Revision Questions 4 IDC Revision Questions Set 4 OK Question Title * 1. As Depth increases underwater, colours disappear due to the waters ability to ___________ light. The first colour to disappear is_________. Diffuse / Blue Absorb / Red Refract / Red Bend / White OK Question Title * 2. If an object that weighs 85kg is neutrally buoyant in salt water, what is the volume of the water the object displaces? 8.5 litres 82.5 litres 87.5 litres 170 litres OK Question Title * 3. How many times better does water conduct heat than air? 10 24 20 4 OK Question Title * 4. What is the ambient pressure at 22mfw (meters fresh water)? 3.2 bar 2.2 bar 2.14 3.14 OK Question Title * 5. Which of the following is not a recommendation for dealing with a diver suspected of having decompression illness? Keep the diver moving, do not allow him to fall asleep Administer oxygen Place on the left side down, head supported position Transport to the nearest medical facility OK Question Title * 6. A diver experiencing gas narcosis may display which of the following? Foolish behavior as if intoxicated Cherry red lips and fingernail beds Headache, nausea and perhaps unconsciousness All the above are correct OK Question Title * 7. If a diver displays dizziness, difficulty breathing, paralysis or unconsciousness almost immediately upon surfacing from a dive, you may suspect Decompression sickness A lung over expansion injury Oxygen toxicity Overexertion OK Question Title * 8. A diver who ruptures an ear drum while diving in cold water may experience _____________ A squeeze Vertigo Tunnel Vision Euphoria OK Question Title * 9. The ______________ is the part most affected by changes in pressure Middle ear Outer ear Inner ear Ear Lobe OK Question Title * 10. Name OK DONE