Knowledge check and Exercise Questions

Question 1

As I descend I need to equalize air spaces. Which of the following are accepted ways of equalizing my ears?
a, block my nose and attempt to gently blow through it.
b. Swallow and wiggle the jaw from side to side.
c. Block my nose and blow forcefully for an extended period.

Answer 1

As I descend I need to equalize air spaces. Which of the following are accepted ways of equalizing my ears?
a, block my nose and attempt to gently blow through it.
b. Swallow and wiggle the jaw from side to side.

Question 2

During a descent, I try to equalize but discover I’m having trouble doing so. Which of the following is correct?

a. Slow my descent, signal my buddy to slow down, and equalize more forcefully.
b. Stop my descent, signal my buddy, ascend slightly and try again.
c. Continue my descent while equalizing repeatedly.
d. Signal my buddy, ascend to the surface and start my descent over.

Answer 2

During a descent, I try to equalize but discover I’m having trouble doing so. Which of the following is correct?
b. Stop my descent, signal my buddy, ascend slightly and try again.

Question 3

I should equalize

a. Early and often
b. When I begin to feel discomfort
c. Only if I experience pain

Answer 3

I should equalize

a. Early and often

Question 4

I should not dive with a cold, nor use medications to dive with a cold. T/F?

Answer 4

I should not dive with a cold, nor use medications to dive with a cold. T/F?
True

Question 5

The most important rule in scuba diving is:

a. Breathe continuously and never hold your breath.
b. Always dive with a buddy
c. Keep my mask on while in the water, even at the surface
d. Check my SPG at least every couple of minutes.

Answer 5

The most important rule in scuba diving is:

a. Breathe continuously and never hold your breath.

Question 6

Failure to follow the most important rule in scuba diving can cause serious lung overexpansion(lung rupture) injuries, which in turn can cause paralysis and death. T/F?

Answer 6

Failure to follow the most important rule in scuba diving can cause serious lung overexpansion(lung rupture) injuries, which in turn can cause paralysis and death. T/F?
True

Question 7

If I feel discomfort in a body air space while ascending, the correct action is to:

a. Continue my ascent while blowing against blocked nostrils.
b. Stop, descend slightly and give trapped air time to work its way out.
c. Descend at least 10m/33ft, then resume my ascent.

Answer 7

If I feel discomfort in a body air space while ascending, the correct action is to:
b. Stop, descend slightly and give trapped air time to work its way out.

Question 8

My buddy and I are planning a dive to 18m/60ft. We would expect our air supply to last___ at 10m/33ft, all else being the same.

a. Longer than
b. Shorter than
c. The same as

Answer 8

My buddy and I are planning a dive to 18m/60ft. We would expect our air supply to last___ at 10m/33ft, all else being the same.
b. Shorter than

Question 9

During a dive, I swim hard to keep up with a fish that interests me, but shortly begin to feel like I can’t get enough air. The correct action would be to:

a. Signal my buddy and head up to the surface.
b. Use the regulator purge button to boost airflow.
c. Stop all activity and rest to restore proper deep, slow breathing.

Answer 9

During a dive, I swim hard to keep up with a fish that interests me, but shortly begin to feel like I can’t get enough air. The correct action would be to:
c. Stop all activity and rest to restore proper deep, slow breathing.

Question 10

An object that is neutrally buoyant in fresh water will ___ in salt water.

a. Sink
b. Float
c. Be neutral

Answer 10

An object that is neutrally buoyant in fresh water will ___ in salt water.
b. Float

Question 11

The three overall benefits of the buddy system are practicality, safety, and fun. T/F

Answer 11

The three overall benefits of the buddy system are practicality, safety, and fun. T/F
True

Question 12

The primary considerations when choosing any piece of scuba Gear are:

a. Suitability
b. Brand
c. Fit
d. Comfort

Answer 12

The primary considerations when choosing any piece of scuba Gear are:

a. Suitability
c. Fit
d. Comfort

Question 13

I’m planning to dive the following week and am checking my gear. I put my kit together and notice that my regulator seems to breathe harder than I remember. The appropriate action would be to:

a. Have it inspected and serviced as needed by a professional before using it.
b. Go ahead and use it, but limit my dive depth
c. Wash it in freshwater and see if the problem persists

Answer 13

I’m planning to dive the following week and am checking my gear. I put my kit together and notice that my regulator seems to breathe harder than I remember. The appropriate action would be to:
a. Have it inspected and serviced as needed by a professional before using it.

