SDI Final Review Exam 2024 Questions with 100% Correct Answers | Verified | Latest Update

1. Objects under water appear 60 percent larger than they do on land. ANS true 2. As you descend ANS Colors appear to fade. Reds and oranges are among the first colors to disappear. At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. All of the above. 3. Because sound travels faster under water ANS It is harder to determine the direction from which a sound is coming. 4. Which of the following is/are true? ANS Water conducts heat away from your body 25 times faster than air does. 5. When water stratifies itself into layers, according to temperature, the bound- ary between layers is known as a(n) ANS Thermocline 6. A wave encountering shallow water begins to slow at it bottom, while the top of the wave continues at its previous speed. This causes the wave to break. ANS true 7. Surge is the backwash of water from waves breaking on shore. ANS false 8. Which of the following is/are true? ANS Tidal currents can be very strong, making diving difficult or even dangerous. 9. What is/are the primary cause(s) of permanent ocean currents? ANS The sun warming equatorial ocean water. Seismic activity deep under water. The earth's rotation. Both the first and third answers are correct