QB ME,CE 1 CHAPTER 1 A B C D ANS

The product of blast furnace is called………. Cast iron Wrought iron Pig iron Steel C

2 A B C D ANS

Percentage of carbon in medium steel is …………… 1.5 to 2.5% Up to 0.3% 0.3 to 0.6% More than 0.6% C

3 A B C D ANS

Percentage of carbon in low carbon steel……………… 0.05 to 0.3 % More than 0.6 % 0.6 to 0.8 % 0.3 to 0.6 % A

4 A B C D ANS

Percentage of carbon in high carbon steel……. 0.3 to 0.6 % 0.6 to 1.5 % Up to 0.3 % 0.6 to 0.8 % B

5 A B C D ANS

Stainless steel is so called because of it’s …………. High strength High corrosion resistance High ductility Brittleness B

6 A B C D ANS

The property which enables metals to be drawn in to wire is called as ……… Malleability Ductility Brittleness Castability B

7 A B C D ANS

Brass contains the elements …………… Cu + Pb Cu + Zn Zn + Pb Cu + Hg B

8 A B C

Bronze consist of elements ………. Cu + Pb Sn + Pb Cu + Sn

D ANS 9

Cu + Zn C

A B C D ANS

Naturally occurring substance present in the earth crust contain is known As …….. Mineral Ore Gangue flux A

10 A B C D ANS

A mineral from which metal can be extracted is called as……. Mineral Gangue ore Flux C

11 A B C D ANS

A chemical formula Al2O3 .H2O represents ore…….. Hematite Haematite Bauxite Ferrite C

12 A B C D ANS

Impurities present in ore are ……. Gangue Flux Slag Ore A

13 A B C D ANS

A chemical formula .Fe2O3 represents the ore ……………………. Haematite Bauxite Magnetite Galena A

14 A B C D ANS

A chemical formula ZnS Is representation ……….. Zinc blende Zincite Cinnabar Mica A

15 A B C D ANS

Earthy unwanted impurities present in ore are ……………. Flux Matrix Slag Mineral B

16

There is a process of extraction of metal from ore …………..

A B C D ANS

Ore Flux Metallurgy Gangue C

17 A B C D ANS

The process of removal of gangue from ore is ………….. Oxidation Reduction Smelting concentration D

18 A B C D ANS

The haematite ore is concentrated by the process………… Gravity separation Magnetic separation Froath floatation Roasting A

19 A B C D ANS

Iron is obtained from iron oxide by the use of……………. Oxidising agent Reducing agent Crushing Brushing B

20 A B C D ANS

Ore tinstone is concentrated by the process…………. Calcination Roasting Gravity separation Electrolysis C

21 A B C D ANS

Reduction of the ore is the process carried out by …………. Smelting Poling Liquation Distillation A

22 A B C D ANS

The hot blast of air entering in to furnace through…….. Double cup & cone feeder Twyer Slag Flux B

23 A B

The flux used in blast furnace……….. CaO CaSiO3

C

FeSiO3

D ANS

MgCO3 A

24 A B C D ANS

Purification of metal to get extra pure metal the process is known as… Reduction Calcination Roasting Refining D

25 A B C D ANS

Metals lead & tin are refined by process ………….. Distillation Poling Liquation Electrolytic refining C

26 A B C D ANS

Metals like mercury & zinc are purified by the process ….. Distillation Liquation Electrolytic refining Poling A

27 A B C D ANS

Melting point of iron is …………. 10830c 15300c 2320c 4190c B

28 A

Chemical formula of malachite is……………….. Cu2O

B

MgSO4

C

CuCO3.Cu(OH)2

D ANS

MnO2 C

29 A B C D ANS

Sulphide ore is concentrate by the process ……………… Calcination Gravity separation Roasting Froth floation D

30 A B C D ANS

Roasting is carried out in a furnace ……. Reverberatory furnace Blast furnace Muffle furnace Electric oven A

31 A

Copper matte is the mixture of …………. FeS + Cu2O

B

Cu2S + FeO

C D ANS

Cu2O + Cu2S FeS + FeO B

32 A B C D ANS

The process in which copper matte is converted in to blister copper………. Froth floation Gravity separation Bessemerisation Calcination C

33 A B C D ANS

Blister copper contains copper in it …………. 96 – 98 % 40 – 45 % 60 – 65 % 70 – 80 % A

34 A B C D ANS

In the process of Electrorefining of copper, anode is made up of ………… Carbon Platinum Graphite Copper D

35 A

The electrolyte used in Electrorefining of copper………. 15 % CuSO4 +10 % H2SO4

B C D ANS

15 % H2SO4 10 % KOH 15 % KAg(CN)2 A

36 A B C D ANS

Melting point of pure copper is ……………. 1530C 1083C 420C 232C B

37 A B C D ANS

Copper in pure form has sp.gravity …………. 5.98 9.85 8.95 5.89 C

38 A B C D ANS

Copper reacts with non oxidising acid hydrochloric acid produces…………… Copper sulphate Copper oxide Copper nitrate Cuprous chloride D

39 A B C D ANS

A property of metal in which it can be drawn in to its wires is known as…… Ductility Malleability Weldability Machinability A

40 A B C D ANS

An ability of metal to carry a load without breaking is…………… Brittleness Tensile strength Toughness Hardness B

41 A B C D ANS

Metals combine with mercury to form alloy known as …………. Metalloid Blister copper Amalgam Malachite C

42 A B C D ANS

Alloy is not prepared by method Fusion Reduction Compression Electromagnetic separation D

43 A B C D ANS

Alloy which do not contain iron as main component known as………….. Non ferrous alloy Ferrous alloy Steel Magnetic steel A

44 A B C D ANS

Medium carbon steel contains carbon in it ………… 0.05 TO 0.3 % 0.3 TO 0.6 % 0.06 TO 1.5 % 2.5 TO 4.5 % B

45 A B C D ANS

High carbon steel have tensile strength……. Law Medium Highest None of these C

46 A B C

Solder is an alloy contains ………. Lead & tin Mercury & zinc Iron & carbon

D ANS

Copper & zinc A

47 A B C D ANS

Duralium contains major element ……….. Aluminium Copper Zinc iron A

48 A B C D ANS

Woods metal is used for………. Making alclad sheets Safety plugs of pressure cooker Body of vehicles Ship building A

49 A B C D ANS

Portland cement contains lime in it ………… 00-10 % 5-10 % 17-25 % 60-67 % D

50 A B C D ANS

Chemical formula of lime…………… CaCO3 MgCO3 CaO MgO C