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Question

Which of the following is not a lubricant?


A

Oil

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B

Grease

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C

Graphite

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D

Sand

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Solution

The correct option is D

Sand


The function of a lubricant is to decrease friction between two surfaces. Oil, grease, and graphite, when applied between two surfaces in contact, reduce friction between them. On the other hand, adding sand would increase friction.


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