Scuba Diving Final Exam Questions with Answers-Latest Update 2025
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? - Answera. positive
b. negative
c. neutral
How does the buoyancy of an object differ in fresh water compared to salt water. - AnswerBecause 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? - AnswerWith
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 - Answera. 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? - AnswerAir 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"? - AnswerA pressure imbalance that pushes tissues into an air space.
What is "equalization"? - AnswerThe process of adding air to an air space.
, What are the three ways you can equalize air spaces during descent? - Answer1. 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? - AnswerFrequently
What three steps should you take if you feel discomfort in an air space while descending? - Answer1. 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? - Answerto breathe continuously and never, ever hold your
breath
What are the consequences of breaking the most important rule in scuba diving? - Answerlung
overexpansion injuries
How does increasing depth affect how long your air supply lasts? - Answerit shortens it
What's the most efficient way to breathe dense air underwater? - Answertake slow, deep breaths
When selecting scuba equipment, what are the three most important factors? - Answersuitability, fit, and
comfort
How do you prepare a new mask for use? - Answeryou 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? - Answeryoke and DIN
What's the difference between a DIN valve and a yoke valve? - Answerthe 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? - Answerto never completely empty it and store the
cylinder in a standing position.
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? - Answera. positive
b. negative
c. neutral
How does the buoyancy of an object differ in fresh water compared to salt water. - AnswerBecause 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? - AnswerWith
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 - Answera. 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? - AnswerAir 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"? - AnswerA pressure imbalance that pushes tissues into an air space.
What is "equalization"? - AnswerThe process of adding air to an air space.
, What are the three ways you can equalize air spaces during descent? - Answer1. 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? - AnswerFrequently
What three steps should you take if you feel discomfort in an air space while descending? - Answer1. 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? - Answerto breathe continuously and never, ever hold your
breath
What are the consequences of breaking the most important rule in scuba diving? - Answerlung
overexpansion injuries
How does increasing depth affect how long your air supply lasts? - Answerit shortens it
What's the most efficient way to breathe dense air underwater? - Answertake slow, deep breaths
When selecting scuba equipment, what are the three most important factors? - Answersuitability, fit, and
comfort
How do you prepare a new mask for use? - Answeryou 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? - Answeryoke and DIN
What's the difference between a DIN valve and a yoke valve? - Answerthe 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? - Answerto never completely empty it and store the
cylinder in a standing position.
