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SSI Open Water Diver Version A Newest 2025 Actual
Exam 100 Questions And Correct Detailed Answers
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If you experience pain in your ears during descent: :- answers - : Stop the descent and ascend until the pain stops Causes of panic include: A. Certain environmental conditions B. Using equipment that is unfamiliar or does not fit well C. All answers re correct D. Diving outside a divers comfort ability :- answers - : All answers are correct Underwater, the bending of light rays causes objects to appear to be: :- answers - : Closer In air at 1 at a, the partial pressure of nitrogen is _____, oxygen is _____. :- answers - : 0.79 / 0.21 ata To use a compass to navigate to a sighted object: :- answers - : Point the compass toward the object, rotate the bezel until the witness marks are over the magnetic needle, and follow the lubber line Sinus squeeze can be prevented by: :- answers - : Not diving with a cold A good diving buddy:
A. is able to help in a phases of diving and dive planning B. Is as familiar with their buddy's diving equipment as they are with their own C. All answers are correct D. Makes diving more fun :- answers - : All answers are correct The purpose of a BC is to: A. Control ascent and descent rates B. All answers are correct C. Provide surface flotation D. Maintain neutral buoyancy during the dive :- answers - : All answers are correct Gauge pressure is defined as: :- answers - : Absolute pressure minus 1 ata Residual nitrogen is defined as: :- answers - : The amount of excessive nitrogen dissolved in our blood stream and tissues after a dive When diving in Marine Protected Areas like Marine Parks, divers should: :- answers - : Respect and follow the local Marine Park regulations A dive computer keeps track of a diver's nitrogen absorption levels so that the diver can: :- answers - : Stay within the no-decompression limits on each dive The recommended max ascent rate is: :- answers - : 30 feet per minute Under the SSI Equipment Service Program, your Delivery System should be serviced and performance checked: :- answers - : Every year
The best prevention for decompression sickness is to: :- answers - : Plan your dive and dive your plan The condition in which certain colors are diminished at depth increases is called: :- answers - : Absorption Which of the following would be inappropriate treatment for a diver exhibiting symptoms of Decompression Sickness? :- answers - : Taking the victim back underwater Which of the statements concerning sound transmission underwater is incorrect?
- A: Sound will travel farther underwater then in air
- B: Divers find it difficult to locate the direction of a sound producing source
- C: Divers find it easy to talk to each other directly through water
- D: Sound travels four times faster underwater than in air :- answers - : C The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is:
- A: 2 ata
- B:1 ata
- C: 4 ata
- D: 3 ata :- answers - : A The condition in which certain colors are diminished as depth increases is called:
- A: Refraction
- B: Turbidity
- C: Diffusion
- D: Absorption :- answers - : D Earplugs:
- A: Aid equalization of the middle of the ear
- B: Protect against cold
- C: Should never be worn while diving
- D: Protect ears from squeeze :- answers - : C Gauge pressure is defined as:
- A: Hydrostatic pressure minus 1 ata
- B: The pressure at the surface
- C: The depth reading on a gauge
- D: Absolute pressure minus 1 ata :- answers - : D Sinus squeeze can be prevented by:
- A: Valsalva technique
- B: Wearing earplugs
- C: Tilting the divers head back and forth
- D: Not diving with a cold :- answers - : D The event that led to the use of the acronym SCUBA to describe diving was: Development of what and when? :- answers - : Demand regulator in 1943
- A: prevent sinus squeeze
- B: prevent ear pain
- C: prevent squeeze injuries
- D: all answers are correct :- answers - : D Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot. :- answers - : 64/62. Underwater, the bending of light rays causes objects to appear to be: :- answers - : Closer The purpose of equalization is to:
- A: ensure the uneven application of pressure between the water and air spaces in the body
