Question

In which type of test the capillary action principle is used?

(a) Probe test

(b) Bend liquid test

(c) Dye penetrant test

(d) Torsion test

The question was asked in an online interview.

This key question is from Testing topic in portion Concrete Mix Design of Concrete Technology

Answer 1

Correct choice is (c) Dye penetrant test

For explanation I would say: Dye penetrant test uses the capillary action principle to detect surface discontinuities. In this method liquid is applied on a metallic surface and it gets entered into cracks which are open.