PADI, Open Water Diver, Final Exam Review with Verified Answers

) 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 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. - 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 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. - 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. - 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. - 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. - Answer-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. - Answer-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?