Is it true that smooth material lacks bumps or ridges on its surface?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
Yes, a smooth material lacks bumps or ridges on its surface. Its surface is flat with no irregularities or roughness. Smooth materials lack friction. For example, glass and mirror. Rough materials are those which have irregularities with bumps and ridges. For example, sandpaper and rock.

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