Metallurgical Operations Test 1

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:Silicon is main constituent of

Answers Choices:

Alloys

Rocks

Animals

Vegetables

Questions 2 of 50

Question:Ore pitch blende is main source of

Answers Choices:

\(Ra\)

\(Ce\)

\(Th\)

\(Mg\)

Questions 3 of 50

Question:Which of ore is metalloid

Answers Choices:

\(As\)

\(Na\)

\(Au\)

\(Fe\)

Questions 4 of 50

Question:A mineral is called an ore if

Answers Choices:

Metal present in mineral is precious

Metal can be extracted from it

Metal can be extracted profitably from it

Metal cannot be extracted from it

Questions 5 of 50

Question:Chile saltpetre” is an ore of

Answers Choices:

Iodine

Sodium

Bromine

Magnesium

Questions 6 of 50

Question:Which of the following metal is not found in free state

Answers Choices:

\(Na\)

\(Au\)

\(Ag\)

\(Pb\)

Questions 7 of 50

Question:Which of the following ore is used for industrial extraction of aluminium in India

Answers Choices:

Corundum

Keolin

Cryolite

Bauxite

Questions 8 of 50

Question:Bauxite is an oxide ore of

Answers Choices:

Barium

Boron

Bismuth

Aluminium

Questions 9 of 50

Question:Which metal is not silvery white

Answers Choices:

\(Ni\)

\(Cu\)

\(Na\)

\(Sn\)

Questions 10 of 50

Question:Azurite is an ore of

Answers Choices:

\(Ag\)

\(Cu\)

\(Pt\)

\(Au\)

Questions 11 of 50

Question:Copper can be extracted from

Answers Choices:

Kupfernickel

Dolomite

Galena

Malachite

Questions 12 of 50

Question:Which of the following ore is called malachite

Answers Choices:

\(C{u_2}S\)

\(CuC{O_3}.Cu{(OH)_2}\)

\(C{u_2}O\)

\(CuC{O_3}\)

Questions 13 of 50

Question:Among the following statements, the incorrect one is

Answers Choices:

Calamine and siderite are carbonates

Argentite and cuprite are oxides

Zinc blende and pyrites are sulphides

Malachite and azurite are ores of copper

Questions 14 of 50

Question:Which one of the following ores is a chloride

Answers Choices:

Horn silver

Zincite

Bauxite

Felspar

Questions 15 of 50

Question:Aluminium is most abundant in earth crust yet it is obtained from bauxite because

Answers Choices:

Bauxite is available in larger quantity

Of easy extraction of aluminium from it

Bauxite contains maximum aluminium

Bauxite is less impure

Questions 16 of 50

Question:An ore of potassium is

Answers Choices:

Bauxite

Solomite

Carnallite

Cryolite

Questions 17 of 50

Question:Indicate the mineral from which copper is manufactured

Answers Choices:

Galena

Cuprite

Sphalerite

Chalcopyrite

Questions 18 of 50

Question:The principal ores of silver are argentite, horn silver and pyrargyrite. Their formula respectively are

Answers Choices:

\(A{g_2}S,\,AgCl\) and \(AgSb{S_2}\)

\(AgCl,\,AgSb{S_2}\) and \(A{g_2}S\)

\(AgSb{S_2},\,A{g_2}S\) and \(AgCl\)

\(AgCl,\,A{g_2}S\) and \(AgSb{S_2}\)

Questions 19 of 50

Question:The most important ore of tin is

Answers Choices:

Cassiterite

Cryolite

Cerussite

None of these

Questions 20 of 50

Question:Important ore of Mg is

Answers Choices:

Gypsum

Carnalite

Magnatide

Carnolite

Questions 21 of 50

Question:Bauxite ore is concentrated by

Answers Choices:

Froth flotation

Electromagnetic separation

Chemical separation

Hydraulic separation

Questions 22 of 50

Question:In extraction of copper, we use

Answers Choices:

\(C{u_2}S\)

Pyrites

Silver argentocyanide

\(CuFe{S_2}\)

Questions 23 of 50

Question:Which metal is most difficult to be extracted from its oxide

Answers Choices:

\(Cs\)

\(Ag\)

\(Zn\)

\(Mg\)

Questions 24 of 50

Question:Copper pyrites are concentrated by

Answers Choices:

Electromagnetic method

Gravity method

Froth floatation process

All the above methods

Questions 25 of 50

Question:When lime stone is heated strongly, it gives off \(C{O_2}\). In metallurgy this process is known as

Answers Choices:

Calcination

Roasting

Smelting

Ore dressing

Questions 26 of 50

Question:Electric furnaces are lined with magnesia because

Answers Choices:

It is not affected by acids

It gives oxygen on heating

It melts at very high temperature

It has no effect of electricity

Questions 27 of 50

Question:Purpose of smelting of an ore is

Answers Choices:

