Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as

The moisture content in a well seasoned timber is

Pick up the correct statement from the following:

Early attainment of strength in rapid hardening cement is mainly due to

Putty is

Age of a tree may be ascertained by

Softer variety of steel may be obtained by

Crushing strength of a first class brick should not be less than

A heavy stone is suitable for