SDI Certification Exam Review:
Questions & Answers
What should you do if you suddenly feel sick and develop a headache
during a scuba dive?
(Ans- Abort dive and controlled ascent. Breathe fresh air or oxygen
As pressure increases
(Ans- Volume decreases
What is the main purpose of a snorkel?
(Ans- Allows you to conserve air from your scuba cylinder at long intervals
of time at the surface
How do you know if your mask fits correctly?
(Ans- Will tighten to your face and won't fall off via suction through your
nose
Name one audible and one visual rescue signal device
(Ans- Whistle/horn
Bright-colored lift bag
Name two basic fin designs
(Ans- Full-foot and open-heel
What is the main difference between a wet suit and a dry suit?
(Ans- Dry suit is designed with an integrated inflation system to keep body
completely out of contact with water. Dry suits keep divers completely dry
for use in cold water (below 50 degrees)
, What extra attire can provide warmth?
(Ans- Hood, hooded vests, boots, gloves, caps
List the four functions of a dive computer
(Ans- Depth, dive time, ascent rate, surface interval time
Define no-stop time
(Ans- Amount of time remaining at any point during the dive before a
necessary decompression stop
What two ways do a PDC alert you on ascending too fast?
(Ans- Blink and ascent alarm
How do you determine a time limit a repetitive dive from a PDC?
(Ans- Surface mode shows depths ranging every ten feet with the no-stop
time limits adjusted for current depth
What are the two modes of operation of a dive computer?
(Ans- Surface and dive modes
What are the two types of weight systems?
(Ans- Weight belt
Weight-integrated BCD
What are the two types of dive flags?
(Ans- International flag
Diver-down flag
Describe the function of regulator first stage and second stage
(Ans- First stage - attaches to tank valve and reduces the high-pressure air
to intermediate pressure
Second stage - delivers air at ambient pressure directly to the diver
Questions & Answers
What should you do if you suddenly feel sick and develop a headache
during a scuba dive?
(Ans- Abort dive and controlled ascent. Breathe fresh air or oxygen
As pressure increases
(Ans- Volume decreases
What is the main purpose of a snorkel?
(Ans- Allows you to conserve air from your scuba cylinder at long intervals
of time at the surface
How do you know if your mask fits correctly?
(Ans- Will tighten to your face and won't fall off via suction through your
nose
Name one audible and one visual rescue signal device
(Ans- Whistle/horn
Bright-colored lift bag
Name two basic fin designs
(Ans- Full-foot and open-heel
What is the main difference between a wet suit and a dry suit?
(Ans- Dry suit is designed with an integrated inflation system to keep body
completely out of contact with water. Dry suits keep divers completely dry
for use in cold water (below 50 degrees)
, What extra attire can provide warmth?
(Ans- Hood, hooded vests, boots, gloves, caps
List the four functions of a dive computer
(Ans- Depth, dive time, ascent rate, surface interval time
Define no-stop time
(Ans- Amount of time remaining at any point during the dive before a
necessary decompression stop
What two ways do a PDC alert you on ascending too fast?
(Ans- Blink and ascent alarm
How do you determine a time limit a repetitive dive from a PDC?
(Ans- Surface mode shows depths ranging every ten feet with the no-stop
time limits adjusted for current depth
What are the two modes of operation of a dive computer?
(Ans- Surface and dive modes
What are the two types of weight systems?
(Ans- Weight belt
Weight-integrated BCD
What are the two types of dive flags?
(Ans- International flag
Diver-down flag
Describe the function of regulator first stage and second stage
(Ans- First stage - attaches to tank valve and reduces the high-pressure air
to intermediate pressure
Second stage - delivers air at ambient pressure directly to the diver
