Proper amount of entrained air in concrete results in
(i) Better workability
(ii) Better resistance to freezing and thawing
(iii) Lesser workability
(iv) Less resistance to freezing and thawing

The specific gravity of marble, is

Pig iron is manufactured from the ores by

For obtaining vinyl chloride acetate, the method used, is

The frog of the brick in a brick masonry is generally kept on

Pick up the correct statement from the following:

Asphalt is obtained from

A mortar joint in masonry which is normal to the face of wall is known as

Plaster of Paris is obtained by calcining