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ADITYA INSTITUTE OF TECHNOLOGY AND MANAGEMENT, TEKKALI
(AN AUTONOMOUS INSTITUTE) 2013-14
Multiple Choice Questions for 1st B.Tech Unit-II & III
Subject: ENGINEERING CHEMISTRY
1. Ferrous sulphate is commonly used in treatment of municipal water for [ b ]
a) Filtration
b) Flocculation
c) Sedimentation
d) Screening
2. On boiling hard water for a long time and filtering you get [ b ]
a) Temporary hard water
b) Permanent hard water
c) Both water
d) None of the above
3. Water containing calcium sulphate and calcium bicarbonate is [ c ]
a) Temporary hard water
b) Permanent hard water
c) Both water
d) Soft water
4. The process of allowing water to stand undisturbed in big tanks for settling of the suspended particles due to force of gravity [ c ]
a) Coagulation. B) conditioning c) sedimentation d) screening
5. Disinfection by ozone is due to liberation of [ b ]
a) Oxygen
b) Nascent oxygen
c) Molecular oxygen
d) Oxide
6. The composition of Alum is [ a ]
a) K2SO4.Al2(SO4)3.24H2O
b) K2 (SO4)3.Al2(SO4)3.24H2O
c) K2SO4.Al2(SO4)3.20H2O
d) K2SO4.Al2SO4.24H2O
7. Used permutite is regenerated by treating with [ b ]
a) Sodium hydroxide
b) Sodium chloride
c) Hydrochloric acid
d) Sulphuric acid
8. Alkalinity in water is due to [ d ]
a) OH- ions
b) Hydroxide and carbonate ions
c) Carbonate and bicarbonate ions
d) All the above
9. Boiler corrosion caused by using highly alkaline water in boiler is called [ c ]
a) Corrosion
b) Boiler corrosion
c) Caustic embrittlement
d) Erosion
10. Caustic embrittlement can be avoided by using [ a ]
a) Sodium phosphate b. hydrogen c. ammonium hydroxide d. sedum sulphate.
11. Cation exchange resin is [ b ]
a) Poly acryonitrile co-vinyl chloride polymer rsin
b) Poly styrene sulphuric acid co-polymer resin
c) Poly butadiene polymer resin
d) Poly vinyl chloride resin
12. The polymer membrane used in reverse osmosis process is called [ a ]
a) Cellulose acetate
b) Polymethy methacrylate
c) Polyamide
d) All are possible
13. Hard water is unfit for use in boilers for generating steam because [ d ]
a) steam is generated at high temperature
b) it boiling point is higher
c) water decomposes into H2 and O2
d) It produces scales inside the boiler
14. Common alum is used in water treatment for drinking water for [ d ]
a) Killing the bacteria
b) Coagulation
c) Sedimentation
d) Coagulation and sedimentation
15. Pitting corrosion is the [ a ]
a) Breaking of the oxide layer of the metal
b) Stress present in the metal
c) Difference in aeration
d) All the above
16. Potable or drinking water treatment does not involve [ c ]
a) Sedimentation
b) Disinfection
c) Softening
d) coagulation
17. Oxygen absorption corrosion is mainly due to [ b ]
a) Oxygen alone
b) Oxygen and moisture
c) Oxygen absorbed by metal
d) Occlusion of oxygen gas
18. One of the common sacrificial anodic metal for protection of iron is [ a ]
a) Magnesium a) Manganese c) Tin d) Graphite
19. Generally the machine parts to be protected are [ d ]
a) Curved shapes
b) Different metal parts having nearly same electrode potential are joined
c) Polished surfaces
d) All are possible
20. Calgon is a trade name given to [ b ]
a) Sodium silicate
b) Sodium hexa meta phosphate
c) Sodium meta phosphate
d) Calcium phosphate
21. Underground and soil corrosion are due to [ b ]
a) Bacterial action
b) Difference in porosity of soil
c) Acidity of soil
d) All are possible
22. The method by which the ions are pulled out of salt water by direct current, and employed thin, rigid membrane air is called [ ]
a) Electro dialysis b) Reverse osmosis c) Zeolite d) Ion exchange
23. Sterilization process of drinking water means [ b ]
a) Purification of salts from water
b) Destroying bacteria
c) Making distilled water
d) All the above
24. Disinfection agent is used commonly for treating large quantity of water [ a ]
a) Chlorine gas in water or chloramines
b) Bleaching powder
c) Ozone gas
d) Boiling
25. Estimation of hardness of water by EDTA method is used to determine [ d ]
a) Alkaline hardness
b) Temporary hardness
c) Permanent hardness
a) All the above
26. The formula of chloramines is [ a ]
a) ClNH2 b) NHCl2 c) NCl3 d) NH2Cl2
27. Anion exchange resin is
a) Poly acryonitrile co-vinyl chloride polymer resin [ c ]
b) Poly styrene sulphuric acid co-polymer resin
c) Phenol – formaldehyde resin
d) Poly vinyl chloride resin
28. The metal at the top of the electrochemical series is [ d ]
a) Most stable b) Most noble c) Best protective d) Most active
29. During electrochemical corrosion in the acidic environment [ c ]
a) Oxygen evolution occurs
b) Hydrogen absorption occurs
c) Hydrogen evolution occurs
d) All the above
30. Corrosion is a process of [ c ]
