SSI Open Water Diver Certification – Study Guide, Key Concepts & Practice
Questions Review
The condition in which certain colors are diminished as depth increases is called: - correct
answer ✔✔Absorption
Ear squeeze can be prevented by:
1.rotating the jaw, swallowing, or Valsalva
2. never diving with a cold
3. relaxing
4. all answers are correct - correct answer ✔✔4. all answers are correct
Sinus squeeze can be prevented by:
1. tilting the divers head back and forth
2. not diving with a cold
3. wearing earplugs
4. the Valsalva technique - correct answer ✔✔2. not diving with a cold
Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot.
1. 54/50
2. 65/68
3. 64/62.5
4. they both weigh the same - correct answer ✔✔3. 64/62.5
,The purpose of equalization is to:
1. remove all fluids from body air spaces
2. ensure the uneven application of pressure between the water and air spaces
3. prevent water from entering air spaces in the body
4. introduce additional air into body air spaces in response to increasing external pressure -
correct answer ✔✔4. introduce additional air into body air spaces in response to increasing
external pressure
Underwater, the bending of light rays causes objects to appear to be:
1. farther away
2. the same as the surface
3. at an angle consistent with the bend of the light
4. closer - correct answer ✔✔4. closer
The greatest relative pressure change in sea water takes place between ____ and ____ feet.
1. 66/99
2. 99/132
3. 33/66
4. 0/33 - correct answer ✔✔4. 0/33
The first symptom of a sinus squeeze is usually:
1. dull pain deep within the head
, 2. crushing pain high in the chest
3. sharp pain at the base of the neck
4. sharp pain or wedging sensation above the eyes - correct answer ✔✔4. sharp pain or
wedging sensation above the eyes
Which of the statements concerning sound transmission underwater is correct?
1. divers find it difficult to locate the direction of a sound producing source
2. sound travels four times faster underwater than in air
3. sound will travel farther underwater than in air
4. all answers are correct - correct answer ✔✔4. all answers are correct
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is:
1. 4 ata
2. 1 ata
3. 3 ata
4. 2 ata - correct answer ✔✔4. 2 ata
Gauge pressure is defined as:
1. the pressure at the surface
2. absolute pressure minus 1 ata
3. absolute pressure plus 1 ata
4. hyrdostatic pressure minus 1 ata - correct answer ✔✔2. absolute pressure minus 1 ata
Questions Review
The condition in which certain colors are diminished as depth increases is called: - correct
answer ✔✔Absorption
Ear squeeze can be prevented by:
1.rotating the jaw, swallowing, or Valsalva
2. never diving with a cold
3. relaxing
4. all answers are correct - correct answer ✔✔4. all answers are correct
Sinus squeeze can be prevented by:
1. tilting the divers head back and forth
2. not diving with a cold
3. wearing earplugs
4. the Valsalva technique - correct answer ✔✔2. not diving with a cold
Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot.
1. 54/50
2. 65/68
3. 64/62.5
4. they both weigh the same - correct answer ✔✔3. 64/62.5
,The purpose of equalization is to:
1. remove all fluids from body air spaces
2. ensure the uneven application of pressure between the water and air spaces
3. prevent water from entering air spaces in the body
4. introduce additional air into body air spaces in response to increasing external pressure -
correct answer ✔✔4. introduce additional air into body air spaces in response to increasing
external pressure
Underwater, the bending of light rays causes objects to appear to be:
1. farther away
2. the same as the surface
3. at an angle consistent with the bend of the light
4. closer - correct answer ✔✔4. closer
The greatest relative pressure change in sea water takes place between ____ and ____ feet.
1. 66/99
2. 99/132
3. 33/66
4. 0/33 - correct answer ✔✔4. 0/33
The first symptom of a sinus squeeze is usually:
1. dull pain deep within the head
, 2. crushing pain high in the chest
3. sharp pain at the base of the neck
4. sharp pain or wedging sensation above the eyes - correct answer ✔✔4. sharp pain or
wedging sensation above the eyes
Which of the statements concerning sound transmission underwater is correct?
1. divers find it difficult to locate the direction of a sound producing source
2. sound travels four times faster underwater than in air
3. sound will travel farther underwater than in air
4. all answers are correct - correct answer ✔✔4. all answers are correct
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is:
1. 4 ata
2. 1 ata
3. 3 ata
4. 2 ata - correct answer ✔✔4. 2 ata
Gauge pressure is defined as:
1. the pressure at the surface
2. absolute pressure minus 1 ata
3. absolute pressure plus 1 ata
4. hyrdostatic pressure minus 1 ata - correct answer ✔✔2. absolute pressure minus 1 ata
