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Question


Which of the following is a lubricant?


Options:
A .   Rubber
B .   Sand
C .   Salt
D .   Grease
Answer: Option D
:
D

The substances which when applied between two surfaces reduce friction between them are known as lubricants. They help in reducing heat generation, and wear and tear in machines. Grease is a commonly used lubricant which is used in machines to reduce friction.



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