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PADI Open Water Diver Certification: Scuba Diving Knowledge Review, Exams of Water and Wastewater Engineering

Bidwell Training CenterWater and Wastewater Engineering

A comprehensive knowledge review for the padi open water diver certification. It covers essential topics such as scuba equipment, pressure changes at depth, equalization techniques, breathing rules, buoyancy control, and dive planning. The review includes questions and answers designed to reinforce understanding of key concepts and safety procedures for scuba diving. It also addresses potential hazards and emergency procedures, making it a valuable resource for divers preparing for certification or seeking to refresh their knowledge. Useful for university students, high school students and lifelong learners.

Typology: Exams

2025/2026

Available from 12/03/2025

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PADI Open Water Diver Certification
1.SCUBA: Self contained underwater breathing apparatus
2.What is the pressure change for each 10m/33ft of depth
change?: 1 bar/1 ata/1 atmosphere
3.What is the relationship between my depth in water and the
pressure?: The deeper you go in water, the more the pressure
increases
Pressure is expressed as the weight of air
4.What is the relationship between pressure, and the volume
and the density of air?: As pressure increases, the gas volume
decreases and the gas density increases
5.If I take a volume of air from one depth to another depth, how
much will the volume and density change?: Volume will be 1/ata#
Density will be ata#
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Download PADI Open Water Diver Certification: Scuba Diving Knowledge Review and more Exams Water and Wastewater Engineering in PDF only on Docsity!

PADI Open Water Diver Certification

  1. SCUBA: Self contained underwater breathing apparatus
  2. What is the pressure change for each 10m/33ft of depth change?: 1 bar/1 ata/1 atmosphere
  3. What is the relationship between my depth in water and the pressure?: The deeper you go in water, the more the pressure increases Pressure is expressed as the weight of air
  4. What is the relationship between pressure, and the volume and the density of air?: As pressure increases, the gas volume decreases and the gas density increases
  5. If I take a volume of air from one depth to another depth, how much will the volume and density change?: Volume will be 1/ata# Density will be ata#
  1. What 3 major body air spaces does increasing pressure affect as I de- scend?: Ears, sinuses, mask
  2. What is a "squeeze"?: The discomfort caused by pressure imbalance pulling tissue into the air space
  3. What is "equalization"?: The addition of air to your air spaces as you descend
  4. How do I equalize as I descend?: For ears and sinuses, pinch your nose and blow gently, or wiggle your jaw and swallow For mask, blow into it with nose
  5. How often should I equalize?: Every meter/few feet, BEFORE you feel discom- fort
  6. What should I do if I can't equalize?: Stop your descent, signal problem and point to your ear, ascend a bit, and try again 12. What can happen if I don't or can't equalize gently and keep descending?-

17. What can happen if I don't follow the most important rule in scuba diving?- : Your lungs will over expand and rupture

  1. What is a "reverse block"?: When expanding air becomes trapped in your body air spaces as you ascend
  2. What should I do if I feel discomfort in my ears, sinuses, stomach, in- testines, or teeth while ascending?: Stop your ascent and descend a meter/few feet to reduce discomfort and give trapped air time to work its way out
  3. How does depth affect how long my air supply lasts?: The deeper you are, the more dense air you breathe, and the faster you use the air in your cylinder. Compared to the surface, air supply lasts 1/#ata as long along with other factors
  4. What's the most efficient way to breathe dense air underwater?: Take slow, deep breaths
  1. How do I breathe to reduce anxiety when under stress?: Do NOT breathe faster - keep breathing slowly
  2. What are my 4 breathing rules as a scuba diver?: 1. Breathe continuously and never hold your breath 2.Breathe slowly and deeply 3.Don't allow yourself to get winded or out of breath 4.If faced with a problem, stop, and reduce anxiety by breathing slowly and deeply
  3. What is buoyancy?: An upward force acting on an object in the water, canceling the pull of gravity
  4. What causes buoyancy?: The upwards force is caused by the water displaced by the object, and is equal to the weight of displaced water
  5. positive buoyancy: The object weighs less than the water it displaces, so it floats

