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The more friction of the greases is due to their high __________

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The more friction of the greases is due to their high __________

(a) velocity

(b) viscosity

(c) temperature coefficient

(d) buoyancy

The question was asked in an online quiz.

My question is from Classification of Lubricants in section Lubricants of Applied Chemistry

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The correct answer is (b) viscosity

To elaborate: The more friction of the greases is due to their viscosity. They are very thick semi solid lubricants. If the speed in high then friction is also high and then the heat produced will be more. As, the greases are very poor coolants they will be overheated.

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