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PADI OPEN WATER DIVER CERTIFICATION QUESTION BANK
FINAL EXAM 2025 COMPLETE QUESTIONS AND CORRECT
ANSWERS (100% CORRECT VERIFIED ANSWERS) WITH
RATIONALES LATEST UPDATE 2025/2026 A+ GRADED.
MULTIPLE CHOICES
1) If an object is neutrally buoyant (does not sink or float) in fresh water, the same
object placed into salt water would:
A. sink.
B. either sink or float.
C. do nothing.
D. float
D. float
Salt water is heavier than fresh water because it has dissolved minerals in it. This means it
causes more upward force (buoyancy) on an object. An object that is neutrally buoyant in
fresh water would float in salt water because there is greater upward force.
2) I blow up a balloon, tie it off, and take it to the bottom of the swimming pool. What
will happen to the balloon and the air inside it?
A. The balloon will get bigger and the air inside the balloon will be less dense
B. The balloon will get smaller and the air inside the balloon will be more dense
C. The balloon will get bigger and the air inside the balloon will be more dense.
D. The balloon will get smaller and the air inside the balloon will be less dense.
B. The balloon will get smaller and the air inside the balloon will be more dense
As water pressure increases, the volume of an air space will decrease. This causes the density
of the air inside to increase and air molecules are pushed closer together. The balloon would
get smaller and the air density inside would be greater.
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3) I turn a glass upside down, trap the air in it by putting it in water, and then I take the
glass down to 10 meters. The air space would
A. become half the size it was at the surface.
B. not change in size.
C. become 1/3 the size it was at the surface.
D. become 2/3 the size it was at the surface.
A. become half the size it was at the surface.
At 10 meters, the pressure is 2 bar. An air volume taken to this depth from the surface would
decrease and become half the size.
4) If I am not able to equalize (clear) my body air spaces, it may be because I have
A. seasickness.
B. heart disease and high blood pressure.
C. a cold, allergy or another medical problem.
D. anxiety.
C. A cold, allergy or another medical problem.
A cold, or any congestion, can block air passages in your ears and sinuses, making
equalization difficult or impossible.
5) If my ears or sinuses hurt while I am descending (going down), it usually means
A. my air spaces are equalized.
B. my mask strap is too tight.
C. I am feeling a squeeze and need to equalize.
D. my mask is too small.
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C. I am feeling a squeeze and need to equalize.
Pain in your ears or sinuses means that they aren't equalized. Stop your descent and ascend
slightly to relieve pressure on your ears. Then attempt to equalize again. If you can't equalize,
end the dive.
6) The best place for me to position an alternate air source is
A. loose by my side so I can find it fast.
B. in the triangle area formed by my chin and the lower corners of my rib cage.
C. to the base of my cylinder.
D. to the back of my BCD between my shoulder blades and waist.
B. In the triangle area formed by my chin and the lower corners of my rib cage.
Your alternate air source attaches with a quick release in the triangle area formed by your
chin and the lower corners of your rib cage. Avoid letting your alternate air source dangle
unsecured from your kit.
7) Lung over expansion injuries can be caused by
A. scuba diving without a buddy.
B. continuing a dive when not properly weighted.
C. not drinking enough water before scuba diving.
D. holding my breath while scuba diving.
D. Holding my breath while scuba diving.
Blocking off your lungs by holding your breath and ascending could cause them to
overexpand and rupture, which is a serious injury that could result in paralysis and death.
Breathing continuously while scuba diving keeps air passages open allowing expanding air to
escape.
PADI OPEN WATER DIVER CERTIFICATION QUESTION BANK
FINAL EXAM 2025 COMPLETE QUESTIONS AND CORRECT
ANSWERS (100% CORRECT VERIFIED ANSWERS) WITH
RATIONALES LATEST UPDATE 2025/2026 A+ GRADED.
MULTIPLE CHOICES
1) If an object is neutrally buoyant (does not sink or float) in fresh water, the same
object placed into salt water would:
A. sink.
B. either sink or float.
C. do nothing.
D. float
D. float
Salt water is heavier than fresh water because it has dissolved minerals in it. This means it
causes more upward force (buoyancy) on an object. An object that is neutrally buoyant in
fresh water would float in salt water because there is greater upward force.
2) I blow up a balloon, tie it off, and take it to the bottom of the swimming pool. What
will happen to the balloon and the air inside it?
A. The balloon will get bigger and the air inside the balloon will be less dense
B. The balloon will get smaller and the air inside the balloon will be more dense
C. The balloon will get bigger and the air inside the balloon will be more dense.
D. The balloon will get smaller and the air inside the balloon will be less dense.
B. The balloon will get smaller and the air inside the balloon will be more dense
As water pressure increases, the volume of an air space will decrease. This causes the density
of the air inside to increase and air molecules are pushed closer together. The balloon would
get smaller and the air density inside would be greater.
,2|Page
3) I turn a glass upside down, trap the air in it by putting it in water, and then I take the
glass down to 10 meters. The air space would
A. become half the size it was at the surface.
B. not change in size.
C. become 1/3 the size it was at the surface.
D. become 2/3 the size it was at the surface.
A. become half the size it was at the surface.
At 10 meters, the pressure is 2 bar. An air volume taken to this depth from the surface would
decrease and become half the size.
4) If I am not able to equalize (clear) my body air spaces, it may be because I have
A. seasickness.
B. heart disease and high blood pressure.
C. a cold, allergy or another medical problem.
D. anxiety.
C. A cold, allergy or another medical problem.
A cold, or any congestion, can block air passages in your ears and sinuses, making
equalization difficult or impossible.
5) If my ears or sinuses hurt while I am descending (going down), it usually means
A. my air spaces are equalized.
B. my mask strap is too tight.
C. I am feeling a squeeze and need to equalize.
D. my mask is too small.
, 3|Page
C. I am feeling a squeeze and need to equalize.
Pain in your ears or sinuses means that they aren't equalized. Stop your descent and ascend
slightly to relieve pressure on your ears. Then attempt to equalize again. If you can't equalize,
end the dive.
6) The best place for me to position an alternate air source is
A. loose by my side so I can find it fast.
B. in the triangle area formed by my chin and the lower corners of my rib cage.
C. to the base of my cylinder.
D. to the back of my BCD between my shoulder blades and waist.
B. In the triangle area formed by my chin and the lower corners of my rib cage.
Your alternate air source attaches with a quick release in the triangle area formed by your
chin and the lower corners of your rib cage. Avoid letting your alternate air source dangle
unsecured from your kit.
7) Lung over expansion injuries can be caused by
A. scuba diving without a buddy.
B. continuing a dive when not properly weighted.
C. not drinking enough water before scuba diving.
D. holding my breath while scuba diving.
D. Holding my breath while scuba diving.
Blocking off your lungs by holding your breath and ascending could cause them to
overexpand and rupture, which is a serious injury that could result in paralysis and death.
Breathing continuously while scuba diving keeps air passages open allowing expanding air to
escape.
