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Which of the following is an effective surface as per Indian standard?

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Which of the following is an effective surface as per Indian standard?

(a) A real surface is an effective surface

(b) It is the direction of predominant surface pattern

(c) Close representation of real surface

(d) Real surface which doesn’t represent instrumental means

The question was asked in a national level competition.

My question is based upon Terminology as per Indian Standards topic in chapter Measurement of Surface Finish of Engineering Metrology

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Correct answer is (c) Close representation of real surface

Explanation: A real surface is the surface which limiting the body and separating it from the surface of surrounding and effective surface is the close representation of real surface which is obtained by instrumental means.

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