Open Water Diver Exam
Test your knowledge with our free OWD practice test.
Exam
Open Water Diver / 1* Diver
The Open Water Diver / 1* Diver course is the basic training in scuba diving.
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How it works
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Answer multiple-choice questions at your own pace. No time pressure.
Review your results
See which questions you got right and where to focus next. Repeat anytime.
What is the Open Water Diver certification?
The Open Water Diver (OWD) certification is the world's most popular entry-level scuba diving licence. It qualifies you to dive independently with a buddy to a maximum depth of 18 metres (60 feet). Millions of divers earn this certification every year through agencies such as PADI, SSI, CMAS, and others.
The OWD course covers dive theory, confined-water training, and open-water dives. The theory component includes physics, physiology, equipment, dive planning, and environmental awareness – exactly the topics tested in our free online practice exam.
What does the OWD theory exam cover?
The Open Water Diver theory exam tests your understanding of the fundamental concepts needed for safe diving. While the exact format varies between training agencies, the core topics are universal:
- Dive physics – pressure, buoyancy, gas laws (Boyle's law, Henry's law, Dalton's law)
- Dive physiology – effects of pressure on the body, decompression sickness, nitrogen narcosis, barotrauma
- Equipment knowledge – regulators, BCDs, dive computers, exposure suits, tanks
- Dive planning – no-decompression limits, dive tables, buddy checks, surface intervals
- Underwater skills – navigation, communication, buoyancy control
- Safety & environment – emergency procedures, responsible diving, marine conservation
How to prepare for your Open Water Diver exam
The best way to prepare for your OWD theory exam is to combine study materials with practice tests. Read through your course manual, then test your knowledge with our free online exam. You'll get instant feedback on every question, helping you identify gaps in your understanding.
Our practice exam has no time limit, so you can take it at your own pace. Repeat it as many times as you like until you feel confident. Arriving at your dive course with a solid theoretical foundation means less stress and more time to enjoy the water.
Why practise with online tests?
Online practice exams are one of the most effective ways to prepare for any certification. Research shows that active recall – testing yourself on material – leads to better retention than passive reading alone.
On Scuba Test Online, all practice exams are completely free, with no registration wall for browsing. Once registered, your results are saved so you can track your progress over time. This site is agency-independent and not affiliated with PADI, SSI, CMAS, or any other training organisation – the questions are based on universal dive theory that applies regardless of your chosen agency.
Who is this practice exam for?
This exam is designed for anyone preparing for their Open Water Diver certification – whether you're about to start your first dive course, or you want to refresh your knowledge before getting back in the water. It's also useful for dive instructors who want to give their students extra practice material. No matter which training agency your dive school works with, the fundamentals tested here are the same.
Frequently asked questions
Is this the official Open Water Diver exam?
No, this is an independent practice test – not an official exam from any training agency. It is designed to help you prepare for the theory component of your OWD certification course. Your official exam will be conducted by your dive instructor or training agency.
How hard is the Open Water Diver exam?
Most divers find the OWD theory exam manageable with good preparation. The questions cover dive physics, physiology, equipment, and safe diving procedures. Regular practice with our free test helps you identify knowledge gaps before the real exam day.
How many questions does the OWD exam have?
The exact number varies by training agency, but typical OWD theory exams include 25–50 multiple-choice questions. Our practice test uses a comparable format. You can retake it as many times as you like.
Do I need to study the course theory to pass?
Yes. The theory exam tests genuine understanding – guesswork alone won't get you through. Read your course manual first, then use our practice test to check your knowledge. Many divers use both in parallel for the best results.
Can I practise on mobile?
Absolutely. The practice test works on any device – smartphone, tablet, or desktop. No app download required. Open the page in your browser and start.
What topics does the OWD practice test cover?
The test covers all core Open Water Diver theory: dive physics (pressure, buoyancy, gas laws), dive physiology (decompression sickness, barotrauma, nitrogen narcosis), equipment (regulators, BCDs, dive computers), dive planning (no-decompression limits, buddy system), and environmental awareness.
Is this practice test free?
Yes, completely free. No credit card, no subscription, no paywall. Create a free account to save results and track progress over time.
Which training agencies does this cover?
This practice test is agency-independent. Core dive theory is the same regardless of whether you train with PADI, SSI, CMAS, NAUI, or any other recognised agency. We do not represent or endorse any specific organisation.
How many times can I retake the test?
Unlimited. There is no cap on retakes. Your best score and attempt history are saved to your account so you can track improvement.
What score do I need to pass the real OWD exam?
Most agencies require 75–80 %. Our practice test gives instant feedback so you can see where you stand and keep practising until you feel ready.
Disclaimer: Scuba Test Online is an independent website and is not affiliated with, endorsed by, or connected to any diving training agency. Trademarks belong to their respective owners.