WBBSE Class 10 Physical Science MCQ Questions Chapter 8.5 Metallurgy

Well structured WBBSE Class 10 Physical Science MCQ Questions Chapter 8.5 Metallurgy can serve as a valuable review tool before exams.

Metallurgy Class 10 WBBSE MCQ Questions

Multiple choice questions (MCQ) :

Question 1.
Most of the plants contain :
(A) Iron
(B) Zinc
(C) Sodium
(D) Potassium
Answer:
(D) Potassium.

Question 2.
Malachite is mineral containing :
(A) Magnesium
(B) Aluminium
(C) Copper
(D) Tin
Answer:
(C) Copper

Question 3.
The most electropositive alkali metal is :
(A) Li
(B) Na
(C) K
(D) Cs
Answer:
(D) Cs.

Question 4.
Calcium is extracted by the electrolysis of :
(A) CaCl₂ solution
(B) CaSO₄ solution
(C) fused CaCl₂
(D) fused Ca₃(PO₄)₂
Answer:
(C) fused CaCl₂

Question 5.
Which of the following is not the ore of magnesium ?
(A) Carnallite
(B) Dolomite
(C) Gypsum
(D) Magnesite
Answer:
(C) Gypsum.

Question 6.
Magnesium is isolated by the electrolysis of :
(A) fused MgCl₂
(B) MgCl₂ solution
(C) MgSO₄ solution
(D) MgO dissolved in MgCl₂
Answer:
(A) fused MgCl₂

Question 7.
Dolomite is an ore of magnesium and it is :
(A) MgCO₃
(B) MgCO₃, CaCO₃
(C) MgCl₂, KCl, 6H₂O
(D) None of these
Answer:
(B) MgCO₃, CaCO₃

Question 8.
Carnallite is an ore of magnesium and it is :
(A) K₂SO₄, MgSO₄, MgCl₂,6H₂O
(B) MgSO₄, H₂O
(C) MgCl₂,KCl, 6H₂O
(D) None of these
Answer:
(C) MgCl₂,KCl, 6H₂O

Question 9.
Calcium oxide is also called : ……………….
(A) milk of lime
(B) quick lime
(C) lime stone
(D) slaked lime
Answer:
(B) quick lime

Question 10.
One of the important uses of quick lime is :
(A) in bleaching silk
(B) in drying gases and alcohol
(C) as a purgative
(D) in dyeing cotton
Answer:
(B) in drying gases and alcohol

Question 11.
Heating of pyrites to remove sulphur is called as:
(A) Roasting
(B) Calcination
(C) Smeting
(D) Fluxing
Answer:
(A) Roasting.

Question 12.
The element which is some times found in native state is :
(A) Al
(B) Cu
(C) Fe
(D) Mg
Answer:
(B) Cu

Question 13.
The fluorspar is :
(A) CaSO₄
(B) BaSO₄
(C) CaF₂
(D) CaCO₃
Answer:
(C) CaF₂

Question 14.
Which of the following is not the ore of calcium ?
(A) Gypsum
(B) Lime stone
(C) Dolomite
(D) Carnallite
Answer:
(D) Carnallite.

Question 15.
The chief ore of aluminium is :
(A) Feldspar
(B) Bauxite
(C) Mica
(D) Kaolin
Answer:
(B) Bawxite.

Question 16.
Baeyer’s process is used for the purification of :
(A) Boron
(B) Aluminium
(C) Titanium
(D) None of these
Answer:
(B) Aluminium

Question 17.
Alumina is :
(A) acidic
(B) basic
(C) neutral
(D) amphoteric
Answer:
(D) amphoteric

Question 18.
Pin iron is also called :
(A) Wrought iron
(B) Cast iron
(C) Steel
(D) Stainless steel
Answer:
(B) Cast iron

Question 19.
Blast furnace is used in the metallurgy of :
(A) Aluminium
(B) Gold
(C) Iron
(D) Silver
Answer:
(C) Iron

Question 20.
Haematie is :
(A) Fe₃ O₄
(B) Fe₃ O₃
(C) Fe₂ O₃ Cao
(D) None of these.
Answer:
(B) Fe₃ O₃

Question 21.
One of the following is not the ore of copper :
(A) Copper glance
(B) Azurite
(C) Malachite
(D) Corrundum
Answer:
(D) Corrundum

Question 22.
Froth floatation process is used in the metallurgy of :
(A) chloride ores
(B) sulphide ores
(C) oxide ores
(D) amalgam
Answer:
(B) sulphide ores

Question 23.
Which of the following elements is present in haemoglobin ?
(A) Mg
(B) Fe
(C) Cu
(D) Zn
Answer:
(B) Fe

Question 24.
Metal present in insulin is :
(A) Copper
(B) Iron
(C) Zinc
(D) Magnesium
Answer:
(C) Zinc.

