PADI Divemaster Certification Practice Exam

How can divers recognize a current?

1. By the clarity of water

2. By changes in water temperature

3. By discoloration and disruption in waves

4. By observing fish behavior

The correct answer is: By discoloration and disruption in waves

Divers can recognize a current primarily by observing discoloration and disruption in the waves on the surface of the water. When a current is present, it can stir up sediments or debris, which alters the coloration of the water. These visual cues are key indicators that signal the presence of a current below the surface. Additionally, ripples or other disturbances on the water's surface due to a current can further demonstrate how the water movement is impacting the overall environment. While clarity of water, changes in temperature, and fish behavior can sometimes provide hints about water conditions, they are less direct indicators of current. Water clarity can be influenced by several factors beyond current, such as recent weather events or algae blooms. Temperature changes may occur due to thermoclines or underwater springs, which do not necessarily correlate with current. Fish behavior is influenced by a variety of factors, and while some species might react to currents, not all fish will show a noticeable response. Thus, visual disruption in the surface waves directly reflects the presence and strength of a current, making it the most reliable method for divers to recognize water movement.