OCEAN DIVER
Theory Assessment Paper
Instructor Version with Answers
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If you have a problem with the written format used in this exam, ask for help. You can take an oral exam
if you prefer.
Use the supplied answer sheet for your responses.
This question paper is to be returned at the end of the assessment
There are 30 questions in this assessment. Attempt as many questions as possible.
Marks Available = 30, Pass mark = 80% (24 marks.) Time Allowed = 30 minutes.
There are two types of question. The following examples show how to select an answer:
Multiple Choice Question
Multiple Option Question
You are given five answers labelled A B C D E. Only
one is correct. If you think that none, or more than
one seems correct, always choose the one that
corresponds best to your BSAC diver training. Select
the letter corresponding to your choice and circle it on
the answer grid.
Example
You are given a list of four alternatives labelled 1 2 3
4. One or more of them may be correct. You are also
given a list of five answers labelled A B C D E which
describe various combinations of the alternatives.
These are the same for every multiple option
question. Select the letter corresponding to the
correct combination of alternatives and circle it on the
answer sheet. There is only one correct answer. If
you think that none, or more than one seems correct,
always choose the one that corresponds best to your
BSAC diver training.
Example
Which of the following items of diving equipment has
a mouthpiece?
A: air cylinder

B: diving torch
C: snorkel
D: fins
E: drysuit




Answer = C
Which of the following items of diving equipment
have a mouthpiece?
1:snorkel

