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PADI Divemaster and IDC Practice Tests > Physics Quiz > Flashcards

Physics Quiz Flashcards

1
Q

Make sure you can write down these tables from memory:

Saltwater: (Fresh water add 1 ft)
Depth Absolute Volume Density
Pressure
0 m/0 ft 1 ATA 1 x 1
10 m/33 ft 2 ATA 1/2 x 2
20 m/66 ft 3 ATA 1/3 x 3
30 m/99 ft 4 ATA 1/4 x 4
40 m/132ft 5 ATA 1/5 x 5

METRIC:
One liter of seawater weighs 1.03 kg
One liter of fresh water weighs 1.00 kg
10 meters of seawater = 1 atm
10.3 meters of fresh water = 1 atm
Pressure changes .100 atm/meter in salt water
Pressure changes .097 atm/meter in fresh water

IMPERIAL:
One cubic foot of seawater weighs 64 pounds
One cubic foot of fresh water weighs 62.4 pounds
33 feet of seawater = 1 atm
34 feet of fresh water = 1 atm
Pressure changes .445 psi/foot in salt water
Pressure changes .432 psi/foot in fresh water

A

seriously, memoized these for your IE, you won’t be able to use your notes for the text…

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2
Q

Megan is diving with a 100 cf scuba cylinder. She is on the deck of the Duane at a depth of 30m/99 feet salt water. Her new air integrated computer tells her that her air consumption rate is 3 bar/44psi per minute. Megan is going for the sand at a depth of 40m/132 feet. What will her air consumption rate be at this depth? Her activity level will be the same at both depths.

6bar/11 psi per minute

3.75bar/55 psi per minute

4bar/44 psi per minute

3.25bar/33 psi per minute

A

3.75bar/55 psi per minute

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3
Q

You and your Buddy are diving on the wreck of the Duane at a depth of 30m/100 feet, salt water. What is your gauge pressure

3 atm/ 44.5 psig

4 atm/ 59.2 psig

  1. 9 atm/ 42.72 psig
  2. 5 atm/ 51.85 psig
A

3 atm/ 44.5 psig

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4
Q

A scuba cylinder is filled to 200 bar/3000 psi at room temperature. Describe what would happen to the volume of this cylinder if it was taken on an ice dive.

The volume would increase

The volume would decrease

The volume would not change but the pressure would decrease

The volume and pressure would remain unchanged

A

The volume would not change but the pressure would decrease

Remember that you have not added anything to the tank and the tank is not flexible

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5
Q

During a recent dive on French Reef (salt water) you discovered a Spanish anchor that weights 129K/285 lbs. It displaces 57L/2cf of water. Your plan is to lift the anchor by use of a lift bag. How many cubic feet of air must be pumped into the lift bag to make the anchor neutral?

68.2L/2.45cf

39L/1.45cf

  1. 3L/1.32cf
  2. 3L/2cf
A

68.2L/2.45cf

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6
Q

A telephone pole has been blown into your favorite fresh water quarry. This pole weighs 182K/407lb and and displaces 45L/3cf. How much water will have to be displaced from out lift bag to make the poll neutral and bring it back up?

135.6L/3.3cf

137L/3.5cf

133L/2.4cf

120L/2.3cf

A

137L/3.5cf

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7
Q

What is the partial pressure of the gasses in a 30% Nitrox mix at 23m/78ft salt water.

PO2=2ata PN=3.35ata

PO2=2.35ata PN=1.00ata

PO2=.70ata PN=1.65ata

PO2=1 ata PN=2.35 ata

A

PO2=1 ata PN=2.35 ata

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8
Q

Megan’s scuba cylinder is comprised of 30% oxygen and 70% nitrogen. On the Duane, at 30m/99 feet, what is the partial pressure of nitrogen?

  1. 4 ata
  2. 6 ata
  3. 8 ata

3 ata

A

2.8 ata

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9
Q

The visibility on your dive is poor. This is due to turbidity. Many small particles suspended in the water are making the water look cloudy. This phenomenon is called_________________ and it makes objects appear to be______________.

refraction/ farther away

density/ father away

visual reversal/ closer

visual reversal/ father away

A

visual reversal/ father away

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10
Q

Megan has a balloon with a volume of 270 liters/9 cubic feet at 17 meters/58ft. She wants to bring it down to the sand of the Spiegel at 40 meters/132 feet. What would the balloon’s new volume be?

