The stage of the regulator, which reduces tank pressure, is - ANS ✓the first
stage.
Two types of materials that scuba tanks are made from our steel and - ANS
✓aluminium.
The ___________ line is the direction of travel line on the compass - ANS
✓lubber
The dive knife is used primarily as a ___________ for digging, cutting,
pounding, and prying - ANS ✓Tool
Stamped (engraved) markings on scuba tanks include - ANS ✓date of
hydrostatic test, serial number, and type of material.
Atmospheric pressure at sea level is - ANS ✓14.7 pounds per square inch/1.0
atmosphere absolute
A seal balloon filled with air that has a volume of 6 in.³ at 99 feet will have a
volume of ______ at 33 feet - ANS ✓12 in.³
Seawater weighs - ANS ✓64.0 pounds per cubic foot
NAUI SCUBA
, 2
NAUI
Which gas law best explains diving medical problems such as ear and sinus
squeeze - ANS ✓Boyles Law
Because every fraction, objects underwater appear ___________ and ______
when the diver is looking through his or her mask - ANS ✓larger; closer
When the pressure of nitrogen is balanced between the air and your body,
you are at a state of - ANS ✓equilibrium
A divers body heat is lost through conduction (primarily) at a rate of
approximately ___________ times more rapidly than an air - ANS ✓25
What type of pressure is defined as gauge (water) pressure plus
atmospheric (air) pressure - ANS ✓absolute
The absolute pressure in the ocean at 53 feet is - ANS ✓2.6 atmospheres
absolute
If a diverse surface air consumption rate is 2.5 PSI per minute, what would
be the consumption rate at 66 feet of seawater - ANS ✓75 PSI per minute
A depth that is equivalent to one atmosphere in the ocean is equal to
___________ feet in seawater and __________ feet and fresh water - ANS ✓33; 34
Two methods of measuring air pressure are BAR or - ANS ✓pounds per
square inch
Sound travels about _____ times faster in water than in air - ANS ✓4
The first color lost in the spectrum upon descent during dives is - ANS ✓red
NAUI SCUBA
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