To oxidise it

To reduce it

To remove vaporisable impurities

To obtain an alloy

Questions 28 of 50

Question:Smelting is done in

Answers Choices:

Blast furnace

Muffle furnace

Open–hearth furnace

Electric furnace

Questions 29 of 50

Question:Reverberatory furnace is employed in the metallurgical process mainly for

Answers Choices:

Reduction of oxide ores

Smelting of sulphide ores

Conversion of chloride to sulphate

Getting magnetic materials

Questions 30 of 50

Question:In metallurgy, flux is a substance used to convert

Answers Choices:

Infusible impurities to fusible material

Soluble impurities to insoluble impurities

Fusible impurities to infusible impurities

Mineral into silicate

Questions 31 of 50

Question:In the manufacture of iron lime stone added to the blast furnace, the calcium ion ends in the form of

Answers Choices:

Slag

Gangue

Calcium metal

\(CaC{O_3}\)

Questions 32 of 50

Question:Flux added in the extraction of iron is

Answers Choices:

Silica

Felspar

Limestone

Flint

Questions 33 of 50

Question:In the modern blast furnaces, the charge consists of a mixture of

Answers Choices:

Calcined iron oxides + lime + anthracite coal

Calcined iron oxides + limestone + coke

Hydrated iron oxides + dolomite + coke

Iron pyrites + lime +bituminous coal

Questions 34 of 50

Question:Roasting involves

Answers Choices:

Only volatilisation of volatile impurities

Only volatilisation of volatile impurities and decomposition of the ore

Volatilisation of volatile impurities and decomposition and oxidation of the ore

Oxidation and reduction of the ore and slag formation

Questions 35 of 50

Question:Which of the following ores is subjected to roasting during metallurgical operations for getting the metal oxide

Answers Choices:

Horn silver

Zinc blende

Malachite

Limonite

Questions 36 of 50

Question:A metal obtained directly by roasting of its sulphide ore is

Answers Choices:

\(Cu\)

\(Pb\)

\(Hg\)

\(Zn\)

Questions 37 of 50

Question:Blast furnace is employed in the smelting of oxide ore with coke and flux in the metallurgy of

Answers Choices:

Iron

Copper

Lead

All the above

Questions 38 of 50

Question:How is limestone used in Fe extraction

Answers Choices:

Oxidation of Fe ore

Reduction of Fe ore

Formation of slag

Purification of Fe formed

Questions 39 of 50

Question:Heating mixture of \(C{u_2}O\) and \(C{u_2}S\) will give

Answers Choices:

\(Cu + S{O_2}\)

\(Cu + S{O_3}\)

\(CuO + CuS\)

\(C{u_2}S{O_3}\)

Questions 40 of 50

Question:Heating of ore in presence of air to remove sulphur impurities is called

Answers Choices:

Calcination

Roasting

Smelting

None of these

Questions 41 of 50

Question:Which one of the following metals is extracted by thermal reduction process?

Answers Choices:

Copper

Iron

Aluminium

Magnesium

Questions 42 of 50

Question:Chemical reduction is not suitable for converting

Answers Choices:

Bauxite into aluminium

Cuprite into copper

Haematite into iron

Zinc oxide into zinc

Questions 43 of 50

Question:In alumino–thermite process, aluminium is used as

Answers Choices:

Oxidising agent

Flux

Reducing agent

Solder

Questions 44 of 50

Question:Which metal is extracted by electrolytic reduction method

Answers Choices:

\(Cu\)

\(Al\)

\(Fe\)

\(Ag\)

Questions 45 of 50

Question:Aluminium is produced on a large scale by electrolysis of alumina, dissolved in fused cryolite and a little fluorspar. These two electrolytes, cryolite and fluorspar are respectively

Answers Choices:

\(N{a_3}Al{F_6}\) and \(Ca{F_2}\)

\(Al{F_3}\) and \(KF\)

\(A{l_2}{C_6}\) and \(KCl\)

\(KCl.MgC{l_2}.6{H_2}O\) and \(Mg{F_2}\)

Questions 46 of 50

Question:Electrometallurgy is used for

Answers Choices:

Transition metals

Most reactive metals

Noble metals

Soft metals

Questions 47 of 50

Question:The metal extracted by electrolysis of its fused salt is

Answers Choices:

Iron

Lead

Sodium

Copper

Questions 48 of 50

Question:Zone refining is a method to obtain

Answers Choices:

Very high temperature

Ultra pure Al

Ultra pure metals

Ultra pure oxides

Questions 49 of 50

Question:Which one of the following is manufactured by the electrolysis of fused sodium chloride

Answers Choices:

\(NaOH\)

\(NaClO\)

\(Na\)

\(NaCl{O_3}\)

Questions 50 of 50

Question:A metal which is refined by poling is

Answers Choices:

Sodium

Blister copper

Zinc

Silver