is due to presence of irregularities on a surface.

Softness

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Hardness

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Roughness

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Smoothness

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Solution

The correct option is C Roughness
Surface roughness is due to irregularities present on a surface. When two rough surfaces are in contact, these irregularities interlock and resist slipping between the surfaces.

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If friction is caused due to interlocking of surface irregularities then why does a fan stop when switched off?

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