2025 Actual Exam from Credible Source with 120
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A _______________ exists when relatively warm, low-density surface water is
separated from cool, high-density deep water.
a. freshwater layer
b. thermocline
c. downwelling
d. rip current - CORRECT ANSWER: d. thermocline
A day after strong winds drive surface waters offshore, you notice that water conditions
become clear and cool. This is likely due to:
a. downwelling
b. extreme tides.
c. a longshore current.
d. upwelling - CORRECT ANSWER: d. upweling
A diver complains of a "wet" breathing regulator. What might be causing the problem?
,a. An exhaust valve that doesn't seal.
b. A small tear in the mouthpiece.
c. An open downstream valve.
d. Either a or b. - CORRECT ANSWER: d. Either a or b.
A diver completes a 28 minute dive at 79 feet and after waiting for 39 minutes on the
surface makes a second dive to 59 feet for 25 minutes. What is the diver's pressure
group after the second dive?
a. S
b. T
c. U
d. P - CORRECT ANSWER: ASK BROOKE
A diver suffering from hypothermia may have which of these signs and symptoms?
a. Uncontrollable shivering
b. Slowed mental processes
c. Appear drowsy, uncoordinated and forgetful
d. All of the above. - CORRECT ANSWER: d. All of the above.
A diver who takes a really long time to prepare personal equipment for a dive might be:
,a. exited about the dive.
b. busy taking care of equipment for a buddy or other divers.
c. stressed or have concerns about the dive.
d. tired or too hot. - CORRECT ANSWER: c. stressed or have concerns about the dive.
A regulator malfunctions and starts to free flow. This is due to it's _____________
design.
a. fail safe (down stream)
b. demand valve
c. balanced piston
d. open circuit - CORRECT ANSWER: a fail safe (down stream)
A regulator's first stage reduces ________________ pressure from the cylinder to
intermediate pressure and the second stage delvers air to the diver at _____________
ambient pressure.
a. high / ambient
b. air / ambient
c. ambient / high
, d. air / low - CORRECT ANSWER: a. high / ambient
Acting as a good role model:
a. Provides divers with a behavior pattern of responsible dive practices and habits of
follow.
b. Helps students by watching.
c. Gives you credibility and encourages divers to consider your suggestions.
d. All of the above. - CORRECT ANSWER: d. All of the above.
An hour after surfacing from a deep dive, a diver complains of fatigue and numbness in
one shoulder. This diver should seek medical attention because the diver may have:
a. carried equipment that was too heavy.
b. decompression illness.
c. contaminated air poisoning
d. overexertion - CORRECT ANSWER: b. decompression isllness
Approximately how much denser is the air you breathe at depth of 30 metres/ 99 feet as
compared to the surface?
a. It is equal to the surface density.