NAUI SCUBA DIVER PRACTICE SCRIPT
UPDATED 2026 TESTED SOLUTIONS
⫸ Which principle represents one basis for the hydrostatic testing of
scuba cylinders? Answer: permanent expansion
⫸ if a visual cylinder inspection reveals corrosion inside a scuba
cylinder, it may require cleaning by a process called Answer: tumbling
⫸ which of the following is considered proper care of a scuba cylinder?
Answer: preventing moisture from entering the cylinder
⫸ two cylinder valves in common use today are Answer: the k-valve
and din valve
⫸ which valve is an example of a special scuba valve that is required for
certain types of specialty diving such as deep diving with a single
cylinder? Answer: y valve
⫸ which internal valve designs are available in the first stage of scuba
regulators? Answer: piston; diaphragm
⫸ which valve is unaffected by cylinder air pressure with regard to the
force needed to operate the valve? Answer: balanced
,⫸ which regulator second stage design uses air pressure rather than
mechanical leverage to open the main valve? Answer: pilot
⫸ in the event of a regulator first stage malfunction, which type of valve
design would be likely to eliminate air flow to the diver? Answer:
upstream
⫸ when considering a regulator for purchase or use, an important point
to remember is that certain regulators may not be capable of delivering
____ flow rates at ____ cylinder pressure during an air sharing
emergency Answer: high; low
⫸ which diving instrument incorporates a Bourdon tube mechanism?
Answer: cylinder pressure gauges
⫸ two benefits derived from using an electronic dive computer are
Answer: accurate monitoring of ascent rate and, if executing a multi-
level diving profile, avoidance of the maximum time/depth penalty
⫸ green discoloration on the first stage of a scuba regulator indicates
Answer: water has most likely entered the first stage
⫸ an air compressor used for filling scuba cylinders operates by the
principle of Answer: Boyle's Law
, ⫸ dry suits form a waterproof barrier, but require undergarments to be
effective in cold water Answer: true
⫸ in order to make an informed decision on equipment purchase, you
need to have a solid educational background concerning the ____ of
diving equipment Answer: types, method of operation, care and
maintenance
⫸ the distance between successive wave crests is defined as Answer:
wavelength
⫸ the highest tides are called ____ tides, and the lowest tides are called
____ tides Answer: spring; neap
⫸ water rocking back and forth in a lake or a bay is defined as Answer:
seiching
⫸ the effect of the moon on tidal action is about Answer: twice the
effect of the sun
⫸ the type of breaking wave that produces the greatest force when
breaking is the _____ breaker Answer: plunging
⫸ if the water conditions are reasonable to make a beach dive, all of the
following procedures are suggested except Answer: entering the water as
UPDATED 2026 TESTED SOLUTIONS
⫸ Which principle represents one basis for the hydrostatic testing of
scuba cylinders? Answer: permanent expansion
⫸ if a visual cylinder inspection reveals corrosion inside a scuba
cylinder, it may require cleaning by a process called Answer: tumbling
⫸ which of the following is considered proper care of a scuba cylinder?
Answer: preventing moisture from entering the cylinder
⫸ two cylinder valves in common use today are Answer: the k-valve
and din valve
⫸ which valve is an example of a special scuba valve that is required for
certain types of specialty diving such as deep diving with a single
cylinder? Answer: y valve
⫸ which internal valve designs are available in the first stage of scuba
regulators? Answer: piston; diaphragm
⫸ which valve is unaffected by cylinder air pressure with regard to the
force needed to operate the valve? Answer: balanced
,⫸ which regulator second stage design uses air pressure rather than
mechanical leverage to open the main valve? Answer: pilot
⫸ in the event of a regulator first stage malfunction, which type of valve
design would be likely to eliminate air flow to the diver? Answer:
upstream
⫸ when considering a regulator for purchase or use, an important point
to remember is that certain regulators may not be capable of delivering
____ flow rates at ____ cylinder pressure during an air sharing
emergency Answer: high; low
⫸ which diving instrument incorporates a Bourdon tube mechanism?
Answer: cylinder pressure gauges
⫸ two benefits derived from using an electronic dive computer are
Answer: accurate monitoring of ascent rate and, if executing a multi-
level diving profile, avoidance of the maximum time/depth penalty
⫸ green discoloration on the first stage of a scuba regulator indicates
Answer: water has most likely entered the first stage
⫸ an air compressor used for filling scuba cylinders operates by the
principle of Answer: Boyle's Law
, ⫸ dry suits form a waterproof barrier, but require undergarments to be
effective in cold water Answer: true
⫸ in order to make an informed decision on equipment purchase, you
need to have a solid educational background concerning the ____ of
diving equipment Answer: types, method of operation, care and
maintenance
⫸ the distance between successive wave crests is defined as Answer:
wavelength
⫸ the highest tides are called ____ tides, and the lowest tides are called
____ tides Answer: spring; neap
⫸ water rocking back and forth in a lake or a bay is defined as Answer:
seiching
⫸ the effect of the moon on tidal action is about Answer: twice the
effect of the sun
⫸ the type of breaking wave that produces the greatest force when
breaking is the _____ breaker Answer: plunging
⫸ if the water conditions are reasonable to make a beach dive, all of the
following procedures are suggested except Answer: entering the water as
