NAUI Dive Master Exam Questions With Verified Answers
Graded A+
Two cylinder valves in common use today are:☑️Correct Ans-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?☑️Correct Ans-Y valve
Which internal valve designs are available in the first stage of scuba regulators?☑️Correct Ans-
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed to operate the
valve?☑️Correct Ans-Balanced
Which regulator second stage design uses air pressure rather than mechanical leverage to open
the main valve?☑️Correct Ans-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?☑️Correct Ans-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.☑️Correct Ans-high; low
,Which diving instrument incorporates a Bourdon tube mechanism?☑️Correct Ans-Cylinder
pressure gauges
Two benefits derived from using an electronic dive computer are _____.☑️Correct Ans-
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 _____.☑️Correct Ans-
Water has most likely entered the first stage
An air compressor used for filling scuba cylinders operates by the principle of _____.☑️Correct
Ans-Boyle's Law
Dry suits form a waterproof barrier, but require undergarments to be effective in cold
water☑️Correct Ans-True
In order to make an informed decision on equipment purchase, you need to have a solid
educational background concerning the _____ of diving equipment:☑️Correct Ans-Types,
Method of operation, Care and maintenance
The distance between successive wave crests is defined as _____.☑️Correct Ans-Wavelength
The highest tides are called _____ tides, and the lowest tides are called _____ tides.☑️Correct
Ans-spring; neap
, Water rocking back and forth in a lake or a bay is defined as _____.☑️Correct Ans-Seiching
The effect of the moon on tidal action is about _____.☑️Correct Ans-Twice the effect of the
sun
The type of breaking wave that produces the greatest force when breaking is the _____
breaker.☑️Correct Ans-Plunging
If the water conditions are reasonable to make a beach dive, all of the following procedures are
suggested:☑️Correct Ans-Having your buoyancy compensator partially inflated for slight
positive buoyancy.
Being fully equipped.
Getting as close to the water's edge as possible after timing the sets and lulls to match your entry
with the smallest waves.
Entering the water as quickly as possible immediately after a wave breaks, getting beyond the
surf zone quickly, before the next wave breaks.
When waves break on shore and the backrush is funneled through a narrow opening, the
condition is known as _____.☑️Correct Ans-A rip current
Currents in bodies of water are formed by _____.☑️Correct Ans-Surface winds, The rotation of
the earth, The influence of the sun and moon
Graded A+
Two cylinder valves in common use today are:☑️Correct Ans-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?☑️Correct Ans-Y valve
Which internal valve designs are available in the first stage of scuba regulators?☑️Correct Ans-
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed to operate the
valve?☑️Correct Ans-Balanced
Which regulator second stage design uses air pressure rather than mechanical leverage to open
the main valve?☑️Correct Ans-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?☑️Correct Ans-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.☑️Correct Ans-high; low
,Which diving instrument incorporates a Bourdon tube mechanism?☑️Correct Ans-Cylinder
pressure gauges
Two benefits derived from using an electronic dive computer are _____.☑️Correct Ans-
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 _____.☑️Correct Ans-
Water has most likely entered the first stage
An air compressor used for filling scuba cylinders operates by the principle of _____.☑️Correct
Ans-Boyle's Law
Dry suits form a waterproof barrier, but require undergarments to be effective in cold
water☑️Correct Ans-True
In order to make an informed decision on equipment purchase, you need to have a solid
educational background concerning the _____ of diving equipment:☑️Correct Ans-Types,
Method of operation, Care and maintenance
The distance between successive wave crests is defined as _____.☑️Correct Ans-Wavelength
The highest tides are called _____ tides, and the lowest tides are called _____ tides.☑️Correct
Ans-spring; neap
, Water rocking back and forth in a lake or a bay is defined as _____.☑️Correct Ans-Seiching
The effect of the moon on tidal action is about _____.☑️Correct Ans-Twice the effect of the
sun
The type of breaking wave that produces the greatest force when breaking is the _____
breaker.☑️Correct Ans-Plunging
If the water conditions are reasonable to make a beach dive, all of the following procedures are
suggested:☑️Correct Ans-Having your buoyancy compensator partially inflated for slight
positive buoyancy.
Being fully equipped.
Getting as close to the water's edge as possible after timing the sets and lulls to match your entry
with the smallest waves.
Entering the water as quickly as possible immediately after a wave breaks, getting beyond the
surf zone quickly, before the next wave breaks.
When waves break on shore and the backrush is funneled through a narrow opening, the
condition is known as _____.☑️Correct Ans-A rip current
Currents in bodies of water are formed by _____.☑️Correct Ans-Surface winds, The rotation of
the earth, The influence of the sun and moon
