Question 45General Subjects - QMED

The correct answer is D: As the temperature of a lubricating oil increases, the viscosity of the lubricating oil decreases. This relationship is based on the fundamental behavior of lubricating oils. As the temperature of a lubricating oil increases, the intermolecular forces between the oil molecules weaken, allowing them to move more freely and reducing the oil's resistance to flow, or viscosity. Conversely, as the temperature decreases, the viscosity of the lubricating oil increases due to the stronger intermolecular forces. The other options are incorrect because: A) While the relationship between viscosity and temperature can vary depending on the specific lubricant, the general trend is that as temperature increases, viscosity decreases. B) Viscosity is not constant and does change with temperature. C) Viscosity decreases as temperature increases, not increases.