shallower than you may
have experienced previously.
2: Tidal currents can be very strong, making diving difficult or even dangerous.
3: Strong tidal currents can have an adverse effect on visibility.
4: All of the above. – ✔✔All of the above.
The sun warming water near the equator, coupled with the earth’s rotation, is the primary cause
of permanent ocean currents.
1: True.
2: False. – ✔✔True.
Which of the following is/are true?
1: If caught in a rip current, swim directly towards shore, using the most powerful kick possible.
2: If caught in a rip current, swim perpendicular to shore, until you are completely out of the rip
current, then swim in towards shore.
3: If caught in a rip current, swim parallel to shore, until you are completely out of the rip
current, then swim in towards shore.
4: Don’t fight the rip current; relax and let it carry you closer to shore. – ✔✔If caught in a rip
current, swim parallel to shore, until you are completely out of the rip current, then swim in
towards shore.
We measure waves by their height and weight.
1: True.
2: False. – ✔✔False.
Explanation:
We measure waves by their height and length.
Which of the following best describes the formation of surf?
1: Waves energy, rebounding from its impact with shore, crashes into oncoming waves, causing
them to break.
2: Entering shallow water forces wave energy upward, making the wave crest unstable and
causing it to break.
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