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IDC Practice Test - Physics Exam 1
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Questions in this quiz (20)
1The air in your cylinder was accidentally mixed with 0.5% carbon monoxide. If you took this to 20 meters/66 feet, what would the surface equivalent percentage be?
- A0.5%
- B1.0%
- C1.5%
- D5%
2What is the gauge pressure at a depth of 34 meters/112 feet of freshwater?
- A3.3 atm / 48.4 psi
- B3.4 atm / 49.8 psi
- C4.3 atm / 63.1 psi
- D4.4 atm / 64.5 psi
3When viewed underwater, objects normally appear __________ due to __________.
- ACloser; refraction
- BFarther way; visual reversal
- CLarger; turbidity
- DSmaller; conduction
4In technical diving, decompression stops are planned so the diver doesn't end up with ___________ that result in decompression sickness.
- Atoo low a partial pressure of nitrogen
- Ban excessive gas pressure gradient
- Can emergency ascent
- Dtoo high an oxygen gas tension
5If you take a full breath from your cylinder at 20 meters/66 feet, you're inhaling ________ the number of air molecules as a full breath at the surface. Therefore, your gas supply will last _______ as long as using the same cylinder at the surface.
- Atwice; half
- Bthree times; three times
- Cone third; one third
- Dthree times; one third
6If a diver has consumed 100 bar/1400 psi after spending 10 minutes at 30 meters/99 feet, approximately how much gas will he consume at 10 meters/33 feet if he spends 15, minutes there (assuming all other factors remain the same)?
- A37.5 bar / 525 psi
- B75 bar / 1050 psi
- C100 bar / 1400 psi
- D300 bar / 4200 psi
7If a full scuba cylinder is left outside on a hot, sunny day
- Athe pressure will increase and the volume will remain the same.
- Bthe pressure will decrease and the volume will remain the same.
- Cthe pressure won't change, but the volume will increase.
- Dthe pressure will decrease and the burst disc may blow.
8The force of buoyancy is predicted by ________ and is an __________ force exerted on an object placed in fluid.
- ABoyle's Law; upward
- BHaldane's Principle; equal
- CDalton's Law; equal
- DArchimedes' Principle; upward
9Why do you need more weight diving in the ocean than in a freshwater lake, even when you are wearing the same equipment?
- AFresh water is usually colder
- BThe ocean has more waves
- CSalt water weighs more for a given volume
- DFresh water is more genes
10Water is able to conduct heat more efficiently than air because
- Athe molecules flow more smoothly than air.
- Bit is denser than air.
- Cit is less dense than air.
- Dthe molecules are more fluid than air.
11Your dive boat bumps into a large box floating just under the surface of a freshwater lake. After bringing it aboard, you determine the weight to be 75 kilograms/165 pounds. How much water does it displace?
- A75 liters/2.64 cubic feet
- BMore than 77 liters/2.80 cubic feet
- C72.81 liters/2.57 cubic feet
- DLess than 71 liters/2.50 cubic feet
12If it takes a diver 90 minutes to breathe all the air from a scuba cylinder at the surface, approximately how long will the air in that cylinder last at 20 meters/66 feet of sea water if all other conditions remain the same?
- A45 minutes
- B30 minutes
- C18 minutes
- D15 minutes
13During a wall dive in the ocean, you release a balloon at a depth of 24 meters/80 feet. The balloon contains one liter of air. What is the balloon's volume at the surface?
- A1.0 liters
- B2.4 liters
- C3.4 liters
- D4.0 liters
14Sound results from vibration, so the _______ the medium, the more easily sound is transmitted. This is why sound travels ________ times faster in water than air.
- Afaster; 20
- Bcolder; two
- Cdenser; four
- Dwarmer; eight
15If an object weighing 150 kilograms/330 pounds is neutrally buoyant in salt water, what is the volume of the water the object displaces?
- A75 liters / 2.64 cubic feet
- B146 liters / 5.16 cubic feet
- C150 liters / 5.29 cubic feet
- D155 liters / 5.40 cubic feet
16Approximately how much air must be pumped down from the surface to fill a 40-liter/1.4-cubic feet container if the container lies in 20 meters/66 feet of sea water?
- A40 liters / 1.4 cubic feet
- B80 liters / 2.8 cubic feet
- C120 liters / 4.2 cubic feet
- D160 liters / 5.6 cubic feet
17If a diver weighing 75 kilograms/165 pounds is neutrally buoyant in fresh water, the same diver with the same equipment would ____________ in salt water.
- Afloat
- Bsink
- Cremain neutral
- Dbob up and down wildly
18You and your buddy are each diving an enriched air cylinder with 27 percent oxygen and 73 percent nitrogen. On a wreck dive at 20 meters/66 feet in the ocean, what is the partial pressure of oxygen?
- A0.80 ata
- B0.81 ata
- C0.84 ata
- D0.86 ata
19Which of the following can resist the transmission of sound underwater?
- AThermocline
- BClear visibility
- CWaves
- DRebreathers
20A 200-kilogram/440-pound anchor that displaces 127 liters/4.5 cubic feet of water lies on the sea floor in 17 meters/56 feet. What is the minimum amount of water that must be displaced from a lifting device to bring the anchor to the surface?
- A67 liters / 2.38 cubic feet
- B69 liters / 2.43 cubic feet
- C73 liters / 2.55 cubic feet
- D127 liters / 4.5 cubic feet
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- IDC IDC Quiz on IDC Practice Test - Physics Exam 1, created by Mykala Noel on 03/02/2022.
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- Mykala Noel
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