PADI Scuba Diving - Section 2 question n answers graded A+

PADI Scuba Diving - Section 2How does looking at something underwater affect its apparent size? - correct answer Underwater things sometimes appear closer than they really are. How does water affect light intensity and color? - correct answer Light travels at a different speed in water so it shifts it course (refraction) which magnified everything about 33% less light remains as depth increases and the water absorbs each color How does being underwater affect hearing? - correct answer sound travels farther in water than in air and it travels four times faster in water How does the rate of body heat loss in water compare to the rate of body heat loss in air? - correct answer Water conducts heat about 20 times faster than air does, meaning water cools much faster What should you do if you begin to shiver continuously underwater? - correct answer get out of the water immediately, dry off and seek warmth How should you move underwater to compensate for the increased resistance of water? - correct answer moving slowly and steadily. How do you breathe underwater for maximus efficiency? - correct answer breathe slowly and deeply underwater What are eight symptoms of diving overexertion? - correct answer fatigue, labored breathing, a feeling of suffocation, weakness, anxiety, headache, muscle cramping or a tendency to panic How do you prevent diving overexertion? - correct answer know you physical limits, pace yourself, move slowly What should you do if you become overexerted while diving — either at the surface or underwater? - correct answer underwater: stop all activity, breathe deeply and rest, catch your breath, hold onto an object for support, relax until breathing comes back to normal surface: establish buoyancy, stop moving, rest and catch breath, signal for help if necessary, once recovered proceed at slower pace What are three techniques used for airway control? - correct answer 1. Always inhale slowly if water enters the regulator so you don't pull the water into your throat 2. always inhale cautiously and slowly after clearing it 3. use your tongue as a splash guard by putting it on the roof of your mouth when you breathe pat small amounts of water What are two reasons for wearing an exposure suit while diving? - correct answer to reduce heat loss and to protect from stings, scrapes, and abrasions How do dry suits and wet suits insulate divers? - correct answer by putting a layer of insulating foam neoprene over your skin Why must a wet suit fit snugly? - correct answer the body heats water so if it's snugly and fit, the water that first soaks in stays there and gets heated, and if it's not sucky, incoming cold water comes in What two properties may an exposure suit lose due to increased water pressure at depth? - correct answer buoyancy and insulation the deeper you descend What three factories should you consider when selecting an exposure suit? - correct answer warmth/insulation, fit and comfort What four procedures apply to caring for an exposure suit? - correct answer rinse dry inside out store lubricate dry suit zippers periodically