SDI SCUBA Exam | SDI Final Exam Questions and 100% Correct Answers | Self-Assessment Rated A+

SDI SCUBA Exam | SDI Final Exam Questions and 100% Correct Answers
2024-2025 | Self-Assessment Rated A+
Question 1
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Objects under water appear:
Question 1Select one:
The same size as they do on land. Twice as
large as they do on land. Closer and larger
than they do on land.
Smaller and farther away than they do on land.
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Objects under water appear both closer and larger than they do on land.
The correct answer is: Closer and larger than they do on land.
Question 2
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As you descend:
Question 2Select one:
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.
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All of the supplied answers are true.
The correct answer is: All of the above.
Question 3
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How much faster does sound travel in water, compared to air?
Question 3Select one:
Twice as fast.
Four times as fast. Over
200 times as fast.

,Over 800 times as fast.
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Sound travels approximately four times faster under water. (Water is 800
times denser than air.)
The correct answer is: Four times as fast.

Question 4
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Water conducts heat away from your body:
Question 4Select one:
Twice as fast as air does.
Four times faster than air does.Ten
times faster than air does.
Twenty-five times faster than air does.
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Water conducts heat away from your body 25 times faster than air does.
The correct answer is: Twenty-five times faster than air does.
Question 5
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The presence of thermoclines means that:
Question 5Select one:
Surface temperatures will provide divers with a good indication of what theycan expect
at depth.
Divers may require less in the way of exposure protection at depth than theywill at the
surface.
Divers may require more in the way of exposure protection at depth thanthey will at
the surface.
None of the above.
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The presence of thermoclines means that divers may require more in the
way of exposure protection at depth than they will at the surface.
The correct answer is: Divers may require more in the way of exposure
protection at depth than they will at the surface.
Question 6

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Which of the following is not true?
Question 6Select one:
Entering shallow water causes the base of a wave to slow.
Entering shallow water forces wave energy upward, making the wave crestunstable and
causing it to break.
If the bottom of a wave moves faster than the top, the wave will break.Both the
first and second answers are true.
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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.
The correct answer is: If the bottom of a wave moves faster than the top, the
wave will break.

Question 7
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Surge is the backwash of water from waves breaking on shore.
Question 7Select one:
True
False
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Surge is the back-and-forth movement of water caused by waves passing
over head.
The correct answer is 'False'.

Question 8
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In general, the best time to dive is during slack tide, the period between highand low
tides.
Question 8Select one:
True