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Question

A good lubricant must have:

A
high viscosity
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B
low viscosity
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C
high density
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D
low surface tension
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Solution

The correct option is B high viscosity
Good lubricant must have high viscosity. So, that machine parts can do work better. Higher the viscosity of the lubricants the greater is its ability to provide boundary lubrication, which means a boundary between moving parts.

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