SSI Science of Diving Exam Questions with Complete Solutions
1. At an altitude of about 16,000 feet, the atmospheric pressure
is approxi- mately:
1/18th the atmospheric pressure at sea
level Equal to the atmospheric pressure
at sea level Twice the atmospheric
pressure at sea level
One-half the atmospheric pressure at sea level: One-half the atmospheric
pressure at sea level
2. If the volume of a gas is kept constant, what varies directly
with tempera- ture?
The pressure
All answers are
correct The mixing
The volume: The pressure
3. Our perception of light changes as it travels from the water,
through the glass of the mask, and into the air pocket in front of
the eyes. This gives a magnification factor of to the objects
we see underwater.
None
50%
100%
33%: 33%
4. Sound travels differently in water than in air. The major
difference is that it travels:
Approximately 4 times
slower Approximately 10
times faster
Approximately 2 times
faster
Approximately 4 times faster: Approximately 4 times faster
5. The absolute pressure at a depth of 165 feet in salt water is:
,5.012 ata
5.000 ata
6.000 ata
5.901 ata: 6.000 ata
,6. The greatest expansion or compression per foot happens in
which depth area?
66 to 33 ft
99 to 66 ft
First 33 ft
132 to 99 ft: First 33 ft
7. Objects do not appear the same in the underwater environment
as they do on land. Some major factors that influence this difference
in appearance are: Refraction and Absorption only
Turbidity and Diffusion only
Absorption and Diffusion
only
Refraction, Absorption, Diffusion and Turbidity: Refraction, Absorption, Diffusion
and Turbid- ity
8. The absolute pressure at a depth of 132 feet in saltwater is:
5.000 ata
4.852 ata
4.084 ata
5.012 ata: 5.000 ata
9. The ocean depth at which the partial pressure of oxygen in
air equals 1.6 ata is feet assuming O2 = 21%.
218
250
180
280: 218
10. What is the surface air consumption rate (SAC) of a diver with a
3000psi-rat- ed, 80-cubic foot cylinder, using 650psi in 10 minutes, at
a depth of 33 feet in the ocean?
34 psi/minute
28.5 psi/minute
30 psi/minute
32.5 psi/minute: 32.5 psi/minute
, 11. Breathing gas consumption:
Varies inversely with
depth Increases as depth
increases
Remains the same as depth increases
Decreases as depth increases: Increases as depth increases
12. If 0.10 cubic feet of air is needed in your buoyancy
compensator to maintain neutral buoyancy at 30 feet in the ocean,
what will happen to your buoyancy if you ascend 10 feet without
deflating?:
You will stay neutral, even if if you ascend or
descend Your positive buoyancy will increase
There will be no change in buoyancy
Your negative buoyancy will increase: Your positive buoyancy will increase
13. For every foot of depth in freshwater, pressure changes by:
0.432 psi
0.147 psi
0.445 psi
0.864 psi: 0.432 psi
14. A diver and their equipment weighs 175 lbs. and is neutrally
buoyant in salt- water. To be neutrally buoyant in freshwater, diving
with the same equipment, they must:
Remove weight
All answers are
correct Use the same
weight Add weight:
Remove weight
15. How much breathing gas does an 80 cubic foot (3000 psi-
rated) cylinder contain if the fill pressure is 2200 psi, and the
temperature remains constant?
40.4 cubic feet
53.9 cubic feet
1. At an altitude of about 16,000 feet, the atmospheric pressure
is approxi- mately:
1/18th the atmospheric pressure at sea
level Equal to the atmospheric pressure
at sea level Twice the atmospheric
pressure at sea level
One-half the atmospheric pressure at sea level: One-half the atmospheric
pressure at sea level
2. If the volume of a gas is kept constant, what varies directly
with tempera- ture?
The pressure
All answers are
correct The mixing
The volume: The pressure
3. Our perception of light changes as it travels from the water,
through the glass of the mask, and into the air pocket in front of
the eyes. This gives a magnification factor of to the objects
we see underwater.
None
50%
100%
33%: 33%
4. Sound travels differently in water than in air. The major
difference is that it travels:
Approximately 4 times
slower Approximately 10
times faster
Approximately 2 times
faster
Approximately 4 times faster: Approximately 4 times faster
5. The absolute pressure at a depth of 165 feet in salt water is:
,5.012 ata
5.000 ata
6.000 ata
5.901 ata: 6.000 ata
,6. The greatest expansion or compression per foot happens in
which depth area?
66 to 33 ft
99 to 66 ft
First 33 ft
132 to 99 ft: First 33 ft
7. Objects do not appear the same in the underwater environment
as they do on land. Some major factors that influence this difference
in appearance are: Refraction and Absorption only
Turbidity and Diffusion only
Absorption and Diffusion
only
Refraction, Absorption, Diffusion and Turbidity: Refraction, Absorption, Diffusion
and Turbid- ity
8. The absolute pressure at a depth of 132 feet in saltwater is:
5.000 ata
4.852 ata
4.084 ata
5.012 ata: 5.000 ata
9. The ocean depth at which the partial pressure of oxygen in
air equals 1.6 ata is feet assuming O2 = 21%.
218
250
180
280: 218
10. What is the surface air consumption rate (SAC) of a diver with a
3000psi-rat- ed, 80-cubic foot cylinder, using 650psi in 10 minutes, at
a depth of 33 feet in the ocean?
34 psi/minute
28.5 psi/minute
30 psi/minute
32.5 psi/minute: 32.5 psi/minute
, 11. Breathing gas consumption:
Varies inversely with
depth Increases as depth
increases
Remains the same as depth increases
Decreases as depth increases: Increases as depth increases
12. If 0.10 cubic feet of air is needed in your buoyancy
compensator to maintain neutral buoyancy at 30 feet in the ocean,
what will happen to your buoyancy if you ascend 10 feet without
deflating?:
You will stay neutral, even if if you ascend or
descend Your positive buoyancy will increase
There will be no change in buoyancy
Your negative buoyancy will increase: Your positive buoyancy will increase
13. For every foot of depth in freshwater, pressure changes by:
0.432 psi
0.147 psi
0.445 psi
0.864 psi: 0.432 psi
14. A diver and their equipment weighs 175 lbs. and is neutrally
buoyant in salt- water. To be neutrally buoyant in freshwater, diving
with the same equipment, they must:
Remove weight
All answers are
correct Use the same
weight Add weight:
Remove weight
15. How much breathing gas does an 80 cubic foot (3000 psi-
rated) cylinder contain if the fill pressure is 2200 psi, and the
temperature remains constant?
40.4 cubic feet
53.9 cubic feet
