Question
Question: Excessive friction takes place, when the viscosity is...
Excessive friction takes place, when the viscosity is
A
Zero
B
Too low
C
Too high
D
Moderate
Answer
Too high
Explanation
Solution
Viscosity is a measure of a fluid's resistance to flow. This resistance arises from internal friction within the fluid. When a fluid has high viscosity, its internal layers experience significant resistance to relative motion, leading to high internal friction. Therefore, "excessive friction" in the context of fluids directly corresponds to "too high" viscosity.