Siliceous rocks have alumina or clay as their major constituent.

Igeous rock has

The standard size of a masonry brick is 20 cm x 10 cm x 10 cm

The strength of cement concrete is directly proportional to cement-water ratio.

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

Excess of silica in the clay

The principal constituent of every kind of brick earth is alumina.

The defect caused due to over-maturity and unventilated storage of the wood during its transit, is called

The silica in Portland cement should be