TS 10th Class Physical Science Bits Chapter 11 Principles of Metallurgy

These TS 10th Class Physical Science Bits with Answers Chapter 11 Principles of Metallurgy will help students to enhance their time management skills.

TS 10th Class Physical Science Bits Chapter 11 Principles of Metallurgy

Question 1.
In the polling, of the process taking place is ………………………. . ( )
(A) oxidation
(B) calcination
(C) reduction
(D) metal-metal displacement
Answer:
(A) oxidation

Question 2.
The smelting process involves. ( )
(A) reduction of the ore
(B) blast furnace
(C) the metal or metal sulphide in the molten state
(D) all of these
Answer:
(D) all of these

Question 3.
In the blast furnace after smelting we get – ( )
(A) wrought Iron
(B) cast iron
(C) pig iron
(D) steel
Answer:
(C) pig iron

Question 4.
Calcination is useful for the ore ( )
(A) Fe₂O₃
(B) CuFeS₂
(C) ZnCO₃
(D) ZnS
Answer:
(C) ZnCO₃

Question 5.
The formula of magnetite is ( )
(A) Fe₃O₄
(B) Fe₂O₃
(C) FeCO₃
(D) Al₂O₃
Answer:
(A) Fe₃O₄

Question 6.
The sulphate ore among the following ( )
(A) bauxite
(B) pyrolusite
(C) Argentite
(D) horn silver
Answer:
(C) Argentite

Question 7.
The place where the ore Is kept in the furnace for heating purpose is ( )
(A) hearth
(B) chimney
(C) firebox
(D) body
Answer:
(A) hearth

Question 8.
Far smelting the most suitable furnace is …………………………. . ( )
(A) open-hearth
(B) muffle
(C) blast
(D) all
Answer:
(C) blast

Question 9.
If the ore contains impurities possessing wetting difference, the most suitable dressing method is ( )
(A) liquation
(B) washing with water
(C) hand picking
(D) froth floatation
Answer:
(D) froth floatation

Question 10.
If there Is difference In colour, size etc. of ore particles, then the suitable dressing method is ……………………….. . ( )
(A) hand picking
(B) liquation
(C) washing with water
(D) froth floatation
Answer:
(A) hand picking

Question 11.
Malachite Is ……………………… ore of copper. ( )
(A) chloride
(B) carbonate
(C) oxide
(D) silicate
Answer:
(A) chloride

Question 12.
The slag formed during extraction of iron in blast furnace Is …………………… . ( )
(A) CaSO₄
(B) CaSiO₃
(C) CaSO₄ 1/2H₂O
(D) CuSO₄.5H₂O
Answer:
(B) CaSiO₃

Question 13.
The most pure form of iron Is …………………….. . ( )
(A) pig iron
(B) steel
(C) wrought iron
(D) cast iron
Answer:
(C) wrought iron

Question 14.
Coating of zinc on Iron artides to prevent rusting is called …………………….. . ( )
(A) plating
(B) galvanizing
(C) annealing
(D) none of these
Answer:
(B) galvanizing

Question 15.
The alloy of iron used to make utensils is ( )
(A) nichrome
(B) Alnico
(C) duralumin
(D) stainlessted
Answer:
(D) stainlessted

Question 16.
Litharge is ………………….. ore of lead. ( )
(A) oxide
(B) chloride
(C) sulphide
(D) carbonate
Answer:
(A) oxide

Question 17.
The alloy used as heating element In electrical appliances is ( )
(A) tungsten
(B) alnico
(C) nichmme
(D) steel
Answer:
(C) nichmme

Question 18.
The alloy of iron used In making railway tracks is ( )
(A) seel
(B) nichrome
(C) cobalt
(D) alnico
Answer:
(A) seel

Question 19.
Gangue + flux → ………………………… . ( )
(A) alloy
(B) slag
(C) anode mud
(D) residue
Answer:
(B) slag

Question 20.
An example of a highly reactive metal. ( )
(A) Ag
(B) Pb
(C) Cu
(D) Na
Answer:
(D) Na

Question 21.
An example of a low-reacting metal. ( )
(A) Ca
(B) K
(C) Au
(D) Fe
Answer:
(C) Au

Question 22.
The process of extraction of metals from their ores is called ( )
(A) Isomerism
(B) metallurgy
(C) stoichiometry
(D) electrolysis
Answer:
(B) metallurgy

