PADI, Open Water Diver, Final Exam
Review Newest With complete solution
100% verified correct 2024/25
D float.
ii
Salt water is heavier than fresh water because it has dissolved minerals in it. This means it
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causes more upward force (buoyancy) on an object. An object that is neutrally buoyant in
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fresh water would float in salt water because there is greater upward force.
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See Being a Diver I - Buoyancy and Controlling Buoyancy. - 1) If an object is neutrally
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buoyant (does not sink or float) in fresh water, the same object placed into salt water would
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A sink.
ii
B either sink or float.
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C do nothing.
ii ii
D float.
ii
B The balloon will get smaller and the air inside the balloon will be more dense (molecules
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move closer together).
ii ii ii
As water pressure increases, the volume of an air space will decrease. This causes the
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density of the air inside to increase and air molecules are pushed closer together. The
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balloon would get smaller and the air density inside would be greater.
ii ii ii ii ii ii ii ii ii ii ii ii ii
See Being a Diver I - Water Pressure and Air Volume Effects. - 2) I blow up a balloon, tie it
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off, and take it to the bottom of the swimming pool. What will happen to the balloon and the
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air inside it?
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A The balloon will get bigger and the air inside the balloon will be less dense (molecules
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move further apart).
ii ii ii
B The balloon will get smaller and the air inside the balloon will be more dense (molecules
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
move closer together).
ii ii ii
C The balloon will get bigger and the air inside the balloon will be more dense.
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D The balloon will get smaller and the air inside the balloon will be less dense.
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ii A become half the size it was at the surface.
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At 10 meters, the pressure is 2 bar. An air volume taken to this depth from the surface
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would decrease and become half the size.
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,See Being a Diver I - Water Pressure and Air Volume Effects. - 3) I turn a glass upside
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down, trap the air in it by putting it in water, and then I take the glass down to 10 meters.
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The air space would
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A become half the size it was at the surface.
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B not change in size.
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C become 1/3 the size it was at the surface.
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D become 2/3 the size it was at the surface.
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ii C A cold, allergy or another medical problem.
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A cold, or any congestion, can block air passages in your ears and sinuses, making
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equalization difficult or impossible.
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See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces. - 4) If I am
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not able to equalize (clear) my body air spaces, it may be because I have
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A seasickness.
ii
B heart disease and high blood pressure.
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C a cold, allergy or another medical problem.
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D anxiety.
ii
ii C I am feeling a squeeze and need to equalize.
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Pain in your ears or sinuses means that they aren't equalized. Stop your descent and
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ascend slightly to relieve pressure on your ears. Then attempt to equalize again. If you
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can't equalize, end the dive.
ii ii ii ii ii ii
See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces. - 5) If my
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ears or sinuses hurt while I am descending (going down), it usually means
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A my air spaces are equalized.
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B my mask strap is too tight.
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C I am feeling a squeeze and need to equalize.
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D my mask is too small.
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ii B In the triangle area formed by my chin and the lower corners of my rib cage.
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Your alternate air source attaches with a quick release in the triangle area formed by your
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chin and the lower corners of your rib cage. Avoid letting your alternate air source dangle
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unsecured from your kit.
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See Equipment I - Regulators. - 6) The best place for me to position an alternate air source
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is
ii
ii
A loose by my side so I can find it fast.
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B in the triangle area formed by my chin and the lower corners of my rib cage.
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, C to the base of my cylinder.
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D to the back of my BCD between my shoulder blades and waist.
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ii D Holding my breath while scuba diving.
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Blocking off your lungs by holding your breath and ascending could cause them to
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overexpand and rupture, which is a serious injury that could result in paralysis and death.
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Breathing continuously while scuba diving keeps air passages open allowing expanding
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air to escape.
ii ii ii ii
See Being a Diver I - The Effects of Decreasing Pressure on Body Air Spaces. - 7) Lung
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overexpansion injuries can be caused by
ii
ii
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A scuba diving without a buddy.
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B continuing a dive when not properly weighted.
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C not drinking enough water before scuba diving.
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D holding my breath while scuba diving.
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ii B 20 minutes
ii ii
60/3=20
For each 10 meters we go down, we have one more atmosphere of pressure. Also,
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remember to add in the 1 atmosphere of pressure at the surface.
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So, going down to 20 meters, we will have 2 atm + 1 atm = 3 atm of pressure. - 8) If my
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cylinder of air lasts 60 minutes while I am at the surface breathing normally, assuming all
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else is the same, how long will it last at 20 meters breathing normally?
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A 60 minutes
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B 20 minutes
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C 15 minutes
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D 12 minutes
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ii A Once a year.
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Have your cylinder visually inspected annually for internal corrosion or other
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contamination/damage.
ii ii
See Equipment I - Cylinders. - 9) How often should I take my scuba cylinder to be visually
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inspected by my dive center?
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A Once a year.
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B Once every two years.
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C Every six months.
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D Every five years.
