Which of the following is an essential feature to consider when selecting a diving mask?
a) Purge valve.
b) High internal volume.
c) Tempered or safety glass.
d) Metal frame. - ANSWER c
Snorkels over 15 inches (38 centimeters) in length are not recommended primarily because:
a) They have to...
Which of the following is an essential feature to consider when selecting a diving mask?
a) Purge valve.
b) High internal volume.
c) Tempered or safety glass.
d) Metal frame. - ANSWER c
Snorkels over 15 inches (38 centimeters) in length are not recommended primarily because:
a) They have too much dead air space.
b) They are likely to become tangled.
c) They are not economical to manufacture.
d) They are top-heavy and difficult to use. - ANSWER a
When buying or renting equipment for diving, the most important consideration is:
a) Its cost.
b) Its fit on your body.
c) How recently it was developed.
d) Its durability. - ANSWER b
Three features that are common to all buoyancy control devices are:
a) An integrated weight system, bright color, inflation/deflation hose.
b) An overpressure relief valve, CO2 inflation cartridge, alternate air source.
c) An alternate air source, low pressure inflator, overpressure relief valve.
d) An overpressure relief valve, inflation/deflation hose, low pressure inflator hose. - ANSWER d
The _________ line is the direction of travel line on the compass.
, a) index/tick mark
b) lubber
c) degree
d) descent - ANSWER b
The dive knife is used primarily as a _________ for digging, cutting, pounding and prying.
a) weapon b) file
c) tool
d) measure - ANSWER c
Atmospheric pressure at sea level is:
a) 29.4 pounds per square inch/ 2.0 atmospheres absolute (2.03 bar).
b) 14.7 pounds per square inch/1.0 atmosphere absolute (1.01 bar).
c) 44.1 pounds per square inch/ 3.0 atmospheres absolute (3.04 bar).
d) 58.8 pounds per square inch/ 4.0 atmospheres absolute (4.05 bar). - ANSWER b
A sealed balloon filled with air that has a volume of 4 liters at 99 feet of seawater (30.2 m) will have a
volume of ____________ at 33 feet of seawater (10.1 m).
a) 2 liters.
b) 12 liters.
c) 8 liters.
d) 16 liters. - ANSWER c
The weight of freshwater is:
a) 84.0 pounds per cubic foot (1345 kg/m3).
b) 52.4 pounds per cubic foot (839 kg/m3).
c) 62.4 pounds per cubic foot (1000 kg/m3).
d) 64.0 pounds per cubic foot (1025 kg/m3). - ANSWER c
, Air, the gas most commonly used by recreational scuba divers, is composed of:
a) 81% nitrogen, 19% oxygen, trace gasses.
b) 68% nitrogen, 32% oxygen, trace gasses.
c) 78% nitrogen, 21% oxygen, trace gasses.
d) 64% nitrogen, 36% oxygen, trace gasses. - ANSWER c
Which of the following causes objects to appear larger and closer when looking through a mask during a
dive?
a) reflection
b) dispersion
c) absorption
d) refraction - ANSWER d
Sound travels approximately how many times faster in water than in air?
a) 2.
b) 4.
c) 5.
d) 8. - ANSWER b
A diver's body heat is lost through conduction (primarily) at a rate of approximately _________ times
more rapidly than in air.
a) 10
b) 25
c) 30
d) 15 - ANSWER b
Which of the following actions should a diver take to reduce drag and therefore the amount exertion
during a dive?
a) Add weight to the weight belt or weight system after properly weighted.
b) Streamline his/her body position.
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