Question 91:
Which of the following metals is used in the production of dental alloys?
A) Zinc
B) Gold
C) Lead
D) Silver
Answer: B) Gold
Explanation: Gold is commonly used in dental alloys due to its biocompatibility, corrosion resistance, and aesthetic properties.
Question 92:
What is the main purpose of using a refractory material in metallurgy?
A) To improve conductivity
B) To insulate against heat
C) To withstand high temperatures
D) To enhance alloy properties
Answer: C) To withstand high temperatures
Explanation: Refractory materials are designed to withstand high temperatures without melting or breaking down, making them essential in furnaces and reactors.
Question 93:
Which of the following processes is commonly used to extract lithium?
A) Electrolysis
B) Froth flotation
C) Leaching
D) Carbon reduction
Answer: C) Leaching
Explanation: Lithium is often extracted from brine or ore through leaching processes, which dissolve lithium compounds for further processing.
Question 94:
What is the primary use of zirconium in metallurgy?
A) Electrical wiring
B) Nuclear reactors
C) Construction materials
D) Jewelry
Answer: B) Nuclear reactors
Explanation: Zirconium is used in nuclear reactors due to its low neutron absorption and excellent corrosion resistance.
Question 95:
Which of the following methods can be used to reduce titanium oxide to titanium metal?
A) Kroll process
B) Hall-Héroult process
C) Amalgamation
D) Electrolysis
Answer: A) Kroll process
Explanation: The Kroll process involves reducing titanium tetrachloride (TiCl4) with magnesium to produce titanium metal.
Question 96:
What is the primary method used for refining gold?
A) Amalgamation
B) Electrolysis
C) Leaching
D) Smelting
Answer: B) Electrolysis
Explanation: Electrolysis is a common method for refining gold, especially when high purity is required.
Question 97:
What is the main advantage of using high-carbon steel?
A) Low cost
B) High ductility
C) Increased hardness
D) Corrosion resistance
Answer: C) Increased hardness
Explanation: High-carbon steel is known for its increased hardness, making it suitable for tools and high-strength applications.
Question 98:
Which of the following metals is most commonly used in electrical applications due to its high conductivity?
A) Iron
B) Copper
C) Zinc
D) Aluminum
Answer: B) Copper
Explanation: Copper is widely used in electrical applications due to its excellent electrical conductivity and resistance to corrosion.
Question 99:
What is the main purpose of using a flux in metallurgical processes?
A) To increase temperature
B) To purify metals
C) To facilitate melting
D) To remove impurities
Answer: D) To remove impurities
Explanation: Flux is used in metallurgical processes to combine with impurities and help remove them from molten metal, improving the quality of the final product.
Question 100:
Which of the following metals is used to produce superalloys for aerospace applications?
A) Iron
B) Nickel
C) Cobalt
D) All of the above
Answer: D) All of the above
Explanation: Nickel, cobalt, and iron are all used to produce superalloys, which are essential for high-temperature and high-stress aerospace applications.
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