PADI, Open Water Diver, Final Exam
Review (Latest )100% Correct
Questions & Answers
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. - Correct 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. -
Correct 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.
,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. - Correct 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
A seasickness.
B heart disease and high blood pressure.
, C a cold, allergy or another medical problem.
D anxiety. - Correct 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.
D my mask is too small. - Correct answer C I am feeling a squeeze and need to
equalize.
Review (Latest )100% Correct
Questions & Answers
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. - Correct 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. -
Correct 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.
,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. - Correct 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
A seasickness.
B heart disease and high blood pressure.
, C a cold, allergy or another medical problem.
D anxiety. - Correct 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.
D my mask is too small. - Correct answer C I am feeling a squeeze and need to
equalize.