Question 23.
Group I A elements In the periodic table are called ( )
(A) alkali metals
(B) alkaline earth metals
(C) rare earth metals
(D) metalloids
Answer:
(A) alkali metals

Question 24.
The number of molecules of water of crystallization present in Epsom salt.( )
(A) 10
(B) 5
(C) 7
(D) 2
Answer:
(C) 7

Question 25.
The percentage of Aluminium oxide present in Bauxite Is ( )
(A) 30%-40%
(B) 50%-70%
(C) 75%-90%
(D) 10%-20%
Answer:
(B) 50%-70%

Question 26.
The elements or compounds of the metals which occur in nature in the earth’s crust are called. ( )
(A) allotropes
(B) double compounds
(C) minerals
(D) manures
Answer:
(C) minerals

Question 27.
Rock salt is …………………………. . ( )
(A) NaOH
(B) Na₂CO₃
(C) NaNO₃
(D) NaCl
Answer:
(D) NaCl

Question 28.
The ore of manganese ( )
(A) pyrolusite
(B) galena
(C) pitchblende
(D) bauxite
Answer:
(A) pyrolusite

Question 29.
The oxide ore of thorium Is ( )
(A) Monozite
(B) Litarge
(C) Haematite
(D) Pitchblende
Answer:
(A) Monozite

Question 30.
Steel is an alloy of ( )
(A) Fe + Cu
(B) Fe + Al
(C) Fe + C
(D) Fe+Ni+Cr+Mn
Answer:
(C) Fe + C

Question 31.
A compound which is not an ore of Iron Is ( )
(A) Magnesite
(B) Haematite
(C) Limonite
(D) Magnetite
Answer:
(A) Magnesite

Question 32.
The slag formed In the extraction of iron In blast furnace is ( )
(A) SiO₂
(B) CH₃COONa
(C) CaSiO₃
(D) Na₂SiO₃
Answer:
(C) CaSiO₃

Question 33.
The sulphide ore of iron is ……………………… . ( )
(A) Magnetite
(B) Iron pyrites
(C) Pyrolusite
(D) Haematite
Answer:
(B) Iron pyrites

Question 34.
The process in which the ore is mixed with flux and fuel and strongly heated is ……………. . ( )
(A) calcination
(B) smelting
(C) roasting
(D) froth floatation
Answer:
(B) smelting

Question 35.
The place inside the blast furnace where the ore is kept for heating purposes. ( )
(A) chimney
(B) firebox
(C) cup-cone arrangement
(D) hearth
Answer:
(D) hearth

Question 36.
The name of the furnace employed to extract iron from its ore. ( )
(A) reverberatory furnace
(B) retort furnace
(C) open-hearth furnace
(D) blast furnace
Answer:
(D) blast furnace

Question 37.
The furnaces in which there is no direct contact between the hearth and fire box are ……………… . ( )
(A) blast furnaces
(B) open-hearth furnaces
(C) retort furnace
(D) reverberatory furnaces
Answer:
(C) retort furnace

Question 38.
During smelting, haematite Is ( )
(A) oxidised
(B) promoted
(C) reduced
(D) precipitated
Answer:
(C) reduced

Question 39.
A pyrochemical process in which the ore Is heated in the presence of air or oxygen below its melting point. ( )
(A) roasting
(B) smelting
(C) calcination
(D) distillation
Answer:
(A) roasting

Question 40.
A mineral from which a metal can be extracted economically and conveniently is called …………………… . ( )
(A) Crystal
(B) allotrope
(C) ore
(D) residue
Answer:
(C) ore

Question 41.
A process in which the ore is strongly heated in the absence of air or oxygen is ………………. . ( )
(A) roasting
(B) calcination
(C) smelting
(D) evaporating
Answer:
(B) calcination

Question 42.
This is not a ore of iron ( )
(A) limonite
(B) magnetite
(C) siderite
(D) magnesite
Answer:
(D) magnesite

Question 43.
The smelting process involves ( )
(A) the metal or metal sulphide in the molten state.
(B) reduction of the ore
(C) the blast furnace
(D) all of these
Answer:
(D) all of these

Question 44.
Calcination is useful for the ore. ( )
(A) Fe₂O₃
(B) ZnS
(C) CuFeS₂
(D) ZnCO₃
Answer:
(D) ZnCO₃

Question 45.
In the polling, the process taking place is ( )
(A) oxidation
(B) reduction
(C) calcination
(D) metal displacement
Answer:
(B) reduction