a) Reduction b) electrolysis c) reverse of metal extraction d) neutralization
31. Galvanizing is the process of [ d ]
a) Coating with tin
b) Coating with chromium
c) Coating with nickel
d) Coating with zinc
32. Electroplating is the process of [ a ]
a) Passing d.c current through coated metallic salt or electrolyte
b) A king of spray coating by spray guns
c) Passing electricity through the metal powder
d) All the above
33. Zeolite softening process removes [ c ]
a) only temporary hardness of water
b) only permanent hardness of water
c) both temporary and permanent hardness of water
d) the dissolved gases in permanent hard water
34. Conventional tertiary treatment is [ a ]
a) chemical coagulation and flocculation
b) filtration
c) sedimentation
d) none of these
35. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is[ b ]
a) 600 ppm b)300 ppm c) 1500 ppm d) 1000 ppm
36. Hardness of water does not [ c ]
a) have any bad effect in boiler
b) make cooking of foods difficult
c) make it unfit for drinking
d) cause difficulty in the washing of clothes with soaps
37. Permanent hard water may be softened by passing it through [ c ]
a) sodium silicate
b) sodium bicarbonate
c) sodium carbonate
d) sodium phosphate
38. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with [ d ]
a) 10% calcium chloride solution
b) 10% magnesium sulfate solution
c) 10% magnesium chloride solution
d) 10% sodium chloride solution
39. Temporary hardness of water is caused by the presence of [ c ]
a) chlorides of calcium and magnesium
b) sulfates of calcium and magnesium
c) bicarbonates of calcium and magnesium
d) carbonates of sodium and potassium
40. Secondary treatment uses__________ to consume wastes [ a ]
a) micro-organisms
b) chemicals
c) filtration
d) colloidal mater
41. Permanent hardness of water is caused by the presence of [ c ]
a) bicarbonates of calcium and magnesium
b) carbonates of sodium and potassium
c) chlorides and sulfates of calcium and magnesium
d) phosphates of sodium and potassium
42. According to BIS the maximum permissible limit of dissolved solids in drinking water is
` [ b ]
a) 1000 mg/l b)2000 mg/l c) 1500 mg/l d) 500 mg/l
43. Which of the following chemical is sometime added in the process of coagulation and flocculation? [ a ]
a) Aluminum sulphate
b) Aluminum oxide
c) Calcium chloride
d) None of these
44. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water? [ c ]
a) Chlorination
b) Treating with potassium permagnate
c) UV radiation
d) Treating with bleaching powder
45. The common methods used for disinfection in waste water treatment plants are [ c ]
a) Chlorination b) UV light c) both (a) and (b) d) Phenolic solvent
46. Which of the following substances are commonly used in a filter? [ c ]
a) Charcoal b) Sand c) Both (a) and (b) d) Aluminum chloride
47. The maximum permissible limit (BIS) of turbidity in drinking water is [ b ]
a) 5 NTU b) 10 NTU c) 15 NTU d) 20 NTU
48. Sedimentation is a physical process used in wastewater treatment to [ b ]
a) remove particles that are less dense than water
b) remove particles that are more dense than water
c) remove the pertinacious material from the water
d) none of the above
49. The ultimate source of water is [ c ]
a) rivers and lakes b)dew and forest c)rain and snow d) underground and surface
50. Both temporary and permanent hardness of water can be removed on boiling water with
[ b ]
a) calcium hydroxide b)sodium carbonate c)calcium oxide d)calcium carbonate
51. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
[ a ]
a) 0.05 mg/l b) 0.09 mg/l c) 0.1 mg/l d) 1.0 mg/l
52. The maximum desirable limit (BIS of mercury in the drinking water is [ d ]
a) 0.05 mg/l b) 0.9 mg/l c) 0.1 mg/l d) 0.001 mg/l
53. The purest form of naturally occurring water is [ a ]
a) rain water b) river water c) pond water d) sea water
54. Calgon is used for removal of [ c ]
a) sodium carbonate
b) permanent hardness of water
c) permanent hardness of water
d) none of these
55. When temporary hard water is boiled, one of the substances formed is [ d ]
a) calcium bicarbonate b) calcium sulfate c) hydrogen chloride d) carbon dioxide
56. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as [ b ]
a) insoluble carbonates
b) insoluble zeolites
c) insoluble chlorides
d) insoluble sulfates
57. Both temporary and permanent hardness of water can be removed by [ b ]
a) Boiling b) Distillation c) Filtration d) Decantation
58. Desalination of water is also called [ d `]
a) Hypo filtration b) Hyper filtration c) Super filtration d) b and c
59. 1ppm equal to [ b ]
a) 0.1mg/l b) 0.07 clark degree c) 0,7 clark degree d) 0.01 french degree
60. What is the pH maintained in estimation of hardness by EDTA method [ c ]
