As the temperature rises, the viscosity of a liquid
Correct answer: B. decreases
- A. increases
- B. decreases
- C. stays the same
- D. becomes zero
Explanation
Heating gives the molecules enough energy to slip past one another more easily, weakening the intermolecular attractions that resist flow, which is why warm honey pours readily. Gases behave in the opposite way: their viscosity rises with temperature because it comes from molecular collisions rather than cohesion. Confusing the two cases is the usual mistake.
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About Fluid Drag
Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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