1. . The chemical formula of silica sand is
(A) SiO
(B) SiO2
(C) CaO
(D) CaCO3
2. . Silica sand contains silica percentage
(A) 10-30
(B) 8-10
(C) 80-90
(D) 40-60
3. . Molding sand contains clay
(A) 6-10
(B) 2-4
(C) 1-2
(D) 80-90
4. . Molding sand contains amount of water
(A) 6-10
(B) 2-4
(C) 5-8
(D) 80-90
5. . Molding sand contains special additives
(A) up to 2
(B) 6-10
(C) 1-2
(D) 80-90
6. . Materials added to the molding sand mixture to develop some special property in the sand
(A) Binder
(B) Moisture
(C) Additives
(D) Clay
7. . Most commonly used binder in molding sand is
(A) Cement
(B) Dextrin
(C) Bentonite
(D) Molasses
8. . The molding sand ingredient used to activate binder is
(A) Coal dust
(B) Clay
(C) Wood flour
(D) Water
9. . The main constituent of molding sand is
(A) Silica sand
(B) Clay
(C) Binder
(D) Moisture
10. . The most common form of SiO2 is
(A) Quartz
(B) MgO
(C) CaO
(D) Limestone