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NAUI Scuba Exam Questions and Answers
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NAUI Scuba Exam Questions and Answers
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NAUI Scuba Exam Questions andAnswers
Cold water diving - Answer -70 degrees or colder
What is the best protection to avoid body heat loss? - Answer -dry suit
water conducts heat away from the body _____ times faster than air - Answer -25
What does being underwater affect? - Answer -vision, hearing, density, buoyancy,
temperature
How is vision affected underwater? - Answer -1. refraction - makes objects look bigger
and closer
2. absorption - shortwave lengths (ROY G BIV) lose color in that order
How is hearing affect underwater? - Answer -1. sound travels faster
2. sound becomes omnidirectional
Sound travels __ times faster underwater - Answer -4
What is the radius of a dive flag - Answer -100ft
water is ____ times denser than air - Answer -800
Will you be more buoyant in saltwater or freshwater? - Answer -saltwater
Why are you more buoyant in saltwater? - Answer -Saltwater is denser than fresh so
you have to go deeper to reach the same pressure (33ft compared to 34.5ft)
Steel tanks are ____ than aluminum - Answer -better
True or false: a properly weighted diver should float with their lungs full and sink with
their lungs empty - Answer -True
On land what is the pressure? in atm and psi - Answer -1 atm = 14.7 psi
, Boyle's Law - Answer -inverse relationship between pressure and volume
Including 1 atm at the surface, what is the pressure at 8ft underwater? - Answer -(using
~30ft = 1 atm = 15 psi) (aka 2ft = 1 psi)
15psi (1 atm on land) + 4psi (underwater) = 19psi
True or fasle: you can theoretically rupture your ears at 8ft - Answer -True
What are the seven types of squeezes? - Answer -Ears, lungs, sinsuses, mask, dry suit,
stomach/instines, teeth
How can you fix a squeeze/ - Answer -equalize pressure by adding air
What are two types of reverse squeezes? - Answer -sinuses can fill with blood, stomach
can create a gaseous accumulation
1/2 psi = - Answer -1 ft depth
What is the cause of a lung over expansion injury? - Answer -holding your breath and
ascending
What is the prevention of a lung over expansion injury? - Answer -breathe normally
What are the four medical conditions of a lung over expansion? (from least to worst) -
Answer -Pneumothorax, mediastinal emphysema, subcutaneous emphysema, cerebral
air embolism
Pneumothorax - Answer -air starts to build under your rib cage from a collapsed lung
Pneumothorax symptoms - Answer -pain in your side, difficulty breathing, blood in your
spit
mediastinal emphysema - Answer -rip in lungs under your sternum
mediastinal emphysema symptoms - Answer -squeezing in chest (think its a heart
attack), pink foam (aerated spit)
subcutaneous emphysema - Answer -rip in the top part of lungs, air rises in chest
subcutaneous emphysema symptoms - Answer -visible air bubbles under skin around
your neck and shoulders, feels like choking, vocal changes, difficulty breathing
Cerebral air embolism - Answer -aka "divers stroke"
air blockage to brain
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