Question 46.
Cinnabar among the following is …………………… . ( )
(A) HgS
(B) HgO
(C) Hg(CO₃)₂
(D) HgS₂
Answer:
(A) HgS

Question 47.
In the blast furnace after smelting we get – ( )
(A) wrought iron
(B) chrome steel
(C) pig iron
(D) stainless steel
Answer:
(C) pig iron

Question 48.
The oxide ore of Aluminium is ( )
(A) magnesite
(B) carnalite
(C) bauxite
(D) dolomite
Answer:
(C) bauxite

Question 49.
Examples of corrosion are : ( )
(A) rusting of iron
(B) tarnishing of silver
(C) green coating on copper vessels
(D) all the above
Answer:
(D) all the above

Question 50.
The process of separation of low boiling metals such as Zn, Hg from high boiling metals during purification is called. ( )
(A) distillation
(B) poling
(C) magnetic separation
(D) electrolytic refining
Answer:
(A) distillation

Question 51.
During extraction of Na from brine, the anode used in the electrolytic cell is …………….. . ( )
(A) steel
(B) nickel
(C) graphite
(D) copper
Answer:
(C) graphite

Question 52.
During extraction of sodium metal from NaCI solution, the cathode is made up of ………… . ( )
(A) nickel
(B) aluminium
(C) graphite
(D) steel
Answer:
(D) steel

Question 53.
During purification of crude metal, the molten metal is stirred with logs of green wooden ……………………… . ( )
(A) poling
(B) liquation
(C) electrolysis
(D) distillation
Answer:
(A) poling

Question 54.
The impure copper obtained from ore during extraction of copper is called ( )
(A) Bronze
(B) phosphor bronze
(C) brass
(D) blister copper
Answer:
(D) blister copper

Question 55.
If the ore particles and the impurities differ in colour, size and shape etc., the process of concentration of ore adopted is ……………………. . ( )
(A) washing
(B) hand picking
(C) froth floatation
(D) magnetic separation
Answer:
(B) hand picking

Question 56.
The method adopted to purify low melting metals by heating and making them flow on a slopy surface is called. ( )
(A) liquidation
(B) poling
(C) distillation
(D) electrolytic refining
Answer:
(A) liquatlon

Question 57.
The process used to concentrate the ores which have no wetting property is – ( )
(A) washing
(B) hand picking
(C) froth floatation
(D) magnetic separation
Answer:
(A) washing

Question 58.
Galeria is an ore of ………………………. . ( )
(A) Zn
(B) Pb
(C) Hg
(D) Al
Answer:
(B) Pb

Question 59.
The most abundant metal in the earth’s crust is ……………………. . ( )
(A) Oxygen
(B) Aluminium
(C) Zinc
(D) Iron
Answer:
(A) Oxygen

Question 60.
The reducing agent in thermite process is ……………………. . ( )
(A) Al
(B) Mg
(C) Fe
(D) Si
Answer:
(A) Al

Question 61.
Which of the following metals can replace copper from a solution of copper sulphate ( )
(A) Silver
(B) gold
(C) zinc
(D) platinum
Answer:
(C) zinc

Question 62.
Which one of the following elements occurs in free state ( )
(A) phosphorus
(B) sulphur
(C) silicon
(D) gold
Answer:
(D) gold

Question 63.
The reactivity of metals Al, Ag and Cu increase in the order of ( )
(A)Al>Cu>Ag
(B)Ag>Cu>Al
(C)Ag>Al>Cu
(D)Cu>Ag>Al
Answer:
(A)Al>Cu>Ag

Question 64.
Which of the following methods Is suitable for preventing an iron article from rusting ( )
(A) applying grease
(B) applying paint
(C) coating of zinc
(D) all the above
Answer:
(B) applying paint

Question 65.
The formula of carnallite is ………………………… . ( )
(A) KCl.MgCl₂.6H₂O
(B) MgCO₃
(C) MgSO₄.7H₂O
(D) CaCO₃.MgCO₃
Answer:
(A) KCl.MgCl₂.6H₂O

Question 66.
………………………. group are called chalcogens. ( )
(A) 13th
(B) 14th
(C) 15th
(D) 16th
Answer:
(D) 16th

Question 67.
During electrolysis of sodium chloride ………………………… gas liberates at the anode. ( )
(A) Hydrogen
(B) Chlorine
(C) Oxygen
(D) Nitrogen
Answer:
(B) Chlorine

