Question

In brick jack arch flooring, joists are encased in ___________ mortar, for preventing their rusting from _________ mortar.

(a) Lime, cement

(b) Cement, lime

(c) Mud, cement

(d) Mud, lime

Answer 1

Right answer is (b) Cement, lime

For explanation I would say: In brick jack arch flooring, joists are encased in cement mortar, for preventing their rusting from the lime mortar. In this type of flooring, only well-burnt bricks should be used for construction and they are saturated with water before using them.