The central part of a tree is called

Distemper is used on

The quarrying of stone by the method of wedging is successfully carried out in

Vicat's apparatus is used to determine the

Efflorescence is caused if

The lime mortar is made from

A good building stone is one which does not absorb more than

The size of mould for bricks should be

The timber whose thickness is less than 5 cm and the width exceeds 12 cm, is called a