Question 14

There is no way to use a DIN regulator on a yoke cylinder valve. T/F?

Answer 14

There is no way to use a DIN regulator on a yoke cylinder valve. T/F?
False. There is an adapter version of the DIN regulator useable on either type valve

Question 15

There is no way to use a DIN regulator on a yoke cylinder valve. T/F?

Answer 15

There is no way to use a DIN regulator on a yoke cylinder valve. T/F?
False. There is an adapter version of the DIN regulator useable on either type valve

Question 16

It is important to master buoyancy control because it allows me to control whether I descend, float, or am neutrally buoyant. I adjust my buoyancy frequently while diving. T/F?

Answer 16

It is important to master buoyancy control because it allows me to control whether I descend, float, or am neutrally buoyant. I adjust my buoyancy frequently while diving. T/F?
True

Question 17

As you descend in water the pressure:

a. Increases
b. Decreases
c. Does not change

Answer 17

As you descend in water the pressure:

a. Increases

Question 18

A depth change of 10 meters/33 feet causes a pressure change of what?

a. 1 bar/ata
b. 2
c. 3
d. 4

Answer 18

A depth change of 10 meters/33 feet causes a pressure change of what?

a. 1 bar/ata

Question 19

If you take 6 litres of air from the surface to 20 m/66 ft, the volume will be ___ liters

a. 1
b. 2
c. 3
d. 4

Answer 19

If you take 6 litres of air from the surface to 20 m/66 ft, the volume will be ___ liters

b. 2

Question 20

The density of air in the previous question would be ___ the density at the surface.

a. ⅓
b. ½
c. 3 times
d. 4 times

Answer 20

The density of air in the previous question would be ___ the density at the surface.

c. 3 times

Question 21

A balloon fully inflated and sealed at 10m/33ft would probably ___ during ascent to the surface.

a. Shrink
b. Burst

Answer 21

A balloon fully inflated and sealed at 10m/33ft would probably ___ during ascent to the surface.

b. Burst

Question 22

As I descend, increasing pressure affects my (choose all that apply):

a. Mask
b. Ears.
c. Sinuses
d. skin

Answer 22

As I descend, increasing pressure affects my (choose all that apply):

a. Mask
b. Ears.
c. Sinuses

Question 23

A squeeze is caused by
A. Wearing my wet suit or other gear too tightly.
B. A pressure imbalance between the surrounding pressure and an ir space.

Answer 23

A squeeze is caused by

B. A pressure imbalance between the surrounding pressure and an ir space.

Question 24

Equalization is the process of

a. Adding air to an air space
b. Removing air from an air space
c. Reducing the surrounding pressure
d. Increasing the surrounding pressure

Answer 24

Equalization is the process of

a. Adding air to an air space

Question 25

I should equalize a. When I feel pain or pressure. b. Only if I can’t tolerate the pain or discomfort. c. Before I feel pain or discomfort. d. When I reach the bottom.

Answer 25

I should equalize c. Before I feel pain or discomfort.

Question 26

I’m descending and discover I can’t equalize. The first thing I would do is a. Equalize more forcefully. b. Stop my descent and signal my buddy/the instructor. c. Slow my descent and see if the problem corrects itself.

Answer 26

I’m descending and discover I can’t equalize. The first thing I would do is b. Stop my descent and signal my buddy/the instructor.

Question 27

I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing. T/F

Answer 27

I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing. T/F True

Question 28

On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should a. Take an approved decongestant so I will be able to equalize. b. Plan to take a lot longer as I descend. c. Cancel the dive until I’m well.

Answer 28

On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should c. Cancel the dive until I’m well.

Question 29

When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure. T/F?

Answer 29

When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure. T/F? True

Question 30

The most important rule in scuba diving is to a. Always dive with a buddy. b. Breathe continuously and never hold your breath. c. Check your air supply every five minutes.

