Dive Master Practice Exam

Browse all practice questions for the Dive Master Practice Exam. Search by topic, open any question and review its full explanation, then test yourself in the practice quiz.

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Arteries carry blood away from the heart: a clear guide for diving medicineWhat type of blood vessels carry blood away from the heart?Avoiding Fast, Shallow Breaths Can Enhance Your Diving ExperienceWhat should be avoided to prevent problems with dead air space during diving?Divers should be cautious about decompression sickness during rapid ascentsWhat should divers be particularly cautious of when performing rapid ascents?How Does Carbon Monoxide Bond More Readily Than Oxygen?What does carbon monoxide bond with more readily than oxygen?How Pressure Affects Gas Solubility in WaterIf the pressure surrounding a glass of water is increased, what will happen to the amount of gas dissolved in the water?How to Increase an Object's Buoyancy EffectivelyWhich action will increase an object's buoyancy?How to Understand Your New Pressure Group After a Surface IntervalWhat would be the diver's new pressure group after a 45 minute surface interval in pressure group R?Understand the Maximum Distance from the Recreational Dive PlannerWhat is the maximum distance a diver should be from the RDP when using it?Understanding Absolute Pressure Under Water at 20 MetersWhat is the absolute pressure at 20 meters/66 feet of salt water?Understanding Carbon Monoxide Concentration for DiversIf a diver breathes air with 0.05% carbon monoxide at three atmospheres, what is the equivalent concentration at one atmosphere?Understanding how a thermocline separates ocean layersA thermocline indicates a layer in the ocean where temperature differences are pronounced. What does this layer separate?Understanding Shallow Water Blackout and Its CausesDuring what body condition does shallow water blackout most likely occur?Understanding the Key Role of the Environmental Seal on Your Regulator's First StageWhat is the purpose of the environmental seal on a regulator's first stage?Understanding the Purpose of Voluntary Hyperventilation Before a DiveWhat is the purpose of voluntary hyperventilation before a dive?Understanding the Signs of Severe Hypothermia in DiversWhat is a sign of severe hypothermia in divers?What Happens to an Object's Buoyancy When You Add Weight?What happens to an object's buoyancy if you add more weight to it?What Happens When a Diver Struggles to Equalize Ear Pressure?What may occur if a diver blows long and forcefully against a pinched nose while struggling to equalize ears?
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  • Water conducts heat away from the body faster than how many times compared to air?
  • What is the purpose of giving oxygen to a diver in distress after ascending?
  • A __________ exists when relatively warm, low-density surface water is separated from cool, high-density deep water.
  • True or False: Regular inspections of scuba cylinders are essential due to the risk of internal corrosion affecting the valve or regulator.
  • Can several issues with a dive computer be attempted to fix in the field?
  • What substance in the environment can help to regulate water temperature and thermal energy absorption?
  • What tool is often used to assist divers in calculating dive limits and safety stops?
  • What is the primary function of veins in the circulatory system?
  • Why do scuba divers increase their risk of decompression sickness when ascending to altitude soon after a dive?
  • What effect can wearing a tight wetsuit hood have on the body?
  • Which part of the ear is primarily affected during descent while scuba diving?
  • The burst disk releases pressure from an over-pressurized cylinder by opening a spring-loaded release valve. Is this statement true or false?
  • What is the ending pressure group after three dives with specific durations and surface intervals?
  • Which of the following methods should you use to extend breath-hold time?
  • What precaution is necessary to prevent the regulator from freezing during cold water dives?
  • If you raise the pressure of gas in contact with a liquid, what occurs?
  • If a diver reports a headache and red lips after a dive, what is a likely cause?
  • When sound travels underwater, what do divers often have difficulty determining?
  • As pressure increases, how does nitrogen behave in the body?
  • What occurs when the pressure of a gas in contact with a liquid is reduced?
  • What happens to nitrogen levels in the body during descent?
  • What are the primary functions of the circulatory and respiratory systems working together?
  • What is a major risk associated with excessive hyperventilation before a breath hold dive?
  • What phenomenon occurs after strong winds push surface waters offshore, leading to clearer and cooler water conditions?
  • Natural processes, such as earthquakes and storms, pose a greater threat to coral reefs than human-induced threats like pollution.
  • What technique is crucial for controlling buoyancy effectively while diving?
