IRON MCQs 20 min Score: 0 Attempted: 0/20 Subscribe 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
