PADI Open Water Chapter#1 Knowledge
Review Exam with Answers
True or False. An object is neutrally buoyant when it displaces an amount of water less
than its own weight. - Answer-False
Explain why buoyancy control, both on the surface and underwater, is one of the most
important skills you can master.
On the surface:
Underwater: - Answer-On the surface: To conserve energy while resting or swimming.
Underwater: To stay off the bottom and avoid crushing or damaging delicate aquatic life.
Fill in the blanks with the appropriate words: fresh water or salt water.
"The same object would be more buoyant in __________ than it would be in
__________." - Answer-"The same object would be more buoyant in salt water than it
would be in fresh water."
True or False. "Because water is much denser than air, the pressure change for a given
distance ascent or descent is significantly greater in water than in air.'' - Answer-True
Complete the following chart for a sealed flexible bag, full of air at the surface. - Answer-
0m/0ft 1 bar/ATM 1 x 1
10m/33ft 2 bar/ATM 1/2 x 2
30m/99ft 4 bar/ATM 1/4 x 4
40m/132ft 5 bar/ATM 1/5 x 5
Circle the letter of the best defi nition for a squeeze.
a. A condition that causes pain and discomfort when the pressure outside an air space
of your body is less than the pressure inside an air space.
b. A condition that causes pain and discomfort when the pressure inside an air space of
your body is less than the pressure outside an air space. - Answer-b. A condition that
causes pain and discomfort when the pressure inside an air space of your body is less
than the
pressure outside an air space.
Check each statement that describes a technique used to equalize air spaces during
descent:
a. Block your nose and attempt to gently blow through it.
b. Swallow and wiggle the jaw from side to side.
c. Block your nose and attempt to gently blow through it while swallowing and wiggling
the jaw from side to side. - Answer-a. Block your nose and attempt to gently blow
through it.
Review Exam with Answers
True or False. An object is neutrally buoyant when it displaces an amount of water less
than its own weight. - Answer-False
Explain why buoyancy control, both on the surface and underwater, is one of the most
important skills you can master.
On the surface:
Underwater: - Answer-On the surface: To conserve energy while resting or swimming.
Underwater: To stay off the bottom and avoid crushing or damaging delicate aquatic life.
Fill in the blanks with the appropriate words: fresh water or salt water.
"The same object would be more buoyant in __________ than it would be in
__________." - Answer-"The same object would be more buoyant in salt water than it
would be in fresh water."
True or False. "Because water is much denser than air, the pressure change for a given
distance ascent or descent is significantly greater in water than in air.'' - Answer-True
Complete the following chart for a sealed flexible bag, full of air at the surface. - Answer-
0m/0ft 1 bar/ATM 1 x 1
10m/33ft 2 bar/ATM 1/2 x 2
30m/99ft 4 bar/ATM 1/4 x 4
40m/132ft 5 bar/ATM 1/5 x 5
Circle the letter of the best defi nition for a squeeze.
a. A condition that causes pain and discomfort when the pressure outside an air space
of your body is less than the pressure inside an air space.
b. A condition that causes pain and discomfort when the pressure inside an air space of
your body is less than the pressure outside an air space. - Answer-b. A condition that
causes pain and discomfort when the pressure inside an air space of your body is less
than the
pressure outside an air space.
Check each statement that describes a technique used to equalize air spaces during
descent:
a. Block your nose and attempt to gently blow through it.
b. Swallow and wiggle the jaw from side to side.
c. Block your nose and attempt to gently blow through it while swallowing and wiggling
the jaw from side to side. - Answer-a. Block your nose and attempt to gently blow
through it.
