Question

The viscosity of the oil changes rapidly with the change in temperature has _______

(a) High V.I

(b) Low V.I

(c) Moderate V.I

(d) Zero V.I

The question was posed to me in an international level competition.

This interesting question is from Viscosity and Viscosity Index in section Lubricants of Applied Chemistry

Answer 1

The correct choice is (d) Zero V.I

Explanation: The viscosity of some lubricating oils changes by the change in the temperature very rapidly. For such oils the V.I will be zero and for the viscosity of the oils which changes slightly with the change in temperature will have V.I high.