Dive Master NAUI Exam Latest Update Actual Questions
and Answers with complete solution
What pressure will a scuba cylinder with a rated working pressure of 3000 psig
(207 bar), be exposed to during a hydrostatic test?
5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba
cylinders?
Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may
require cleaning by a process called:
Tumbling
Which of the following is considered proper care of a scuba cylinder?
Preventing moisture from entering the cylinder.
Two cylinder valves in common use today are:
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?
Y valve
Which internal valve designs are available in the first stage of scuba regulators?
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed
to operate the valve?
Balanced
Which regulator second stage design uses air pressure rather than mechanical
leverage to open the main valve?
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?
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.
high; low
Which diving instrument incorporates a Bourdon tube mechanism?
Cylinder pressure gauges
Two benefits derived from using an electronic dive computer are _____.
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 _____.
Water has most likely entered the first stage
An air compressor used for filling scuba cylinders operates by the principle of
_____.
Boyle's Law
, Dry suits form a waterproof barrier, but require undergarments to be effective in
cold water
True
In order to make an informed decision on equipment purchase, you need to have
a solid educational background concerning the _____ of diving equipment:
Types, Method of operation, Care and maintenance
The distance between successive wave crests is defined as _____.
Wavelength
The highest tides are called _____ tides, and the lowest tides are called _____
tides.
spring; neap
Water rocking back and forth in a lake or a bay is defined as _____.
Seiching
The effect of the moon on tidal action is about _____.
Twice the effect of the sun
The type of breaking wave that produces the greatest force when breaking is the
_____ breaker.
Plunging
If the water conditions are reasonable to make a beach dive, all of the following
procedures are suggested:
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 _____.
A rip current
Currents in bodies of water are formed by _____.
Surface winds, The rotation of the earth, The influence of the sun and moon
Water of equal temperature at all levels is most likely to be found in a lake during
the _____.
Spring
The horizontal boundary between waters of differing salinity is defined as a
_____.
Halocline
The four basic plant and animal life zones in the ocean are _____.
Littoral, Planktonic, Nektonic, Benthic
A marine animal whose tissues are toxic, either in part or entirety is _____.
Poisonous
Scyphozoans, or true jellyfish, possess stinging cells within their tentacles called
_____.
Nematocysts
Which creature poses a potential threat to divers in the freshwater environment?
Alligator snapping turtle
and Answers with complete solution
What pressure will a scuba cylinder with a rated working pressure of 3000 psig
(207 bar), be exposed to during a hydrostatic test?
5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba
cylinders?
Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may
require cleaning by a process called:
Tumbling
Which of the following is considered proper care of a scuba cylinder?
Preventing moisture from entering the cylinder.
Two cylinder valves in common use today are:
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?
Y valve
Which internal valve designs are available in the first stage of scuba regulators?
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed
to operate the valve?
Balanced
Which regulator second stage design uses air pressure rather than mechanical
leverage to open the main valve?
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?
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.
high; low
Which diving instrument incorporates a Bourdon tube mechanism?
Cylinder pressure gauges
Two benefits derived from using an electronic dive computer are _____.
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 _____.
Water has most likely entered the first stage
An air compressor used for filling scuba cylinders operates by the principle of
_____.
Boyle's Law
, Dry suits form a waterproof barrier, but require undergarments to be effective in
cold water
True
In order to make an informed decision on equipment purchase, you need to have
a solid educational background concerning the _____ of diving equipment:
Types, Method of operation, Care and maintenance
The distance between successive wave crests is defined as _____.
Wavelength
The highest tides are called _____ tides, and the lowest tides are called _____
tides.
spring; neap
Water rocking back and forth in a lake or a bay is defined as _____.
Seiching
The effect of the moon on tidal action is about _____.
Twice the effect of the sun
The type of breaking wave that produces the greatest force when breaking is the
_____ breaker.
Plunging
If the water conditions are reasonable to make a beach dive, all of the following
procedures are suggested:
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 _____.
A rip current
Currents in bodies of water are formed by _____.
Surface winds, The rotation of the earth, The influence of the sun and moon
Water of equal temperature at all levels is most likely to be found in a lake during
the _____.
Spring
The horizontal boundary between waters of differing salinity is defined as a
_____.
Halocline
The four basic plant and animal life zones in the ocean are _____.
Littoral, Planktonic, Nektonic, Benthic
A marine animal whose tissues are toxic, either in part or entirety is _____.
Poisonous
Scyphozoans, or true jellyfish, possess stinging cells within their tentacles called
_____.
Nematocysts
Which creature poses a potential threat to divers in the freshwater environment?
Alligator snapping turtle
