Minimum of 40% of iron, is available in

Asbestos

Dorry's testing machine is used for

Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:

Plywood is obtained by gluing wooden sheets at

During pudding

The presence of sand in brick earth prevents:

Refractory bricks are used for

The wedging is adopted for quarrying costly stratified rock such as