Metals MCQs | Metallurgy

By: Prof. Dr. Fazal Rehman | Last updated: May 21, 2025

1. : Which is/are physical methods for ore concentration?
(A) Gravity separation
(B) Magnetic separation
(C) Froth floatation method
(D) All of these

2. : Which of the following ores is/are separated by froth floatation method?
(A) Galena (PbS)
(B) Copper pyrite (CuFeS₂)
(C) Zinc blende (ZnS)
(D) All of these

3. : Which ore is/are used for Pb extraction?
(A) Galena
(B) Zinc blende
(C) Cinnabar
(D) Calamine

4. : Which of the following is the process of removing matrix/gangue by fusing with flux?
(A) Roasting
(B) Sintering
(C) Calcination
(D) Smelting

5. : Which of the following metal is obtained by carbon reduction process?
(A) Al
(B) Cu
(C) Zn
(D) Mg

6. : Which of the following oil is/are used in froth floatation method?
(A) Canola oil
(B) Pine oil
(C) Coconut oil
(D) Brassica oil

7. : Which of the following is/are chemical methods for ore concentration?
(A) Calcination
(B) Smelting & leaching
(C) Roasting
(D) All of these

8. : Which ore is/are used for Zn extraction?
(A) Zincite
(B) Zinc blende
(C) Calamine
(D) All of these

9. : Which ore is/are used for Hg extraction?
(A) Cinnabar
(B) Zinc blende
(C) Calamine
(D) All of these

10. : Which is the second anciently known metal?
(A) Copper
(B) Nickel
(C) Silver
(D) Gold

11. : Gun metal alloy consists of copper and ___.
(A) Zn
(B) Al
(C) Sn
(D) Ni

12. : Which is the third most abundant element in the nature?
(A) Oxygen
(B) Aluminum
(C) Sulphur
(D) Hydrogen

13. : Aluminum occurs in nature as which of the following?
(A) Native
(B) Free
(C) Both native & combined
(D) Combined

14. : Which of the following is not an ore of aluminium?
(A) Bauxite
(B) Cryolite
(C) Monazite
(D) Mica

15. : Aluminium is typically extracted from which of the following?
(A) Feldspar
(B) Alumite
(C) Bauxite
(D) Cryolite

16. : Which impurities are present with the bauxite?
(A) Silica
(B) Alumina
(C) Both silica and ferric oxide
(D) Ferric oxide

17. : Which steps is/are involved in the metallurgy of aluminium?
(A) Electrolytic reduction of alumina
(B) Refining of aluminum
(C) Purification of bauxite
(D) All of these

18. : Which of the following process is not involved in the purification of bauxite?
(A) Bayer’s process
(B) Goldsmith’s process
(C) Serpek’s process
(D) Hall’s process

19. : In Serpek’s process the ore is treated with ________.
(A) Coke
(B) Nitrogen gas
(C) None of these
(D) Both A & B

20. : What is the formula of Cryolite?
(A) NaзAIF₄
(B) Na₃AIF₆
(C) Na₃AIF₃
(D) Na₃AIF₅

21. : Which property is not correlated to aluminum?
(A) It is a silvery white metal with brilliant lustre
(B) It is malleable and ductile
(C) It is the least reactive element of III group
(D) It is a very light metal with specific gravity as 2.7

22. : Which is not alloy of aluminium?
(A) Stellite
(B) Magnelium
(C) Aluminium bronze
(D) Duralumin

23. : Which element is a refractory substance?
(A) Cr
(B) Fe
(C) Al
(D) Ni

24. : Which of the following process is used to get pure Al (99.99%)?
(A) Hall’s process
(B) Serpek’s process
(C) Hopp’s process
(D) Bayer’s process

25. : Which of the following is the second most abundant element occurring in the earth crust?
(A) Ni
(B) Iron
(C) Cr
(D) Cu

26. : Which is not an ore of iron?
(A) Magnetite
(B) Monazite
(C) Haematite
(D) Siderite

27. : What is the total number of varieties of commercial iron that are still known?
(A) 4
(B) 2
(C) 1
(D) 3

28. : Which of the following is the purest form of iron?
(A) Steel
(B) Wrought iron
(C) Pig iron
(D) Cast iron

29. : ________ is the Iron having up to 1% carbon.
(A) Pig iron
(B) Cast iron
(C) Steel
(D) Wrought iron

30. : Which statement is not correct regarding Open Hearth process?
(A) Steel obtained is of high quality
(B) The process is economical and simple
(C) Scrap iron cannot be used in this process
(D) No iron is lost

