Question

Mohr envelope can be considered to be straight if the angle of internal friction φ is assumed to be __________

(a) 90°

(b) >90°

(c) <90°

(d) None of the mentioned

This question was addressed to me in an online interview.

Question is taken from Mohr in section Shear Strength of Geotechnical Engineering I

Answer 1

The correct choice is (d) None of the mentioned

The explanation: Mohr envelope can be considered straight if the angle of internal friction φ is assumed to be a constant.