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PADI Divemaster Theory Prep

Physics, physiology, equipment and decompression theory.

Written against the published specification.

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Pass mark 30/40 60 minutes PADI syllabus-aligned How many can I get wrong?
About this practice. Revision Robin is built and maintained by Bloor Engineering Ltd, a UK-registered company. Our PADI Divemaster Theory Prep questions are written and reviewed in-house to match the current syllabus, each with a plain-English worked explanation. They are original practice material, not the official exam questions and not affiliated with or endorsed by PADI syllabus-aligned. Always confirm current test rules, fees and content with the official provider. See our Terms and Privacy.
Little and often beats one big session. Five minutes on the bus counts.
Free practice questions
Try 3 real PADI Divemaster Theory Prep questions
Have a go, then reveal the worked explanation. A taster from a bank of 229 original questions. Unlock for unlimited drills and full timed mocks.
Q1. At the surface, a diver is exposed to 1 atmosphere (1 bar) of pressure. What is the approximate ambient pressure at a depth of 20 metres of seawater?
  • A.  2 bar
  • B.  3 bar
  • C.  4 bar
  • D.  1.5 bar
Show answer & explanation
✓ Answer: B. 3 bar
Pressure increases by roughly 1 bar for every 10 metres of seawater, plus the 1 bar of atmospheric pressure at the surface. At 20 m that is 1 bar (surface) + 2 bar (water) = 3 bar absolute. A common mistake is forgetting to add the surface atmospheric bar.
Q2. A diver reports a mottled, itchy skin rash with a marbled appearance shortly after surfacing. What is this most likely a sign of?
  • A.  Cutaneous (skin) decompression sickness
  • B.  An allergic reaction to sunscreen
  • C.  Salt water dermatitis
  • D.  Normal skin cooling after a dive
Show answer & explanation
✓ Answer: A. Cutaneous (skin) decompression sickness
Cutaneous DCS presents as itching, a mottled or marbled rash (sometimes called 'cutis marmorata'), and can indicate bubble formation in or under the skin. While it is technically Type I DCS, it can sometimes signal more serious bubble activity elsewhere and should always be evaluated by a diving physician, not dismissed as a skin irritation.
Q3. A diver plans a repetitive dive but the RNT for that depth already meets or exceeds the no-decompression limit. What does this mean for the dive as planned?
  • A.  The dive can proceed but a decompression stop is mandatory
  • B.  The diver must select a shallower depth or extend the surface interval before diving that depth
  • C.  The dive can proceed with no changes since the RDP always allows repetitive dives
  • D.  The diver should switch to nitrox to avoid the restriction
Show answer & explanation
✓ Answer: B. The diver must select a shallower depth or extend the surface interval before diving that depth
If RNT equals or exceeds the no-decompression limit for the intended depth, the adjusted no-decompression limit is effectively zero or negative, meaning that depth cannot be dived within no-decompression limits yet. The diver must either wait longer on the surface or choose a shallower repetitive dive.
Exam mode
Full mock exam
40 random questions, real timing, marked against the official pass mark. Different every time.
The first 8 of 40 questions are free, with your score on them. Finishing the paper, your result against the pass mark and every answer explained come with the paid version.
Practice material only. This is revision practice, not official training, assessment or certification, and not a substitute for the required course or supervised experience. Always confirm the current requirements with the official awarding body or test provider before relying on it.
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Topic drills
Ten quick questions on one topic, marked instantly with explanations.
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Dive physics — pressure, buoyancy, gases · 38
Physiology & decompression sickness · 38
The RDP & dive planning · 37
Equipment & maintenance · 35
Supervision, risk & rescue basics · 36
The aquatic environment · 45

Who has to sit the PADI Divemaster Theory Prep

Who needs a PADI Divemaster Theory Prep?

All individuals pursuing PADI Divemaster certification must complete the theory exams.

The real PADI Divemaster Theory Prep: format

How many questions are in the PADI Divemaster Theory Prep?

The real PADI Divemaster Theory Prep has 120 questions. Our mock uses 40 questions in 60 minutes.

What is the PADI Divemaster Theory Prep pass mark?

Real exam pass mark: 75% in each of two exams (Dive Theory & PADI Standards). For Dive Theory, 75% in each of five sections. Our mock marks you at 30 out of 40, the threshold we mark against.

What it costs, and what a resit costs

How much does the PADI Divemaster Theory Prep cost?

Real exam fee: Typically bundled within the full PADI Divemaster course (e.g., £549-£899). Divemaster eLearning materials approximately £200-£250. Rebooking after a fail: If failing multiple sections or a retake, candidates must attend a later PADI Instructor Exam to repeat written exams.

How hard is it

How hard is the PADI Divemaster Theory Prep?

Difficulty: Challenging but rewarding. Requires expanding dive knowledge, leadership skills & practical experience.

Why people fail it

Why do people fail the PADI Divemaster Theory Prep?

Figures for the real exam from vertexaisearch.cloud.google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.
PADI Divemaster Theory Prep: common questions
Frequently asked
How long do you get?
The test is timed at 60 minutes. Our full mock runs on the same clock so you can practise your pacing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with PADI syllabus-aligned.