ADCI Surface Supplied Mixed Gas Diver
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales 2026
SCUBA - ANSWER---Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? -
ANSWER---1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the
pressure? - ANSWER---The deeper you go in water, the more the
pressure increases
Pressure is expressed as the weight of air
What is the relationship between pressure, and the volume and the
density of air? - ANSWER---As pressure increases, the gas volume
decreases and the gas density increases
If I take a volume of air from one depth to another depth, how much
will the volume and density change? - ANSWER---Volume will be
1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I
descend? - ANSWER---Ears, sinuses, mask
What is a "squeeze"? - ANSWER---The discomfort caused by pressure
imbalance pulling tissue into the air space
, ADCI Surface Supplied Mixed Gas Diver
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales 2026
What is "equalization"? - ANSWER---The addition of air to your air
spaces as you descend
How do I equalize as I descend? - ANSWER---For ears and sinuses,
pinch your nose and blow gently, or wiggle your jaw and swallow
For mask, blow into it with nose
How often should I equalize? - ANSWER---Every meter/few feet,
BEFORE you feel discomfort
What should I do if I can't equalize? - ANSWER---Stop your descent,
signal problem and point to your ear, ascend a bit, and try again
What can happen if I don't or can't equalize gently and keep
descending? - ANSWER---Fluid can rupture the eardrum
Bruising around the face can occur
Why does a congestion from a cold or allergy temporarily keep me
from diving? - ANSWER---Congestion might block normal air flow,
making equalization difficult or impossible
Why should I never dive with earplugs? - ANSWER---They create air
spaces that you can't equalize
What other body air spaces are affected by increasing pressure?
How do I equalize them? - ANSWER---In filled teeth - go to a dentist
, ADCI Surface Supplied Mixed Gas Diver
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales 2026
In a dry suit - learn from an instructor
Lungs - breathe normally and continuously
What is the most important rule in scuba diving? - ANSWER---
Breathe continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba
diving? - ANSWER---Your lungs will over expand and rupture
What is a "reverse block"? - ANSWER---When expanding air becomes
trapped in your body air spaces as you ascend
What should I do if I feel discomfort in my ears, sinuses, stomach,
intestines, or teeth while ascending? - ANSWER---Stop your ascent
and descend a meter/few feet to reduce discomfort and give
trapped air time to work its way out
How does depth affect how long my air supply lasts? - ANSWER---
The deeper you are, the more dense air you breathe, and the faster
you use the air in your cylinder. Compared to the surface, air supply
lasts 1/#ata as long along with other factors
What's the most efficient way to breathe dense air underwater? -
ANSWER---Take slow, deep breaths
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales 2026
SCUBA - ANSWER---Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? -
ANSWER---1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the
pressure? - ANSWER---The deeper you go in water, the more the
pressure increases
Pressure is expressed as the weight of air
What is the relationship between pressure, and the volume and the
density of air? - ANSWER---As pressure increases, the gas volume
decreases and the gas density increases
If I take a volume of air from one depth to another depth, how much
will the volume and density change? - ANSWER---Volume will be
1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I
descend? - ANSWER---Ears, sinuses, mask
What is a "squeeze"? - ANSWER---The discomfort caused by pressure
imbalance pulling tissue into the air space
, ADCI Surface Supplied Mixed Gas Diver
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales 2026
What is "equalization"? - ANSWER---The addition of air to your air
spaces as you descend
How do I equalize as I descend? - ANSWER---For ears and sinuses,
pinch your nose and blow gently, or wiggle your jaw and swallow
For mask, blow into it with nose
How often should I equalize? - ANSWER---Every meter/few feet,
BEFORE you feel discomfort
What should I do if I can't equalize? - ANSWER---Stop your descent,
signal problem and point to your ear, ascend a bit, and try again
What can happen if I don't or can't equalize gently and keep
descending? - ANSWER---Fluid can rupture the eardrum
Bruising around the face can occur
Why does a congestion from a cold or allergy temporarily keep me
from diving? - ANSWER---Congestion might block normal air flow,
making equalization difficult or impossible
Why should I never dive with earplugs? - ANSWER---They create air
spaces that you can't equalize
What other body air spaces are affected by increasing pressure?
How do I equalize them? - ANSWER---In filled teeth - go to a dentist
, ADCI Surface Supplied Mixed Gas Diver
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales 2026
In a dry suit - learn from an instructor
Lungs - breathe normally and continuously
What is the most important rule in scuba diving? - ANSWER---
Breathe continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba
diving? - ANSWER---Your lungs will over expand and rupture
What is a "reverse block"? - ANSWER---When expanding air becomes
trapped in your body air spaces as you ascend
What should I do if I feel discomfort in my ears, sinuses, stomach,
intestines, or teeth while ascending? - ANSWER---Stop your ascent
and descend a meter/few feet to reduce discomfort and give
trapped air time to work its way out
How does depth affect how long my air supply lasts? - ANSWER---
The deeper you are, the more dense air you breathe, and the faster
you use the air in your cylinder. Compared to the surface, air supply
lasts 1/#ata as long along with other factors
What's the most efficient way to breathe dense air underwater? -
ANSWER---Take slow, deep breaths
