NAUI SCUBA Exam Questions with Correct Answers
Underwater basic physics - Answer-Density of H2O = 800X more dense than air
Being underwater effects:
How we hear sounds
Bodies thermal capabilities aka faster heat loss
Our ability to move
And creates Drag Effect
Need to knows about ...
NAUI SCUBA Exam Questions with Correct Answers Underwater basic physics - Answer -Density of H2O = 800X more dense than air Being underwater effects: How we hear sounds Bodies thermal capabilities aka faster heat loss Our ability to move And creates Drag Effect Need to knows about LIGHT underwater - Answer -Light is absorbed as depth increases Warm colors (Red Orange Yellow Green) fade Cool colors (Blue Indigo Violet Remain) Refraction occurs, objects appear 25 -33% bigger underwater Need to knows about SOUND u nderwater - Answer -Sound travels 4X faster Seems Omnidirectional Difficult if not impossible to tell what direction sound is coming from Need to knows about HEAT underwater - Answer -Being underwater conducts heat away from our bodies 25X faster than on land Hyperthermia is a potential issue Needs for thermal protection depend on how much time is spent in the water A drysuit is the best protection from heat loss Movement through water - Answer -Water resists movement, must present minimum surface are a in direction of movement: swim with a proper horizontal trim Fins must be used as primary mode of transportation the 3 States of Buoyancy - Answer -Positive: floating Negative: Sinking Neutral: What we want for scuba diving Inhale to float Exhale to sink *Proper weighting is imperative * Weight of 1 cubic foot of sea water? Fresh water? - Answer -Sea Water: 64 lbs Fresh water: 62.4 lbs What are Squeezes - Answer -Air spaces in body and equipment are subject to a reduction of volume as pressu re underwater increases Squeezes in the body - Answer -Body air spaces: lungs, middle ear, sinuses, stomach, intestines, tooth fillings Squeezes in equipment - Answer -Equipment air spaces: mask, hood, drysuit Pressure Metrics to know - Answer -@sea level = 14.7 psi @ 33ft FSW depth 14.7 psi is exerted .445 psi per ft of depth (.5 psi) Eardrum trauma @ 8 ft depth or 4 psi "Gauge pressure" is zero @ sea level "Absolute Pressure" is gauge + 14.7 psi "Partial pressure" is pressure exerted by separate ga s in air mixture Equalizing Air Spaces - Answer -Lungs: breathe normally Middle Ear: valsalva maneuver Sinuses: normal breathing, clear sinuses Stomach/Intestines: diet
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Scholarsstudyguide. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.39. You're not tied to anything after your purchase.