31. : Which steel is hard and corrosion resistant?
(A) Stainless steel (Cr-steel)
(B) Mn-steel
(C) Si-steel
(D) Ni-steel

32. : Stainless steel consists of elements like ________.
(A) Fe & Ni
(B) Cr only
(C) Fe, Ni & Cr
(D) Fe only

33. : Which of the following is the process in which iron changes over to a compound in environment?
(A) Corrosion
(B) Rusting
(C) Galvanization
(D) Annealing

34. : Which factors speed up rusting process?
(A) Presence of rust
(B) Contact with less active metal
(C) Presence of acidic environment
(D) All of these

35. : Which step prevent rusting process?
(A) Painting
(B) Coating of Fe₃O₄ over iron surface
(C) Electroplating of iron with Cr/Ni
(D) All of these

36. : Which of the following are the solid compounds of metals which are found in nature?
(A) Minerals
(B) Ores
(C) Slag
(D) Gangue

37. : Which is the mineral from which a metal is extracted?
(A) Slag
(B) Gangue
(C) Minerals
(D) Ores

38. : Which is/are the impurities which are present in ores?
(A) Gangue
(B) Slag
(C) Minerals
(D) Flux

39. : Which of the following is a chemical substance which is used to remove gangue from ore?
(A) Slag
(B) Matrix
(C) Flux
(D) Gangue

40. : Which is/are the ores of Mg?
(A) Karnalite
(B) Magnesite
(C) Dolomite
(D) All of these

41. : Which of the following is the compound formed by combination of impurities in the ores and foreign substance added?
(A) Gangue
(B) Slag
(C) Matrix
(D) Flux

42. : Which material is a slag?
(A) BaO
(B) CaO
(C) SiO₂
(D) CaSiO₃

43. : Chromium is found in nature in the form of
(A) Sulphides
(B) Silicates
(C) Oxides
(D) Borates

44. : Ferrochrome contains Cr up to
(A) 80-90%
(B) 70-80%
(C) 40-50%
(D) 60-70%

45. : Which of the following is not a property of Cr?
(A) Its surface is tarnished easily
(B) It can take very high polish
(C) It is a brilliant silvery metal
(D) It is malleable

46. : When red hot steel is rapidly cooled in water, then the process is known as _____.
(A) Tampering
(B) Roasting
(C) Annealing
(D) Quenching

47. : In nature nickel is found in which form?
(A) Arsenides
(B) Sulphides
(C) Silicates
(D) All

48. : Which is not an ore of nickel?
(A) Nicollite
(B) Siderite
(C) Pentlandite
(D) Garnierite

49. : _________ % of nickel is existing in the major ore Pentlandite?
(A) 10%
(B) 22%
(C) 14%
(D) 18%

50. : In smelting process the ore is mixed with which one?
(A) Silica
(B) Limestone
(C) Coke
(D) All

51. Q51: Monel metal is an alloy of Ni which contains Ni up to
(A) 80%
(B) 50%
(C) 70%
(D) 60%

52. Q52: Which of the following process is used for the conversion of matte into nickel?
(A) Electrolytic process
(B) Monds process
(C) Orford process
(D) All

53. Q53: Which of the following metals form volatile carbonyl with CO below 80°C?
(A) Ni
(B) Co
(C) Fe
(D) Cu

54. Q54: Which is not a property of Ni?
(A) It is malleable and ductile
(B) It is highly magnetic
(C) It has high electrical and thermal conductivities
(D) It is a soft silvery white metal

55. Q55: Which of the following is the process in which ore is heated, generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points?
(A) Bessemerization
(B) Roasting
(C) Calcination
(D) Froth-floatation

56. Q56: Which of the following is the process in which ore is heated generally in the presence of air, at temperature below their melting points?
(A) Calcination
(B) Froth-floatation
(C) Roasting
(D) Bessemerization

57. Q57: Which is not an appropriate and proper use of Ni?
(A) It is used as catalyst
(B) It is attacked by alkalis
(C) It is used in alloy formation
(D) It is used in the preparation of Monel metal

58. Q58: Which of the following is the process of heating to redness and then slow cooling?
(A) Hardening
(B) Annealing
(C) Tempering
(D) Quenching

59. Q59: Which of the following is the process of extracting a metal in pure form from its ores?
(A) Crushing
(B) Grinding
(C) Dressing
(D) Metallurgy

60. Q60: The matrix is usually in the form of _____
(A) Sand
(B) Rocks
(C) Limestone
(D) All of these