PADI Open Water Certification Exam
Questions And Answers Verified 100%
Correct
What is the pressure change for each 10 metres/33 feet of depth change? -
ANSWER -1 bar/ata
What is the relationship between pressure, and the volume and density of air? -
ANSWER -As the pressure increases - as you go deeper - a gas volume decreases
because the gas molecules get compressed. The gas density increases because all
the molecules are there, but they're packed into a smaller area.
If I take a volume of air from one depth to another depth, how much will the
volume and density change? - ANSWER -Air volume and density change
proportionately with pressure. This means if you go from the surface to 10
metres/33 feet, you double the pressure to 2 bar/ata (1 air plus 1 water), a given air
volume halves, and its density doubles. If you go to 20 metres/66 feet, the pressure
is 3 bar/ata (1 air plus 2 water). An air volume would be one-third the surface
volume, and the density would triple.
As you descend in water the pressure - ANSWER -increases
A depth change of 10 metres/33 feet causes a pressure change of - ANSWER -1
bar/ata
If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be
_____ litres. - ANSWER -2 (this is because the air volume is 1/3 of the start at this
depth)
The density of the air in the previous question would be ________ the density at
the surface. (previous question: If you take 6 litres of air from the surface to 20
metres/66 feet, the volume will be _____ litres.) - ANSWER -three times the
density at the surface
A balloon fully inflated and sealed at 10 metres/33 feet, would probably _______
during ascent to the surface. - ANSWER -burst
,What three major body air spaces does increasing pressure affect as I descend? -
ANSWER -ears, sinuses, mask
What is a "squeeze"? - ANSWER -A squeeze causes discomfort and, if not
corrected, can cause injury by pressure imbalance that pushes tissues into an air
space. This happens because there is greater pressure outside the air space than
inside it.
What is "equalization" and how do I equalize as I descend? - ANSWER -Do this
by adding air to the air spaces as you descend. This keeps their pressure equal with
the outside pressure, so they stay at their normal volume. This is called
equalization. To equalize your ears and sinuses, pinch your nose and blow gently
against it. Some people find that wiggling their jaws side to side and swallowing
also works. To equalize your mask, blow air into it through your nose as you
descend
How often should I equalize? - ANSWER -Equalize every metre/few feet, before
you feel discomfort.
What should I do if I can't equalize? What can happen if I don't or can't equalize
and keep descending? - ANSWER -If you can't equalize, stop your descent
immediately. Signal your buddy(ies) or instructor. Ascend slightly until the
discomfort passes and try again. Be patient. After you equalize, descend more
slowly, equalizing more frequently. Continuing to descend with unequalized air
spaces can lead to serious injuries (fluid in middle ear, eardrum rupture, vertigo,
bruising around the mask).
Why should I equalize gently? - ANSWER -A forceful, extended equalization can
cause serious permanent injuries to your ears and hearing
Why does congestion from a cold or allergy temporarily keep me from diving?
Why should I never dive with earplugs? - ANSWER -They can cause congestion
that might block normal air flow and may make equalization of body air passages
difficult or impossible. Using cold medications is not recommended. They can
wear off during a dive, and can cause equalization problems as you ascend
What other body air spaces are affected by increasing pressure? How do I equalize
them? - ANSWER -It's very rare, but an air space can develop in filled teeth and
cause discomfort. If it happens, stop your descent because you can't equalize this
air space. See your dentist to correct the air space; regular dental checkups help
, avoid this problem. A dry suit holds a layer of air around your body during the
dive. Increasing pressure compresses this air, but you learn to equalize this space in
the PADI Dry Suit Diver course.
As I descend, increasing pressure affects my (choose all that apply): - ANSWER -
mask, ears, sinuses
A squeeze is caused by - ANSWER -a pressure imbalance between the
surrounding pressure and an air space
Equalization is the process of - ANSWER -adding air to an air space
I should equalize - ANSWER -Before I feel pain or discomfort
I'm descending and discover I can't equalize. The first thing I would do is -
ANSWER -stop my descent and signal my buddy/the instructor
I equalize gently because an extended, forceful equalization can cause permanent
damage to my ears and hearing. - ANSWER -TRUE
On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or
allergy. I should - ANSWER -cancel the dive until I'm well
When scuba diving, normal breathing keeps your lungs equalized to the
surrounding pressure. - ANSWER -TRUE
What is the most important rule in scuba diving? - ANSWER -Breathe
continuously and never, ever hold your breath
What can happen if I don't follow the most important rule in scuba diving? -
ANSWER -If during ascent you were to hold your breath, blocking your airway,
your lungs would over expand. They would be much like a balloon filled and
sealed at depth, which expanding air would burst during ascent. Expanding air can
cause serious lung overexpansion (lung rupture) injuries. For this reason, the most
important rule in scuba diving is to breathe continuously and never, ever hold your
breath.
What is a "reverse block"? - ANSWER -A reverse block (also called a reverse
squeeze) results when expanding air becomes trapped in a body air space.
