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The rate of change of the viscosity with raise in temperature is measured by an arbitrary scale called as _________

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The rate of change of the viscosity with raise in temperature is measured by an arbitrary scale called as _________

(a) Arbitrary constant

(b) Viscosity constant

(c) Viscosity index

(d) Arbitrary index

The question was asked during an online exam.

This intriguing question comes from Viscosity and Viscosity Index in division Lubricants of Applied Chemistry

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Correct choice is (c) Viscosity index

Explanation: The rate of the change of the viscosity with raise in temperature is measured by an arbitrary scale called as viscosity index. The viscosity index is found by comparing the viscosity of the oil under the temperature of 1000F with two standard oils.

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