Practice exam

Question 1

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

Answer 1

82.5 litres

Question 2

10. 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.

Answer 2

a. The answer cannot be determined from the
information given.

Question 3

11. 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

Answer 3

c. 1.55 ATM/22.89 psi

Question 4

15. A phenomenon called “visual reversal” makes
    objects viewed underwater appear ________
    than they actual are.
    a. closer
    b. more distant
    c. brighter in color

Answer 4

b. more distant

Question 5

20. 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

Answer 5

a. 54.9 litres/2 cubic feet

Question 6

10. 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

Answer 6

d. air embolism

Question 7

11. 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

Answer 7

d. reduced blood supply to the brain/carotid
sinus reflex

Question 8

12. 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

Answer 8

d. barotrauma/during descent or ascent

Question 9

16. 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

Answer 9

d. Hemoglobin

Question 10

18. 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

Answer 10

b. a lung-expansion injury.

Question 11

20. 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

Answer 11

a. immediately after the dive/usually are slower
to occur.

Question 12

3. 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

Answer 12

b. 14/ 60 minutes

Question 13

The major currents that flow in the North Pacific and North Atlantic oceans move in a ____ direction

Answer 13

clockwise

Question 14

Using a lifting device is recommended when you want to recover an object that is more than ___ negatively buoyant

Answer 14

4 -7 kg

Question 15

1. 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

Answer 15

b. fail safe

Question 16

2. 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

Answer 16

b. environmentally sealed first stage

Question 17

3. 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

Answer 17

c. hydrostatic/pressure tested

Question 18

6. 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

Answer 18

b. second stage

Question 19

13. 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

Answer 19

b. capillary

Question 20

20. 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.

Answer 20

a. ascend to 5 metres/15 feet and make a long safety stop, perhaps lasting as long as your
air supply permits.