Instrument Flight Rules (IFR) Practice Exam 2025 – The All-in-One Guide to Master Your IFR Certification!

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What does a high relative humidity indicate during flight?

Increased chance of clear air turbulence.

Potential for low visibility due to fog or precipitation.

High relative humidity during flight indicates a significant amount of moisture in the air, which can lead to conditions that affect visibility. When air is saturated with water vapor, the likelihood of fog development increases, especially near the ground. This can severely impact visibility for pilots, creating challenges during takeoff, landing, and navigation. Additionally, high humidity can contribute to precipitation, further reducing visibility.

Understanding humidity's role is crucial for pilots as it informs them about possible weather conditions they may encounter, thereby allowing for better flight planning and safety measures. While other answers touch on different aspects related to flying, they do not directly address the primary effect of high humidity on visibility as comprehensively as the correct choice.

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Enhanced lift performance for the airplane.

Decreased sensitivity to pressure changes.

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