PADI Open Water Diver Certification
Scuba Diving Certification Study Guide
Questions and Answers Latest Version
2026/2027 Comprehensive Review
DIN system - Correct answer Regulator screws into valve
What 3 special maintenance considerations do regulators have? - Correct answer
Rinse first stage individually, run water through second stage, have professional
overhaul it about every year
What 2 components make up a scuba cylinder? - Correct answer The aluminum/steel
container and the valve to control air flow
What is a burst disk? - Correct answer A safety device that relieves overpressure by
rupturing and releasing air
What is the most important feature in my weight system? - Correct answer A quick
release that will enable you to float with an uninflated BC
,Why use more than 1 weight system? - Correct answer It will help distribute weight
trim - Correct answer The orientation and balance of a swimmer in the water - the
ideal is horizontal
How does being underwater affect the apparent size or distance of things? - Correct
answer Refraction occurs, where light changes direction, and things are magnified by
1/3
How does water affect light intensity and color? - Correct answer It reflects, scatters,
and absorbs light in the roygbiv order
As you go deeper, it gets darker
How does hearing differ underwater? - Correct answer It travels faster and longer
,How does water's density affect moving in water? - Correct answer It takes more
energy the faster you try to swim
What is "airway control"? - Correct answer The skill of breathing past remaining water
without drawing any into your throat after clearing your regulator/snorkel
What are 2 techniques for airway control? - Correct answer Inhaling slowly, looking
down, and touching your tongue to the roof of your mouth as you inhale
What are 8 symptoms of overexertion while diving? - Correct answer Fatigue, labored
breathing, a feeling of suffocation, weakness, anxiety, headaches, muscle cramping,
and a tendency to panic
What should I do if I think I'm becoming overexerted at the surface and underwater? -
Correct answer Stop all activity, signal your buddy, and rest
What points should a dive plan normally include? - Correct answer Agree on best
entry/exit techniques, decide what course you'll follow, agree on maximum time and
, depth, review underwater signs, determine when you will head back, agree on how
you'll stay together during the dive, establish what you'll do if you become separated,
discuss emergency procedures
How do we conduct the predive safety check? - Correct answer Using Begin With
Review And Friend (BWRAF)
BWRAF - Correct answer BCD, weight, releases, air, final check
What do I do if I get separated from my buddy on a dive? - Correct answer Look for
each other for no more than 1 minute, and then ascend to the surface if you can't find
them
How do my buddy and I manage our air supply together while diving? - Correct answer
Plan your dive around who breathes air the fastest.
Subtract your reserve/ascent supply from your starting pressure to find out how much
pressure you have for the main part of the dive
To be safe, plan to use half your air coming down, and half coming back
Scuba Diving Certification Study Guide
Questions and Answers Latest Version
2026/2027 Comprehensive Review
DIN system - Correct answer Regulator screws into valve
What 3 special maintenance considerations do regulators have? - Correct answer
Rinse first stage individually, run water through second stage, have professional
overhaul it about every year
What 2 components make up a scuba cylinder? - Correct answer The aluminum/steel
container and the valve to control air flow
What is a burst disk? - Correct answer A safety device that relieves overpressure by
rupturing and releasing air
What is the most important feature in my weight system? - Correct answer A quick
release that will enable you to float with an uninflated BC
,Why use more than 1 weight system? - Correct answer It will help distribute weight
trim - Correct answer The orientation and balance of a swimmer in the water - the
ideal is horizontal
How does being underwater affect the apparent size or distance of things? - Correct
answer Refraction occurs, where light changes direction, and things are magnified by
1/3
How does water affect light intensity and color? - Correct answer It reflects, scatters,
and absorbs light in the roygbiv order
As you go deeper, it gets darker
How does hearing differ underwater? - Correct answer It travels faster and longer
,How does water's density affect moving in water? - Correct answer It takes more
energy the faster you try to swim
What is "airway control"? - Correct answer The skill of breathing past remaining water
without drawing any into your throat after clearing your regulator/snorkel
What are 2 techniques for airway control? - Correct answer Inhaling slowly, looking
down, and touching your tongue to the roof of your mouth as you inhale
What are 8 symptoms of overexertion while diving? - Correct answer Fatigue, labored
breathing, a feeling of suffocation, weakness, anxiety, headaches, muscle cramping,
and a tendency to panic
What should I do if I think I'm becoming overexerted at the surface and underwater? -
Correct answer Stop all activity, signal your buddy, and rest
What points should a dive plan normally include? - Correct answer Agree on best
entry/exit techniques, decide what course you'll follow, agree on maximum time and
, depth, review underwater signs, determine when you will head back, agree on how
you'll stay together during the dive, establish what you'll do if you become separated,
discuss emergency procedures
How do we conduct the predive safety check? - Correct answer Using Begin With
Review And Friend (BWRAF)
BWRAF - Correct answer BCD, weight, releases, air, final check
What do I do if I get separated from my buddy on a dive? - Correct answer Look for
each other for no more than 1 minute, and then ascend to the surface if you can't find
them
How do my buddy and I manage our air supply together while diving? - Correct answer
Plan your dive around who breathes air the fastest.
Subtract your reserve/ascent supply from your starting pressure to find out how much
pressure you have for the main part of the dive
To be safe, plan to use half your air coming down, and half coming back
