For a stone to be used in road work, coefficient of hardness should be greater than _______

Reflective sheet materials used as thermal insulating material have _______ reflectivity and ______ emissivity.

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

Aston’s process is used to manufacture _____

Which tool is used to make blast holes in the process of blasting?

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

Augite forms crystals of ____ shape.

For a good stone, the percentage absorption by weight after a day in the water absorption test should not exceed _______…