PADI Open Water Dive Course Knowledge
Reviews 1-5 Exam With Complete Solution
Knowledge review 1 - ANSWER-
At 10 metres/33 feet you're _____ bar/ata of total pressure and the air density is ___
times as great as at the surface.
a. 1
b. 2
c. 3
d. 4 - ANSWER-b. 2
*Pressure increases by one bar/ata for every 10 metres/33 feet of depth. So, at 10
metres/33 feet, the total pressure is 2 bar/ata (one from water pressure and one from
atmospheric pressure). Density increases proportionally, so at 2 bar/ata the density is 2
times as great, at 3 bar/ata the density is 3 times as great, etc.
As I descend, I need to equalize air spaces. Which of the following are accepted ways
of equalizing my ears? (choose all that apply)
a. Block my nose and attempt to gently blow through it.
b. Swallow and wiggle the jaw from side to side.
c. Block my nose and blow forcefully for an extended period. - ANSWER-a and b
*To equalize your ears and sinuses, pinch your nose and blow gently against it. This
sends air from your throat into your ears and sinuses. Some people find that wiggling
their jaws side-to-side and swallowing also works. Do not use forceful or extended
equalizations.
During a descent, I try to equalize but discover I'm having trouble doing so. Which of the
following is correct?
a. Slow my descent, signal my buddy to slow down, and equalize more forcefully.
b. Stop my descent, signal my buddy, ascend slightly and try again.
c. Continue my descent while equalizing repeatedly.
d. Signal my buddy, ascend to the surface and start my descent over.
Submit - ANSWER-b. Stop my descent, signal my buddy, ascend slightly and try again.
*If you can't equalize, stop your descent immediately. Signal your buddy(ies) or
instructor. Ascend slightly until the discomfort passes and try again. If you still can't
equalize, stop the dive. Continuing to descend with unequalized air spaces can lead to
serious injuries!
, I should equalize
a. early and often, before I feel discomfort.
b. only if I experience pain.
c. the same as - ANSWER-a. early and often, before I feel discomfort.
*Equalize every metre/few feet, before you feel discomfort. If you wait until you feel
discomfort, equalization may be difficult or impossible. When you equalize as often as
you should, you don't feel discomfort or pain.
I should not dive with a cold, nor use medications to dive with a cold.
a. True
b. False - ANSWER-a. True
*Never dive with a cold or allergy. They can cause congestion that might block normal
air flow and may make equalization difficult or impossible. Using cold medications is not
recommended. They can wear off during a dive, and can cause equalization problems
as you ascend.
The most important rule in scuba diving is:
a. Breathe continuously and never hold my breath.
b. Always dive with a buddy.
c. Keep my mask on while in the water, even at the surface.
d. Check my SPG at least every couple of minutes. - ANSWER-a. Breathe continuously
and never hold my breath.
*If during ascent you hold your breath, blocking your airway, your lungs would over
expand. Expanding air can cause serious lung overexpansion injuries. For this reason,
the most important rule in scuba diving is to breathe continuously and never, ever hold
your breath.
Failure to follow the most important rule in scuba diving can cause serious lung
overexpansion (lung rupture) injuries, which in turn can cause paralysis and death.
a. True
b. False - ANSWER-a. True
*Lung overexpansion injuries are among the worst injuries you can have in diving, and
they are difficult to treat. But, they are also easy to avoid - never hold your breath while
scuba diving.
If I feel discomfort in a body air space while ascending, the correct action is to:
a. Stop, descend slightly and give trapped air time to work its way out.
Reviews 1-5 Exam With Complete Solution
Knowledge review 1 - ANSWER-
At 10 metres/33 feet you're _____ bar/ata of total pressure and the air density is ___
times as great as at the surface.
a. 1
b. 2
c. 3
d. 4 - ANSWER-b. 2
*Pressure increases by one bar/ata for every 10 metres/33 feet of depth. So, at 10
metres/33 feet, the total pressure is 2 bar/ata (one from water pressure and one from
atmospheric pressure). Density increases proportionally, so at 2 bar/ata the density is 2
times as great, at 3 bar/ata the density is 3 times as great, etc.
As I descend, I need to equalize air spaces. Which of the following are accepted ways
of equalizing my ears? (choose all that apply)
a. Block my nose and attempt to gently blow through it.
b. Swallow and wiggle the jaw from side to side.
c. Block my nose and blow forcefully for an extended period. - ANSWER-a and b
*To equalize your ears and sinuses, pinch your nose and blow gently against it. This
sends air from your throat into your ears and sinuses. Some people find that wiggling
their jaws side-to-side and swallowing also works. Do not use forceful or extended
equalizations.
During a descent, I try to equalize but discover I'm having trouble doing so. Which of the
following is correct?
a. Slow my descent, signal my buddy to slow down, and equalize more forcefully.
b. Stop my descent, signal my buddy, ascend slightly and try again.
c. Continue my descent while equalizing repeatedly.
d. Signal my buddy, ascend to the surface and start my descent over.
Submit - ANSWER-b. Stop my descent, signal my buddy, ascend slightly and try again.
*If you can't equalize, stop your descent immediately. Signal your buddy(ies) or
instructor. Ascend slightly until the discomfort passes and try again. If you still can't
equalize, stop the dive. Continuing to descend with unequalized air spaces can lead to
serious injuries!
, I should equalize
a. early and often, before I feel discomfort.
b. only if I experience pain.
c. the same as - ANSWER-a. early and often, before I feel discomfort.
*Equalize every metre/few feet, before you feel discomfort. If you wait until you feel
discomfort, equalization may be difficult or impossible. When you equalize as often as
you should, you don't feel discomfort or pain.
I should not dive with a cold, nor use medications to dive with a cold.
a. True
b. False - ANSWER-a. True
*Never dive with a cold or allergy. They can cause congestion that might block normal
air flow and may make equalization difficult or impossible. Using cold medications is not
recommended. They can wear off during a dive, and can cause equalization problems
as you ascend.
The most important rule in scuba diving is:
a. Breathe continuously and never hold my breath.
b. Always dive with a buddy.
c. Keep my mask on while in the water, even at the surface.
d. Check my SPG at least every couple of minutes. - ANSWER-a. Breathe continuously
and never hold my breath.
*If during ascent you hold your breath, blocking your airway, your lungs would over
expand. Expanding air can cause serious lung overexpansion injuries. For this reason,
the most important rule in scuba diving is to breathe continuously and never, ever hold
your breath.
Failure to follow the most important rule in scuba diving can cause serious lung
overexpansion (lung rupture) injuries, which in turn can cause paralysis and death.
a. True
b. False - ANSWER-a. True
*Lung overexpansion injuries are among the worst injuries you can have in diving, and
they are difficult to treat. But, they are also easy to avoid - never hold your breath while
scuba diving.
If I feel discomfort in a body air space while ascending, the correct action is to:
a. Stop, descend slightly and give trapped air time to work its way out.