  • True or False: The most common issue with a submersible pressure gauge (SPG) is damage from snagging on surfaces underwater.
  • True or False: The Haldanean decompression model helps prevent decompression sickness by maintaining the pressure gradient within acceptable limits.
  • What are the signs and symptoms of gas narcosis?
  • In which context is sound notably faster in water?
  • What symptom indicates that a diver might be suffering from heat stroke?
  • An environmental seal makes it completely impossible for a regulator first stage to freeze. True or False?
  • What is one method of increasing buoyancy while diving?
  • What essential factor do divers need to control for safe breath hold diving?
  • What is the pressure group after three specific dives on a live-aboard boat?
  • Continuing a dive with unequalized ears could result in:
  • Which signs and symptoms might indicate a diver is suffering from hypothermia?
  • What is typically diminished in the body during excessive hyperventilation before a dive?
  • When underwater, light behaves differently. Which effect causes objects to appear distorted?
  • If a diver feels light-headed due to a neck seal issue, what could be the reason?
  • If a diver experiences a "wet" breathing regulator, what is a likely cause?
  • What are capillaries primarily responsible for?
  • What action should a diver take if they experience a malfunctioning regulator?
  • What condition is indicated by a hot, flushed skin and stopping perspiration on a hot day?
  • What is the primary first aid method for a near drowning accident?
  • If you hear something sloshing inside a scuba cylinder, what should you do?
  • If an object is neutrally buoyant in fresh water, what happens when it's placed in salt water?
  • When breathing a gas mixture at depth, how does the effect of the gas compare to that at the surface?
  • What is the primary purpose of a dive computer?
  • Does hemoglobin give up oxygen to the tissues during circulation?
  • Which principle explains the upward force felt when submerged in water?
  • Blood vessels that carry blood towards the heart are known as what?
  • What can a long, forceful equalization lead to?
  • What is the term used for the tendency of water to cool you due to the displacement of warm water with cooler water?
  • What is the relationship between gas pressure and solubility at varying depths?
  • What is the maximum partial pressure of oxygen (PO2) you should not exceed to avoid CNS oxygen toxicity?
  • Which type of depth gauge operates on the principle of pressure causing a sealed coiled tube to coil tighter?
  • An invasive species introduced into an ecosystem often has no natural enemies, allowing it to multiply rapidly. True or False?
  • What is the term for the flow of heat through a liquid?
  • If a cylinder of air lasts 20 minutes at 20 meters, how long will it last at 10 meters?
  • If a diver has difficulty equalizing their ears, what technique should they avoid?
  • What can excessive hyperventilation prior to a dive ultimately lead to?
  • What is the system called in which the first stage is screwed into the cylinder valve?
  • What is a common consequence of not allowing adequate surface time after a dive?
  • What is the risk of elevating carbon dioxide levels when diving?
  • Do decompression models help reduce DCS risk by controlling gas supersaturation?
  • Why does a temperature that feels comfortable in air quickly become uncomfortable in water for an unprotected diver?
  • Why is it dangerous to delay the urge to breathe during a dive?
  • What is the difference between gauge and absolute pressure called?
  • What is a symptom of oxygen toxicity related to vision?
  • If a diver stays at a certain depth, what will eventually happen to their tissues regarding nitrogen?
  • What is the buoyancy of an object that is heavier than the fluid it's placed in?
  • When do symptoms of lung-expansion injury typically appear compared to decompression sickness?
  • In which type of ecosystem do invasive species often thrive due to the lack of natural predators?
  • What does the first stage of a regulator do with the pressure from the cylinder?
  • An hour after surfacing from a deep dive, a diver experiences fatigue and shoulder numbness. What is a potential concern?
  • What essential substance do arteries primarily transport away from the heart?
  • How is the hydrostatic test date identified on a scuba cylinder?
  • What is an effect of extreme dehydration on diving?
  • What causes the majority of ocean waves?
  • When gas flows to the second stage, what happens in the first stage intermediate pressure chamber?
  • Which of the following statements is true regarding dive safety?
  • What does ambient pressure measure?
  • After completing a dive to 24 metres and waiting 39 minutes, what is the pressure group after a second dive to 18 metres for 25 minutes?
  • Which object appears magnified when viewed underwater?
  • What type of pressure does the second stage of a regulator deliver to the diver?