Answer 30

The most important rule in scuba diving is to b. Breathe continuously and never hold your breath.

Question 31

Failure to follow the most important rule in scuba diving can cause severe lung overexpansion injuries, which in turn can cause paralysis and death.T/F?

Answer 31

Failure to follow the most important rule in scuba diving can cause severe lung overexpansion injuries, which in turn can cause paralysis and death.T/F? True

Question 32

During ascent I feel discomfort in my ears. I should a. Continue my ascent at a slightly faster rate. b. Stop, descend slightly and allow trapped air to work its way out. c. Use a decongestant before my next dive. d. Equalize by blowing gently against blocked nostrils.

Answer 32

During ascent I feel discomfort in my ears. I should b. Stop, descend slightly and allow trapped air to work its way out.

Question 33

My buddy and I descend to 12 meters/40ft. I would expect to use my air____ at 6m/20ft. a. Slower than b. At the same rate c. Faster than

Answer 33

My buddy and I descend to 12 meters/40ft. I would expect to use my air____ at 6m/20ft. c. Faster than

Question 34

The most efficient way to breathe dense air underwater is to breathe a. Shallowly and slowly. b. Shallowly and rapidly c. Deeply and slowly d. Deeply and rapidly

Answer 34

The most efficient way to breathe dense air underwater is to breathe c. Deeply and slowly

Question 35

My body responds to anxiety with increase breathing but slow breathing helps reduce anxiety. T/F?

Answer 35

My body responds to anxiety with increase breathing but slow breathing helps reduce anxiety. T/F? True

Question 36

Which of the following are among the breathing rules I follow as a diver?(Choose all that apply) a. Breathe continuously and never, ever, hold my breath. b. Breathe slowly and deeply c. Do not allow myself to get winded or out-of-breath d. If face with a problem, stop, then maintain or restore slow, deep breathing.

Answer 36

Which of the following are among the breathing rules I follow as a diver?(Choose all that apply) a. Breathe continuously and never, ever, hold my breath. b. Breathe slowly and deeply c. Do not allow myself to get winded or out-of-breath d. If face with a problem, stop, then maintain or restore slow, deep breathing.

Question 37

Buoyancy is a force that pushes an object in water upward. T/F?

Answer 37

Buoyancy is a force that pushes an object in water upward. T/F? True

Question 38

My sunglasses case falls out of my pocket into the water , but fortunately, it floats so I retrieve it. I would say that m sunglasses case is ___ buoyant. a. Positively b. Negatively c. neutrally

Answer 38

My sunglasses case falls out of my pocket into the water , but fortunately, it floats so I retrieve it. I would say that m sunglasses case is ___ buoyant. a. Positively

Question 39

Salt water causes more buoyancy than fresh water because it is less dense and weighs less. T/F?

Answer 39

Salt water causes more buoyancy than fresh water because it is less dense and weighs less. T/F? False. Salt water causes more buoyancy because it is more dense and weighs more; buoyancy results from the weight of the water displaced.

Question 40

To control my buoyancy, normally I will use my weight system and my a. Fins b. Scuba cylinder c. Wet suit d. BCD

Answer 40

To control my buoyancy, normally I will use my weight system and my d. BCD

Question 41

When I descend, my buoyancy tends to ____. When I ascend, it tends to ___. a. Increase, increase b. Increase decrease c. Decrease, increase d. Decrease, decrease

Answer 41

When I descend, my buoyancy tends to ____. When I ascend, it tends to ___. c. Decrease, increase

Question 42

Underwater, when I inhale, my buoyancy a. decreases slightly b. increases slightly c. Doesn’t change

Answer 42

Underwater, when I inhale, my buoyancy b. increases slightly

Question 43

It is important to master buoyancy control because it affects almost everything I do in and underwater. T/F?

Answer 43

It is important to master buoyancy control because it affects almost everything I do in and underwater. T/F? True

Question 44

In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits. T/F?

Answer 44

In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits. T/F? True

Question 45

Overall benefits of the buddy system include(choose all that apply): a. Practicality b. Safety c. fun

Answer 45

Overall benefits of the buddy system include(choose all that apply): a. Practicality b. Safety c. fun

Question 46

The three most important considerations in choosing scuba equipment are suitability, fit and ___ a. Cost and features b. Color and style c. Manufacturer d. comfort

Answer 46

The three most important considerations in choosing scuba equipment are suitability, fit and ___ d. comfort

Question 47

Getting the service my gear needs may be a consideration when choosing equipment. T/F?

