Question

If there is no friction between the slab and the sub-grade, then there are ______ in slab.

(a) no stresses

(b) small number of stresses

(c) large number of stresses

(d) temperature gradients

I got this question by my school teacher while I was bunking the class.

This intriguing question originated from Design of Rigid Pavements topic in division Design of Flexible & Rigid Pavement of Geotechnical Engineering II

Answer 1

Correct option is (a) no stresses

Easiest explanation: The stresses are set up in the slab due to uniform temperature changes. If this is absent and the slab is free to move without resistance, then there is no friction between the slab and sub-grade. Thus, if there is no friction between the slab and the sub-grade, then there are no stresses in slab.