Scuba Diving Final Exam 2022 with complete solution
What will the buoyancy of an object be (positive, neutral, or negative) if it displaces an
amount of water:
a. more than its own weight?
b. less than its own weight?
c. equal to its own weight?
a. positive
b. negative
c. neutral
How does the buoyancy of an object differ in fresh water compared to salt water.
Because salt water weighs more than fresh water, it causes more buoyancy (more
upward force)
What is the relationship between increasing and decreasing depth and water pressure?
With increasing depth the water pressure increases. With decreasing depth the water
pressure decreases.
What are the absolute pressures, air volume, and air density in atmospheres, for:
a. 10m/33ft
b. 20m/66ft
b. 30m/99ft
c. 40m/132ft
a. 2 bar/ata, 1/2, x 2
b. 3 bar/ata, 1/3, x 3
c. 4 bar/ata, 1/4, x4
d. 5 bar/ata, 1/5, x5
What is the relationship between air volume and density, and how do they vary
according to this relationship when pressure increases or decreases?
Air volume and density change proportionately with pressure. As pressure increases, air
volume decreases, and air density increases. As pressure decreases, air volume
increases, and air density decreases.
What is a "squeeze"?
A pressure imbalance that pushes tissues into an air space.
What is "equalization"?
The process of adding air to an air space.
What are the three ways you can equalize air spaces during descent?
1. pinch your nose and blow gently against it
2. wiggling your jaw side-to-side and swallowing
3. blow air into mask through your nose
How often should you equalize during descent?
Frequently
What three steps should you take if you feel discomfort in an air space while
descending?
1. stop your descent
2. signal your buddy(ies)
3. ascend slightly until the discomfort passes and try again
, What is the most important rule in scuba diving?
to breathe continuously and never, ever hold your breath
What are the consequences of breaking the most important rule in scuba diving?
lung overexpansion injuries
How does increasing depth affect how long your air supply lasts?
it shortens it
What's the most efficient way to breathe dense air underwater?
take slow, deep breaths
When selecting scuba equipment, what are the three most important factors?
suitability, fit, and comfort
How do you prepare a new mask for use?
you may need to scrub the interior of the glass with a mask cleaner. main preparation is
to adjust the strap. fit it over the crown of your head, above your ears, with a snug but
not overly tightly fit. secure the strap locking device if it has one.
What are two basic types of tank valves?
yoke and DIN
What's the difference between a DIN valve and a yoke valve?
the yoke system holds the first stage to the cylinder with a clamp system. with the DIN
system, the regulator threads into the valve.
What's the best way to keep water out of a scuba tank?
to never completely empty it and store the cylinder in a standing position.
Why do you need scuba tank visual inspections and pressure tests and how often are
they done?
to keep the maintenance of the cylinder and to know it is properly working. the visual
inspection is done annually. the pressure test is done every two to five years.
How does looking at something underwater affect its apparent size?
the make them looker larger and/or closer
How does water affect light intensity and color?
as you go deeper, it gets darker and colors start to fade.
How does being underwater affect hearing?
sound travels over longer distances and more efficiently
How should you move underwater to compensate for the increased resistance of water?
slowly and steadily
How do you breathe underwater for maximum efficiency?
slowly and deeply
what are eight symptoms of overexertion while diving?
fatigue, labored breathing, a feeling of suffocation or air starvation, weakness, anxiety,
headache, muscle cramping, and a tendency to panic
what two properties may an exposure suit lose due to increased water pressure at
depth?
buoyancy and circulation
why should you avoid an excessively tight-fitting hood?
it it is too tight, it can restrict blood flow through your neck
what's the most important feature of any weight system?
the quick release
What will the buoyancy of an object be (positive, neutral, or negative) if it displaces an
amount of water:
a. more than its own weight?
b. less than its own weight?
c. equal to its own weight?
a. positive
b. negative
c. neutral
How does the buoyancy of an object differ in fresh water compared to salt water.
Because salt water weighs more than fresh water, it causes more buoyancy (more
upward force)
What is the relationship between increasing and decreasing depth and water pressure?
With increasing depth the water pressure increases. With decreasing depth the water
pressure decreases.
What are the absolute pressures, air volume, and air density in atmospheres, for:
a. 10m/33ft
b. 20m/66ft
b. 30m/99ft
c. 40m/132ft
a. 2 bar/ata, 1/2, x 2
b. 3 bar/ata, 1/3, x 3
c. 4 bar/ata, 1/4, x4
d. 5 bar/ata, 1/5, x5
What is the relationship between air volume and density, and how do they vary
according to this relationship when pressure increases or decreases?
Air volume and density change proportionately with pressure. As pressure increases, air
volume decreases, and air density increases. As pressure decreases, air volume
increases, and air density decreases.
What is a "squeeze"?
A pressure imbalance that pushes tissues into an air space.
What is "equalization"?
The process of adding air to an air space.
What are the three ways you can equalize air spaces during descent?
1. pinch your nose and blow gently against it
2. wiggling your jaw side-to-side and swallowing
3. blow air into mask through your nose
How often should you equalize during descent?
Frequently
What three steps should you take if you feel discomfort in an air space while
descending?
1. stop your descent
2. signal your buddy(ies)
3. ascend slightly until the discomfort passes and try again
, What is the most important rule in scuba diving?
to breathe continuously and never, ever hold your breath
What are the consequences of breaking the most important rule in scuba diving?
lung overexpansion injuries
How does increasing depth affect how long your air supply lasts?
it shortens it
What's the most efficient way to breathe dense air underwater?
take slow, deep breaths
When selecting scuba equipment, what are the three most important factors?
suitability, fit, and comfort
How do you prepare a new mask for use?
you may need to scrub the interior of the glass with a mask cleaner. main preparation is
to adjust the strap. fit it over the crown of your head, above your ears, with a snug but
not overly tightly fit. secure the strap locking device if it has one.
What are two basic types of tank valves?
yoke and DIN
What's the difference between a DIN valve and a yoke valve?
the yoke system holds the first stage to the cylinder with a clamp system. with the DIN
system, the regulator threads into the valve.
What's the best way to keep water out of a scuba tank?
to never completely empty it and store the cylinder in a standing position.
Why do you need scuba tank visual inspections and pressure tests and how often are
they done?
to keep the maintenance of the cylinder and to know it is properly working. the visual
inspection is done annually. the pressure test is done every two to five years.
How does looking at something underwater affect its apparent size?
the make them looker larger and/or closer
How does water affect light intensity and color?
as you go deeper, it gets darker and colors start to fade.
How does being underwater affect hearing?
sound travels over longer distances and more efficiently
How should you move underwater to compensate for the increased resistance of water?
slowly and steadily
How do you breathe underwater for maximum efficiency?
slowly and deeply
what are eight symptoms of overexertion while diving?
fatigue, labored breathing, a feeling of suffocation or air starvation, weakness, anxiety,
headache, muscle cramping, and a tendency to panic
what two properties may an exposure suit lose due to increased water pressure at
depth?
buoyancy and circulation
why should you avoid an excessively tight-fitting hood?
it it is too tight, it can restrict blood flow through your neck
what's the most important feature of any weight system?
the quick release
