NAUI SCUBA Exam | Verified Exam Questions and Answers | Latest
Updated Study Material 2026
Question:
Underwater basic physics
Answer:
Density of H2O = 800X more dense
than air
Question:
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
Question:
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 underwater
Answer:
Sound travels 4X
faster
Question:
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
Question:
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 area in direction of movement: swim with a proper horizontal trim
Question:
Fins must be used as primary mode of transportation
the 3 States of Buoyancy
Answer:
Positive: floating
Question:
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
Question:
Fresh water: 62.4 lbs
What are Squeezes
Updated Study Material 2026
Question:
Underwater basic physics
Answer:
Density of H2O = 800X more dense
than air
Question:
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
Question:
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 underwater
Answer:
Sound travels 4X
faster
Question:
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
Question:
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 area in direction of movement: swim with a proper horizontal trim
Question:
Fins must be used as primary mode of transportation
the 3 States of Buoyancy
Answer:
Positive: floating
Question:
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
Question:
Fresh water: 62.4 lbs
What are Squeezes
