Which is true regarding the presence of alcohol within the human body?

Why: This is a published FAA UAG sample knowledge-test question. Its correct answer is that judgment and decision-making can be adversely affected by even small amounts of alcohol — the remote pilot study guide confirms that as little as one ounce of alcohol can impair judgment, decrease sense of responsibility, affect coordination, and impair vision and hearing.

• Alcohol impairs, not improves, vision acuity — the study guide states impairments in vision and hearing can occur from consuming as little as one drink.
• No amount of water accelerates the body's metabolism of alcohol; a pilot with a hangover is still under the influence even while feeling normal, since alcohol can remain in the body for over 16 hours.