Open Water Diver Section 1 Exam Quuestions and Correct Answers

Open Water Diver Section 1 Exam Quuestions and Correct Answers As you descend in water does the pressure increase, decrease, or stay the same? - Answer: increase A depth change of 10 metres/33 feet causes a pressure change of___ - Answer: 1 bar/ata If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be ___ litres - Answer: 2 The density of the air at 20 metres/66 feet would be ___ the density at the surface - Answer: three times A balloon fully inflated and sealed at 10 metres/33 feet, would probably ___ during ascent to the surface - Answer: burst What three major body air spaces does increasing pressure affect as I descend? - Answer: ears sinuses mask A squeeze is caused by___ - Answer: a pressure imbalance between the surrounding pressure and an air space Equalization is the process of___ - Answer: adding air to an air space How often should you equalize? - Answer: before you feel pain or discomfort I'm descending and discover I can't equalize. The first thing I would do is___ - Answer: stop my descent and signal my buddy/the instructor True or False: I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing - Answer: True On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. What should I do? - Answer: cancel the dive until I'm well True of False: When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure - Answer: True What is the most important rule in scuba diving? - Answer: breathe continuously and never hold your breath True or False: Failure to follow the most important rule in scuba diving can cause severe injuries, which can result in paralysis or death - Answer: True During ascent I feel discomfort in my ears. I should - Answer: stop, descend slightly and allow trapped air to work its way out What are the four breathing rules for a scuba diver? - Answer: 1. breathe continuously and never, ever, hold your breath 2. breathe slowly and deeply 3. do not allow yourself to get winded or out of breath 4. if faced with a problem, stop, then reduce anxiety by maintaining or restoring slow, deep breathing My buddy and I descend to 12 metres/40 feet. I would expect to use my air ___ at 6 metres/20 feet - Answer: faster than The most efficient way to breathe dense air underwater is to breathe___ - Answer: deeply and slowly True or False: My body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety - Answer: True True or False: Buoyancy is a force the pushes an object in water upward - Answer: True My sunglasses case falls out of my pocket into the water, but fortunately, it floats so I retrieve it. I would say my sunglasses case is ___ buoyant - Answer: positively True or False: Salt water causes more buoyancy than fresh water because it is less dense and weighs less - Answer: False Salt water causes more buoyancy because it is more dense and weighs more; buoyancy results from the weight of the water displaced To control my buoyancy, normally I will use my weight system and my___ - Answer: BCD When I descend, my buoyancy tends to___. When I ascend, it tends to___. - Answer: decrease increase Underwater, when I inhale, my buoyancy___ - Answer: increases slightly True or False: It is important to master buoyancy control because it affects almost everything I do in and underwater - Answer: True True or False: In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits - Answer: True What are the 3 overall benefits of the buddy system? - Answer: 1. practicality 2. safety 3. fun The three most important considerations in choosing scuba equipment are suitability, fit and___ - Answer: comfort True or False: Getting the service my gear needs may be a consideration when choosing equipment - Answer: True Before each use, I should ___ my equipment - Answer: inspect I need a mask because___ - Answer: my eyes must be in air to focus My mask encloses my nose so I can___ - Answer: equalize the mask True or False: From among masks that fit me, I should choose a mask that fits as far away from my face as possible - Answer: False choose a low profile that sits as close to your face as possible I want to adjust my mask so the strap rests___ - Answer: above my ears, over the crown of my head True or False: Snorkels are standard equipment for scuba diving because they allow me to breathe with my face in the water, or in rough conditions, without wasting my scuba air, especially when I have little scuba air remaining - Answer: True True or False: Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use - Answer: True When my snorkel is in my mouth the tip should be___ - Answer: over the crown of my head True or False: Fins provide a large surface area so my legs can push against water effectively - Answer: True The two basic fin styles are ___ fins - Answer: adjustable and full-foot My primary considerations while choosing fins are fit and___ - Answer: blade size True or False: To prepare adjustable fins, I should adjust the straps wearing my wet suit boots - Answer: True Identify the four systems that make up a scuba kit - Answer: regulator cylinder weight system BCD True or False: There is no real benefit to choosing the components of my scuba kit as an integrated package - Answer: False although the components are generally interchangeable, choosing your scuba kit as a package helps you best meet your preferences True or False: The LPI mechanism inflates the BCD with air from my scuba cylinder - Answer: True True or False: My BCD should have adequate capacity to easily float my equipment and me at the surface - Answer: True My BCD should fit___ - Answer: fit snugly but not restrict breathing when fully inflated My buddy is rinsing a BCD and partially fills the bladder with water. Is this consistent with recommended BCD care? - Answer: yes Identify the five components of a regulator - Answer: alternate air source SPG/computer first stage low pressure inflator hose primary second stage The most important consideration when choosing a regulator is___ - Answer: ease of breathing When choosing an alternative air source, a primary consideration involves deciding___ - Answer: between independence and simplicity True or False: My SPG is always apart of my dive computer - Answer: False your SPG may be an independent instrument or it may be integrated into your dive computer True or False: My local dive pro will usually set up my regulator components - Answer: True When setting up and wearing my kit, the alternative air source___ - Answer: secures in a triangle formed by my hips and chin True or False: Regulators need periodic overhauls, typically every year to two years - Answer: True The ___ is a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail - Answer: burst disk True or False: A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure - Answer: False a cylinder's capacity depends upon both its working pressure and its internal capacity I'm renting a scuba cylinder at a dive resort. Among the cylinders for hire, some have green and yellow bands that read "Nitrox." As a PADI Open Water Diver with no other training or instructor supervision, am I qualified to use one of these cylinders? - Answer: No I bring a cylinder aboard a dive boat in preparation for a trip out to a nearby reef. The normal procedure would be to___ - Answer: secure the cylinder in a rack scuba cylinders require pressure testing ___, and visual inspection ___ - Answer: every 2-5 years, annually I should have my scuba cylinder filled___ - Answer: only by reputable scuba air stations The most important feature in my weight system is its___ - Answer: quick release True or False: I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight - Answer: True Trim means having the right ___ of weight - Answer: distribution True or False: One reason for wearing more than one weight system is that it is sometimes easier than handling a single, heavier one - Answer: True Accessory weights___ - Answer: can help you adjust your trim