For sanitary pipes and chemical stonewares,

Duco paints are

Which of the following is a rock?

Softer variety of steel may be obtained by

Blister steel

Early attainment of strength in rapid hardening cement is mainly due to

The most fire resistant paints are:

The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

Pick up the correct statement from the following: