Which of the following statement is wrong?

The drier in an oil paint should not be more than

The compressive strength of perforated bricks should not be less than

The average out-turn of first class bricks in kiln burning is

The purpose of seasoning of timber is to

The colour of brick depends upon the amount of iron oxide present in the clay.

The natural drying of bricks is also called hack drying.

The commonly used extender in a paint is

The quarrying of stone by the method of wedging is successfully carried out in