Scuba Diving Final Exam || Questions and 100% Accurate
Answers.
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? correct answers a. positive
b. negative
c. neutral
How does the buoyancy of an object differ in fresh water compared to salt water. correct answers
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? correct
answers 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 correct answers 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? correct answers 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"? correct answers A pressure imbalance that pushes tissues into an air space.
What is "equalization"? correct answers The process of adding air to an air space.
What are the three ways you can equalize air spaces during descent? correct answers 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? correct answers Frequently
What three steps should you take if you feel discomfort in an air space while descending? correct
answers 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? correct answers to breathe continuously and
never, ever hold your breath
What are the consequences of breaking the most important rule in scuba diving? correct answers
lung overexpansion injuries
How does increasing depth affect how long your air supply lasts? correct answers it shortens it
What's the most efficient way to breathe dense air underwater? correct answers take slow, deep
breaths
When selecting scuba equipment, what are the three most important factors? correct answers
suitability, fit, and comfort
How do you prepare a new mask for use? correct answers 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? correct answers yoke and DIN
What's the difference between a DIN valve and a yoke valve? correct answers 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? correct answers 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?
correct answers 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? correct answers the make
them looker larger and/or closer
How does water affect light intensity and color? correct answers as you go deeper, it gets darker
and colors start to fade.
How does being underwater affect hearing? correct answers sound travels over longer distances
and more efficiently
How should you move underwater to compensate for the increased resistance of water? correct
answers slowly and steadily
Answers.
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? correct answers a. positive
b. negative
c. neutral
How does the buoyancy of an object differ in fresh water compared to salt water. correct answers
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? correct
answers 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 correct answers 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? correct answers 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"? correct answers A pressure imbalance that pushes tissues into an air space.
What is "equalization"? correct answers The process of adding air to an air space.
What are the three ways you can equalize air spaces during descent? correct answers 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? correct answers Frequently
What three steps should you take if you feel discomfort in an air space while descending? correct
answers 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? correct answers to breathe continuously and
never, ever hold your breath
What are the consequences of breaking the most important rule in scuba diving? correct answers
lung overexpansion injuries
How does increasing depth affect how long your air supply lasts? correct answers it shortens it
What's the most efficient way to breathe dense air underwater? correct answers take slow, deep
breaths
When selecting scuba equipment, what are the three most important factors? correct answers
suitability, fit, and comfort
How do you prepare a new mask for use? correct answers 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? correct answers yoke and DIN
What's the difference between a DIN valve and a yoke valve? correct answers 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? correct answers 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?
correct answers 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? correct answers the make
them looker larger and/or closer
How does water affect light intensity and color? correct answers as you go deeper, it gets darker
and colors start to fade.
How does being underwater affect hearing? correct answers sound travels over longer distances
and more efficiently
How should you move underwater to compensate for the increased resistance of water? correct
answers slowly and steadily
