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

A badly mixed cement concrete results in

Blister steel

A volatile substance added to a paint to make its application easy and smooth, is known as

Pick up the correct statement from the following:

The size of mould for bricks, is generally kept

In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is

The initial setting time for ordinary Portland cement as per IS specifications should not be less than

Age of a tree may be ascertained by