115 liters/3.95 cu.ft.

151 liters/5.02 cu.ft.

146 liters/4.86 cu.ft

180 liters/6 cu.ft.

A

146 liters/4.86 cu.ft

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11
Q

If you have a 360 liter/12 cubic foot flexible container at 10.3 meters/34 feet fresh water, what happens to the volume if the container is taken to a depth 31 meters/102 feet?

the volume is 60 liters/2 cubic feet

the volume is 120 liters/4 cubic feet

the volume is 180 liters/6 cubic feet

the volume is unchanged

A

the volume is 180 liters/6 cubic feet

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12
Q

What is the minimum amount of water that must be displaced to bring a 1360K/3000lb car to the surface if the car displaces 764L/27cft? The car lies at 89 feet of salt water.

  1. 1L/23.7cf
  2. 3L/21.3cf
  3. 4L/19.9cf

534L/18.4cf

A

556.4L/19.9cf

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13
Q

What is the minimum amount of water that must be displaced to bring a 1360K/3000lb car to the surface if the car displaces 764L/27cft? The car lies at 89 feet of salt water.

  1. 1L/23.7cf
  2. 3L/21.3cf
  3. 4L/19.9cf

534L/18.4cf

A

556.4L/19.9cf

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14
Q

An object displaces 25L/7.10 cf of fresh water, the object is 75K/100lb positively buoyant. How much weight in lead pellets must be added to the object to make it neutral? Ignore the volume of the lead?

77.4K/104lb

75k/100lb

250k/452 lbs.

the answer cannot be determined with the data provided

A

75k/100lb

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15
Q

You are diving a 32% blend of Nitrox. What is the partial pressure of the Oxygen in your mix, at a depth of 26m/85 feet salt water?

32 ata

  1. 15 ata
  2. 4 ata
  3. 2 ata
A

1.15 ata

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16
Q

How much air must be added to a lifting bag to bring a 225 kg/500 pound anchor to the surface? The object lies at 9 meters/30 feet of water near Fire Coral Cave on Molasses Reef.

492.2 cubic feet

500 cubic feet

503.7 cubic feet

the answer cannot be determined because there is no displacement

A

the answer cannot be determined because there is no displacement

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17
Q

At Crystal River you plan to dive to a depth of 12.6m/41 feet, fresh water. What will be the absolute pressure?

  1. 2 atm/ 17.7 psia
  2. 2 atm/ 32.4 psia

2 atm/ 29.4 psia

3 atm/ 44.5 psia

A

2.2 atm/ 32.4 psia

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18
Q

Water has a much higher heat _____________than air. This is why water conducts heat away from the body, __________times more rapidly than air.

capacity, 4

signature, 20

conduction, 4

capacity, 20

A

capacity, 20

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19
Q

Nikki releases a balloon on The North Star with a volume of 300 liters/10 cubic feet from 10 meters/33 feet, given that it does not explode, what would the balloon’s new volume be at the surface?

  1. 9 ft³
  2. 2 ft³
  3. 7 ft³

20 ft³

A

20 ft³

20
Q

The new intern at Rainbow Reef is working the nitrox machine for the first time. He fills a cylinder with a blend of: 30% oxygen and 70% nitrogen. At an ambient pressure of 1ata what is the partial pressure of oxygen?

.3 ata

.5 ata

.7 ata

.9 ata

A

.3 ata

21
Q

There is a 30 liter/30 cubic foot section of pipe located at a depth of 31 meters/102 feet in a fresh water lake. The pipe is sealed so we are going to pump air down from the surface and fill the pipe. How much air must be pumped down from the surface to fill the pipe?

90

30

60

120

A

120

22
Q

If an object is neutrally buoyant in salt water, it will ____________ when placed in _____________________water

sink/ fresh

float/ fresh

be neutral/pool

the answer can not be determined from this information.

A

sink/ fresh

23
Q

What is the maximum oxygen partial pressure limit for enriched air diving? ________________.