Answer 47

Getting the service my gear needs may be a consideration when choosing equipment. T/F? True

Question 48

Before each use, I should ____ my equipment. a. Inspect b. Wash c. Warm d. dry

Answer 48

Before each use, I should ____ my equipment. | a. Inspect

Question 49

I need a mask because a. I will inhale without it. b. my eyes must be in air to focus.

Answer 49

I need a mask because b. my eyes must be in air to focus.

Question 50

My mask enclose my nose so I can a. equalize the mask b. suck the mask into place

Answer 50

My mask enclose my nose so I can | a. equalize the mask

Question 51

From among masks that fit me, I should choose a mask that fits as far away from my face as possible. T/F?

Answer 51

From among masks that fit me, I should choose a mask that fits as far away from my face as possible. T/F? False. Choose a low profile that sits as close to your face as possible.

Question 52

I want to adjust my mask so the strap rests a. Below my ears, above the neck b. over my ears, below the crown of my head c. above my ears, over the crown of my head

Answer 52

I want to adjust my mask so the strap rests c. above my ears, over the crown of my head

Question 53

Snorkels are a standard equipment for scuba diving because they allow me to breathe with my face in the water, or in rough conditions, without wasting my scuba air, especially when I have little scuba air remaining. T/F?

Answer 53

Snorkels are a standard equipment for scuba diving because they allow me to breathe with my face in the water, or in rough conditions, without wasting my scuba air, especially when I have little scuba air remaining. T/F? True

Question 54

Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use. T/F?

Answer 54

Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use. T/F? True

Question 55

When my snorkel is in my mouth, the tip should be a. above my forehead b. over the crown of my head c. at the base of my skull

Answer 55

When my snorkel is in my mouth, the tip should be b. over the crown of my head

Question 56

Fins provide a large surface area so my legs can push against the water effectively. T/F?

Answer 56

Fins provide a large surface area so my legs can push against the water effectively. T/F? True

Question 57

The two basic fin styles are ____ fins. a. large blade and small blade b. freshwater and marine c. vented and split d. adjustable and full-footed

Answer 57

The two basic fin styles are ____ fins. d. adjustable and full-footed

Question 58

My primary considerations when choose fins are fit and a. blade size b. Material c. Splits d. vents

Answer 58

My primary considerations when choose fins are fit and | a. blade size

Question 59

To prepare adjustable fins, I should adjust the straps wearing my wetsuit boots. T/F?

Answer 59

To prepare adjustable fins, I should adjust the straps wearing my wetsuit boots. T/F? True

Question 60

There's no real benefit to choosing the components of my scuba kit as an integrated package. T/F?

Answer 60

There's no real benefit to choosing the components of my scuba kit as an integrated package. T/F? False. Although the components are generally interchangeable, choosing your scuba kit as a package helps you best meet your preferences.

Question 61

The LPI mechanism inflates the BCD with air from my scuba cylinder. T/F?

Answer 61

The LPI mechanism inflates the BCD with air from my scuba cylinder. T/F? True

Question 62

My BCD should have adequate capacity to easily float my equipment and me at the surface. T/F?

Answer 62

My BCD should have adequate capacity to easily float my equipment and me at the surface. T/F? True

Question 63

My BCD should fit a. very tightly and restrict breathing when fully inflated b. fit snugly but not restrict breathing when fully inflated

Answer 63

My BCD should fit b. fit snugly but not restrict breathing when fully inflated

Question 64

My buddy is rinsing a BCD and partially fills the bladder with water. Is this consistent with recommended BCD care? Y/N?

Answer 64

My buddy is rinsing a BCD and partially fills the bladder with water. Is this consistent with recommended BCD care? Y/N? Yes

Question 65

The most important consideration when choosing a regulator is a. Ease of breathing b. Color c. dive/predive switch d. Adjustable second stage

Answer 65

The most important consideration when choosing a regulator is a. Ease of breathing

Question 66

When choosing an alternate air source, a primary consideration involves deciding a. Whether to let it dangle b. Where to secure c. Between independence and simplicity d. Whether you really need one

Answer 66

When choosing an alternate air source, a primary consideration involves deciding c. Between independence and simplicity

Question 67

My SPG is always part of my dive. T/F?

