1. Ruby and sapphire are oxides of which metal?
a) Copper
b) Tin
c) Iron
d) Aluminium
Answer: d
2. Froth flotation is used in the concentration of which type of ore?
a) Sulphide ores
b) Oxide ores
c) Sulphate ores
d) Chloride ores
Answer: a
3. Stainless steel is an alloy of iron mixed with:
a) Carbon and chromium
b) Carbon and nickel
c) Carbon and manganese
d) All of the above
Answer: d
4. Which is the most abundant metal in the Earth’s crust?
a) Zinc
b) Copper
c) Aluminium
d) Iron
Answer: c
5. Which of the following pairs is incorrect?
a) Haematite – Iron
b) Pitchblende – Copper
c) Monazite – Thorium
Answer: b
6. Bridgmanite is:
a) A mineral found on Mars
b) The Earth’s most abundant mineral
c) An alloy of aluminium
d) A chemical used in metallurgy
Answer: b
7. Ultra-purification of metals is carried out using:
a) Smelting
b) Leaching
c) Zone refining
d) Slag removal
Answer: c
8. Haematite is an ore of:
a) Zinc
b) Iron
c) Lead
d) Manganese
Answer: b
9. The process involving smelting and roasting is called:
a) Cryometallurgy
b) Pyrometallurgy
c) Electrometallurgy
d) Hydrometallurgy
Answer: b
10. Malachite is an ore of:
a) Lead
b) Manganese
c) Mercury
d) Copper
Answer: d
11. Hard steel contains:
a) 2–5% carbon
b) 0.5–1.5% carbon
c) 0.1–0.4% carbon
d) 0.01–0.04% carbon
Answer: b
12. Carnotite is an ore of:
a) Beryllium
b) Chromium
c) Uranium
d) Copper
Answer: c
13. Cast iron contains approximately how much carbon?
a) 3–5%
b) 0.1–0.25%
c) 0.5–1.5%
d) 6–8%
Answer: a
14. Cinnabar is an ore of:
a) Lead
b) Manganese
c) Molybdenum
d) Mercury
Answer: d
15. Shock absorbers are made from steel due to its:
a) Low cost
b) Resistance to rust
c) High elasticity
d) High density
Answer: c
16. Magnetite is an ore of:
a) Beryllium
b) Chromium
c) Iron
d) Lead
Answer: c
17. Type metal used in printing is an alloy of:
a) Lead and copper
b) Lead and antimony
c) Lead and bismuth
d) Lead and zinc
Answer: b
18. Lead(II) sulphide is commonly known as:
a) Borax
b) Epsom salt
c) Galena
d) Brimstone
Answer: c
19. The material used in electric heaters is:
a) Tungsten
b) Nichrome
c) Brass
d) Steel
Answer: b
20. Ilmenite is an ore of:
a) Titanium
b) Copper
c) Lead
d) Manganese
Answer: a
21. German silver contains:
a) Copper, zinc, and nickel
b) Copper, zinc, and silver
c) Copper, zinc, and aluminium
d) Zinc, silver, and nickel
Answer: a
22. Aluminium is extracted from:
a) Mica
b) Copper
c) Bauxite
d) Gold
Answer: c
23. Which metal forms amalgams with other metals?
a) Lead
b) Zinc
c) Mercury
d) Copper
Answer: c
24. The chemical formula of magnetite is:
a) Fe₂O₃
b) Fe₃O₄
c) Fe₂CO₃
d) 2Fe₂O₃·3H₂O
Answer: b
25. Bronze is an alloy of:
a) Copper and zinc
b) Tin and zinc
c) Copper and tin
d) Iron and zinc
Answer: c
26. Which mineral does not contain oxygen?
a) Haematite
b) Bauxite
c) Cryolite
d) Calcite
Answer: c
27. Which of the following is not an alloy?
a) Steel
b) Brass
c) Bronze
d) Copper
Answer: d