  • What direction do arteries carry blood in relation to the heart?
  • What is convection in the context of heat transfer?
  • Why does water absorb more heat than air?
  • How much faster does sound travel in water compared to air?
  • What does a transducer in a dive computer convert?
  • How many times did "Safety Stop 3 min - See Rule 2" appear on the eRDPML for the previous question's dives?
  • To protect core temperature, what does the body do?
  • What is the ocean's major source of productivity and the base of the marine food chain?
  • If a volume of air is taken to a depth of 33 feet in seawater, what happens to its volume compared to when it was at the surface?
  • What does "fail-safe" design refer to in a scuba regulator?
  • What is the primary function of arteries in the circulatory system?
  • Which method can help encourage divers to protect the underwater environment?
  • At a depth of 30 meters/99 feet, how much denser is the air you breathe compared to the surface air?
  • True or False: A minimum surface interval of at least one hour is required for a fourth dive after three dives.
  • What phenomenon involves the bending of light?
  • What is buoyancy?
  • What does absolute pressure refer to?
  • True or False: Sound travels faster in water than in air because water is less dense than air.
  • What is the first aid response for the diver suffering from the condition in the previous question?
  • Which of the following is not a symptom of carbon monoxide poisoning?
  • At sea level, what is the absolute pressure?
  • What can happen to a diver if nitrogen narcosis occurs?
  • What is a recommended practice to avoid shallow water blackout?
  • What is a correct definition of partial pressure?
  • What happens to the density of water as it warms?
  • Which factors should divers avoid to reduce the risk of decompression sickness?
  • Why is it more difficult to determine the direction of sound while diving?
  • What happens when the volume of a gas is compressed underwater?
  • When gas has fully dissolved in a liquid to the point where no more can enter, this state is called what?
  • Gravitational interaction between celestial bodies influences ____________, while wind primarily disturbs ____________.
  • What does Henry's Law state about a gas in contact with a liquid?
  • If you observe water moving down the coast, pushed by waves at an angle and assisted by wind, you are viewing a _____________________ current.
  • When light passes from water to air, what does it change that causes it to alter direction?
  • How does increasing depth affect the partial pressure of gases in the body?
  • A mechanical SPG that reads high may indicate a malfunction. Is this statement true or false?
  • A diver feels dizzy and confused shortly after surfacing. What should be the immediate concern?
  • When an object is lifted in 20 meters of seawater using a lift bag filled halfway with air, will the air start bubbling out of the bag before reaching the surface?
  • True or False: A safety stop is required on both dives if a diver has a 28 minute dive to 24 metres followed by a dive to 18 metres.
  • What is a recommended procedure for using dive computers during a dive?
  • What is considered a safe ascent rate for divers after completing a dive?
  • At saturation, what happens to the pressure of the dissolved gas?
  • Which component carries oxygen in the blood?
  • A diver shivering uncontrollably with impaired muscle coordination likely has:
  • What will happen to a balloon filled with air when taken from a cold environment to a warm one near a heater?
  • What indicates that a scuba cylinder may need inspection?
  • When the skin capillaries dilate, what is the purpose?
  • How can you alleviate the effects of overexertion while diving?
  • What is the hydrostatic test date of a cylinder marked with the numbers 12343 PST 6 96?
  • In a situation where a diver is using EANx30 at 30 meters, what is the partial pressure of oxygen (PO2)?
  • If a diver with Type 1 DCS wants to sit up to call his family, what should you recommend?
  • What visual symptom may indicate the need for treatment of decompression sickness?
  • How does changing your breath control impact buoyancy?
  • In breath hold diving, what level of carbon dioxide in the body is essential?
  • How much faster does sound travel in water compared to air?
  • What is the risk if a diver ascends too quickly to the surface after a deep dive?
  • What does partial pressure refer to?
  • A diver ascends from a dive while holding their breath and later experiences confusion, dizziness, and collapses. What condition is the diver likely suffering from?
  • What does conduction refer to in terms of heat transfer?
  • What factors may predispose a diver to Decompression Sickness (DCS)?
  • What indicates heat exhaustion in a diver?
  • What do electronic depth gauges and electronic SPGs both utilize to measure depth?
  • What is the maximum allowable time for the third level of a multilevel dive at 12 m/40 ft?
  • What is one consequence of shallow water blackout?
