A reverse block refers to pain in the:
A) sinus during descent
B) ear during ascent
C) joints during ascent
D) teeth under pressure - Correct Answer - B) ear during ascent
The SCUBA diver should ascend at:
A) 60 ft/min
B) slower than 60 ft/min
C) faster than 60 ft/min
D) at any of the above rates depending on the diver and nature of
the dive - Correct Answer - B) slower than 60 ft/min
The minimum depth at which a SCUBA diver can suffer an air
embolism is approximately:
A) 5 feet
B) 8 feet
C) from 8 to 16 feet depending on the individual
D) 33 feet - Correct Answer - A) 5 feet
,Which of the following might cause a diver to in advertently
perform a breath hold ascent:
A) panic
B) dropping the regulator out of his mouth
C) lack of proper training
D) all of the above - Correct Answer - D) all of the above
You can suffer decompression sickness if you dive on SCUBA
below _____ feet:
A) 5
B) 30
C) 33
D) none of the above figures is significant - Correct Answer - B)
30
The only effective treatment for decompression sickness is:
A) to immediately return the diver to depth
B) treatment by a physician
C) to immediately administer oxygen
D) treatment in a recompression chamber - Correct Answer - D)
treatment in a recompression chamber
,Chewing gum while diving on scuba is not recommended
because:
A) you could swallow it
B) it might get stuck to the mouthpiece of your regulator
C) you risk swallowing air
D) all of the above - Correct Answer - D) all of the above
Objects underwater appear to be:
A) 1/3 larger and 1/4 closer than they actually are
B) 1/3 closer and 1/4 larger than they actually are
C) 1/3 smaller and 1/4 farther away than they actually are
D) the same size as their actual size - Correct Answer - A) 1/3
larger and 1/4 closer than they actually are
Sound waves travel approx. _____ times faster through water
than through air:
A) 5
B) 3.5
C) 4
D) 4.5 - Correct Answer - D) 4.5
The concept of specific heat explains why:
A) overweight divers are liable to suffer from heat exhaustion
B) warm air rises
, C) air is warmer than water at the same temperature
D) scientists find it necessary to use the Kelvin scale to arrive at
precise measurements of temperature - Correct Answer - C) air is
warmer than water at the same temperature
In salt water, water pressure increases _____ PSI per sq foot of
depth
A) .554
B) .445
C) .454
D) .425 - Correct Answer - B) .445
Pressure is a measurement of:
A) force per unit volume
B) density per unit area
C) density per unit volume
D) force per unit area - Correct Answer - D) force per unit area
At 132 feet of salt water, gauge pressure is:
A) 58.8 PSI
B) 73.5 PSI
C) 14.7 PSI
D) equal to absolute pressure plus 14.7 PSI - Correct Answer - A)
58.8 PSI
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