A first class brick when immersed in cold water for 24 hours should not absorb water more than

The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called

Wrought iron contains carbon upto

Steel contains carbon approximately

Bitumen completely dissolves in

Stucco paints are suitable for

The stones obtained by blasting are used as

The commonly used color pigment in paints, is

The trunk of tree left after cutting all the branches is known as