Q.

Which of the following material is not used for rubbing on the surface to be inspected in scratch inspection?

A. softer material
B. hard material
C. plastic
D. lead babbitt
Answer» B. hard material
Explanation: in scratch inspection method, a softer material like plastic or lead babbitt is rubbed over the surface to be inspected. it carries the impression of the scratches on it which can be easily visualised.
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