Bituminous fells are used for

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

In order of increasing percentage of silica, the correct sequence is

The stones obtained by blasting are used as

Advantage of a clamp compared to a kiln for burning bricks is that

A badly mixed cement concrete results in

Initial setting of cement is caused due to

Pick up the polymineralic rock from the following:

Which of the following bricks are used for lining of furnaces?