SDI SCUBA DIVING CERTIFICATION
EXAMINATION TEST 2026 FULL QUESTIONS
AND VERIFIED ANSWERS
◉ As you descend:
1: Colors will remain largely the same.
2: Blues and grays disappear quickly.
3: Dive lights have little effect on apparent color.
4: None of the above. Answer: 4 (none of the above)
◉ Water conducts heat away from your body ____x as fast as air does
Answer: 25x
◉ When water stratifies itself into layers, according to temperature,
the boundary between layers is known as a(n): Answer: 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. Answer: 4 (all of the above)
◉ 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. Answer: 2 (Water conducts heat away from your body
25 times faster than air does)
◉ The presence of thermoclines means that:
1: Surface temperatures will provide divers with a good indication of
what they can expect at depth.
2: Divers may require less in the way of exposure protection at depth
than they will at the surface.
3: Divers may require more in the way of exposure protection at
depth than they will at the surface.
4: None of the above. Answer: 3 (Divers may require more in the way
of exposure protection at depth than they will at the surface)
◉ Which of the following statements are true?
,1: Wave height is the distance from its highest point (crest) to its
lowest point (trough).
2: Wave length is the distance from crest to crest.
3: Wave oscillation to calculated by multiplying the wave height
times its length.
4: Both the first and second answers are correct. Answer: 4 (both
the first and second answers are correct)
◉ TRUE OR FALSE: In general, the best time to dive is during slack
tide, the period between high and low tides. Answer: TRUE
◉ TRUE OR FALSE: The sun warming water near the equator,
coupled with the earth's rotation, is the primary cause of permanent
ocean currents. Answer: True
◉ T/F
A wave encountering shallow water begins to slow at it bottom,
while the top of the wave continues at its previous speed. This
causes the wave to break. Answer: true
◉ Which of the following statements is/are true?
1: A rip current is a narrow flow of swiftly moving water that runs
perpendicular to shore.
, 2: Rip currents form when water flowing out to sea is funneled
through a narrow restriction, such as two sandbars or a break in a
coral reef.
3: The force of a rip current generally diminishes in deeper water,
not far beyond the surf zone.
4: All of the above. Answer: All of the above
◉ Which of the following is/are true?
1: Surge is the backwash of water from waves breaking on shore.
2: Surge is the back-and-forth movement of water caused by waves
passing over head.
3: Surge occurs when waves force water between facing rock ledges.
4: None of the above. Answer: 2 (Surge is the back-and-forth
movement of water caused by waves passing over head.)
◉ 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.
3: 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.
EXAMINATION TEST 2026 FULL QUESTIONS
AND VERIFIED ANSWERS
◉ As you descend:
1: Colors will remain largely the same.
2: Blues and grays disappear quickly.
3: Dive lights have little effect on apparent color.
4: None of the above. Answer: 4 (none of the above)
◉ Water conducts heat away from your body ____x as fast as air does
Answer: 25x
◉ When water stratifies itself into layers, according to temperature,
the boundary between layers is known as a(n): Answer: 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. Answer: 4 (all of the above)
◉ 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. Answer: 2 (Water conducts heat away from your body
25 times faster than air does)
◉ The presence of thermoclines means that:
1: Surface temperatures will provide divers with a good indication of
what they can expect at depth.
2: Divers may require less in the way of exposure protection at depth
than they will at the surface.
3: Divers may require more in the way of exposure protection at
depth than they will at the surface.
4: None of the above. Answer: 3 (Divers may require more in the way
of exposure protection at depth than they will at the surface)
◉ Which of the following statements are true?
,1: Wave height is the distance from its highest point (crest) to its
lowest point (trough).
2: Wave length is the distance from crest to crest.
3: Wave oscillation to calculated by multiplying the wave height
times its length.
4: Both the first and second answers are correct. Answer: 4 (both
the first and second answers are correct)
◉ TRUE OR FALSE: In general, the best time to dive is during slack
tide, the period between high and low tides. Answer: TRUE
◉ TRUE OR FALSE: The sun warming water near the equator,
coupled with the earth's rotation, is the primary cause of permanent
ocean currents. Answer: True
◉ T/F
A wave encountering shallow water begins to slow at it bottom,
while the top of the wave continues at its previous speed. This
causes the wave to break. Answer: true
◉ Which of the following statements is/are true?
1: A rip current is a narrow flow of swiftly moving water that runs
perpendicular to shore.
, 2: Rip currents form when water flowing out to sea is funneled
through a narrow restriction, such as two sandbars or a break in a
coral reef.
3: The force of a rip current generally diminishes in deeper water,
not far beyond the surf zone.
4: All of the above. Answer: All of the above
◉ Which of the following is/are true?
1: Surge is the backwash of water from waves breaking on shore.
2: Surge is the back-and-forth movement of water caused by waves
passing over head.
3: Surge occurs when waves force water between facing rock ledges.
4: None of the above. Answer: 2 (Surge is the back-and-forth
movement of water caused by waves passing over head.)
◉ 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.
3: 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.