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Review Newest With complete solution
100% verified correct 2024/25
D float.
ii
Salt water is heavier than fresh water because it has dissolved minerals in it. This means it
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
causes more upward force (buoyancy) on an object. An object that is neutrally buoyant in
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
fresh water would float in salt water because there is greater upward force.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
See Being a Diver I - Buoyancy and Controlling Buoyancy. - 1) If an object is neutrally
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
buoyant (does not sink or float) in fresh water, the same object placed into salt water would
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
A sink.
ii
B either sink or float.
ii ii ii ii
C do nothing.
ii ii
D float.
ii
B The balloon will get smaller and the air inside the balloon will be more dense (molecules
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
move closer together).
ii ii ii
As water pressure increases, the volume of an air space will decrease. This causes the
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
density of the air inside to increase and air molecules are pushed closer together. The
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
balloon would get smaller and the air density inside would be greater.
ii ii ii ii ii ii ii ii ii ii ii ii ii
See Being a Diver I - Water Pressure and Air Volume Effects. - 2) I blow up a balloon, tie it
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
off, and take it to the bottom of the swimming pool. What will happen to the balloon and the
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
air inside it?
ii ii ii
A The balloon will get bigger and the air inside the balloon will be less dense (molecules
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
move further apart).
ii ii ii
B The balloon will get smaller and the air inside the balloon will be more dense (molecules
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
move closer together).
ii ii ii
C The balloon will get bigger and the air inside the balloon will be more dense.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
D The balloon will get smaller and the air inside the balloon will be less dense.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ii A become half the size it was at the surface.
ii ii ii ii ii ii ii ii ii
At 10 meters, the pressure is 2 bar. An air volume taken to this depth from the surface
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
would decrease and become half the size.
ii ii ii ii ii ii ii ii
,See Being a Diver I - Water Pressure and Air Volume Effects. - 3) I turn a glass upside
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
down, trap the air in it by putting it in water, and then I take the glass down to 10 meters.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
The air space would
ii ii ii ii
A become half the size it was at the surface.
ii ii ii ii ii ii ii ii ii
B not change in size.
ii ii ii ii
C become 1/3 the size it was at the surface.
ii ii ii ii ii ii ii ii ii
D become 2/3 the size it was at the surface.
ii ii ii ii ii ii ii ii ii
ii C A cold, allergy or another medical problem.
ii ii ii ii ii ii ii
A cold, or any congestion, can block air passages in your ears and sinuses, making
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
equalization difficult or impossible.
ii ii ii ii ii
See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces. - 4) If I am
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
not able to equalize (clear) my body air spaces, it may be because I have
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
A seasickness.
ii
B heart disease and high blood pressure.
ii ii ii ii ii ii
C a cold, allergy or another medical problem.
ii ii ii ii ii ii ii
D anxiety.
ii
ii C I am feeling a squeeze and need to equalize.
ii ii ii ii ii ii ii ii ii
Pain in your ears or sinuses means that they aren't equalized. Stop your descent and
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ascend slightly to relieve pressure on your ears. Then attempt to equalize again. If you
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
can't equalize, end the dive.
ii ii ii ii ii ii
See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces. - 5) If my
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
ears or sinuses hurt while I am descending (going down), it usually means
ii ii ii ii ii ii ii ii ii ii ii ii ii
A my air spaces are equalized.
ii ii ii ii ii
B my mask strap is too tight.
ii ii ii ii ii ii
C I am feeling a squeeze and need to equalize.
ii ii ii ii ii ii ii ii ii
D my mask is too small.
ii ii ii ii ii
ii B In the triangle area formed by my chin and the lower corners of my rib cage.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Your alternate air source attaches with a quick release in the triangle area formed by your
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
chin and the lower corners of your rib cage. Avoid letting your alternate air source dangle
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
unsecured from your kit.
ii ii ii ii ii
See Equipment I - Regulators. - 6) The best place for me to position an alternate air source
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
is
ii
ii
A loose by my side so I can find it fast.
ii ii ii ii ii ii ii ii ii ii
B in the triangle area formed by my chin and the lower corners of my rib cage.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
, C to the base of my cylinder.
ii ii ii ii ii ii
D to the back of my BCD between my shoulder blades and waist.
ii ii ii ii ii ii ii ii ii ii ii ii
ii D Holding my breath while scuba diving.
ii ii ii ii ii ii
Blocking off your lungs by holding your breath and ascending could cause them to
ii ii ii ii ii ii ii ii ii ii ii ii ii
overexpand and rupture, which is a serious injury that could result in paralysis and death.
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Breathing continuously while scuba diving keeps air passages open allowing expanding
ii ii ii ii ii ii ii ii ii ii ii
air to escape.
ii ii ii ii
See Being a Diver I - The Effects of Decreasing Pressure on Body Air Spaces. - 7) Lung
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
overexpansion injuries can be caused by
ii
ii
ii ii ii ii ii
A scuba diving without a buddy.
ii ii ii ii ii
B continuing a dive when not properly weighted.
ii ii ii ii ii ii ii
C not drinking enough water before scuba diving.
ii ii ii ii ii ii ii
D holding my breath while scuba diving.
ii ii ii ii ii ii
ii B 20 minutes
ii ii
60/3=20
For each 10 meters we go down, we have one more atmosphere of pressure. Also,
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
remember to add in the 1 atmosphere of pressure at the surface.
ii ii ii ii ii ii ii ii ii ii ii ii
So, going down to 20 meters, we will have 2 atm + 1 atm = 3 atm of pressure. - 8) If my
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
cylinder of air lasts 60 minutes while I am at the surface breathing normally, assuming all
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
else is the same, how long will it last at 20 meters breathing normally?
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
A 60 minutes
ii ii
B 20 minutes
ii ii
C 15 minutes
ii ii
D 12 minutes
ii ii
ii A Once a year.
ii ii ii
Have your cylinder visually inspected annually for internal corrosion or other
ii ii ii ii ii ii ii ii ii ii
contamination/damage.
ii ii
See Equipment I - Cylinders. - 9) How often should I take my scuba cylinder to be visually
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
inspected by my dive center?
ii ii ii ii ii
A Once a year.
ii ii ii
B Once every two years.
ii ii ii ii
C Every six months.
ii ii ii
D Every five years.
ii ii ii
