The document contains a 50 question multiple choice quiz on principles of metallurgy. The questions cover topics like common metal ores and their chemical formulas, processes involved in extracting metals from ores like smelting, roasting and calcination, and important terms used in metallurgy like gangue, flux and slag. The correct answers to each multiple choice question are also provided.

1. Tenth Class Bit Bank Physical Science
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam. 9440234404 39
13. Principles of Metallurgy
Multiple Choice Questions
1. The impurity present in the ore is called as _________ [ A ]
A) Gangue B) flux C) Slag D) Mineral
2. Which of the following is a carbonate ore? [ A ]
A) Magnesite B) Bauxite C) Gypsum D) Galena
3. Which of the following is the correct formula of Gypsum [ D ]
A) CuSO4. 2H2O B) CaSO4.½ H2O C) CuSO4.5H2O D) CaSO4. 2H2O
4. The oil used in the froth floatation process is __________ [ B ]
A) kerosene oil B) pine oil C) coconut oil D) olive oil.
5. Froth floatation is method used for the purification of ______ore. [ A ]
A) sulphide B) oxide C) carbonate D) nitrate
6. Galena is an ore of ———————— [ B ]
A) Zn B) Pb C) Hg D) Al
7. The metal that occurs in the native form is __________ [ B ]
A) Pb B) Au C) Fe D) Hg
8. The most abundant metal in the earth’s crust is —————— [ B ]
A) Silver B) Aluminium C) zinc D) iron
9. The reducing agent in thermite process is ___________ [ A ]
A) Al B) Mg C) Fe D) Si
10. The purpose of smelting an ore is to __________ it. [ B ]
A) Oxidise B) Reduce C) Neutralise D) none of these
11. The reducing agent used in thermite process is____________ [ A ]
A) Al B) Mg C) Fe D) Si
12. The purpose of smetting an ore is to ____________ it [ D ]
A) 4Oxidse B) Reduce C) Neutralise D) None
13. The dprocess used to convent sulphise ore into oxide ore is____________ [ D ]
A) Roasting B) Calcination C) Smetting D) None
14. The substance added to remove the impurity is____________ [ A ]
A) Gangue B) Flux C) Fuel D) None
15. The most abundent metal in he earth's crust is ____________ [ C ]
A) Silver B) Zinc C) Aluninium D) Iron
16. ____________group elements are called chalcogens. [ A ]
A) 16th B) 15th C) 14th D) 13th
17. Low boiling metals are purified by ____________ method. [ B ]
A) Poling B) Distillation C) Liquation D) Electro refining
18. The part of Furnace where we keep Fuel for burning is_____________ [ A ]
A) Hearth B) Fire box C) Chimney D) None
19. During corrosion ____________ process takes place. [ C ]
A) Oxidation B) Reduction C) Both D) None
20. ____________ is the place inside the furnace where the ore is kept for heating purpose. [ A ]
A) Fire box B) Hearth C) Chimney D) None

2. Tenth Class Bit Bank Physical Science
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam. 9440234404 40
21. _____________is an alloy of copper and tin. [ A ]
A) Bronze B) Steel C) Brass D) Nickel
22. The impurities like clay in a ore is called______________ [ B ]
A) Slag B) Gangue. C) Ore D) Flux
23. _______________ process involves the reaction of metal oxides with aluminium. [ C ]
A) Roasting B) Calcination C) Thermite D) Smelting
24. The chemical formula of cinnabar is____________ [ A ]
A) HgS. B) Pbo C) Fe2O3 D) Pb(NO3)2
25. The substance added to the ore to remove gangue from it is called ______________ [ D ]
A) Slag B) Gangue C) Ore D) Flux
26.____________are a process of heating the ore strongly in the absence of air or oxygen. [ B ]
A) Roasting B) Calcination C) Thermite D) Smelting
27. ___________ is a process of heating the ore strongly in a free supply of air or oxygen. [ A ]
A) Roasting B) Calcination C) Thermite D) Smelting
28. A metallic compound occurring in the earth crust along with impurities is called ______[ D ]
A) Gangue B) Flux C) Fuel D) Mineral
29. A mineral from which a metal can be extracted economically and conveniently is called [ C ]
A) Gangue B) Flux C) Ore D) Mineral
30. Blister copper is purified by ______________ [ A ]
A) Poling method. B) Calcination C) Thermite D) Smelting
31. The substance added to the ore to remove gangue from it is called______________ [ A ]
A) Flux B) Gangue C) Ore D) Slag
32. Bronze is an alloy of _______________ [ D ]
A) copper and lead B) copper and Silver C) copper and gold D) copper and tin
33. The most abundant metal in earth crust is____________ [ B ]
A) Oxygen B) Aluminium C) Zinc D) Iron
34. The chemical process in which one is heated in the absence of air is called__________ [ C ]
A) Roasting B) Smelting C) Calcination D) Distillation
35. Smelting is carried out in ____________ Furnace. [ B ]
A) Reverberatory B) Blast C) Retort D) Clay
36. The impurities present in the ore is called______________ [ D ]
A) Slag B) Forth C) Flux D) Gangue
37. ____________ is a process of heating the ore strongly in the presence of oxygen. [ B ]
A) Smelting B) Roasting C) Calcination D) Distillation
38. The method suitable for purification of low boiling metals is___________________ [ B ]
A) Poling B) Distillation C) Liquation D) Electrolytic Refining
39. The oil used in the froth floatation process is__________________ [ B ]
A) Kerosene B) Pine Oil C) Coconut Oil D) Olive Oil
40. Which of the following element occurs in free state? [ D ]
A) Phosphorus B) Sulphur C) Silicon D) Gold

3. Tenth Class Bit Bank Physical Science
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam. 9440234404 41
41. Galena is an ore of________________ [ B ]
A) Zn B) Pb C) Fe D) Al
42. The purpose of smelting an ore is to _________________ [ A ]
A) Oxidize B) Reduce C) Neutralize D) None of these
43. Forth floating is a method for the purification of _____________ ore. [ A ]
A) Sulphide B) Oxide C) Carbonate D) Nitrate
44. Roasting is carried out in ______________ Furnace. [ A ]
A) Reverberatory B) Blast C) Retort D) Clay
45. During calcinations, carbonate is converted to its ______________ [ A ]
A) Oxide B) Sulphite C) A and B D) None of these
46. Chemical formula of a Cinnabar is _____________ [ C ]
A) HgS B) AgCl C) PbS D) NaCl
47. Chemical formula of a Horn silver is _____________ [ B ]
A) HgS B) AgCl C) PbS D) NaCl
48. Chemical formula of a Gelena is _____________ [ C ]
A) HgS B) AgCl C) PbS D) NaCl
49. Chemical formula of a Rocksalt is _____________ [ D ]
A) HgS B) AgCl C) PbS D) NaCl
50. How many water molecules are present in Epsom salt? [ D ]
A) 4 B) 5 C) 6 D)7