Firebrick is referred to as "common brick" because it is the most commonly used

type of brick.

Answer: Firebrick is referred to as "common brick" because it is the most commonly used type of brick - - - False

Explanation:

Firebrick is not the most commonly used, it is a refractory ceramic brick used in lining of furnaces and kilns, which is built basically to withstand or resist high temperature. The most commonly used type of brick, is the Building Brick called "common brick" because it is versatile and used for applications where appearance is not an important factor.