2:AS
3:diving torch
4:demand valve



A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
Answer = C because 1+2+4 are correct
You will need
Pencil, Eraser & Calculator
BSAC 88 Decompression Tables
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Instructor Manual rev 3.2 © BS-AC 2006
Ocean Diver Assessment Paper A 1/5
1
The neck of a diving cylinder carries the
following markings:
HYDROTECH-M25X2 FABER 93/9504/904 TP
348 BAR 06]93 EN5045/1 CM/S CP 232 BAR
15°C 3.0 L 3.7 Kg 7P95V 7P97 8P99V 10P01
2004/04V 2006/10
What is the maximum pressure it should be
filled to for diving?
A: 348 bar
B: 232 bar
C: 200 bar
D: 904 bar
E: 504 bar
2. The BSAC 88 tables refer to an ascent rate
of 15 m/min. Should you:
A: ascend to the surface at exactly 15
m/min
B: ascend to 6m at exactly 15 m/min
C: ascend to the surface at a maximum
of 15 m/min
D: ascend to 6m at a maximum of 15
m/min
E: ascend to 6m at a minimum of 15
m/min
3. Assuming you have not dived in the
previous 16 hours what is the maximum no
stop time in minutes allowed for a dive to
18m on the BSAC 88 Level 1 tables?
A: 51
B: 44
C: 68
D: 37
E: 74
4. You surface from a dive to 20m at 1110 hrs
with a surfacing code of D. What is the
deepest you can go to for a dive time of 30
mins starting at 1425 the same day?
A: 18
B: 15
C: 20
D: 24
E: 6
5. One of the principal advantages of a dive
computer is that it often gives a longer dive
time than a table. But for which type of dive
profile is a computer likely to give a similar
dive time to a table?
A: short dive to maximum depth
followed by gradual ascent
B: saw tooth profile with many ups and
downs
C: most of dive spent at maximum
depth
D: gradual descent reaching maximum
depth towards end of dive
E: bounce to maximum depth then
remainder of dive in 6m or less
6. If you have been sea sick but have
recovered enough to dive, what precaution
should you take to reduce your risk of DCI?
A: stay in the middle of the boat
B: get someone to help you kit up
C: drink fluids before the dive
D: eat before the dive
E: eat after the dive
7. What is the maximum dive time for a dive to
18m breathing Nitrox 36 and a surfacing
code of F on Table A?
A: 162 min
B: 100 min
C: 80 min
D: 67 min
E: 51 min
8. If you remove an item from a wreck without
the owner's permission:
A: you should report it to the
Receiver of Wreck
B: you can keep it if it is less then 100
years old
C: you should report it to BSAC HQ
D: you should report it to the nearest
police station
E: it becomes yours if you keep it for a
year and a day
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Instructor Manual rev 3.2 © BS-AC 2006
Ocean Diver Assessment Paper A 2/5
9. Which of the following contains only BSAC
qualifications?
A: Ocean Diver; Advanced Diver; Dive
Leader; Rescue Diver
B: Ocean Diver; Sports Diver; Open
Water Diver; First Class Diver
C: Ocean Diver; Sports Diver; Dive
Leader; Advanced Diver; First
Class Diver
D: Ocean Diver; First Class Diver;
Sports Diver; Master Scuba Diver,
Dive Leader
E: Sports Diver; Ocean Diver; Dive
Leader; Dive Supervisor, Advanced
Diver
10. A given volume of gas will expand to three
times its original volume on ascent from:
A: 30m to the surface
B: 20m to the surface
C: 10m to the surface
D: 40m to the surface
E: 50m to the surface
11. What pressure will the second stage of a
demand valve deliver into a diver’s mouth
at 10m?
A: 1 bar
B: 1.5 bar
C: 2 bar
D: 3 bar
E: 4 bar
12. If the weight of an object exceeds the
weight of water it displaces, the object will:
A: float
B: be neutrally buoyant
C: sink
D: compress
E: rise
13. Water pressure on the eardrum is equalised
by allowing breathing gas into the middle
ear cavity through the:
A: eustachian tube
B: inner ear
C: facial sinuses
D: ear drum
E: outer ear
14. What are the waste products produced by
the body cells as a result of metabolism?
A: oxygen+ nitrogen
B: carbon dioxide + nitrogen
C: nitrogen + oxygen
D: oxygen + water
E: carbon dioxide + water
15. The lung capacity of the average adult is?
A: 0.5 litres
B: 4.5 litres
C: 6 litres
D: 1.5 litres
E: 3 litres
16. If you hyperventilate when breath-hold
diving, you run the risk of:
A: burst lung on ascent
B: decompression illness
C: passing out underwater due to
excess carbon dioxide build-up
D: passing out underwater due to
excess oxygen build-up
E: passing out underwater due to
insufficient oxygen
17. Which part of the body, if unprotected, is
the greatest source of heat loss?
A: hands and feet
B: chest
C: armpits
D: head
E: legs
18. Which of the following statements most
accurately describes the Dive Manager's
authority?
A: the Dive Manager can abort a dive
only if the DO or Chief Instructor
agrees
B: the Dive Manager can abort a dive
at his/her discretion
C: the Dive Manager can abort a dive if
all the divers present agree
D: the Dive Manager can abort a dive if
a majority of divers present agree
E: the Dive Manager can abort a dive if
the skipper or boatman agrees
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Instructor Manual rev 3.2 © BS-AC 2006
Ocean Diver Assessment Paper A 3/5
24. As an Ocean Diver you will be qualified to:
19. Ocean Divers Jane and Mark begin a dive
with 210 bar and 180 bar respectively in
their cylinders. What contents gauge
readings should they plan as the turnround
or halfway point for their dive?
A: 140 bar on either gauge
B: 120 bar on either gauge
C: 140 bar for Jane;120 bar for Mark
D: 105 bar for Jane; 90 for Mark
E: 90 bar on either gauge
20. What advantage does breathing Nitrox give
a BSAC Ocean Diver?
A: lower risk of DCI
B: longer no-stop times
C: lower risk of oxygen toxicity
D: lower equipment and servicing costs
E: greater maximum depth
21. Which of the following breathing gases is
an Ocean Diver qualified to use?
1: compressed air
2: Nitrox 35.1
3: Nitrox 31.1
4: Nitrox 32.9
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
22. Which of the following hazards may be
encountered in inland lakes and quarries?
1: poor visibility
2: deep water close to shore
3: tides
4: tidal currents
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
23. Night diving gives the possibility of:
1: longer dives at the same depth than
in daylight
2: reduced chance of DCI
3: reduced reference points
4: seeing marine life not active in the
daytime
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
1: dive to 20m with another Ocean
Diver, under the supervision of a
dive manager
2: go diving unsupervised to 20m with a
Sports Diver
3: dive to 30m with a Dive Leader,
under the supervision of a dive
manager
4: go diving unsupervised to 20m with
another Ocean Diver
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
25. Which of the following should you agree
with your buddy when making your dive
plan?
1: signals
2: breathing gas planning
3: depth and time
4: whether to do the dive or not
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
26. In which of the following is it important to
monitor your depth?
1: where the dive site shelves or steps
down to 40m
2: during an ascent from 20m
3: during the descent in good visibility
in an inland quarry with maximum
depth 18m
4: on a flat seabed at 16m in poor
visibility
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
27. Which of the following can predispose
divers to DCI, even though they have
followed their tables or computer
correctly?
1: dehydration
2: getting cold
3: inexperience
4: unfitness
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
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Instructor Manual rev 3.2 © BS-AC 2006
Ocean Diver Assessment Paper A 4/5
28. What factors, in addition to depth and dive
duration, can cause increased gas
consumption?
1: cold
2: hard finning
3: anxiety
4: lack of fitness
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
29. If, during a dive, you suspect you are
breathing contaminated gas you should:
1: abort the dive
2: tell the dive manager
3: surface for a fresh cylinder and
resume the dive
4: do not dive again that day
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
30. Which of the following happens in the
alveoli?
1: oxygen diffuses into the bloodstream
2: carbon dioxide diffuses out of the
bloodstream
3: nitrogen diffuses into the
bloodstream
4: nitrogen diffuses out of the
bloodstream
A: 1 only B: 1+2 only C: 1+2+4 only
D: 3+4 only E: all four
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Instructor Manual rev 3.2 © BS-AC 2006
Ocean Diver Assessment Paper A 5/5