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HOT SHOT DIVER?
We have selected several questions from PADI´s Diving Knowledge Workbook so you can test your knowledge in recreational diving...
Diving Physics
Physiology
Equipment
General Knowledge and the Diving Environment
The Recreational Dive Planner (Dive Tables)
Real Diving Events While Diving in Cozumel. What would you have done?
There are more questions and exercises available in PADI´s Diving Knowledge Workbook. Ask your PADI Dive Center for this wonderful workbook.
If you find a mistake in this questionnaire please contact frankg@bluebubble.com
Diving Physics
1. Divers are unable to determine the direction of sound underwater because:
a. water filling the ear canal reduces the ear´s sensitivity to sound.
b. sound waves travel less efficiently underwater.
c. there is an insufficient delay between the sound striking one ear before the other.
d. the wet suit hood makes it difficult to perceive sound as accurately as on land.
Answer
2. When viewed underwater, objects normally appear _____ by a ratio of about ___ (actual to apparent distance).
a. closer / 2:1
b. further away / 4:3
c. closer / 4:3
d. further away / 2:1
Answer
3. Approximately how much air must be added to a lifting device to bring a 1200 pound object to the surface? The object lies in 100 feet of fresh water.
a. 19 cubic feet
b. 18 cubic feet
c. 16 cubic feet
d. The answer cannot be determined from the data provided
Answer
4. A scuba tank is filled to capacity at the surface. When this tank is used at a depth of 99 feet/30 meters in the sea, the air within the tank is four times more dense than it was at the surface
True
False
Answer
5. A diver has an air consumption rate of 25 psi per minute at the surface. If all factors, but depth remain unchanged, what will his consumption rate be at 132 feet of sea water?
a. 50 psi/minute
b. 75 psi/minute
c. 100 psi/minute
d. 125 psi/minute
Answer
6. A balloon is filled with 1 cubic foot of air at room temperature. Describe what would happen to that balloon if it were put into a freezer at a constant ambient pressure.
a. The volume would increase
b. The volume would decrease
c. The volume would remain unchanged, but the pressure would decrease.
d. The volume and the pressure would remain unchanged
Answer
7. When breathing at depth, the tissues of a diver begin to take on additional gas pressure. If the diver remains at depth long enough, his tissues will again equalize with the ambient pressure.
True
False
Answer
Diving Physiology
1. Oxygen is efficiently transported throughout the body because of a substance called _____, which is contained in the _____.
a. oxidative metabolism / blood
b. plasma / arteries
c. protein / heart
d. hemoglobin / red blood cells
Answer
2. The practice of breathing slowly when scuba diving is important in order to:
a. minimize resistance caused by turbulence in the airways.
b. compensate for the decrease in energy from immersion in cold water.
c. avoid the potential for thoracic squeeze.
d. All of the above are correct.
Answer
3. The reflex respiratory center regulates breathing based primarily on the level of _____ in the blood.
a. oxygen.
b. nitrogen.
c. carbon dioxide.
d. All of the above depending upon circumstance.
Answer
4. Nitrogen narcosis results from:
a. disruptions in the transmissions between nerve cells.
b. extravascular bubble formation in the brain.
c. a severely decreased sensitivity to pain caused by silent bubbles.
d. mechanisms that are completely unknown to science.
Answer
5. Which portion of the ear is most affected by changes in pressure?
a. outer ear.
b. middle ear.
c. inner ear.
d. All areas are equally affected.
Answer
6. Smoking cigarettes prior to diving can raise the carbon monoxide level ____ times above normal, which in turn ______.
a. 2/makes it harder to breath.
b. 3-12/impairs oxygen transport and carbon dioxide elimination.
c. 20-40/increases the risk of a lung-expansion injury.
d. 100/increases the risk of heart attack and stroke.
Answer
7. In terms of the location of symptoms, air embolism is characterized by _____, while decompression sickness is characterized by ________.
a. involvement of the head and neck / involvement of the arms and legs
b. involvement of the respiratory center / involvement of the central nervous system
c. involvement of both sides of the body, either upper or lower / involvement of only one side of the body
d. involvement of only one side of the body / involvement of both sides of the body, either upper or lower
Answer
Diving Equipment
1. A steel tank whose capacity is 71.2 cubic feet at 2475 psi and an aluminum tank whose capacity is 80 cubic feet at 3000 psi are both filled to 2000 psi. Which tank contains more air?
a. The steel tank.
b. The aluminum tank.
c. Both would hold equal amounts.
d. The answer cannot be determined from the information given.
Answer
2. To ensure the structural integrity of a scuba tank, it should be _____ anytime it is _____.
a. destroyed / at an age of twenty years.
b. hydrostatically tested / exposed to temperatures above 180° F.
c. visually inspected / left unused for more than two years.
d. All of the above are correct.
Answer
3. A pilot valve refers to a second-stage design that:
a. uses a small valve to assist the opening of the main valve.
b. directs the air flow more directly to the diver.
c. requires the use of an ultra-high pressure tank.
d. uses a small valve to close the air flow when free-flow occurs.
Answer
4. Fail safe refers to a regulator´s tendency to _____ because of the use of a(n) _____ valve in the second-stage.
a. breathe easily / open circuit.
b. free-flow / downstream.
c. breathe easily / closed circuit.
d. free-flow / upstream.
Answer
5. Two divers may use a single dive computer provided they are careful to remain together and dive the exact same profile.
True
False
Answer
6. In terms of equipment considerations, avoiding the maximum limits of the dive tables is wise because:
a. dive tables are imprecise.
b. it is hard to read dive tables while underwater..
c. depth gauges can malfunction and/or be read inaccurately.
d. you can get nitrogen narcosis more easily.
