Question 51:
What is the primary use of nickel in metallurgy?
A) Construction materials
B) Battery production
C) Coating and alloying
D) Electrical wiring
Answer: C) Coating and alloying
Explanation: Nickel is widely used for coating (to prevent corrosion) and as an alloying element in stainless steel and other alloys to enhance strength and corrosion resistance.
Question 52:
Which gas is often used in the reduction of iron ore in a blast furnace?
A) Nitrogen
B) Carbon monoxide
C) Helium
D) Hydrogen
Answer: B) Carbon monoxide
Explanation: Carbon monoxide is generated from the combustion of coke and is a key reducing agent in the blast furnace, reducing iron ore to iron.
Question 53:
What type of mining involves extracting metals from the earth’s surface using open pits?
A) Underground mining
B) Alluvial mining
C) Surface mining
D) In-situ mining
Answer: C) Surface mining
Explanation: Surface mining involves extracting minerals from the earth’s surface using open pits, which is common for certain metal ores.
Question 54:
Which of the following is a common method for producing ferrous alloys?
A) Powder metallurgy
B) Electric arc furnace
C) Sintering
D) All of the above
Answer: D) All of the above
Explanation: Ferrous alloys can be produced through various methods, including powder metallurgy, electric arc furnaces, and sintering.
Question 55:
What is the main component of the ore sphalerite?
A) Iron
B) Zinc
C) Copper
D) Lead
Answer: B) Zinc
Explanation: Sphalerite is primarily composed of zinc sulfide (ZnS) and is the main ore for extracting zinc.
Question 56:
Which metallurgical process is used to recover metals from their ores using microorganisms?
A) Bioleaching
B) Hydrometallurgy
C) Electrolysis
D) Pyrometallurgy
Answer: A) Bioleaching
Explanation: Bioleaching is the use of microorganisms to extract metals from ores, often applied in the recovery of copper and gold.
Question 57:
What is the primary metal obtained from the ore galena?
A) Silver
B) Zinc
C) Lead
D) Copper
Answer: C) Lead
Explanation: Galena is a lead sulfide mineral (PbS) and is the primary ore from which lead is extracted.
Question 58:
Which of the following is a common use of tungsten?
A) Electrical contacts
B) Structural beams
C) Jewelry
D) Food packaging
Answer: A) Electrical contacts
Explanation: Tungsten is known for its high melting point and conductivity, making it ideal for use in electrical contacts and filaments.
Question 59:
What is the purpose of using a ladle in metallurgy?
A) To smelt ores
B) To transport and pour molten metal
C) To cool down metals
D) To mix alloys
Answer: B) To transport and pour molten metal
Explanation: A ladle is used in metallurgy to safely transport molten metal from the furnace to the casting area and pour it into molds.
Question 60:
Which type of alloy is steel?
A) Ferrous alloy
B) Non-ferrous alloy
C) Composite alloy
D) Superalloy
Answer: A) Ferrous alloy
Explanation: Steel is classified as a ferrous alloy because it is primarily composed of iron, with carbon and other elements added to enhance its properties.
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