1 | P a g e | © copyright 2024/2025 | Grade A+
SDI Open Water Scuba Diver Exam
Questions and Answers | Latest
Update 2024/2025
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
What does SCUBA mean
✓ ~~> self-contained underwater breathing apparatus
Master01 | September, 2024/2025 | Latest update
, 2 | P a g e | © copyright 2024/2025 | Grade A+
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
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:
Master01 | September, 2024/2025 | Latest update
SDI Open Water Scuba Diver Exam
Questions and Answers | Latest
Update 2024/2025
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
What does SCUBA mean
✓ ~~> self-contained underwater breathing apparatus
Master01 | September, 2024/2025 | Latest update
, 2 | P a g e | © copyright 2024/2025 | Grade A+
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
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:
Master01 | September, 2024/2025 | Latest update
