Scuba AFS 270 SDI Midterm Questions and Answers with Complete Solutions

Scuba AFS 270 SDI Midterm Questions and Answers with Complete Solutions objects underwater appear ___ and ___ than they do on land closer and larger As you descend: 1: Colors will remain largely the same. 2: Blues and grays disappear quickly. 3: Dive lights have little effect on apparent color. 4: None of the above. 4 (none of the above) Water conducts heat away from your body ____x as fast as air does 25x When water stratifies itself into layers, according to temperature, the boundary between layers is known as a(n): thermocline Which of the following is/are true? 1: Tides can make the water at a particular dive site noticeably deeper or shallower than you may have experienced previously. 2: Tidal currents can be very strong, making diving difficult or even dangerous. 3: Strong tidal currents can have an adverse effect on visibility. 4: All of the above. 4 (all of the above) Which of the following is/are true? 1: Water conducts heat away from your body ten times faster than air does. 2: Water conducts heat away from your body 25 times faster than air does. 3: Fresh water conducts heat away from your body faster than salt water does. 4: Salt water conducts heat away from your body faster than fresh water does. 2 (Water conducts heat away from your body 25 times faster than air does) The presence of thermoclines means that: 1: Surface temperatures will provide divers with a good indication of what they can expect at depth. 2: Divers may require less in the way of exposure protection at depth than they will at the surface. 3: Divers may require more in the way of exposure protection at depth than they will at the surface. 4: None of the above. 3 (Divers may require more in the way of exposure protection at depth than they will at the surface) Which of the following statements are true? 1: Wave height is the distance from its highest point (crest) to its lowest point (trough). 2: Wave length is the distance from crest to crest. 3: Wave oscillation to calculated by multiplying