- B: prevent water from entering air spaces in the body
- C: introduce additional air into body air spaces in response to increasing external pressure
- D: remove all fluids from body air spaces :- answers - : C One atmosphere of pressure is defined as
- A: 1 ata
- B: each 34ft of depth in freshwater
- C: each 33ft of depth in saltwater
- D: all answers are correct :- answers - : D The three primary features to look for in a quality Exposure System are: :- answers - : Thickness, fit, seam integrity
An object immersed in water will be buoyed upward by a force ______ to the weight of the water it displaces. :- answers - : equal A high pressure scuba cylinder should be stored:
- A: secured with a minimum of 500 to 750 psi
- B: lying flat with no air
- C: with the valve slightly open to allow air expansion
- D: secured with the valve open :- answers - : A The most efficient breathing pattern for scuba diving is: :- answers - : Deep inhale/exhale One of the primary factors contributing to heat loss for divers is:
- A: Absorption
- B: Convection
- C: Diffusion
- D: Refraction :- answers - : B The Information System components are: A: Dive Computer B: Analogue Instruments C: SSI DiveLog D: All the above :- answers - : D
During normal diving activities, divers should never exceed an ascent rate of __ feet per minute. :- answers - : 30 A scuba tank for recreational diving should be filled with:
- A: A mixture of helium and oxygen
- B: Pure, filtered compressed air or Nitrox
- C: A mixture of hydrogen and oxygen
- D: pure oxygen :- answers - : B The rate at which the body becomes saturated with nitrogen:
- A: will vary based on factors, such as depth and blood supply to a particular area of the body
- B: is always the same rate
- C: is slower at the beginning of the process and faster at the end of the process
- D: is faster t the beginning of the process and slower at the end of the process :- answers - : A Haldanes theory that the human body can withstand a 2:1 pressure difference was revised by D Workman to a nitrogen ratio of:
- A: 3:
- B: 1:
- C: 5:
- D: 1.58:1 :- answers - : D If a flexible air-filled container at 100 feet of sea water has a volume of 10 cu ft, what would be the volume if it were transported to the surface?
- A: 20 cu ft
- B: 15 cu ft
- C: 40 cu ft
- D: 30 cu ft :- answers - : C The transfer of oxygen and nitrogen into the bloodstream occurs through the walls of the:
- A: Arteries
- B: Bronchiole trees
- C: Alveoli
- D: Blood vessels :- answers - : C Which of the following would be inappropriate treatment for a diver evidencing symptoms of Decompression Sickness?
- A: Giving them pure oxygen
- B: Taking the victim back underwater
- C: Giving them CPR
- D: Treat for shock :- answers - : B The most serious lung over-expansion injury is:
- A: Arterial gas Embolism
- B: Mediastinal emphysema
- C: Pneumothorax
The term No-decompression Limit is defined as: Maximum time at _____ without having to perform a ______ decompression stop during the _____ :- answers - : depth, mandatory, ascent To use a compass to navigate to a sighted object: Point the compass toward the object, rotate the ____ until the ____ marks are over the magnetic needle, and follow the ____ line. :- answers - : bezel, witness, lubber A dive computer keeps track of a diver's nitrogen absorption levels so that the diver can:
- A: Avoid an Arterial gas Embolism
- B: Stay within the no decompression limits on each dive
- C: dive deeper than 100 feet
- D: Make decompression dives :- answers - : B You should perform a safety stop at 15 feet for 3 to 5 minutes on every dive. True False :- answers - : True What is a surface interval? The amount of ___ the diver stays ____ of the water or on the ____ _____ dives :- answers - : time, out, surface between
Residual nitrogen is defined as: :- answers - : The amount of excessive nitrogen dissolved in our blood stream and tissues after a dive Two examples of hard coral are:
- A: fire and star
- B: elkhorn and staghorn
- C: sea fan and brain
- D: all answers are correct :- answers - : B More than ___ of Earth's oxygen is produced by marine plants. :- answers - : 85% A dependent action to take in response to an out of air emergency is:
- A: an emergency buoyant ascent
