The highest tides are called ____ tides, and the lowest tides are called ____
tides - ANS ✓spring; neap
Water rocking back and forth in a lake or a bay is defined as - ANS ✓seiching
The effect of the moon on tidal action is about - ANS ✓twice the effect of the
sun
The type of breaking wave that produces the greatest force when breaking
is the _____ breaker - ANS ✓plunging
If the water conditions are reasonable to make a beach dive, all of the
following procedures are suggested except - ANS ✓entering the water as
slowly 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 funnelled through a
narrow opening, the condition is known as - ANS ✓a rip current
Currents in bodies of water are formed by - ANS ✓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 - ANS ✓spring
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The horizontal boundary between waters of differing salinity is defined as a
- ANS ✓halocline
The four basic plant and animal life zones in the ocean are - ANS ✓littoral,
planktonic, nektonic, benthic
A marine animal whose tissues are toxic, either in part or entirety is - ANS
✓poisonous
Scyphozoans, or true jellyfish, possess stinging cells within their tentacles
called - ANS ✓nematocysts
Which creature poses a potential threat to divers in the freshwater
environment - ANS ✓alligator snapping turtle
Which of the following occurs when marine organisms concentrate
pollutants in their tissues through uptake by filtering, feeding, or passive
absorption - ANS ✓bioaccumulation
One way that divers can preserve the underwater environment is to - ANS
✓practice spearfishing in areas legal to do so and obey local fishing regulations
Compressed air, the gas that is primarily used by recreational divers, is
composed of - ANS ✓78.04% nitrogen, 20.94% oxygen, 0.033% carbon dioxide,
and 0.934% inert gas
Density is defined as the ____ per unit ____ of a substance - ANS ✓mass; volume
An ____ is the smallest possible unit into which matter can be divide and still
retain its unique characteristics - ANS ✓atom
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Archimedes' Principle states that: an object partially or wholly immersed in
a fluid is buoyed up by a force equal to the ____ of the ____ displaced by that
object - ANS ✓weight; fluid
What is the difference in weight between three cubic feet (85 liters) of fresh
water and the same volume of sea water? - ANS ✓4.8 pounds (2.2 kg)
A dive team wants to recover (lift) a 380 pound (172 kg)(dry weight)
anchor from the bottom of the ocean. The anchor displaces 3 cubic feet (85
liters) of sea water. The bottom composition is flat and firm. How many lift
bags, rated for 50 pounds (23 kg) of lift each, will it take to recover (lift) the
anchor? - ANS ✓4 bags
The pressure exerted by any component gas in a mixture is termed the ____
of that gas - ANS ✓partial pressure
The air (or other breathing mixture) that a diver breathes at depth is
delivered to the diver by the regulator at ____ - ANS ✓ambient pressure
Which of the following is an example of an injury explained by or attributed
to Boyle's Law? - ANS ✓equalization of air spaces, reverse blocks, lung rupture
injuries
One way that heat loss occurs during diving activity is through - ANS
✓conduction
Henry's Law states that the amount of gas that will dissolve into a solution
is _____ proportional to the partial pressure of that gas and _____ proportional
to the absolute temperature - ANS ✓directly; inversely
The absolute pressure at 75 feet (23 meters) of sea water is - ANS ✓3.27
ata/48.07 psia/3.3 bar
NAUI MASTER
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