SDI Open Water Scuba Diver Exam

Objects under water appear - Answer-Closer and larger than they do on land How much faster does sound travel in water, compared to air? - Answer-4 times Water conducts heat away from your body - Answer-25 times faster than air does As you descend - Answer-colors fade, reds and oranges fade first, 30 meters seem blue and gray water temp does your body need thermal protection - Answer-86 degrees What does SCUBA mean - Answer-self-contained underwater breathing apparatus When water stratifies itself into layers, according to temperature, the boundary between layers is known as a(n): 1: Halocline. 2: Ichtyocline. 3: Thermodyne. 4: Thermocline. - Answer-Thermocline What is the primary cause of waves? - Answer-wind Which of the following factors do we take into account when measuring waves? - Answer-Height, Length Which of the following is incorrect? - Answer-Waves are not hazardous to divers during shore dives The consequences of becoming cold under water include the following except - Answer-improved judgment and coordination Because sound travels faster under water: - Answer-Its harder to determine the direction from which a sound is coming Entering through surf requires special skills. These skills are often included in beginning scuba course taught in areas in which surf entries are common - Answer-true which of the following are true - Answer-Surge is the back-and-forth movement of water caused by passing over head