Which of the following metamorphic rocks has the most weather resisting characteristics?

Proper amount of entrained air in concrete results in<br> (i) Better workability<br> (ii) Better resistance …

Asbestos is

Plaster of Paris is obtained by calcining

Good quality sand is never obtained from

The vehicle used in case of enamel paints is usually

Turpentine oil is used in paints as

Manganese steels

Three basic raw materials which are needed in large quantities for production of steel are