PADI Open Water Final Exam – Comprehensive Study Guide, Key Concepts &
Practice Questions Review
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
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
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 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. - correct answer ✔✔A
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
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
6: The best place for me to position an alternate air source is
A loose by my side so I can find it fast.
B in the triangle area formed by my chin and the lower corners of my rib cage.
C to the base of my cylinder.
D to the back of my BCD between my shoulder blades and waist. - correct answer ✔✔B
7: Lung overexpansion injuries can be caused by
A scuba diving without a buddy.
Practice Questions Review
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
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
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 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. - correct answer ✔✔A
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
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
6: The best place for me to position an alternate air source is
A loose by my side so I can find it fast.
B in the triangle area formed by my chin and the lower corners of my rib cage.
C to the base of my cylinder.
D to the back of my BCD between my shoulder blades and waist. - correct answer ✔✔B
7: Lung overexpansion injuries can be caused by
A scuba diving without a buddy.
