SDI Final Exam Questions and
Answers 100% Pass
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.
1
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,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.
2
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,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.
3
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, 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.
4
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Answers 100% Pass
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.
1
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,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.
2
100% Pass Guarantee Katelyn Whitman, All Rights
,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.
3
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, 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.
4
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