SDI Certification 68 Exam Review
How do you conduct a safety stop? - ✔ ✔ Conducted at 15 ft for 3-5
minutes before surfacing
How do you determine a time limit a repetitive dive from a PDC? - ✔ ✔
Surface mode shows depths ranging every ten feet with the no-stop time
limits adjusted for current depth
How do you know if your mask fits correctly? - ✔ ✔ Will tighten to your
face and won't fall off via suction through your nose
How do you treat a sting? - ✔ ✔ Hot water or vinegar
How many times more dense is air in a balloon at 4 atm compared to the air
density at the surface? - ✔ ✔ 4 times
How much air should remain in your cylinder upon completing a dive? - ✔
✔ 500 psi
How much faster does sound move through water than air and why? - ✔
✔ 4 times faster in water
Water is 800x denser than air; sound travels through denser mediums at
faster rates
How much larger and closer do objects appear under water and why? - ✔
✔ 33% larger, 25% closer
, Light bends in the air-space between the lens and your eyes.
List the three important scuba diving changes that occurred in the 1950s - ✔
✔ 1) Dive tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially available
List three different reasons that it is advisable to check with your local dive
center before diving in an unfamiliar area. - ✔ ✔ 1) Rip currents could
be prevalent
2) Thermoclines could affect thermal protection
3) YOU ARE SUBJECT TO LOCALITY (be aware of laws and regulations
List two feelings of being "narked" - ✔ ✔ Euphoric, anxious
Long shore current - ✔ ✔ Flows parallel to shore
Name one audible and one visual rescue signal device - ✔ ✔
Whistle/horn
Bright-colored lift bag
Name the four water entries - ✔ ✔ Controlled seated entry
Back roll entry
Giant stride entry
Shore entry
How do you conduct a safety stop? - ✔ ✔ Conducted at 15 ft for 3-5
minutes before surfacing
How do you determine a time limit a repetitive dive from a PDC? - ✔ ✔
Surface mode shows depths ranging every ten feet with the no-stop time
limits adjusted for current depth
How do you know if your mask fits correctly? - ✔ ✔ Will tighten to your
face and won't fall off via suction through your nose
How do you treat a sting? - ✔ ✔ Hot water or vinegar
How many times more dense is air in a balloon at 4 atm compared to the air
density at the surface? - ✔ ✔ 4 times
How much air should remain in your cylinder upon completing a dive? - ✔
✔ 500 psi
How much faster does sound move through water than air and why? - ✔
✔ 4 times faster in water
Water is 800x denser than air; sound travels through denser mediums at
faster rates
How much larger and closer do objects appear under water and why? - ✔
✔ 33% larger, 25% closer
, Light bends in the air-space between the lens and your eyes.
List the three important scuba diving changes that occurred in the 1950s - ✔
✔ 1) Dive tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially available
List three different reasons that it is advisable to check with your local dive
center before diving in an unfamiliar area. - ✔ ✔ 1) Rip currents could
be prevalent
2) Thermoclines could affect thermal protection
3) YOU ARE SUBJECT TO LOCALITY (be aware of laws and regulations
List two feelings of being "narked" - ✔ ✔ Euphoric, anxious
Long shore current - ✔ ✔ Flows parallel to shore
Name one audible and one visual rescue signal device - ✔ ✔
Whistle/horn
Bright-colored lift bag
Name the four water entries - ✔ ✔ Controlled seated entry
Back roll entry
Giant stride entry
Shore entry
