1. The symbol of iron is:
(A) Fe
(B) Cr
(C) Cu
(D) Al
2. Iron has color:
(A) Reddish
(B) Blackish grey
(C) Silver white
(D) Yellow
3. Iron has melting point is:
(A) 1600°C
(B) 1200°C
(C) 1400°C
(D) 1535°C
4. Limonite formula is:
(A) 2Fe2O4
(B) FeS
(C) FeCO3
(D) 2Fe2O3·3H2O
5. The formula of hematite is:
(A) Fe2O3
(B) 2FeO3
(C) FeS
(D) FeCO3
6. Percentage of carbon in pig iron:
(A) 2%
(B) 7%
(C) 5%
(D) 10%
7. Pig iron is also known as:
(A) Cast iron
(B) Alloy of steel
(C) Wrought iron
(D) Impure sulphide
8. Iron is mainly extracted from:
(A) Hematite
(B) Magnetite
(C) Limonite
(D) Iron pyrite
9. After melting pig iron the cooled metal is known as:
(A) Wrought iron
(B) White cast iron
(C) Grey cast iron
(D) Pig iron
10. The furnace used for iron extraction:
(A) Blast furnace
(B) Open hearth furnace
(C) Reverberatory furnace
(D) None of these
11. Conversion of carbon dioxide to carbon monoxide is called:
(A) Exothermic
(B) Endothermic
(C) Isothermal
(D) None of these
12. Wrought iron purity is:
(A) 99.5%
(B) 98%
(C) 98.5%
(D) 99%
13. Percentage of carbon in wrought iron is:
(A) 0.5%
(B) 1%
(C) 0.75%
(D) 0.25%
14. Minimum percentage of carbon is present in:
(A) Steel
(B) Wrought iron
(C) Cast iron
(D) Pig iron
15. Furnace used for wrought iron:
(A) Reverberatory furnace
(B) Blast furnace
(C) None of these
(D) Open hearth furnace
16. Hard type of iron is:
(A) Copper
(B) Aluminum
(C) Steel
(D) Chromium
17. Furnace used for steel making is:
(A) Bessemer converter
(B) Blast furnace
(C) Electrical furnace
(D) Open hearth furnace
18. Slow cooling of hot steel is called:
(A) Annealing
(B) Tempering
(C) Quenching
(D) None of these
19. From open hearth furnace the obtained steel is:
(A) High quality
(B) Low quality
(C) Middle quality
(D) All of these
20. Gas used to maintain temperature of open hearth furnace:
(A) Methane gas
(B) Water gas
(C) Coal gas
(D) Producer gas