Answer 67

My SPG is always part of my dive. T/F? | False. Your SPG may be an independent instrument or it may be integrated into your dive computer.

Question 68

My local dive pro will usually set up my regulator components. T/F?

Answer 68

My local dive pro will usually set up my regulator components. T/F? True

Question 69

When setting up and wearing my kit, the alternate air source a. Dangles on either side b. Secures in the triangle formed by my hips and chin c. Goes in a pocket on my left d. Goes in a pocket on my right

Answer 69

When setting up and wearing my kit, the alternate air source b. Secures in the triangle formed by my hips and chin

Question 70

Regulators need periopdic overhauls, typically every year or two years. T/F?

Answer 70

Regulators need periopdic overhauls, typically every year or two years. T/F? True

Question 71

The ____ is a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail. a. DIN valve b. Burst disk c. Cylinder alloy

Answer 71

The ____ is a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail. b. Burst disk

Question 72

A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure. T/F?

Answer 72

A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure. T/F? False. A cylinder’s capacity depends upon both its working pressure and its internal capacity.

Question 73

I’m renting a scuba cylinder at a dive resort. Among the cylinders for hire, some have green and yellow bands that read “Nitrox.” As a PADI Open Water Diver with no other training or instructor supervision, am I qualified to use one of these cylinders? a. Yes b. No

Answer 73

I’m renting a scuba cylinder at a dive resort. Among the cylinders for hire, some have green and yellow bands that read “Nitrox.” As a PADI Open Water Diver with no other training or instructor supervision, am I qualified to use one of these cylinders? b. No

Question 74

I bring a cylinder aboard a dive boat in preparation for a trip out to a nearby reef. The normal procedure would be a. Stand the cylinder on the deck b. Lay the cylinder on the deck c. Secure the cylinder in a rack

Answer 74

I bring a cylinder aboard a dive boat in preparation for a trip out to a nearby reef. The normal procedure would be c. Secure the cylinder in a rack

Question 75

Scuba cylinders require pressure testing ___ and visual inspection ___. a. Annually, annually b. Annually, every 2-5 years c. Every 2-5 years, annually d. Every 2-5 years, every 2-5 years

Answer 75

Scuba cylinders require pressure testing ___ and visual inspection ___. c. Every 2-5 years, annually

Question 76

I should have my scuba cylinder filled a. From any compressed air source b. With pure oxygen c. With pure nitrogen d. Only by reputable scuba air stations

Answer 76

I should have my scuba cylinder filled d. Only by reputable scuba air stations

Question 77

The most important feature in my weight system is its a. Comfort b. Quick release c. Size d. trim

Answer 77

The most important feature in my weight system is its b. Quick release

Question 78

I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight. T/F?

Answer 78

I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight. T/F? True

Question 79

Trim means having the right ___ of weight. a. Distribution b. Amount c. shape

Answer 79

Trim means having the right ___ of weight. | a. Distribution

Question 80

One reason for wearing more than one weight system is that is sometimes easier than handling a single, heavier one. T/F?

Answer 80

One reason for wearing more than one weight system is that is sometimes easier than handling a single, heavier one. T/F? True

Question 81

Accessory weights a. Must have quick releases b. Can help you adjust your trim c. Require special training

Answer 81

Accessory weights b. Can help you adjust your trim

Question 82

BCD stands for ___

Answer 82

BCD stands for ___ | Buoyancy Control Device

Question 83

The regulator performs what function?

Answer 83

The regulator performs what function? | Delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into the water.

Question 84

The cylinder performs what function?

Answer 84

The cylinder performs what function? | Holds the high-pressure breathing air supplied by your regulator during the dive.

Question 85

The weight system performs what function?

Answer 85

The weight system performs what function? Holds lead weight to counteract the positive buoyancy of your body and some of your equipment, with a mechanism for dropping some or all the weight in an emergency.