  1. 6 ata
  2. 4 ata
  3. 1 ata

both a and b

A

1.6 ata

This is the maximum contingency limit, conservative guideline is 1.4 ATA

24
Q

A tractor weighing 340k/750lb and displacing 125L/5cu.ft. is lying in 14 meters/45 feet of fresh water. How much water must be displaced to lift this object?

340 liters/ 12 cu.ft.

209.2 liters/ 4.8 cu.ft.

125 liters/ 5 cu.ft.

215 liters/ 7 cu.ft.

A

215 liters/ 7 cu.ft.

25
Q

Lindsey’s scuba cylinder is comprised of 27% oxygen and 73% nitrogen. On the Bibb, at 20m/67 feet, what is the partial pressure of oxygen?

.8 ata

.81 ata

.84 ata

.86 ata

A

.81 ata

26
Q

You are diving Lake Tahoe at an elevation of 3,000m/10,000 ft. The ambient air pressure is 0.7 ata. The dive shop issued you a tank of enriched air 36%. What is the partial pressure of the Oxygen in the mix as you wade into the lake?

.45 ata

.25 ata

.36 ata

the answer cannot be determined with the information provided

A

.25 ata

27
Q

A sealed flexible container with 10 liters/10 cubic feet of air in it is submerged to a depth of 25 meters/82 feet in the ocean. Providing there is no temperature change in the water between the surface and at 25 meters/82 feet, what is the new volume in the container at 25 meters/82 feet?

  1. 87
  2. 38
  3. 87
  4. 87
A

2.87

28
Q

The absolute pressure at 22.7m/75 feet of sea water is:

  1. 27 ata/38.07 psi
  2. 27 ata/48.07 psi
  3. 27ata/48.07 psi
  4. 97 ata/ 50.0 psi
A

3.27 ata/48.07 psi

29
Q

Megan and Christy want to recover and lift a 172K/380lb (dry weight) anchor from the bottom of the ocean. The anchor displaces 85L/3cf of sea water. The bottom composition is flat and firm. How many lift bags, rated for 22K/50lb of lift each, will it take to recover (lift) the anchor?

4 bags

3 bags

5 bags

6 bags

A

4 bags

30
Q

As you continue your dive on the Duane at 31Mm102 ft salt water, you notice that colors are not as bright. This is due to waters ability to refract light.

True

False

A

False

absorption

31
Q

If you have a 360 liter/12 cubic foot flexible container at 10.3 meters/34 feet fresh water, what happens to the volume if the container is taken to a depth 31 meters/102 feet?

the volume is 60 liters/2 cubic feet

the volume is 120 liters/4 cubic feet

the volume is 180 liters/6 cubic feet

the volume is unchanged

A

the volume is 180 liters/6 cubic feet

32
Q

On Conch Wall, at a depth of 24m/80 feet salt water, you decide to blow up a balloon. Your balloon contains 1 liter of air at this depth. After you release the balloon, it soon reaches the surface. What is the balloons volume at the surface?

2.4

4

1

3.4

A

3.4

33
Q

Your scuba tank has been filled at Bubba’s Dive Center with a pure Gas. The mixture contains 3.5% carbon monoxide. Not realizing this, you decide to dive the Spiegel to the sand hitting a depth of 40m/132 feet. Breathing from your tank at this depth, will have the same effect as breathing what________________ percent of carbon monoxide at the surface?

  1. 5%
  2. 5%

14%

4.5%

A

17.5%

34
Q

The deeper you dive, the first color to become washed out and faded is?

Yellow

Blue

Red

all fade equally at the same depth

A

Red

35
Q

If a diver has a Surface Air Consumption rate of 2 bar/30 psi per minute with an 80 cubic foot cylinder, what will be his air consumption rate at 27m/90ft of sea water?

9 bar/120 psi per minute

8 bar/99 psi per minute

7.4bar/111 psi per minute

6bar/60 psi per minute

A

7.4bar/111 psi per minute

36
Q

Christy releases a balloon on Molasses Deep with a volume of 90 liters/3 cubic feet from 17 meters/58ft, given that it does not explode, what would the balloon’s new volume be at 8 meters/27ft?

