Question 61:
Which process is often used to remove impurities from iron before it is turned into steel?
A) Quenching
B) Tempering
C) Refining
D) Sintering
Answer: C) Refining
Explanation: Refining processes are employed to remove impurities from molten iron, preparing it for conversion into steel.
Question 62:
What is “quenching” in metallurgy?
A) Heating metal to high temperatures
B) Cooling metal rapidly in water or oil
C) Adding alloys to metal
D) Mixing different metals
Answer: B) Cooling metal rapidly in water or oil
Explanation: Quenching is a heat treatment process where metal is cooled rapidly to harden it, often used in the treatment of steel.
Question 63:
Which of the following is a characteristic of stainless steel?
A) High ductility
B) Corrosion resistance
C) Low strength
D) High thermal conductivity
Answer: B) Corrosion resistance
Explanation: Stainless steel is known for its excellent corrosion resistance due to the presence of chromium, making it suitable for various applications.
Question 64:
What is the main raw material used in the production of copper?
A) Chalcopyrite
B) Hematite
C) Bauxite
D) Galena
Answer: A) Chalcopyrite
Explanation: Chalcopyrite (CuFeS2) is the primary ore for copper extraction, containing copper, iron, and sulfur.
Question 65:
What is the primary advantage of using an electric arc furnace?
A) Lower production costs
B) Ability to recycle scrap metal
C) Simplicity of operation
D) No emissions
Answer: B) Ability to recycle scrap metal
Explanation: Electric arc furnaces are particularly advantageous for recycling scrap metal and producing high-quality steel.
Question 66:
Which of the following is a method used to extract uranium from its ore?
A) Amalgamation
B) Leaching
C) Sintering
D) Flotation
Answer: B) Leaching
Explanation: Uranium is commonly extracted from its ore through leaching processes, where solvents dissolve uranium, allowing for its separation from other materials.
Question 67:
What is the main drawback of using mercury in amalgamation processes?
A) It is expensive
B) It is highly toxic
C) It is ineffective
D) It requires high temperatures
Answer: B) It is highly toxic
Explanation: Mercury is highly toxic, posing significant health and environmental risks during its use in amalgamation for gold extraction.
Question 68:
Which of the following metals has the highest melting point?
A) Iron
B) Titanium
C) Tungsten
D) Gold
Answer: C) Tungsten
Explanation: Tungsten has the highest melting point of all metals, making it suitable for high-temperature applications.
Question 69:
What is the primary use of molybdenum in metallurgy?
A) Alloying agent
B) Electrical contacts
C) Catalytic converters
D) All of the above
Answer: D) All of the above
Explanation: Molybdenum is used as an alloying agent, in electrical contacts, and in catalytic converters, showcasing its versatility in metallurgy.
Question 70:
Which metallurgical process involves the solidification of molten metal in a mold?
A) Casting
B) Sintering
C) Welding
D) Forging
Answer: A) Casting
Explanation: Casting is the process where molten metal is poured into a mold and allowed to solidify, creating a specific shape.
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