1 | P a g e | © copyright 2024/2025 | Grade A+
SDI Open Water Scuba Diver Exam
Questions and Answers (100% Pass)
Objects under water appear
→ Closer and larger than they do on land
How much faster does sound travel in water, compared to air?
→ 4 times
Water conducts heat away from your body
→ 25 times faster than air does
As you descend
→ colors fade, reds and oranges fade first, 30 meters seem blue
and gray
water temp does your body need thermal protection
→ 86 degrees
Master01 | September, 2024/2025 | Latest update
, 1 | P a g e | © copyright 2024/2025 | Grade A+
What does SCUBA mean
→ 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.
→ Thermocline
What is the primary cause of waves?
→ wind
Which of the following factors do we take into account when measuring
waves?
→ Height, Length
Master01 | September, 2024/2025 | Latest update
, 1 | P a g e | © copyright 2024/2025 | Grade A+
Which of the following is incorrect?
→ Waves are not hazardous to divers during shore dives
The consequences of becoming cold under water include the following
except
→ improved judgment and coordination
Because sound travels faster under water:
→ 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
→ true
which of the following are true
→ Surge is the back-and-forth movement of water caused by
passing over head
Master01 | September, 2024/2025 | Latest update
SDI Open Water Scuba Diver Exam
Questions and Answers (100% Pass)
Objects under water appear
→ Closer and larger than they do on land
How much faster does sound travel in water, compared to air?
→ 4 times
Water conducts heat away from your body
→ 25 times faster than air does
As you descend
→ colors fade, reds and oranges fade first, 30 meters seem blue
and gray
water temp does your body need thermal protection
→ 86 degrees
Master01 | September, 2024/2025 | Latest update
, 1 | P a g e | © copyright 2024/2025 | Grade A+
What does SCUBA mean
→ 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.
→ Thermocline
What is the primary cause of waves?
→ wind
Which of the following factors do we take into account when measuring
waves?
→ Height, Length
Master01 | September, 2024/2025 | Latest update
, 1 | P a g e | © copyright 2024/2025 | Grade A+
Which of the following is incorrect?
→ Waves are not hazardous to divers during shore dives
The consequences of becoming cold under water include the following
except
→ improved judgment and coordination
Because sound travels faster under water:
→ 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
→ true
which of the following are true
→ Surge is the back-and-forth movement of water caused by
passing over head
Master01 | September, 2024/2025 | Latest update
