Scuba PADI Exam Questions And Correct
Answers (Verified Answers) 2026/2027
Charles' Law
given a constant volume, the pressure of gas varies directly with temperature
Archimedes Principle
any object wholly or partially immersed in a liquid is buoyed up by a force equal to
the weight of the liquid displaced by the object
positive buoyancy
when an object floats
neutral buoyancy
a object that stays at the same spot you put it at; it neither sinks nor floats
negative buoyancy
when an object sinks
What buoyancy does the human body have?
has density almost equal to that of water, many people are neutrally buoyant
Weight check skills
divers tend to overweight; check every time you change environments or suits;
check again at end of dive with empty tank
properties of water
20x heat loss, 800x more dense than air, light and color loss, sound 4x faster,
objects appear closer and larger
Dalton's Law
the total pressure exerted by a mix of gasses is equal to the sum of the partial
pressures, and the pp of each gas is equal to the percent of the gas in the mixture
, gas narcosis
As a diver is breathing compressed air descends, the partial pressures of gasses
increases in direct proportion to the depth; affects nervous system causing a
narcotic effect
oxygen toxicity
When breathed at high partial pressure, oxygen can produce dangerous effects
Occurs beyond the recommended 132 ft limit for recreational divers, after oxygen
partial pressure 1.4 ata
contaminated air
When breathed at high partial pressures, the physiological effects of any trace gas
are going to be amplified and can produce dangerous effects
Boyle's Law
A principle that describes the relationship between the pressure and volume of a
gas at constant temperature
Henry's Law
the amount of gas that will dissolve into a liquid at a given temperature is directly
proportional to the partial pressure of that gas
Breathing air components
78% N, 21% O
Decompression sickness
when air bubbles remain in tissue; tend to form bubbles in joints and bends
nitrogen elimination
elimination time depends on depth, time at depth, and circulatory efficiency of
diver
no decompression limit
time you can spend at a certain depth without having to make safety stops
safe direct ascent
Answers (Verified Answers) 2026/2027
Charles' Law
given a constant volume, the pressure of gas varies directly with temperature
Archimedes Principle
any object wholly or partially immersed in a liquid is buoyed up by a force equal to
the weight of the liquid displaced by the object
positive buoyancy
when an object floats
neutral buoyancy
a object that stays at the same spot you put it at; it neither sinks nor floats
negative buoyancy
when an object sinks
What buoyancy does the human body have?
has density almost equal to that of water, many people are neutrally buoyant
Weight check skills
divers tend to overweight; check every time you change environments or suits;
check again at end of dive with empty tank
properties of water
20x heat loss, 800x more dense than air, light and color loss, sound 4x faster,
objects appear closer and larger
Dalton's Law
the total pressure exerted by a mix of gasses is equal to the sum of the partial
pressures, and the pp of each gas is equal to the percent of the gas in the mixture
, gas narcosis
As a diver is breathing compressed air descends, the partial pressures of gasses
increases in direct proportion to the depth; affects nervous system causing a
narcotic effect
oxygen toxicity
When breathed at high partial pressure, oxygen can produce dangerous effects
Occurs beyond the recommended 132 ft limit for recreational divers, after oxygen
partial pressure 1.4 ata
contaminated air
When breathed at high partial pressures, the physiological effects of any trace gas
are going to be amplified and can produce dangerous effects
Boyle's Law
A principle that describes the relationship between the pressure and volume of a
gas at constant temperature
Henry's Law
the amount of gas that will dissolve into a liquid at a given temperature is directly
proportional to the partial pressure of that gas
Breathing air components
78% N, 21% O
Decompression sickness
when air bubbles remain in tissue; tend to form bubbles in joints and bends
nitrogen elimination
elimination time depends on depth, time at depth, and circulatory efficiency of
diver
no decompression limit
time you can spend at a certain depth without having to make safety stops
safe direct ascent
