PADI, Open Water Diver, Final Exam
Review 2024/2025 Exam Questions with
100% Correct Answers | Latest Update
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. - 🧠ANSWER ✔✔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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,See Being a Diver I - Buoyancy and Controlling Buoyancy.
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 (molecules move further apart).
B The balloon will get smaller and the air inside the balloon will be more
dense (molecules move closer together).
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. - 🧠ANSWER ✔✔B The balloon will get smaller and the air inside
the balloon will be more dense (molecules move closer together).
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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,See Being a Diver I - Water Pressure and Air Volume Effects.
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. - 🧠ANSWER ✔✔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.
See Being a Diver I - Water Pressure and Air Volume Effects.
4) If I am not able to equalize (clear) my body air spaces, it may be
because I have
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, A seasickness.
B heart disease and high blood pressure.
C a cold, allergy or another medical problem.
D anxiety. - 🧠ANSWER ✔✔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.
See Being a Diver I - The Effects of Increasing Pressure on Body Air
Spaces.
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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
Review 2024/2025 Exam Questions with
100% Correct Answers | Latest Update
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. - 🧠ANSWER ✔✔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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,See Being a Diver I - Buoyancy and Controlling Buoyancy.
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 (molecules move further apart).
B The balloon will get smaller and the air inside the balloon will be more
dense (molecules move closer together).
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. - 🧠ANSWER ✔✔B The balloon will get smaller and the air inside
the balloon will be more dense (molecules move closer together).
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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,See Being a Diver I - Water Pressure and Air Volume Effects.
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. - 🧠ANSWER ✔✔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.
See Being a Diver I - Water Pressure and Air Volume Effects.
4) If I am not able to equalize (clear) my body air spaces, it may be
because I have
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, A seasickness.
B heart disease and high blood pressure.
C a cold, allergy or another medical problem.
D anxiety. - 🧠ANSWER ✔✔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.
See Being a Diver I - The Effects of Increasing Pressure on Body Air
Spaces.
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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