  • What is the role of a pocket mask with free flow oxygen in a first aid scenario?
  • What design characteristic typically causes a regulator to malfunction and free flow?
  • What should divers be cautious about when preparing for a breath hold dive?
  • What is type 1 DCS characterized by?
  • Which of the following accurately describes shallow water blackout?
  • Due to refraction, underwater objects appear to be magnified by what factor?
  • What is a common cause of dry suit squeeze?
  • How does excessive hyperventilation affect the body’s urge to breathe?
  • A diver using EANx32 at a depth of 10 meters would calculate oxygen exposure based on which partial pressure?
  • If an air mixture contains 80% nitrogen and 20% oxygen at sea level, what will the partial pressure of nitrogen be at 20 meters/66 feet in sea water?
  • What is the correct relationship between arteries and veins in the circulatory system?
  • True or False: Increasing your breath rate while using a snorkel can help mitigate increased dead-air space.
  • What is the primary reason compressed air must be carefully managed during a dive?
  • What physiological change occurs due to excessive hyperventilation before diving?
  • What is one risk factor for decompression sickness?
  • Water dissipates body heat approximately how many times faster than air?
  • What does refraction primarily cause light to do?
  • What is considered the most serious lung overexpansion injury?
  • What is the first step in using a dive computer correctly?
  • What is the most serious sign of Central Nervous System (CNS) toxicity?
  • What type of current results when waves approach the shore at an angle?
  • Which factor primarily influences the buoyancy of a diver?
  • What is the primary role of phytoplankton in marine ecosystems?
  • What should a diver do immediately after surfacing if they suspect DCS?
  • Is there zero risk of decompression sickness if you stay within dive table limits?
  • A diver makes three dives in a day. What would typically be the maximum allowable surface interval between these dives?
  • Which of the following measurements is taken into account for understanding the impact of depth in scuba diving?
  • Why is it important to avoid diving with head congestion?
  • What is the most efficient way to provide oxygen to a breathing, injured diver?
  • True or False: A near drowning patient may appear fully recovered but should seek medical attention due to potential water in the lungs.
  • What is the result of decreased carbon dioxide levels from voluntary hyperventilation?
  • Is it possible to feel cold even while wearing an exposure suit in warm water?
  • What does a half-time represent in diving?
  • What is the method of measuring depth in relation to pressure change in standard dive gauges?
  • How many times faster does sound travel in water compared to air?
  • If an object's density is less than that of the fluid it is placed in, what will happen?
  • What gas do divers commonly notice narcosis from at a depth of about 30 meters?
  • If an object is neutrally buoyant in seawater, what will happen in fresh water?
  • What should divers do if they experience discomfort in their ears while diving?
  • What type of action occurs with the movement of warmer water replacing cooler water?
  • What changes to mood can be observed with carbon dioxide accumulation?
  • If a balloon is filled to 1 liter at 40 meters/132 feet and released, what will its volume be upon reaching the surface?
  • What is a common symptom of carbon monoxide poisoning?
  • What is the recommended waiting period after completing a single dive before flying?
  • What is the no decompression limit for a dive to 19 m/62 ft?
  • What depth should divers avoid exceeding to reduce the risk of decompression sickness during no decompression dives?
  • Which of the following best describes a preventative measure for shallow water blackout?
  • When a diver ascends, what happens to dissolved gases in the blood?
  • What are the common causes of a wet-breathing regulator?
  • In which situation would you expect a gas to remain in solution only until saturation is reached?
  • At what depth do most divers experience narcosis according to common knowledge?
  • Which type of cylinder valve allows the regulator to screw directly into the valve?
  • What happens to light when it passes through substances of different densities?
  • What property of water allows sound to travel faster through it than in air?
  • True or False: Divers must confirm the oxygen percentage in enriched air cylinders before setting their dive computers.
  • How does increasing pressure affect the solubility of gases in divers' bodies?
  • Which artery is considered the largest in the human body?
  • Which of the following statements about gases dissolving in liquids is correct?
  • What does hyperventilation before a dive primarily affect?
  • As a wave approaches shore, it becomes unstable due to the bottom causing the wave height to rise and spill its energy. True or False?
  • In scuba diving, why do you tend to rise when you inhale and sink when you exhale?
  • Which of the following is a sign of oxygen toxicity?
  • What causes objects to appear larger and closer when viewed underwater?
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