Durability of building stone is affected by its

Pozzolana (or surkhi) is used in lime

Pick up the correct statement from the following:

The melting point of silica is :

Wrought iron is manufactured from pig iron by

The minimum compressive strength of 1st class bricks should be

Pick up the correct statement from the following:

The kiln which may work throughout the year, is

The material generally not used as extender in paints, is