SDI Final Exam Questions and Verified Rationalized Answers 100% Guaranteed Pass

SDI Final Exam Questions and Verified Rationalized Answers
100% Guaranteed Pass


1. Objects under water appear: v v v


1: The same size as they do on land. 2: Twic
v v v v v v v v v v


e as large as they do on land.
v v v v v v v


3: Closer and larger than they do on land.
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4: Smaller and farther away than they do on land.: Closer and larger than they do on land.
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2. As you descend: v v


1: Colors appear to fade.
v v v v


2: Reds and oranges are among the first colors to disappear.
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3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. 4: All of the a
v v v v v v v v v v v v v v v v v v v


bove.: All of the above. v v v v


3. Which of the following statements is true? There may be more than one correct ans
v v v v v v v v v v v v v v


wer.
1: Water is 400 times denser than air. 2: Wa
v v v v v v v v v


ter is 800 times denser than air.
v v v v v v


3: Sound travels about four times faster underwater.
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4: Both the second and the third answer are correct.: Both the second and the third answer a
v v v v v v v v v v v v v v v v v


correct.
v


4. Which of the following is/are true? v v v v v


1: Water conducts heat away from your body ten times faster than air does. 2: Water cond
v v v v v v v v v v v v v v v v


ucts heat away from your body 25 times faster than air does.
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3: Fresh water conducts heat away from your body faster than salt water does. 4: Salt water
v v v v v v v v v v v v v v v v v


conducts heat away from your body faster than fresh water does.: Water conducts heat aw
v v v v v v v v v v v v v v


ay from your body 25 times faster than air does.
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5. When water stratifies itself into layers, according to temperature, the bound-
v v v v v v v v v v


ary between layers is known as a(n):
v v v v v v v


1: Halocline.
v




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,2: Ichtyocline.
v


3: Thermodyne.
v


4: Thermocline.: Thermocline.
v v


6. Which of the following is/are true?
v v v v v


1: Tides can make the water at a particular dive site noticeably deeper or shallower than yo
v v v v v v v v v v v v v v v v


may have experienced previously.
v v v


2: Tidal currents can be very strong, making diving difficult or even danger- ous.
v v v v v v v v v v v v v


3: Strong tidal currents can have an adverse effect on visibility. 4: All of the
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above.: All of the above.
v v v v


7. The sun warming water near the equator, coupled with the earth's rotation, is the prima
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ry cause of permanent ocean currents.
v v v v v




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, 1: True. v


2: False.: True.
v v


8. Which of the following is/are true? v v v v v


1: If caught in a rip current, swim directly towards shore, using the most powerful kick poss
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ble.
2: If caught in a rip current, swim perpendicular to shore, until you are com-
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vpletely out of the rip current, then swim in towards shore.
v v v v v v v v v v


3: If caught in a rip current, swim parallel to shore, until you are completely out of the rip c
v v v v v v v v v v v v v v v v v v v


urrent, then swim in towards shore. v v v v v


4: Don't fight the rip current; relax and let it carry you closer to shore.: If caught in a rip current
v v v v v v v v v v v v v v v v v v v v


, swim parallel to shore, until you are completely out of the rip current, then swim in towards sh
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ore.
9. We measure waves by their height and weight. 1: True.
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2: False.: False.
v v




Explanation:
We measure waves by their height and length.
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10. Which of the following best describes the formation of surf? v v v v v v v v v


1: Waves energy, rebounding from its impact with shore, crashes into oncom-
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ving waves, causing them to break.
v v v v v


2: Entering shallow water forces wave energy upward, making the wave crest unstable and
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ausing it to break. v v v


3: A wave encountering shallow water begins to slow at its bottom, while the top of the w
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ave continues at its previous speed.This causes the wave to break.
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4: As waves enter shallow water, the distance between wave crests (wave length) shorten
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increasing the tendency to break.: Only the third answer (A wave encountering shallow water
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egins to slow at it bottom, while the top of the wave continues at its previous speed; this cause
v v v v v v v v v v v v v v v v v v


he wave to break) is correct.
v v v v v


11. Surge:
1: Occurs when waves force water between facing rock ledges.
v v v v v v v v v


2: Is the back-and-forth movement of water caused by waves passing over head.
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