SDI OPEN WATER SCUBA DIVER
COMPREHENSIVE EXAM STUDY GUIDE
2026 QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Water conducts heat away from your body. Answer: 25 times faster
than air does
⩥ As you descend. Answer: colors fade, reds and oranges fade first, 30
meters seem blue and gray
⩥ water temp does your body need thermal protection. Answer: 86
degrees
⩥ What does SCUBA mean. Answer: self-contained underwater
breathing apparatus
⩥ 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.. Answer: Thermocline
, ⩥ What is the primary cause of waves?. Answer: wind
⩥ Which of the following factors do we take into account when
measuring waves?. Answer: Height, Length
⩥ Which of the following is incorrect?. Answer: Waves are not
hazardous to divers during shore dives
⩥ The consequences of becoming cold under water include the
following except. Answer: improved judgment and coordination
⩥ Because sound travels faster under water:. Answer: Its harder to
determine the direction from which a sound is coming
⩥ Entering through surf requires special skills. These skills are often
included in beginning scuba course taught in areas in which surf entries
are common. Answer: true
⩥ which of the following are true. Answer: Surge is the back-and-forth
movement of water caused by passing over head
COMPREHENSIVE EXAM STUDY GUIDE
2026 QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Water conducts heat away from your body. Answer: 25 times faster
than air does
⩥ As you descend. Answer: colors fade, reds and oranges fade first, 30
meters seem blue and gray
⩥ water temp does your body need thermal protection. Answer: 86
degrees
⩥ What does SCUBA mean. Answer: self-contained underwater
breathing apparatus
⩥ 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.. Answer: Thermocline
, ⩥ What is the primary cause of waves?. Answer: wind
⩥ Which of the following factors do we take into account when
measuring waves?. Answer: Height, Length
⩥ Which of the following is incorrect?. Answer: Waves are not
hazardous to divers during shore dives
⩥ The consequences of becoming cold under water include the
following except. Answer: improved judgment and coordination
⩥ Because sound travels faster under water:. Answer: Its harder to
determine the direction from which a sound is coming
⩥ Entering through surf requires special skills. These skills are often
included in beginning scuba course taught in areas in which surf entries
are common. Answer: true
⩥ which of the following are true. Answer: Surge is the back-and-forth
movement of water caused by passing over head