Question 68.
Low boiling metals are purified by ……………………… method. ( )
(A) poling
(B) liquation
(C) distillation
(D) electrolytic refining
Answer:
(C) distillation

Question 69.
Rusting of iron is due to …………………….. . ( )
(A) formation of iron oxide
(B) formation of silver sulphide
(C) formation of iron sulphide
(D) formation of iron chloride
Answer:
(A) formation of iron oxide

Question 70.
The substance added to remove the Impurity is ………………………… . ( )
(A) Gangue
(B) Flux
(C) Fuel
(D) None of these
Answer:
(B) Flux

Question 71.
The part of furnace where we keep fuel for burning is …………………….. . ( )
(A) hearth
(B) chimney
(C) firebox
(D) none of these
Answer:
(C) firebox

Question 72.
In ……………………….. furnaces, there Is no direct contact between the hearth and firebox. ( )
(A) Blast
(B) Retort
(C) Reverberatory
(D) None of these
Answer:
(B) Retort

Question 73.
The gas released in calcination is ……………………… . ( )
(A) O
(B) NO₂
(C) SO₂
(D) CO₂
Answer:
(D) CO₂

Question 74.
The method suitable to enrich the sulphide ores is …………………… . ( )
(A) calcination
(B) distillation
(C) roasting
(D) electrolysis
Answer:
(C) roasting

Question 75.
The method suitable for purification of low boiling metals is ……………………. . ( )
(A) calcination
(B) distillation
(C) roasting
(D) electrolysis
Answer:
(B) distillation

Question 76.
Aluminium Is profitable to extract from ……………………. . ( )
(A) hematite
(B) lime stone
(C) cinnabar
(D) bauxite
Answer:
(D) bauxite

Question 77.
Copper do not displace ………………….. from dilute acids. ( )
(A) H₂
(B) O₂
(C) SO₄
(D) H⁺
Answer:
(A) H₂

Question 78.
To extract the metal, the metallic oxide should be ( )
(A) oxidized
(B) burned
(C) electrolysed
(D) reduced
Answer:
(D) reduced

Question 79.
Thermite process involves the reaction of metal oxides with …………………. . ( )
(A) aluminium
(B) copper
(C) oxygen
(D) heat
Answer:
(A) aluminium

Question 80.
Suitable impurities are added to the ore to decrease Its ……………………… . ( )
(A) boiling point
(B) freezing point
(C) melting point
(D) conductivity
Answer:
(C) melting point

Question 81.
The process of obtaining the pure metal from the impure metal Is called …………………. the metal. ( )
(A) extraction
(B) calcination
(C) refining
(D) purification
Answer:
(C) refining

Question 82.
Tarnishing of silver Is due to formation of ………………………. . ( )
(A) Silver oxide
(B) silver hydride
(C) silver sulphide
(D) silver nitrate
Answer:
(C) silver sulphide

Question 83.
Development of green coating on copper is due to ………………….. . ( )
(A) copper oxide
(B) copper sulphate
(C) cupric oxide
(D) copper carbonate
Answer:
(D) copper carbonate

Question 84.
Auto reduction possible with ……………………… ores. ( )
(A) carbide
(B) oxide
(C) sulphide
(D) chloride
Answer:
(C) sulphide

Question 85.
…………………… Is used to carry out pyrochemical process. ( )
(A) furnace
(B) heater
(C) magnetic wheels
(D) winnowing machines
Answer:
(A) furnace

Question 86.
…………………………… furnace has both furnace and hearth separated. ( )
(A) blast
(B) reverberatory
(C) open-hearth
(D) none
Answer:
(B) reverberatory

Question 87.
……………… furnace contains a big chamber for both fuel and ore. ( )
(A) blast
(B) reverberatory
(C) open-hearth
(D) roasting
Answer:
(A) blast

Question 88.
………………. reaction Is used In Joining railings of railway tracks. ( )
(A) Pyrochemical
(B) Smelting
(C) Calcination
(D) Thermite
Answer:
(D) Thermite

Question 89.
The metals which do not burn oxidise even on surface are …………………. . ( )
(A) Silver
(B) gold
(C) platinum
(D) all
Answer:
(D) all

Question 90.
Blister copper is purified by …………………… method. ( )
(A) distillation
(B) liquation
(C) poling
(D) electrolytic refining
Answer:
(C) poling

Question 91.
The ore of calcium metal among the following is …………………… . ( )
(A) Bauxite
(B) Limestone
(C) Rock salt
(D) Haematite
Answer:
(B) Limestone