Quick revision for PSC: copper (ores, properties, alloys, melting point), brass & bronze ranges, lead and babbitt metal, zinc (galvanising), tin (cassiterite), aluminium (bauxite) and why it’s used in aircraft.
Quick Notes
Use these before attempting the MCQs.
Copper basics
Extracted from malachite and pyrites. Reddish, ductile, malleable and an excellent conductor.
Brass & Bronze
Brass = Cu + Zn (mp 880–930°C). Bronze = Cu + Sn (colour red→yellow, mp ~1005°C).
Lead + Bearings
Lead from galena; molten lead is silvery. Babbitt metal (Pb + Sn + Cu + Sb) is used for bearings.
Zinc, Tin, Aluminium
Zinc for galvanizing (mp 420°C). Tin from cassiterite (mp 231°C). Aluminium ore is bauxite; aircraft use mainly due to lightness.
MCQs
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1) Which metal is extracted from the ores "MALACHITE" and "PYRITES"?
2) What is the colour of copper?
3) Which alloy of copper is made by adding zinc?
4) What is the melting point of copper?
5) Which alloy of copper is made by adding tin?
6) Which alloy is widely used for making motor car radiator cores?
7) What is the melting point range of brass?
8) What is the colour range of bronze?
9) What is the melting point of bronze?
10) Which of the following brass alloy is most ductile?
11) Which metal is extracted from the ore "GALENA"?
12) What is the colour of lead when molten?
13) Which alloy, consisting of lead, tin, copper, and antimony, is commonly used as bearings?
14) Which metal is commonly used for coating on steel to prevent corrosion (galvanized roofing sheets)?
15) What is the melting point of zinc?
16) What metal is produced from cassiterite?
17) What is the melting point of tin?
18) Which one of the following is aluminium ore?
19) Why is aluminium widely used in the aircraft industry?
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