The crude impure iron extracted from the ores of iron is called as ______

Commonly used fluxing material used in the process of smelting is _______

Smelting is carried out in a _______

Which of the following is not a classification of rocks from which building stones are obtained?

Basalt is an example of _____ rock.

Which of the following is not a method of quarrying?

The process of converting pig iron into wrought iron by stirring in the molten state is called as _____

Which of the following qualities is not possessed by the filters in the air conditioning system?