Inner part of a timber log surrounding the pith, is called

The commonly used raw material in the manufacture of cement, is

Pegmatite is a/an

Pick up the correct statement from the following:

Which one of the following is acid resistant asbestos:

Pick up the correct statement regarding low heat cement from the following:

The low voltage porcelain is mainly used for

Pick up the correct statement from the following:

Stones used for rubble masonry must be