Question 25.
In electrorefining of copper, some gold is deposited as :
(A) Anode mud
(B) Cathode mud
(C) Cathode
(D) Electrolyte
Answer:
(A) Anode mud

Question 26.
In blast furnace, the highest temperature is in :
(A) reduction zone
(B) slag formation zone
(C) fusion zone
(D) combustion zone
Answer:
(D) combustion zone

Question 27.
Which is the more pure iron ?
(A) cast iron
(B) pig iron
(C) steel
(D) wrought iron
Answer:
(D) Wrought iron

Question 28.
Which is extensively used for making aeroplane body ?
(A) Zn
(B) Cu
(C) Fe
(D) Al
Answer:
(D) Al

Question 29.
Which alloy does not contain copper ?
(A) mistch metal
(B) bell metal
(C) german silver
(D) delta metal
Answer:
(A) Mistch metal

Question 30.
Percentage of silver in german silver is :
(A) 55
(B) 0
(C) 0.5
(D) 24
Answer:
(B) 0

Question 31.
Which is not mineral ?
(A) sulphur
(B) haematite
(C) petroleum
(D) zincite
Answer:
(C) Petroleum

Question 32.
Electrolysis of molten NaCl produces Na and Cl, because :
(A) Na is oxidised B
(B) C is oxidised
(C) Both are oxidised
(D) none of these are oxidised or reduced
Answer:
(B) Cl is Oxidised

Question 33.
In thermite process which is used as reducing agent ?
(A) carbon
(B) iron
(C) aluminium
(D) zinc
Answer:
(C) aluminium

Question 34.
In cathodic protection of iron which is acting as anode?
(A) iron
(B) magnesium
(C) platinum
(D) H₂O
Answer:
(B) magnesium

Question 35.
The green patches form on the surface of copper is :
(A) CuSO₄
(B) CU(OH)₂
(C) CuO
(D) CuSO₄ . 3 Cu(OH)₂
Answer:
(D) CuSO₄ . 3 Cu(OH)₂

Question 36.
Which alloy among the following Is used In electrical fittings?
(A) German silver
(B) Brass
(C) Alnico
(D) Bell metal
Answer:
(B) Brass

Question 37.
What should be used to remove the green patties formed on the copper surface?
(A) detergent water
(B) lemon juice
(C) sand paper
(D) washing soda
Answer:
(B) lemon juice

Question 38.
Aluminium is responsible for
(A) Wilson’s disease
(B) Hepatitis-B
(C) Alzheimer’s disease
(D) Perkinson’s disease
Answer:
(C) Alzheîmer’s disease

Question 39.
The metal which can be extracted by simply heating the cinnabar ore mains: –
(A) mercury
(B) zinc
(C) copper
(D) iron
Answer:
(A) mercury

Question 40.
What are the constituents of alloy solder?
(A) Lead, Zinc
(B) Copper, tin
(C) Lead, tin
(D) Copper, Zinc
Answer:
(C) Lead, tin

Question 41.
Which metal is extracted by the electrolytic reduction of their molten chlorides or oxides?
(A) sodium
(B) iron
(C) zinc
(D) copper
Answer:
(A) sodium

Question 42.
Two metals which can be extracted by heating their suiphides in air,
(A) Na & Cu
(B) Cu & Ai
(C) K & Zn
(D) Hg & Cu
Answer:
(D) Hg & Cu

Question 43.
Which ore is used as a reducing agent in thermite process?
(A) Chromium
(B) manganese
(C) aluminium
(D) iron
Answer:
(C) aluminium

Question 44.
Food cans are coated with tin and not with zinc because
(A) Zinc has higher melting point than tin
(B) Zinc is costlier than tin
(C) Zinc is more reactive than tin
(D) Zinc is less reactive than tin
Answer:
(C) Zinc is more reactive than tin

Question 45.
Which of the following methods is suitable for preventing an iron fry- 4ng pan from rusting?
(A) Applying grease
(B) Applying paint
(C) Applying a coating of zinc
(D) All of the above
Answer:
(D) All of the above

Question 46.
Activity of the metals (in the reactivity series) decreases in the order:
(A) K > Al > Zn > Au
(B) K > AI > Au > Zn
(C) Au < K < Zn < AI
(D) K > Zn > Au >Al
Answer:
(A) K > Al > Zn > Au

Fill in the Blanks:

1. _______ disease occurs due to abnormal copper metabolism.
Answer:
wilson’s

2. When exposed to moist air for a prolonged time, _______ coloured patches are formed on copper surface.
Answer:
green

3. A shining aluminium surface gradually loses Its shine due to formation of ____
Answer:
aluminium oxide

4. Brass Is an alloy of copper and ____
Answer:
zinc

5. Constantan is an alloy of copper and ____
Answer:
nickel

6. Rusting is faster in presence of _______ ion.
Answer:
chloride

7. Galvanization is the process of applying a thin layer of _______ on ion objects.
Answer:
zinc

8. Metals of _______ activity are extracted by reduction of their oxide with carbon.
Answer:
moderate

9. Haematite is an ore of _______
Answer:
aluminium

10. Duralumin is an alloy of _______
Answer:
aluminium

State whether the following statement is True or False :

1. Aluminium is responsible for Alzheimer’s disease.
Answer:
True

2. Rust is actually hydrated iron oxide.
Answer:
True

3. Cooking utensils made up of aluminium are often anodized
Answer:
True

4. Corrosion of iron can be modeled as a short-circuited electrochemical ceil.
Answer:
True

5. Rusting requires either the presence of air or presence of water.
Answer:
False

6. Lemon juice should not be kept in a copper vessel.
Answer:
True

7. Mercury is extracted by heating its oxide.
Answer:
True

8. In reactivity series of metals, sodium is placed higher than iron.
Answer:
True

9. Stainless steel has a very low carbon content.
Answer:
True

10. Calamine is an ore of calcium.
Answer:
False

11. Bauxite is an ore of zinc.
Answer:
false

12. All the ores are minerals but not all the minerals are ores.
Answer:
True