Question

According to Newton’s law of viscosity, the maximum velocity of flow is at __________

(a) Top of the tube

(b) Bottom of the tube

(c) Middle of the tube

(d) It is same at all the places

The question was posed to me by my school teacher while I was bunking the class.

Origin of the question is Viscosity in division Criteria of Purity and Characterisation of Materials of Engineering Chemistry I

Answer 1

The correct answer is (c) Middle of the tube

Easiest explanation: According to Newton’s law of viscosity, the maximum velocity of flow is at the middle of the tube. It states that for given shear stress acting on a fluid element, the rate at which the fluid deforms is inversely proportional to the viscosity.