The compound of Portland cement which reacts immediately with water and also sets first is

In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as

Which of the following gradients exerts maximum influence on properties of steel?

Plastic . . . . . . . .

Shingle is

Refractory bricks resist

The type of steel used for precision levelling staff, is

The rock generally used for roofing, is

Turpentine oil is used in paints as