Question

____________ is fine pulverized material used as a binder.

(a) Water

(b) Sodium Silicate

(c) Iron Oxide

(d) Silica Flour

This question was addressed to me in an interview for internship.

The origin of the question is Binders and its Applications in chapter Casting Processes of Foundry and Forging

Answer 1

Correct choice is (d) Silica Flour

For explanation: The Silica Flour is fine pulverized materials that are used greatly to increase the amount of oil necessary in oil sand mixtures. This binder is used only when the sand properties are fixed and it need not vary.