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If the viscosity must not be ________ to a liquid oil film between two moving liquid.

(a) High

(b) Low

(c) Moderate

(d) Zero

This question was posed to me during a job interview.

Question is from Viscosity and Viscosity Index in division Lubricants of Applied Chemistry

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Best answer
The correct answer is (b) Low

For explanation: The viscosity the most important and the only property of the lubricating oils to determine the thickness and velocity of the liquid. If the viscosity of an oil is too low then it is impossible to maintain liquid oil film between two moving or sliding liquids.so, every liquid must have good viscosity value.

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