Whitworth compressed steel is obtained when molten steel is subjected to a pressure of

Pick up the correct statement from the following:

Plastics are compounds of carbon with element

For one cubic metre of brick masonry, number of bricks required, is

Which one of the following polymers is obtained from condensation polymerization?

The size of mould for bricks, is generally kept

The portion of a brick cut to form angles other than right angles in plan, is known as

The most important constituent of varnish, is

The commonly used base for iron and steel work, is