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Question

Which of the following materials increases friction?

A
Powder
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B
Rubber
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C
Machine oil
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D
Grease
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Solution

The correct option is B Rubber
Materials which are used to reduce friction between two surfaces are called lubricants. Out of the given options, powder, machine oil and grease are examples of lubricants.

Rubber is not a lubricant as it is used to increase friction.

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