exhaling reduces

  1. What is the buddy system?: Diving with another diver
  1. What are the 3 most important considerations in choosing scuba equip- ment?: Suitability, fit, and comfort
  2. How do I generally care for scuba equipment?: Rinse everything in fresh water and dry it in the shade and store in a cool, dry place
  3. Why do I need a mask?: It provides an air space so your eyes can focus because light behaves differently underwater
  4. Why does my mask need to enclose my nose?: Because the mask creates an air space, you need your nose to blow in it to equalize it
  5. Why do I need a snorkel?: It saves your air supply while your face is in the water
  6. What are 2 basic fin styles?: Full-foot and adjustable strap
  7. What consists of your scuba kit?: Buoyancy control device, regulator, air cylinder, weight system

stage, alter- nate air source, low pressure inflator (LPI) hose, submersible pressure gauge (SPG)

  1. first stage: Supplies air to all the other components, connecting to the cylinder valve by screw or clamp, reduces cylinder pressure to intermediate pressure (above surrounding pressure)
  2. alternate air source: An extra second stage you use for sharing air with a buddy Attaches in triangle area between chin and hips
  3. second stage: Reduces pressure to surrounding pressure, delivers air upon inhalation, vents exhalation Goes over right shoulder
  4. low pressure inflator (LPI) hose: Supplies air to your BCD inflator
  1. submersible pressure gauge (SPG): Hose that tells you air pressure remaining in your cylinder Goes under left arm
  2. What is the most important consideration in choosing a regulator?: The ease of breathing
  3. yoke system: Holds first stage to cylinder with a clamp
  4. DIN system: Regulator screws into valve
  5. What 3 special maintenance considerations do regulators have?: Rinse first stage individually, run water through second stage, have professional overhaul it about every year
  6. What 2 components make up a scuba cylinder?: The aluminum/steel con- tainer and the valve to control air flow
  7. What is a burst disk?: A safety device that relieves overpressure by rupturing and releasing air
  8. What is the most important feature in my weight system?: A

66. go up/end dive:

**67. something's wrong:

  1. down/descend:
  2. low on air:**

72. How does being underwater affect the apparent size or distance of things?- : Refraction occurs, where light changes direction, and things are magnified by 1/

  1. How does water affect light intensity and color?: It reflects, scatters, and absorbs light in the roygbiv order As you go deeper, it gets darker
  1. How does hearing differ underwater?: It travels faster and longer
  2. How does water's density affect moving in water?: It takes more energy the faster you try to swim
  3. What is "airway control"?: The skill of breathing past remaining water without drawing any into your throat after clearing your regulator/snorkel
  4. What are 2 techniques for airway control?: Inhaling slowly, looking down, and touching your tongue to the roof of your mouth as you inhale
  5. What are 8 symptoms of overexertion while diving?: Fatigue, labored breath- ing, a feeling of suffocation, weakness, anxiety, headaches, muscle cramping, and a tendency to panic
  6. What should I do if I think I'm becoming overexerted at the surface and underwater?: Stop all activity, signal your buddy, and rest

out how much pressure you have for the main part of the dive To be safe, plan to use half your air coming down, and half coming back

  1. What are the 5 steps for a proper descent with scuba?: 1. Confirm that your buddy is ready 2.Orient yourself to something 3.Switch from your snorkel to your regulator 4.Check your dive computer/timer 5.Signal "descend" and slowly deflate your BCD
  2. What are the 5 steps for a proper ascent with scuba?: 1. Signal "up" and confirm that your buddy is ready 2.Check your dive computer/timer to be sure you're within dive limits 3.Look up and hold your BCD deflator hose 4.Ascend no slower than your dive computer's maximum rate 5.Look up, turn as you ascend, and stay with your buddy
  1. What is the maximum ascent rate?: 18 m/60 ft//min
  2. What is a safety stop?: A pause in your ascent between 6 m/20 ft and 3 m/10 ft to give your tissues extra time to release dissolved gases for at least 3 minutes
  3. When would I not make a safety stop?: When you're assisting a diver who has an air supply problem or if you're low on air
  4. dive computer: Tells you your time and depth underwater and guides you in keeping dissolved nitrogen in your body within accepted limits
  5. How do I measure/define visibility as a diver?: The distance you can see horizontally underwater
  6. What 4 principles affect visibility?: Water movement, weather, plankton, bot- tom composition
  7. When diving in a mild current, in what direction would I normally go?: Swim slowly into the current so that when you turn the