- B: sharing air using the primary second stage and using the alternate air source yourself
- C: a controlled swimming ascent
- D: all answers are correct :- answers - : B The first thing you should do if you observe signs of panic in a diver at the surface is: Completely fill your __ and instruct the ______ diver to establish _____ buoyancy :- answers - : BC, panicked, postitive To achieve the SSI Advanced Open Water Diver rating, a diver is required to: :- answers - : Complete 4 Specialty Courses and log a total of 24 dives
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is:
- 2 ata
- 1 ata
- 4 ata
- 3 ata :- answers - : 2 ata The condition in which certain colors are diminished as depth increases is called:
- Refraction
- Turbidity
- Diffusion
- Absorption :- answers - : Absorption Earplugs
- Aid equalization of the middle of the ear
- Protect against cold
- Should never be worn while diving
- Protect ears from squeeze :- answers - : - Should never be worn while diving Gauge pressure is defined as:
- Hydrostatic pressure minus 1 ata
- The pressure at the surface
- The depth reading on a gauge
- Absolute pressure minus 1 ata :- answers - : - Absolute pressure minus 1 ata Sinus squeeze can be prevented by:
- Valsalva technique
- Wearing earplugs
- Tilting the divers head back and forth
- Not diving with a cold :- answers - : - Not diving with a cold The event that led to the use of the acronym SCUBA to describe diving was: :- answers - : The development of the demand regulator in 1943 Ear squeeze can be prevented by
- Relaxing
- All answers are correct
- Never diving with a cold
- rotating the jaw, swallowing or Valsalva :- answers - : - All answers are correct The first symptom of a sinus squeeze is usually:
- a dull pain deep within the head
- a sharp pain at the base of the neck
- a crushing pain high in the chest
- a sharp pain above the eyes :- answers - : - a sharp pain above the eyes If you experience pain in the ear during descent:
- Stop the descent and ascend till the pain stops
- abort the dive
- place a finger in the ear canal and gently massage the ear until the pain ceases
- continue the descent while gently exhaling into the mask :- answers - : - continue the descent while gently exhaling into the mask
The three primary features to look for in a quality Exposure System are: :- answers - : Thickness,fit, seam integrity An object immersed in water will be buoyed upward by a force ______ the weight of the water it displaces. :- answers - : equal to A high pressure scuba cylinder should be stored:
- secured with a minimum of 500 t0 750 psi
- lying flat with no air
- with the valve slightly open to allow air expansion
- secured with the valve open :- answers - : - secured with a minimum of 500 t0 750 psi The most efficient breathing pattern for scuba diving is: :- answers - : deep balanced inhalation followed by long balanced exhalation, without any pause One of the primary factors contributing to heat loss for divers is:
- Absorption
- Convection
- Diffusion
- Refraction :- answers - : - Convection The Information System components are: :- answers - : Dive Computer, Analogue Instruments, if the Dive Computer does not supply all necessary information and SSI Total DiveLog The purpose of a BC is to:
- Provide surface floatation
- Maintain neutral buoyancy during the dive
- Control ascent and descent rates
- all answers are correct :- answers - : - all answers are correct Which of the following Total Diving System subsystems best describes the SCUBA?
- Delivery system
- Buoyancy system
- Information system
- Snorkeling system :- answers - : - Delivery system Under the SSI Equipment Service Program, your Delivery System should be serviced and performance checked:
- every 3 years
- every 5 years
- every month
- every year :- answers - : - every year Assuming a consistent air consumption rate, diving at a pressure of 4 ata will use __ as much air as diving at 2 ata. :- answers - : 2 times During normal diving activities, divers should never exceed an ascent rate of __ feet per minute. :- answers - : 30 A scuba tank for recreational diving should be filled with:
- A mixture of helium and oxygen
- Pure, filtered compressed air or Nitrox
- A mixture of hydrogen and oxygen
