The timber whose thickness is less than 5 cm and the width exceeds 12 cm, is called a

The compressive strength of perforated bricks should not be less than

The amount of gypsum, usually, added in the manufacture of cement is

The strength of cement concrete increases with

Which of the following statement is wrong?

The pigment in paints is mixed to give desired

Igeous rock has

The percentage of the slag component of Portland-slag cement varies from

The specific surface (in cm2/g) of a good Portland cement should not be less than