Q.

Which of the following is not used as a lubricant?

A. lubricating oil
B. grease
C. asphalt
D. petroleum jelly
Answer» C. asphalt
Explanation: lubricating oils and grease are primarily used as lubricating agents, while petroleum jelly is used for lubrication as well as in cosmetics and medicines. asphalt is a residue type product used for waterproofing of roofs and to make roads.
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