FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

The internal resistance of a fluid which tends to prevent it from flowing is called?

Density

Viscosity

Viscosity is the correct answer because it refers to the internal resistance of a fluid to flow. This property is due to the fluid's cohesive forces between its molecules.

Density (Option A) is incorrect because it relates to the mass per unit volume of a substance rather than its resistance to flow.

Acidity (Option C) is incorrect as it refers to the measure of the concentration of hydrogen ions in a solution, not the resistance of a fluid to flow.

Surface tension (Option D) is incorrect because it is the property of the surface of a liquid that allows it to resist an external force due to the cohesive nature of its molecules, as opposed to internal resistance to flow.

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Acidity

Surface tension

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