Questions And Answers Verified 100%
Correct
What is the pressure change for each 10 metres/33 feet of depth change? -
ANSWER -1 bar/ata
What is the relationship between pressure, and the volume and density of air? -
ANSWER -As the pressure increases - as you go deeper - a gas volume decreases
because the gas molecules get compressed. The gas density increases because all
the molecules are there, but they're packed into a smaller area.
If I take a volume of air from one depth to another depth, how much will the
volume and density change? - ANSWER -Air volume and density change
proportionately with pressure. This means if you go from the surface to 10
metres/33 feet, you double the pressure to 2 bar/ata (1 air plus 1 water), a given air
volume halves, and its density doubles. If you go to 20 metres/66 feet, the pressure
is 3 bar/ata (1 air plus 2 water). An air volume would be one-third the surface
volume, and the density would triple.
As you descend in water the pressure - ANSWER -increases
A depth change of 10 metres/33 feet causes a pressure change of - ANSWER -1
bar/ata
If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be
_____ litres. - ANSWER -2 (this is because the air volume is 1/3 of the start at this
depth)
The density of the air in the previous question would be ________ the density at
the surface. (previous question: If you take 6 litres of air from the surface to 20
metres/66 feet, the volume will be _____ litres.) - ANSWER -three times the
density at the surface
A balloon fully inflated and sealed at 10 metres/33 feet, would probably _______
during ascent to the surface. - ANSWER -burst
,What three major body air spaces does increasing pressure affect as I descend? -
ANSWER -ears, sinuses, mask
What is a "squeeze"? - ANSWER -A squeeze causes discomfort and, if not
corrected, can cause injury by pressure imbalance that pushes tissues into an air
space. This happens because there is greater pressure outside the air space than
inside it.
What is "equalization" and how do I equalize as I descend? - ANSWER -Do this
by adding air to the air spaces as you descend. This keeps their pressure equal with
the outside pressure, so they stay at their normal volume. This is called
equalization. To equalize your ears and sinuses, pinch your nose and blow gently
against it. Some people find that wiggling their jaws side to side and swallowing
also works. To equalize your mask, blow air into it through your nose as you
descend
How often should I equalize? - ANSWER -Equalize every metre/few feet, before
you feel discomfort.
What should I do if I can't equalize? What can happen if I don't or can't equalize
and keep descending? - ANSWER -If you can't equalize, stop your descent
immediately. Signal your buddy(ies) or instructor. Ascend slightly until the
discomfort passes and try again. Be patient. After you equalize, descend more
slowly, equalizing more frequently. Continuing to descend with unequalized air
spaces can lead to serious injuries (fluid in middle ear, eardrum rupture, vertigo,
bruising around the mask).
Why should I equalize gently? - ANSWER -A forceful, extended equalization can
cause serious permanent injuries to your ears and hearing
Why does congestion from a cold or allergy temporarily keep me from diving?
Why should I never dive with earplugs? - ANSWER -They can cause congestion
that might block normal air flow and may make equalization of body air passages
difficult or impossible. Using cold medications is not recommended. They can
wear off during a dive, and can cause equalization problems as you ascend
What other body air spaces are affected by increasing pressure? How do I equalize
them? - ANSWER -It's very rare, but an air space can develop in filled teeth and
cause discomfort. If it happens, stop your descent because you can't equalize this
air space. See your dentist to correct the air space; regular dental checkups help
, avoid this problem. A dry suit holds a layer of air around your body during the
dive. Increasing pressure compresses this air, but you learn to equalize this space in
the PADI Dry Suit Diver course.
As I descend, increasing pressure affects my (choose all that apply): - ANSWER -
mask, ears, sinuses
A squeeze is caused by - ANSWER -a pressure imbalance between the
surrounding pressure and an air space
Equalization is the process of - ANSWER -adding air to an air space
I should equalize - ANSWER -Before I feel pain or discomfort
I'm descending and discover I can't equalize. The first thing I would do is -
ANSWER -stop my descent and signal my buddy/the instructor
I equalize gently because an extended, forceful equalization can cause permanent
damage to my ears and hearing. - ANSWER -TRUE
On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or
allergy. I should - ANSWER -cancel the dive until I'm well
When scuba diving, normal breathing keeps your lungs equalized to the
surrounding pressure. - ANSWER -TRUE
What is the most important rule in scuba diving? - ANSWER -Breathe
continuously and never, ever hold your breath
What can happen if I don't follow the most important rule in scuba diving? -
ANSWER -If during ascent you were to hold your breath, blocking your airway,
your lungs would over expand. They would be much like a balloon filled and
sealed at depth, which expanding air would burst during ascent. Expanding air can
cause serious lung overexpansion (lung rupture) injuries. For this reason, the most
important rule in scuba diving is to breathe continuously and never, ever hold your
breath.
What is a "reverse block"? - ANSWER -A reverse block (also called a reverse
squeeze) results when expanding air becomes trapped in a body air space.
