PADI OPEN WATER FINAL EXAM A
with 100% Correct Answers Pdf
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
Rationale: Salt water is denser than fresh water, so it provides greater
buoyant support. An object that is neutrally buoyant in fresh water will
float when placed in denser salt water.
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 will be less dense
(molecules move further apart)
B) The balloon will get smaller and the air inside will be more dense
(molecules move closer together)
C) The balloon will get bigger and the air inside will be more dense
,D) The balloon will get smaller and the air inside will be less dense
Answer B) The balloon will get smaller and the air inside will be more
dense (molecules move closer together)
Rationale: As depth increases, pressure increases (Boyle's Law).
Increased pressure compresses the air, making the balloon smaller and
the air inside more dense.
3. I turn a glass upside down, trap the air in it by putting it in water, and
then take the glass down to 10 metres/33 feet. 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
Rationale: At 10 metres/33 feet, the pressure is 2 atmospheres (double
the surface pressure). According to Boyle's Law, doubling the pressure
reduces the air volume to one-half.
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
Answer C) A cold, allergy, or another medical problem
Rationale: Congestion from a cold, allergy, or similar condition can block
the airways and passages needed to equalize air spaces, 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
Answer C) I am feeling a squeeze and need to equalize
Rationale: Pain in the ears or sinuses during descent is caused by
increasing pressure creating a "squeeze." Equalizing relieves this
with 100% Correct Answers Pdf
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
Rationale: Salt water is denser than fresh water, so it provides greater
buoyant support. An object that is neutrally buoyant in fresh water will
float when placed in denser salt water.
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 will be less dense
(molecules move further apart)
B) The balloon will get smaller and the air inside will be more dense
(molecules move closer together)
C) The balloon will get bigger and the air inside will be more dense
,D) The balloon will get smaller and the air inside will be less dense
Answer B) The balloon will get smaller and the air inside will be more
dense (molecules move closer together)
Rationale: As depth increases, pressure increases (Boyle's Law).
Increased pressure compresses the air, making the balloon smaller and
the air inside more dense.
3. I turn a glass upside down, trap the air in it by putting it in water, and
then take the glass down to 10 metres/33 feet. 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
Rationale: At 10 metres/33 feet, the pressure is 2 atmospheres (double
the surface pressure). According to Boyle's Law, doubling the pressure
reduces the air volume to one-half.
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
Answer C) A cold, allergy, or another medical problem
Rationale: Congestion from a cold, allergy, or similar condition can block
the airways and passages needed to equalize air spaces, 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
Answer C) I am feeling a squeeze and need to equalize
Rationale: Pain in the ears or sinuses during descent is caused by
increasing pressure creating a "squeeze." Equalizing relieves this