Answer
General Skills and the Diving Environment
1. When making a Controlled Emergency Swimming Ascent (CESA), the diver should do which of the following in terms of his equipment?
a. Ditch his/her weight belt and remove his/her regulator mouthpiece.
b. Ditch his/her weight belt but retain his/her regulator mouthpiece.
c. Keep all equipment in place and retain his/her regulator.
d. Remove or retain what ever makes the ascent the easiest.
Answer
2. Divers should always wear an amount of weight equal to 10% of their body weight plus 3 pounds.
True
False
Answer
3. You suddenly run out of air at 60 feet. You notice your buddy is approximately 20 feet away and not paying attention to you. What action should you take in this circumstance?
a. Swim to your buddy, get his attention and signal that you are out of air.
b. Swim to your buddy and immediately locate and secure his alternate air source, then signal you are out of air.
c. Make a Controlled Emergency Swimming Ascent.
d. Make a Buoyant Emergency Swimming Ascent.
Answer
4. Although each diver should have a primary light, only one of the two buddies need to have the required backup lights when night diving.
a. True.
b. False.
Answer
5. Special procedures are required when diving at altitude because:
a. the percentage of nitrogen is increased.
b. the percentage of nitrogen is decreased since the ambient pressure is reduced.
c. the partial pressure of nitrogen is increased.
d. the partial pressure of nitrogen is decreased since the ambient pressure is reduced.
Answer
6. You encounter an unconscious diver at the surface. You remove the victim´s weight belt, and attempt to check the victim´s pulse. If unable to detect a pulse, you should immediately begin towing the victim to shore as fast as possible.
a. True.
b. False.
Answer
The Recreational Dive Planner.
You will need your dive tables(Recreational Dive Planner, remember?...) for some questions, and don´t forget to use your R.A.T.
1. The Recreational Dive Planner uses a 60-minute tissue compartment to control its "Surface Interval Credit Table" because:
a. there are no safety factors built into its design.
b. the decompression stops are shorter than the Navy tables.
c. it is a better way to account for individual differences in physiology.
d. if divers do not exceed the NDLs(No decompression Limits) the slow 120-minute compartment can be virtually ignored.
Answer
2. The decompression-related problems encountered when diving at altitude occur because the diver begins his dive:
a. at an atmospheric pressure less than that at sea level.
b. at an atmospheric pressure more than that at sea level.
c. with a reduced percentage of nitrogen than that at sea level.
d. with a reduced percentage of oxygen than that at sea level.
Answer
3. A diver plans a dive to 100 feet for 20 minutes. Losing track of time, he notices that his bottom time is actually 24 minutes. Which of the following procedures should he institute in this situation?
a. Immediately ascent to 15 feet and make a stop for 15 minutes; avoid diving for 24 hours.
b. Immediately ascent to 15 feet and make a stop for 8 minutes; avoid diving for 6 hours.
c. Immediately ascent to 15 feet and make a stop for 3 minutes.
d. Immediately surface, rest, be monitored for signs of decompression sickness, breathe 100% oxygen, and do not dive for at least 24 hours.
Answer
4. A diver is planning a dive to 70 feet for 35 minutes. What is the minimum amount of time the diver would have to spend at the surface if he wished to repeat the exact same profile?:
a. 57 minutes.
b. 2:29 hrs..
c. 2:31hrs.
d. No minimum time.
Answer
5. A diver exits the water at 10:40 A.M. after a dive to 95 feet for 20 minutes. He reenters the water at 12:20 P.M. for a dive to 65 feet for 27 minutes. How soon could the diver reenter the water for a dive to 55 feet for 30 minutes?
a. 44 minutes
b. 41 minutes
c. 22 minutes
d. 37 minutes
Answer
Real Life Situations While Diving in Cozumel.
These are real events that happened to Divemasters and instructors here in Cozumel. What would you have done?
1. 6 divers of different levels and a Divemaster rolled back from a small boat to dive Cedar Pass. As they descended the current was really strong. After 15 minutes into the dive the Divemaster made a turn into a coral swim through passage. As he came out of the passage he notices that he is short of 2 divers. He waits for a couple of minutes and then keeps going on with the current to see if they got ahead. The dive ends and as they surface the divers are not in the boat. 20 minutes later they show up around Santa Rosa Wall. What went wrong?
a. The divers were inexperienced
b. The Divemaster was inexperienced
c. The divers were doing what they pleased
d. The Divemaster should have never entered the passage.
Answer
2. Five experienced divers that have been diving for the first time in Cozumel with the same dive operator insist in going to dive to Santa Rosa Wall warning the dive operator that they may go with a different operator if they do not go there. The dive operator agrees even though the currents in the area have been wild in the last 2 days. After a pre-dive briefing the divers and the Divemaster roll back entry on Santa Rosa Wall. As they approach the wall they are pushed down by a strong downward current. As they descend they notice that their bubbles also are going down instead of up, bringing them to about 170ft. The Divemaster signals them to go up, but no matter how hard they kick they are going nowhere. The Divemaster signals the divers to approach the wall and start climbing with their hands while inflating their BCDs and kicking at the same time. After 15 minutes of hard work the divers and the Divemaster reach the edge of the wall at 40 ft. where they are able to swim toward the island and 0up to the surface where the boat picks them up. What went wrong?
a. The Divemaster did not check the conditions of the site prior to letting divers go down.
b. The Divemaster trusted too much on the diver´s experience.
c. The Divers became not-so-experienced-divers when they insisted on going to a site no matter what.
d. The Dive Operator should have accepted but warned the divers that the decision to go down should be made by the Divemaster after evaluating the conditions.
Answer
PADI RESORT
S-16544