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The viscosity index can be improved by adding ___________

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The viscosity index can be improved by adding ___________

(a) Linear polymers

(b) Branched polymers

(c) Cyclic polymers

(d) Inorganic materials

The question was posed to me in an internship interview.

This is a very interesting question from Types of Additives topic in section Lubricants of Applied Chemistry

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The correct option is (a) Linear polymers

Explanation: The viscosity index can be improved by adding linear polymers like poly isobutyls and poly methacrylates and poly alkyl styrene. They range from 10000 to 100000 molecular weight. They increase the viscosity and retains the original viscosity coefficient.

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