Metallurgy MCQ Quiz - Objective Question with Answer for Metallurgy - Download Free PDF

The correct answer is 1 and 3 only.

Key Points

• Statement 1 is correct: Metals of medium reactivity are commonly extracted from sulphide ores through roasting to convert them into oxides, followed by reduction to extract the metal.
• Statement 3 is correct: Metals of medium reactivity can also be extracted from carbonate ores by calcination, which decomposes the carbonates into oxides, followed by reduction to extract the metal.
• Statement 2 is incorrect: Metals of high reactivity are not directly extracted from sulphide ores by roasting; they are generally extracted through electrolysis of molten compounds.
• Statement 4 is incorrect: Metals of low reactivity are extracted directly from their ores by roasting, not electrolysis, as they do not form compounds requiring electrolysis.
• Hence, only statements 1 and 3 are correct, as they align with the established processes for metal extraction based on reactivity.

Additional Information

• Roasting: A process in which sulphide ores are heated in the presence of oxygen, converting them into oxides. For example, ZnS (zinc sulphide) is roasted to form ZnO (zinc oxide).
• Calcination: A thermal decomposition process where carbonate ores are heated in the absence of air to produce oxides. For example, CaCO₃ (calcium carbonate) is calcined to form CaO (calcium oxide).
• Reduction: The process of extracting metals from their oxides by heating with a reducing agent, such as carbon, or by electrolysis for highly reactive metals.
• Electrolysis: A method used for extracting highly reactive metals like sodium, potassium, and aluminium by passing an electric current through their molten compounds.
• Reactivity Series: A series that ranks metals based on their reactivity. Metals at the top (e.g., potassium, sodium) are highly reactive, while those at the bottom (e.g., gold, platinum) are least reactive.

The Correct answer is Bronze.

Key Points

• Bronze is an alloy primarily made of copper (Cu) and tin (Sn). The typical ratio used is approximately 88% copper and 12% tin.
• This alloy has been in use since the Bronze Age (around 3300 BCE to 1200 BCE), marking a significant advancement in human technology.
• Bronze is known for its strength, durability, and resistance to corrosion, making it suitable for creating tools, weapons, and sculptures.
• The addition of tin to copper reduces its melting point and increases its hardness, which are crucial properties for crafting robust materials.
• It is widely used in the manufacturing of statues, coins, musical instruments, and bearings.
• Some historical artifacts, such as the famous Bronze sculptures from ancient civilizations, showcase the significance of this alloy in early societies.

 Additional Information

• Solder
  • Solder is another alloy, commonly composed of tin (Sn) and lead (Pb). It is primarily used in electronics and plumbing for joining metal components.
  • Solder has a low melting point, making it ideal for creating secure connections without damaging sensitive materials.
• Gold
  • Gold is a pure metal rather than an alloy. It is known for its malleability, ductility, and resistance to tarnish.
  • Gold is widely used in jewelry, electronics, and financial reserves.
• Brass
  • Brass is another alloy, made of copper (Cu) and zinc (Zn).
  • It is known for its golden appearance and is commonly used in decorative items, musical instruments, and plumbing fittings.

The Correct answer is Bronze.

Key Points

• Bronze is an alloy primarily made of copper (Cu) and tin (Sn). The typical ratio used is approximately 88% copper and 12% tin.
• This alloy has been in use since the Bronze Age (around 3300 BCE to 1200 BCE), marking a significant advancement in human technology.
• Bronze is known for its strength, durability, and resistance to corrosion, making it suitable for creating tools, weapons, and sculptures.
• The addition of tin to copper reduces its melting point and increases its hardness, which are crucial properties for crafting robust materials.
• It is widely used in the manufacturing of statues, coins, musical instruments, and bearings.
• Some historical artifacts, such as the famous Bronze sculptures from ancient civilizations, showcase the significance of this alloy in early societies.

 Additional Information

• Solder
  • Solder is another alloy, commonly composed of tin (Sn) and lead (Pb). It is primarily used in electronics and plumbing for joining metal components.
  • Solder has a low melting point, making it ideal for creating secure connections without damaging sensitive materials.
• Gold
  • Gold is a pure metal rather than an alloy. It is known for its malleability, ductility, and resistance to tarnish.
  • Gold is widely used in jewelry, electronics, and financial reserves.
• Brass
  • Brass is another alloy, made of copper (Cu) and zinc (Zn).
  • It is known for its golden appearance and is commonly used in decorative items, musical instruments, and plumbing fittings.

The Correct answer is Bronze.

Key Points

• Bronze is an alloy primarily made of copper (Cu) and tin (Sn). The typical ratio used is approximately 88% copper and 12% tin.
• This alloy has been in use since the Bronze Age (around 3300 BCE to 1200 BCE), marking a significant advancement in human technology.
• Bronze is known for its strength, durability, and resistance to corrosion, making it suitable for creating tools, weapons, and sculptures.
• The addition of tin to copper reduces its melting point and increases its hardness, which are crucial properties for crafting robust materials.
• It is widely used in the manufacturing of statues, coins, musical instruments, and bearings.
• Some historical artifacts, such as the famous Bronze sculptures from ancient civilizations, showcase the significance of this alloy in early societies.

 Additional Information

• Solder
  • Solder is another alloy, commonly composed of tin (Sn) and lead (Pb). It is primarily used in electronics and plumbing for joining metal components.
  • Solder has a low melting point, making it ideal for creating secure connections without damaging sensitive materials.
• Gold
  • Gold is a pure metal rather than an alloy. It is known for its malleability, ductility, and resistance to tarnish.
  • Gold is widely used in jewelry, electronics, and financial reserves.
• Brass
  • Brass is another alloy, made of copper (Cu) and zinc (Zn).
  • It is known for its golden appearance and is commonly used in decorative items, musical instruments, and plumbing fittings.