PADI Final Exam A Questions and Answers

If an object is neutrally buoyant (does not sink or float) in fresh water; the same object placed into salt water would: sink. Imagine you 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? The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together). 00:27 01:08 Imagine you turn a glass upside down, trap the air in it by putting it in water, and then you take the glass down to 33 feet. What would happen to the air space in the glass? The air space would become half the size it was at the surface. If you are not able to equalize (clear) your body air spaces, it may be because you have: a cold, allergy or another breathing medical problem. If you ears or sinuses hurt while you are descending (going down), it usually means: you are feeling a squeeze and need to equalize. Imagine if you held a glass upside down at 33 feet and filled it with air from your tank. What would happen to the air in the glass as you ascend (go up)? The expanding air would bubble out of the bottom of the glass. Holding your breath while scuba diving can: Cause lung injuries, push air into the blood stream and chest area, and lead to life threatening injuries. If your tank of air lasts 60 minutes while you are at the surface breathing normally, how long will it last at 66 feet breathing normally? 20 minutes How often should you take your suva tank to be visually inspected by your dive center? Once a year How can you identify a DIN tank valve from a yoke valve? The DIN valve has a threaded opening to screw the regulator into. What can you do to properly care for a scuba tank? Do not use all the air in the tank. Underwater things look ________. When you look at things underwater they often seem_______ than when you look at them on the surface. bigger, nearer