If an object that weighs 85 kilograms/187
pounds is neutrally buoyant in salt water, what
is the volume of water the object displaces?
a. 8.5 liters/3 cubic feet
b. 82.5 liters/2.9 cubic feet
c. 87.5 liters/3.2 cubic feet
d. 170 liters/6 cubic feet
82.5 litres
- If an object is positively buoyant in salt water,
what will happen to the object when it’s placed
in fresh water?
a. The answer cannot be determined from the
information given.
b. It will sink.
c. It will float.
d. It will be neutrally buoyant.
a. The answer cannot be determined from the
information given.
- What is the gauge pressure at 16 metres/53 feet
of fresh water?
a. 2.55 ATM/37.59 psi
b. 2.6 ATM/38.28 psi
c. 1.55 ATM/22.89 psi
d. 1.6 ATM/23.58 psi
c. 1.55 ATM/22.89 psi
- A phenomenon called “visual reversal” makes
objects viewed underwater appear ________
than they actual are.
a. closer
b. more distant
c. brighter in color
b. more distant
- A 175 kilogram/385 pound anchor that
displaces 115 litres/4 cubic feet of water lies on
the bottom in 14 metres/46 feet of salt water.
What is the minimum amount of water that
must be displaced from a lifting device to bring
the anchor to the surface?
a. 54.9 litres/2 cubic feet
b. 60 litres/2.16 cubic feet
c. 65 litres/2.34 cubic feet
a. 54.9 litres/2 cubic feet
- A diver suspected of having a lung-expansion
injury should be treated as if it’s a(n) ________
because this is the most serious lung injury.
a. mediastinal emphysema
b. pneumothorax
c. subcutaneous emphysema
d. air embolism
d. air embolism
- If a diver wears a suit with an excessively tight
neck seal or hood, he may risk unconsciousness
due to _______ . This is called _______ .
a. excessive carbon dioxide levels/shallow water
blackout
b. low carbon dioxide levels/hypocapnia
c. low oxygen levels/hypoxemia
d. reduced blood supply to the brain/carotid
sinus reflex
d. reduced blood supply to the brain/carotid
sinus reflex
- A pressure related injury is called a ________.
This type of injury can occur while diving
_________ .
a. squeeze/below 30 metres or 100 feet
b. barotrauma/during descent only
c. decompression illness/only at depth
d. barotrauma/during descent or ascent
d. barotrauma/during descent or ascent
- What substance contained within the red blood
cells aids in the transport of oxygen throughout
the system?
a. Plasma
b. Cholesterol
c. Gammaglobulin
d. Hemoglobin
d. Hemoglobin
- If a diver displays dizziness, difficulty breathing,
paralysis or unconscious almost immediately
upon surfacing from a dive, you may suspect:
a. decompression sickness.
b. a lung-expansion injury.
c. oxygen toxicity.
d. overexertion
b. a lung-expansion injury.
- The symptoms of a lung-expansion injury
tend to appear _____ while the symptoms of
decompression sickness ______ .
a. immediately after the dive/usually are slower
to occur.
b. slowly over an extended time/occur
immediately upon surfacing
c. within the first 24 hours/appear within
minutes after the dive
d. only after surfacing/usually appear at depth
a. immediately after the dive/usually are slower
to occur.
- A ____ tissue compartment model was used
to determine the no decompression limits for
the Recreational Dive Planner and the surface
interval credit table was calculated using a tissue
half-time of _____ .
a. 12/120 minutes
b. 14/60 minutes
c. 6/60 minutes
d. 14/120 minutes
b. 14/ 60 minutes
The major currents that flow in the North Pacific and North Atlantic oceans move in a ____ direction
clockwise
Using a lifting device is recommended when you want to recover an object that is more than ___ negatively buoyant
4 -7 kg
- A malfunction in a _________ regulator should result in a continuous air flow.
a. upstream valve
b. fail safe
c. environmentally sealed
d. both a and b are correct
b. fail safe
- When diving in extremely cold water, a regulator that has a(n) _________ may be protected from freezing up.
a. closed circuit design
b. environmentally sealed first stage
c. downstream valve
d. fail safe design
b. environmentally sealed first stage
- It’s recommended that a scuba tank that has fallen from a moving vehicle or been dropped from a significant height is ________ before
filling and use.
a. visually inspected
b. emptied and refilled with fresh air
c. hydrostatic/pressure tested
d. repainted
c. hydrostatic/pressure tested
- Downstream or pilot valves are most likely found in the __________ of a scuba regulators.
a. first stage
b. second stage
c. first and second stages
d. high pressure ports
b. second stage
- A ______ depth gauge will give theoretical depths rather than actual depth when diving at altitudes above 300 metres/1000 feet.
a. closed bourdon tube
b. capillary
c. open bourdon tube
d. oil filled
b. capillary
- The general guideline for handling a dive computer failure while underwater is to:
a. ascend to 5 metres/15 feet and make a long safety stop, perhaps lasting as long as your
air supply permits.
b. surface immediately and monitor yourself for sign of decompression illness.
c. continue the dive at a shallower depth using your buddy’s dive computer.
d. write down the information you recall
getting from the computer before the failure
and continue the dive at a shallower depth.
a. ascend to 5 metres/15 feet and make a long safety stop, perhaps lasting as long as your
air supply permits.
