Revision Questions - Set 6 - Physics/Physiology/Equipment Question Title * 1. Underwater turbidity can cause objects to look further away than they really are. This phenomenon is called _____ Inverse refraction Counter contract Visual reversal Refraction OK Question Title * 2. A scuba tank containing 2.0% carbon monoxide is taken to a depth of 35 meters in sea water. If a diver were to breathe from the tank at this depth it would have the same effect as breathing ______ % carbon monoxide at the surface 2% 6% 8% 9% OK Question Title * 3. At a depth of 26 meters in fresh water the absolute pressure is _____, the gauge pressure is _____ and the ambient pressure is _____ 2.52ata / 3.52ata / 2.52ata 3.52ata / 2.52ata / 3.52ata 3.52ata / 2.52ata / 2.52ata 3.6ata / 2.6ata / 3.6ata OK Question Title * 4. Silent bubbles are Bubbles that accumulate under the skin and cause subcutaneous emphysema Bubbles found anywhere a barotrauma occurs Small bubbles in the bloodstream after a dive that do not display symptoms of DCS Bubble that interfere with nerve transmission and cause narcosis OK Question Title * 5. If the blood did not contain haemoglobin, the blood would have to circulate how many times faster to keep up with the body’s demand for oxygen 200-300 4-8 15-20 50-70 OK Question Title * 6. Factors that influence a diver’s susceptibility to decompression sickness include Fatigue Obesity Consuming alcohol before/after a dive All of the above OK Question Title * 7. A scuba tank should have a ______ periodically as required by local law to test its structural integrity and a ______ at least once a year Visual inspection / hydrostatic test Hydrostatic test / visual inspection New valve installed / visual inspection New O-Ring installed / complete valve overhaul OK Question Title * 8. The general guideline for handling a dive computer failure while underwater is to Ascend to 5 meters and make a long safety stop, perhaps lasting as long as your air supply allows Surface immediately and monitor yourself for signs of decompression illness Continue the dive at a shallower depth using your buddy’s computer Write down the information you recall getting from the computer before the failure and continue the dive at a shallower depth OK Question Title * 9. An alternate air source should be placed: On a hose that is at least 30 cm longer than the primary hose Only on the divers left side In the triangular area between chin and the lower corners of the rib cage All of the above are correct OK Question Title * 10. Name OK DONE