SDI Final Exam | 65 Questions with 100% Correct Answers | Verified | Updated | 27 Pages Question : 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.
Correct answer: Closer and larger than they do on land.
Question : 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.
Correct answer: All of the above.
Question : 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.
Correct answer: Both the second and the third answer are
correct.
Question : 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.
Correct answer: Water conducts heat away from your body 25
times faster than air does.
Question : 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.
Correct answer: Thermocline.
Question : 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.
Correct answer: All of the above.
Question : 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.
Correct answer: True.
Question : 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.
Correct answer: If caught in a rip current, swim parallel to
shore, until you are completely out of the rip current, then swim in towards shore.