135 liters/4.55 cu.ft.

120 liters/4 cu.ft.

105 liters/3.55 cu.ft.

150 liters/5 cu.ft.

A

135 liters/4.55 cu.ft.

37
Q

If a balloon is filled with air at 24 degrees C/80 degrees F. Then placed outdoors in some Oceanless, near freezing temperature, what will happen.

The volume of the balloon will decrease

The volume of the balloon will increase

The temperature of the balloon will decrease as the volume remains unchanged

There will be no changes.

A

The volume of the balloon will decrease

because it is a flexible container, if it was a tank only the pressure would reduce

38
Q

The dive boat has just bumped into a safe floating neutrally in the lake. The Captain has determined the weight of this box to be 75k/165lb. What is the volume of water the object displaces?

75L/2.64cf

  1. 4L/10cf
  2. 8L/2.57cf

the answer can not be determined with this information

A

75L/2.64cf

39
Q

Becky is teaching an AOW class and to help her students understand pressure she has a balloon that she takes to depth. The balloon’s volume is 60 liters/2 cubic feet at the surface. If Becky was to bring this balloon to the Spiegel at 30m/99ft, what would the balloon’s new volume be?

15 liters/.5 cu.ft.

18 liters/.6 cu.ft.

21 liters/.7 cu.ft.

24 liters/.8 cu.ft.

A

15 liters/.5 cu.ft.

40
Q

A gas mixture is comprised of 23% oxygen, 75% nitrogen and 2% carbon dioxide. At a depth of 10m/33 feet of seawater, what is the partial pressure of the nitrogen?

1 ata

  1. 3 ata
  2. 5 ata
  3. 7 ata
A

1.5 ata

41
Q

You are still on the Duane at a depth of 30m/99ft salt water. What is your pressure in atmosphere absolute?

3 atm/ 44.5 psia

4 atm/ 59.2 psia

2 atm/ 29.4 psia

3.5 atm/ 51.85 psia

A

4 atm/ 59.2 psia

42
Q

The ambient pressure surrounding a liquid filled open container is increased. This liquid is the mixture for a soft drink. As the pressure increases what happens to the gas (carbon dioxide) that is contact with the soft drink.

Dissipates

dissolves into the soft drink until reaching equilibrium

remain unchanged

since the gas is carbon dioxide, this will not work

A

dissolves into the soft drink until reaching equilibrium

43
Q

How much water must be displaced to bring a 453.5K/1,000lb dead elephant to the surface if the elephant displaces 254.8L/9cft? The elephant died of natural causes and lies at 132 feet of salt water.

  1. 2L/7cf
  2. 1L/6.9cf
  3. 5L/6.6cf

The answer cannot be determined because the depth exceeds recreational standards

A

185.5L/6.6cf

44
Q

A balloon is filled with 90 liters/3 cubic feet of air at room temperature. Describe what would happen to that balloon if it were put into a freezer at a constant ambient pressure.

The volume would increase

The volume would decrease

The volume would remain constant

There is no way to determine what would happen to the volume

A

The volume would decrease

45
Q

One way that heat loss occurs during diving activity is through:

conduction

convention

convection

collusion

A

conduction

There is some convection, but conduction is the primary method for heat loss in water

46
Q

Shark diving off Bimini, the lines attached to the 453K/1000lb shark cage slip, sending the cage to the bottom at a depth of 34m/112ft salt water. Your team has decided to surface the cage. The cage has a volume of 283L/10cf. A cage of this size will require how many cubic feet of air pumped into an attached lift bag for the cage to become neutral.

  1. 4 liters/ 56 cu.ft
  2. 1 liters/ 6.6 cu.ft.
  3. 8 liters/ 5.6 cu.ft.

165 liters/ 6.3 cu.ft.

A

156.8 liters/ 5.6 cu.ft.

47
Q

What is the difference in weight between 50 litres/3 cubic feet of fresh water and the same volume of sea water?

  1. 5 kilos/4.8 pounds
  2. 5 kilos/3.8 pounds
  3. 2 kilos /4.0 pounds
  4. 2 kilos/5.8 pounds
A

1.5 kilos/4.8 pounds

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