Question 41:
Which process is commonly used to extract lead from its ore?
A) Roasting
B) Amalgamation
C) Hydrometallurgy
D) Smelting
Answer: D) Smelting
Explanation: Lead is primarily extracted from its ore through smelting, where lead sulfide is converted into lead metal.
Question 42:
What is “thermal treatment” in metallurgy?
A) Heating materials to high temperatures for processing
B) Cooling materials to room temperature
C) Melting metals using an electric arc
D) Electrolyzing molten metals
Answer: A) Heating materials to high temperatures for processing
Explanation: Thermal treatment refers to processes involving heating materials to alter their physical and sometimes chemical properties, often used in metalworking.
Question 43:
Which of the following metals is obtained from the ore bauxite?
A) Zinc
B) Iron
C) Aluminum
D) Nickel
Answer: C) Aluminum
Explanation: Bauxite is the primary ore for aluminum extraction through the Bayer process.
Question 44:
What is the main advantage of using the hydrometallurgical process?
A) Requires high temperatures
B) Less energy-intensive
C) More efficient than pyrometallurgy
D) Produces fewer emissions
Answer: B) Less energy-intensive
Explanation: Hydrometallurgical processes typically operate at lower temperatures than pyrometallurgical processes, making them less energy-intensive.
Question 45:
Which element is commonly used as an alloying element to improve the strength of steel?
A) Lead
B) Manganese
C) Tin
D) Mercury
Answer: B) Manganese
Explanation: Manganese is commonly added to steel to improve its strength and hardness while also aiding in deoxidation.
Question 46:
What type of reaction occurs during the oxidation of a metal in metallurgy?
A) Exothermic
B) Endothermic
C) Reduction
D) Hydrolysis
Answer: A) Exothermic
Explanation: The oxidation of metals is typically an exothermic reaction, releasing heat as the metal reacts with oxygen.
Question 47:
Which of the following processes can be used for the separation of copper from its ore?
A) Electrolysis
B) Amalgamation
C) Smelting
D) All of the above
Answer: D) All of the above
Explanation: Copper can be separated from its ore through various methods, including electrolysis, amalgamation, and smelting.
Question 48:
What is “electrowinning”?
A) A process for alloying metals
B) A method for extracting metals from solutions
C) A technique for purifying gases
D) A method for melting metals
Answer: B) A method for extracting metals from solutions
Explanation: Electrowinning is a process that involves using electrolysis to recover metals from their aqueous solutions, commonly used in gold and copper extraction.
Question 49:
What is the main purpose of annealing in metallurgy?
A) To increase hardness
B) To relieve internal stresses
C) To improve wear resistance
D) To promote corrosion
Answer: B) To relieve internal stresses
Explanation: Annealing is a heat treatment process used to relieve internal stresses in metals, improve ductility, and refine the grain structure.
Question 50:
Which of the following is an example of a precious metal?
A) Iron
B) Copper
C) Gold
D) Aluminum
Answer: C) Gold
Explanation: Gold is classified as a precious metal due to its rarity, economic value, and use in jewelry and currency.
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