Exam Review: SDI Certification :Questions & Answers
Describing diving with the acronym SCUBA came from what event? - ANSWER:The Demand For the
Regulator
The condition in which certain colors are diminished as depth increases is called: - ANSWER:Absorption
Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot. -
ANSWER:64/62.5
If a flexible air-filled container has a volume of 40 cu ft on the surface, what would the volume be at 99
feet in sea water? (rounded off) - ANSWER:10 cu
One atmosphere of pressure is defined as: - ANSWER:*1 ATA
*Each 34ft Depth of Fresh water
*Each 33ft Depth of Salt water
Gauge pressure is defined as: - ANSWER:absolute pressure minus 1 ATA
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is: -
ANSWER:2 ATA
Which of the statements concerning sound transmission underwater is correct? - ANSWER:*Sound will
travel farther underwater than air
*Divers find it difficult to locate the direction of a sound pronouncing source
*Sound travels four times faster underwater than in air
The greatest relative pressure change in sea water takes place between ____ and ____ feet. -
ANSWER:0/33ft
Sinus squeeze can be prevented by: - ANSWER:Not diving with a cold
Earplugs: - ANSWER:Should never be worn when diving
The first symptom of a sinus squeeze is usually: - ANSWER:A sharp pain or wedging sensation above the
eyes
If you experience pain in your ears during descent: - ANSWER:Stop the decent and ascend until the pain
stops
Absolute pressure is defined as: - ANSWER:*The total pressure exerted on an object
The purpose of equalization is to: - ANSWER:Introduce additional air into body air spaces in response to
increasing external pressure
The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water is: -
ANSWER:4 ATA
Proper equalization techniques must be learned in order to: - ANSWER:*Prevent ear pain
, *prevent sinus squeeze
*prevent squeeze injuries
Underwater, the bending of light rays causes objects to appear to be: - ANSWER:closer
During normal diving activities, divers should never exceed an ascent rate of __ feet per minute. -
ANSWER:30
The three Basic Rules of Scuba stated in the proper order of importance are: - ANSWER:Breathe
continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training
(3 B's breath, bubbles, and buddy)
An object immersed in water will be buoyed upward by a force ______ the weight of the water it
displaces. - ANSWER:equal to
A high pressure scuba cylinder should be stored: - ANSWER:secured and with a minimum of 500 to 750
psi
The most efficient breathing pattern for scuba diving is: - ANSWER:A deep balanced inhalation followed
by a long balance exhalation without any pauses between inhalation and exhalation.
A scuba cylinder must be hydrostatically tested: - ANSWER:within fixed intervals set by local laws
A scuba tank for recreational diving should be filled with: - ANSWER:pure, filtered compressed air or
nitrox
The three primary features to look for in a quality Exposure System are: - ANSWER:Thickness, fit and
seam integrity.
Which of the following Total Diving System subsystems best describes the SCUBA unit? - ANSWER:the
delivery system
The Information System components are: - ANSWER:Dive Computer, Analogue Instruments, if the Dive
Computer does not supply all necessary information and SSI Total DiveLog
The Buoyancy Control System components are: - ANSWER:Buoyancy compensator, inflation device, and
weight belt or BC weight pockets
The SSI Equipment Service Program is designed to: - ANSWER:Keep all of the components of the total
diving system to optimal performance
Which of the following factors affect a diver's air consumption rate? - ANSWER:*extreme exertion of
working heavily
*poor physical condition
*extreme stress brought on by improper response to anxiety-producing situations
One of the primary factors contributing to heat loss for divers is: - ANSWER:Convection
Assuming a consistent air consumption rate, diving at a pressure of 4 ata will use __ as much air as diving
at 2 ata. - ANSWER:2 times
Describing diving with the acronym SCUBA came from what event? - ANSWER:The Demand For the
Regulator
The condition in which certain colors are diminished as depth increases is called: - ANSWER:Absorption
Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot. -
ANSWER:64/62.5
If a flexible air-filled container has a volume of 40 cu ft on the surface, what would the volume be at 99
feet in sea water? (rounded off) - ANSWER:10 cu
One atmosphere of pressure is defined as: - ANSWER:*1 ATA
*Each 34ft Depth of Fresh water
*Each 33ft Depth of Salt water
Gauge pressure is defined as: - ANSWER:absolute pressure minus 1 ATA
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is: -
ANSWER:2 ATA
Which of the statements concerning sound transmission underwater is correct? - ANSWER:*Sound will
travel farther underwater than air
*Divers find it difficult to locate the direction of a sound pronouncing source
*Sound travels four times faster underwater than in air
The greatest relative pressure change in sea water takes place between ____ and ____ feet. -
ANSWER:0/33ft
Sinus squeeze can be prevented by: - ANSWER:Not diving with a cold
Earplugs: - ANSWER:Should never be worn when diving
The first symptom of a sinus squeeze is usually: - ANSWER:A sharp pain or wedging sensation above the
eyes
If you experience pain in your ears during descent: - ANSWER:Stop the decent and ascend until the pain
stops
Absolute pressure is defined as: - ANSWER:*The total pressure exerted on an object
The purpose of equalization is to: - ANSWER:Introduce additional air into body air spaces in response to
increasing external pressure
The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water is: -
ANSWER:4 ATA
Proper equalization techniques must be learned in order to: - ANSWER:*Prevent ear pain
, *prevent sinus squeeze
*prevent squeeze injuries
Underwater, the bending of light rays causes objects to appear to be: - ANSWER:closer
During normal diving activities, divers should never exceed an ascent rate of __ feet per minute. -
ANSWER:30
The three Basic Rules of Scuba stated in the proper order of importance are: - ANSWER:Breathe
continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training
(3 B's breath, bubbles, and buddy)
An object immersed in water will be buoyed upward by a force ______ the weight of the water it
displaces. - ANSWER:equal to
A high pressure scuba cylinder should be stored: - ANSWER:secured and with a minimum of 500 to 750
psi
The most efficient breathing pattern for scuba diving is: - ANSWER:A deep balanced inhalation followed
by a long balance exhalation without any pauses between inhalation and exhalation.
A scuba cylinder must be hydrostatically tested: - ANSWER:within fixed intervals set by local laws
A scuba tank for recreational diving should be filled with: - ANSWER:pure, filtered compressed air or
nitrox
The three primary features to look for in a quality Exposure System are: - ANSWER:Thickness, fit and
seam integrity.
Which of the following Total Diving System subsystems best describes the SCUBA unit? - ANSWER:the
delivery system
The Information System components are: - ANSWER:Dive Computer, Analogue Instruments, if the Dive
Computer does not supply all necessary information and SSI Total DiveLog
The Buoyancy Control System components are: - ANSWER:Buoyancy compensator, inflation device, and
weight belt or BC weight pockets
The SSI Equipment Service Program is designed to: - ANSWER:Keep all of the components of the total
diving system to optimal performance
Which of the following factors affect a diver's air consumption rate? - ANSWER:*extreme exertion of
working heavily
*poor physical condition
*extreme stress brought on by improper response to anxiety-producing situations
One of the primary factors contributing to heat loss for divers is: - ANSWER:Convection
Assuming a consistent air consumption rate, diving at a pressure of 4 ata will use __ as much air as diving
at 2 ata. - ANSWER:2 times
