PADI Open Water Diver Final Exam Review Updated Fall 2026

PADI Open Water Diver Final Exam Review Updated Fall 2026
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.
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.
See Being a Diver I - Water Pressure and Air Volume Effects.

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