PADI, Open Water Diver, Final Exam Review 2024

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. - 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. - 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 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. - 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. - 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. - 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. - B

7) Lung overexpansion injuries can be caused by

A scuba diving without a buddy.
B continuing a dive when not properly weighted.
C not drinking enough water before scuba diving.
D holding my breath while scuba diving. - D

8) If my cylinder of air lasts 60 minutes while I am at the surface breathing normally, assuming all else is the same, how long will it last at 20 meters breathing normally?

A 60 minutes
B 20 minutes
C 15 minutes
D 12 minutes - B

9) How often should I take my scuba cylinder to be visually inspected by my dive center?

A Once a year.
B Once every two years.
C Every six months.
D Every five years. - A

10) The difference between DIN valves and yoke valves is that DIN valves

A are made from durable plastic.
B contain a spring-operated shutoff valve that is held open by cylinder pressure.
C have an o-ring in them.
D have threaded openings to screw the regulator into. - D

11) Which of the following is part of proper care for my scuba cylinder?

A Sand and repaint it every year.
B Dry it in the sun.
C Keep some air in it.
D Have it pressure tested every month. - C

12) Refer to the regulator picture. Each regulator part has a number next to it. Please choose the correct number for the choices below.