PADI Final Exam A with complete solutions

If an object is neutrally buoyant (does not sink or float) in fresh water; the same object placed into salt water would: - Answer- 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? - Answer- The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together). 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? - Answer- 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: - Answer- a cold, allergy or another breathing medical problem. If you ears or sinuses hurt while you are descending (going down), it usually means: - Answer- 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)? - Answer- The expanding air would bubble out of the bottom of the glass. Holding your breath while scuba diving can: - Answer- 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? - Answer- 20 minutes How often should you take your suva tank to be visually inspected by your dive center? - Answer- Once a year How can you identify a DIN tank valve from a yoke valve? - Answer- The DIN valve has a threaded opening to screw the regulator into. What can you do to properly care for a scuba tank? - Answer- 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. - Answer- bigger, nearer _______ travels faster in water. This is why you cannot use it to tell direction very well. - Answer- Sound How should you move under water? - Answer- Slowly and steadily If you work too hard and find it difficult to breathe underwater, you should: - Answer- stop all activity and rest, hold onto something for support, if possible. As you descend (go down) towards the bottom, you wet suit will: - Answer- compress (become smaller in thickness) from water pressure and you will lose buoyancy and warmth the deeper you go. You know you are properly weighted for diving if you: - Answer- float at eye level holding a normal breath of air with an empty BCD. If you and your buddy were separated underwater what would you generally do? - Answer- Search for a minute underwater and then go up to find your buddy. You are most likely to become confused about which way is up or down ______. This can happen because _______. - Answer- in midwater, you cannot see the surface or the bottom. Imagine you feel a mild current at the start of your dive. How should you begin the dive? - Answer- Dive against or into the current. What the bottom is made of can cause big changes in: - Answer- visibility Most injuries caused by aquatic animals happen because: - Answer- the animal is trying to protect itself. What are signs of a diver in distress (trouble) at the surface? - Answer- The diver's head is high above the water, mask is off the face and regulator is out of their mouth. The diver moves quickly and jerkily instead of slowly and calm. The diver does not respond to directions. In an out-of-air situation, while you are close to your buddy, what is the best thing to do? - Answer- switch to your buddy's alternate air source. If your regulator begins to free glow (releases lots of air at once) while underwater, you should: - Answer- Hold the regulator without sealing your mouth around the mouth-piece and "sip" the air you need as you as