PADI Open Water Diver Certification Exam Study
Guide
1) If an object is neutrally buoyant
(does not sink or float) in fresh water,
the same object placed into salt water
would
1. D float.
Salt water is heavier than fresh
water be-cause it has dissolved
minerals in it. This
means it causes more upward force (buoy- A sink.
ancy) on an object. An object that is neu- B either sink or float.
trally buoyant in fresh water would float in C do
nothing. salt water because there is greater
upward D float. force.
See Being a Diver I - Buoyancy and
Control-ling Buoyancy.
2. B The balloon will get smaller and the air 2) I blow up a balloon, tie it ott,
and take it to
inside the balloon will be more dense (mol- the bottom of the swimming pool.
What will
ecules move closer together). decrease. This causes
As water pressure increases, the
volume of an air space will
, PADI Open Water Diver Certification Exam Study
Guide
happen to the balloon and the air inside it? balloon will be less dense (mol-
A The balloon will get bigger and the air inside the
the density of the air inside to increase and ecules move further apart).
air molecules are pushed closer B The balloon will get smaller and the
together. The balloon would get air inside the balloon will be more
smaller and the air density inside dense (mol-ecules move closer
would be greater. together).
C The balloon will get bigger and the
air
See Being a Diver I - Water Pressure and Air inside the balloon will be more
dense.
Volume Effects. D The balloon will get smaller and the
air inside the balloon will be less
dense.
3. A become half the size it was at
the sur-face. 3) I turn a glass upside down, trap
the air in it by putting it in water, and
At 10 meters, the pressure is 2 bar. then I take the glass down to 10
An air volume taken to this depth meters. The air space would
from the sur-
, PADI Open Water Diver Certification Exam Study
Guide
face would decrease and become A become half the size it was at the
half the size. surface.
B not change in size.
C become 1/3 the size it was at the
surface.
See Being a Diver I - Water Pressure and Air D become 2/3 the size it was at
the surface.
Volume Effects.
4. C A cold, allergy or another medical 4) If I am not able to equalize (clear)
prob-lem. my body air spaces, it may be because
I have
A cold, or any congestion, can block
air
A seasickness.
passages in your ears and sinuses, making B heart disease and high blood
pressure.
equalization difficult or C a cold, allergy or another medical
impossible. prob-lem.
See Being a Diver I - The Effects of Increas- D anxiety.
ing Pressure on Body Air Spaces.
5. C I am feeling a squeeze and need to equal- 5) If my ears or sinuses hurt
while I am
ize. descending (going down), it usually
means
Pain in your ears or sinuses means
that they aren't equalized. Stop your A my air spaces are equalized.
descent and ascend slightly to B my mask strap is too tight.
relieve pressure on C I am feeling a squeeze and need to
equal-
your ears. Then attempt to equalize again. ize.
If you can't equalize, end the dive. See Being a Diver I -
The Effects of Increas-
, PADI Open Water Diver Certification Exam Study
Guide
ing Pressure on Body Air Spaces. D my mask is too small.
6. B In the triangle area formed by
my chin and the lower corners of
my rib cage.
6) The best place for me to position
Your alternate air source attaches an alter-nate air source is
with a quick release in the triangle
area formed by your chin and the A loose by my side so I can find it fast.
lower corners of your B in the triangle area formed by my
chin and
Guide
1) If an object is neutrally buoyant
(does not sink or float) in fresh water,
the same object placed into salt water
would
1. D float.
Salt water is heavier than fresh
water be-cause it has dissolved
minerals in it. This
means it causes more upward force (buoy- A sink.
ancy) on an object. An object that is neu- B either sink or float.
trally buoyant in fresh water would float in C do
nothing. salt water because there is greater
upward D float. force.
See Being a Diver I - Buoyancy and
Control-ling Buoyancy.
2. B The balloon will get smaller and the air 2) I blow up a balloon, tie it ott,
and take it to
inside the balloon will be more dense (mol- the bottom of the swimming pool.
What will
ecules move closer together). decrease. This causes
As water pressure increases, the
volume of an air space will
, PADI Open Water Diver Certification Exam Study
Guide
happen to the balloon and the air inside it? balloon will be less dense (mol-
A The balloon will get bigger and the air inside the
the density of the air inside to increase and ecules move further apart).
air molecules are pushed closer B The balloon will get smaller and the
together. The balloon would get air inside the balloon will be more
smaller and the air density inside dense (mol-ecules move closer
would be greater. together).
C The balloon will get bigger and the
air
See Being a Diver I - Water Pressure and Air inside the balloon will be more
dense.
Volume Effects. D The balloon will get smaller and the
air inside the balloon will be less
dense.
3. A become half the size it was at
the sur-face. 3) I turn a glass upside down, trap
the air in it by putting it in water, and
At 10 meters, the pressure is 2 bar. then I take the glass down to 10
An air volume taken to this depth meters. The air space would
from the sur-
, PADI Open Water Diver Certification Exam Study
Guide
face would decrease and become A become half the size it was at the
half the size. surface.
B not change in size.
C become 1/3 the size it was at the
surface.
See Being a Diver I - Water Pressure and Air D become 2/3 the size it was at
the surface.
Volume Effects.
4. C A cold, allergy or another medical 4) If I am not able to equalize (clear)
prob-lem. my body air spaces, it may be because
I have
A cold, or any congestion, can block
air
A seasickness.
passages in your ears and sinuses, making B heart disease and high blood
pressure.
equalization difficult or C a cold, allergy or another medical
impossible. prob-lem.
See Being a Diver I - The Effects of Increas- D anxiety.
ing Pressure on Body Air Spaces.
5. C I am feeling a squeeze and need to equal- 5) If my ears or sinuses hurt
while I am
ize. descending (going down), it usually
means
Pain in your ears or sinuses means
that they aren't equalized. Stop your A my air spaces are equalized.
descent and ascend slightly to B my mask strap is too tight.
relieve pressure on C I am feeling a squeeze and need to
equal-
your ears. Then attempt to equalize again. ize.
If you can't equalize, end the dive. See Being a Diver I -
The Effects of Increas-
, PADI Open Water Diver Certification Exam Study
Guide
ing Pressure on Body Air Spaces. D my mask is too small.
6. B In the triangle area formed by
my chin and the lower corners of
my rib cage.
6) The best place for me to position
Your alternate air source attaches an alter-nate air source is
with a quick release in the triangle
area formed by your chin and the A loose by my side so I can find it fast.
lower corners of your B in the triangle area formed by my
chin and
