1. . Materials added to the molding and sand mixture to develop some special property
(A) Additives
(B) Binder
(C) Parting powders
(D) Clay
2. . Coal dust is used in facing sand from
(A) 5-8%
(B) 5-10%
(C) 3-8%
(D) 1-5%
3. . It is used up to 35 % for the purpose of increasing hot strength
(A) Silica flour
(B) Coal dust
(C) Wood flour
(D) Pitch
4. . Dextrin is used in core sand up to ---- % for increasing collapsibility
(A) 10
(B) 10
(C) 7
(D) 3-8
5. . The additive used for increasing surface finishing of casting is
(A) Coal dust
(B) Silica flour
(C) Wood flour
(D) Pitch