PADI Open Water Exam Study Guide |Question and Answer| 100% Correct

PADI Open Water Exam Study Guide |Question and Answer| 100% Correct When is an object positively buoyant? *Ans* When it displaces a volume of water weighing more than its own weight. When is an object negatively buoyant? *Ans* When it displaces a volume of water weighing less than its own weight. When is an object neutrally buoyant? *Ans* When it displaces a volume of water weighing the same as its own weight. Why two pieces of equipment do you use to control your buoyancy? *Ans* BCD, Lead weight What does buoyancy help with when you are underwater? *Ans* Controlling where you are What does buoyancy help with when you are at the surface? *Ans* Floatation, conserving energy How does the buoyancy of an object differ in fresh/salt water? *Ans* More buoyant in salt than fresh When you exhale what happens? *Ans* Lung volume decreases so you have less buoyancy. When you inhale what happens? *Ans* Lung volume increases so you have more buoyancy. Why don't you feel air pressure? *Ans* Your body is primarily liquid, which is incompressible and distribute pressure equally throughout your whole body. Where are some air spaces located in the body? *Ans* Ears, sinuses, lungs Do you always feel the pressure in body air spaces? *Ans* Only if the pressure is different inside and outside the air spaces. 1 bar is what depth? *Ans* 0m/0ft 2 bar is what depth? *Ans* 33ft/10m 3 bar is what depth? *Ans* 66ft/20m 4 bar is what depth? *Ans* 99ft/30m How is air volume affected when depth is increased? *Ans* It decreases How is air density affected when depth is increased? *Ans* It increases What happens if you take an air volume underwater with you in a flexible container or inverted jar? *Ans* As pressure increases the volume decreases, same air but smaller space. How do you maintain air volume as you descend? *Ans* Equalize What is a "squeeze"? *Ans* As volume decreases, pressure pushes body tissues inwards toward air space, causing discomfort. Pressure outside air space is more than pressure inside air space. Where can you get a squeeze? *Ans* Ears, sinuses, mask, lungs, teeth How do you equalise air spaces in ears? *Ans* Blow and squeeze nose, wiggle jaw, swallowing How often should you equalise? *Ans* Every metre before discomfort What do you do if you feel discomfort? *Ans* Ascend until discomfort eases, equalis