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Question

Which of the following statements about a lubricant is correct?


A

A lubricant is used to increase friction.

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B

A lubricant is used to reduce friction.

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C

A lubricant is used to increase the heat between two surfaces.

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D

A lubricant is used to reduce the heat between two surfaces.

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Solution

The correct options are
B

A lubricant is used to reduce friction.


D

A lubricant is used to reduce the heat between two surfaces.


Friction causes wear and tear of the moving parts of a machine. In order to prevent or reduce friction, we use lubricants like oil, grease etc. A lubricant reduces friction between the surfaces, and hence, reduces the heat between two surfaces.


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