1. Copper is mostly used in:
(A) Roofing
(B) Construction
(C) Plumbing
(D) Electrical equipment
2. Gold, silver, copper and carbon are example of:
(A) Neutron
(B) Electron
(C) Element
(D) Carbon
3. Brass is an alloy made up of copper and:
(A) Water
(B) Carbon
(C) Sulphur
(D) Zinc
4. Copper and aluminum have effect on magnet of:
(A) Attract
(B) Repel
(C) Both attract and repel
(D) No effect
5. Due to its high heat exchange rate, copper is used in:
(A) All of them
(B) Refrigerator
(C) AC
(D) Dispenser
6. Symbol of copper is:
(A) Al
(B) Fe
(C) Cu
(D) Cr
7. Color of copper is:
(A) Reddish
(B) Brown
(C) Reddish grey
(D) Silvery white
8. Melting point of copper is:
(A) 800°C
(B) 1000°C
(C) 1083°C
(D) 1200°C
9. Formula of cuprite is:
(A) Cu₂O₂
(B) CuO
(C) CuS
(D) Cu₂O
10. Formula of malachite is:
(A) CuFeS₂
(B) Cu₂O
(C) Cu₂S
(D) CuCO₃
11. In smelting process the percentage of copper is:
(A) 6%
(B) 4%
(C) 2%
(D) 8%
12. If an alloy having less than 4% copper is called:
(A) Poor ore
(B) Blister copper
(C) Matte
(D) None of these
13. In matte the percentage of copper is:
(A) 25%
(B) 60%
(C) 45%
(D) 35%
14. For the concentration of copper ore the process used is:
(A) Calcination
(B) Roasting
(C) Froth floatation
(D) Distillation
15. In blast furnace roasted ore is heated by:
(A) Coal
(B) Air
(C) Sand
(D) All of these
16. Matte is a mixture of:
(A) Cu₂S and FeS
(B) FeO and Cu₂O
(C) FeS and CuO
(D) CuS and FeS
17. Furnace used for copper extraction is:
(A) Blast furnace
(B) Bessemer converter
(C) Electrical furnace
(D) Open hearth furnace
18. Blister copper’s purity is:
(A) 97%
(B) 98%
(C) 99%
(D) 96%
19. Most widely used process for making pure metals from impure metals is:
(A) Bessemerization
(B) Refining process
(C) Smelting
(D) All of these
20. Alloy of copper is:
(A) Zinc
(B) Brass
(C) Lead
(D) Graphite