which is not used as lubricant... a. Grease b. Graphite c. soab solutiond. smooth surface
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Answer: d
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Grease oil is used as lubricant on wheels of the machines for its proper functionality and reduces friction between the parts of machines. ... Paper is not a lubricant as it is itself a rough surface, and cannot be used as a lubricant. So, the correct answer is “Option D”.
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