Asbestos

The steel which contains fissures and cavities, is manufactured by

Pick up the correct statement from the following:

A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called

Pick up the correct statement from the following:

Calcination of iron ores is done

The most valuable timber may be obtained from

The minimum compressive strength of 1st class bricks should be

The kiln which may work throughout the year, is