OCEAN DIVER KNOWLEDGE REVIEWTHE BODY AND EFFECTS OF DIVING

OCEAN DIVER KNOWLEDGE REVIEW
THE BODY AND EFFECTS OF DIVING

Multiple-choice exercise

Which of the following is recommended dive practice? See Student Workbook p28.
1. Diving with ear plugs.
2. Descending further when pain is felt in the ears.
3. Diving with hay fever or a cold.
4. Aborting the dive if ears will not clear.
The human body contains both flexible and rigid air-filled spaces. Failure to ------------ pressure within the body's air spaces will cause damage to tissues. See Student Workbook pp26-29
1. equalise
2. contain
3. expand
4. reduce
5. increase
Water pressure on the ear drum is equalised by allowing air up the _______ into the middle ear cavity. See Student Workbook p27.
1. Eustachian tube
2. Outer ear
3. Carotid sinus
4. Bronchus
5. Alveoli
If the weight of an object exceeds the upthrust from the water it displaces, it will ______ . See Student Workbook p32.
1. float
2. fly
3. capsize
4. sink
5. swim
It is desirable for a diver to be able to make small up and down changes of depth during the dive by simply breathing in or breathing out. The starting point for this is _______. See Page 34 Student Workbook.
1. negative buoyancy
2. positive buoyancy
3. neutral buoyancy
Sea water is slightly more dense than fresh water. This means that a diver who is neutrally buoyant in fresh water will find himself _______________ buoyant in the sea. See Student Workbook p34.
1. negatively
2. positively
3. neutrally
A _______ is usually necessary to counteract the buoyancy the diver’s body, suit and SCUBA equipment. See Student Workbook p33
1. diving knife
2. weight belt
3. harness
4. SMB
The stimulus to breathe is triggered by the build up and need to expel _______. See Student Workbook p24.
1. Oxygen
2. Nitrogen
3. Carbon dioxide
4. Water
5. Hormones
Which of the following statements about hyperventilation are true? See Student Workbook pp25-26
1. It greatly increases the amount of oxygen in the blood, enabling snorkel divers to stay down longer.
2. It reduces the amount of carbon dioxide in the blood to a low level.
3. A snorkel diver who hyperventilates will be forced to surface by the urge to breathe.
4. A diver who suffers 'shallow water blackout' will float safely to the surface.
5. A breath-hold diver should start the dive in a relaxed state and
  should take no more that two or three medium breaths
6. Hyperventilation before breath hold diving is dangerous
The greatest heat loss from the body is through __________. See Student Workbook p30.
1. The head and face
2. The front of the chest
3. Under the armpits
4. The groin
5. The hands and feet
Below what temperature would most divers require at least a wetsuit for heat insulation? See Student Workbook p30.
1. 35°C
2. 27°C
3. 21°C
4. 15°C
5. 10°C
Which of the following statements about diving suits are correct? See Student Workbook p31.
1. You need to wear strap fins with a drysuit
2. Drysuits are fitted with devices to allow the introduction and expulsion of air
3. Wetsuits should be a loose fit
4. The inside of a drysuit does not require cleaning because it does not get wet
Which of the following can lead to exhaustion while diving? See Student Workbook pp34-35.
1. Failure to attain neutral buoyancy
2. Getting cold
3. Lack of physical fitness
4. Vegetarianism
5. Hangover
6. Relaxation
7. Anxiety
8. Hard finning