a) 7 pH b) 13 pH c) 10 pH d) 5 pH
61. Hard water causes [ d ]
a) Difficulty in washing cloths
b) It is non drinkable
c) Produce scales in the boilers
d) All the above
62. Standard hard water in EDTA method is prepared as follows [ a ]
a) 1 gm of calcium carbonate in 1 litre of distilled water
b) 1 gm of calcium chloride in 1litre of distilled water
c) 1 gm of calcium carbonate in 100ml of distilled water
d) 1 gm of calcium chloride in 100ml of distilled water
63. Stress corrosion is due to [ b ]
a) Stress present in the metal alone
b) Stress and the environment
c) Stress and bacterial action
d) None of the above
64. In sacrificial anode protection [ d ]
a) An artificial cathode is connected to the metal to be protected
b) An anode metal is coated on the surface of the metal to be protected
c) Protection of the metal given by galvanizing the metal
d) An artificial weak anode is connected to the metal to be protected
65. Galvanic corrosion can occur if. [ a ]
a) Metals of different electrode potentials are welded
b) Metal of the nearly same electrode potentials are welded
c) Due to zinc coating
d) None of the above
66. in the electrochemical corrosion [ a ]
a) anode undergo oxidation
b) cathode undergo oxidation
c) anode undergo reduction
d) both cathode and Anode undergo oxidation
67. The deciding factor in atmospheric corrosion is [ b ]
a) presence of oxygen in air
b) humidity of air
c) presence of gases like SO2
d) frequency of rainfall
68. The following metal is used for the cladding of aluminum [ a ]
a) 99.5% pure Al b) 98.5 % pure Al c) 100% pure Al d) 99% pure Al
69. The best way to prevent attack by uniform corrosion is to [ a ]
a) Coat the equipment
b) Select the most expansion material for fabrication
c) Apply cathodic protection whenever necessary
d) Keep a corrosion allowance
70. When zinc is coupled to steel and corrosion is tested in various environments, which one of the following happens? [ b ]
a) The corrosion rate of steel increases while that of zinc is decreased
b) The corrosion rate of zinc is increased while that of steel is decreased
c) The corrosion rates of both decrease
d) The corrosion rates of both increase
71. Steel plates with aluminum rivet are exposed to seawater for ten weeks. What would happen to aluminum rivets? [ c ]
a) The rivets would corrode
b) corrosion is partially eliminated
c) The steel plates would corrode
d) Both would corrode
72. Two dissimilar metals of equal area that are in contact are to be coated but enough coating is on hand with half of the total area. For maximum corrosion protection, which one of the following must be coated? [ d ]
a) half of the anode and half of the cathode
b) Only the cathode
c) Only the anode
d) Both anode and cathode
73. Corrosion is a chemical reaction that involves [ b ]
a) The inside of the object changing from an element to a compound
b) The surface of the object changing from an element to a compound
c) nothing happens
d) The surface of the object changes from one element into another element.
74. Rusting is a special term, given to the corrosion of which metal. [ d ]
a) Zinc b) Copper c) Nickel d) Iron
75. What conditions are required for rusting to take place? [ c ]
a) Water only b)Oxygen only c) Water and oxygen d) Water and carbon dioxide
76. Which of the following is not an example of physical protection? [ c ]
a) Greasing b) Painting c) Electro plating d) None of the above
77. Which of the following metals would protect iron by electrons flowing to the iron,[ a ]
a) Magnesium b) Silver c) Tin d) Copper
78. When objects (gates) are galvanised, what metal is used to protect the iron. [ d ]
a) Aluminium b) Copper c) Nickel d) Zinc
79. What type of protection is galvanising? [ b ]
a) Physical protection
b) Sacrificial protection
c) Physical and sacrificial protection
d) None of the above
80. An impervious coating protects the steel surface by: [ a ]
a) acting as an inert barrier against air, oxygen and carbon dioxide
b) forming a chemical bond with the metal surface
c) acting as a cathode to the steel surface
d) passivating the steel surface
81. Corrosion of metals involves [ b ]
a) Physical reactions (b) Chemical reactions (c) Both (d) None
82. The following factors play vital role in corrosion process [ c ]
a) Temperature (b) Solute concentration (c) Both (d) None
83. Following equation is related to corrosion rate [ a ]
a) Nernst equation (b) Faraday’s equation (c) Either (d) Neither
84. Passivity is due to [ c ]
a) Higher EMF (b) Lower EMF (c) Oxide film (d) All
85. Difficult to monitor and very dangerous form of corrosion [ b ]
a) Galvanic (b) Pitting (c) Crevice (d) Stress
86. This form of corrosion occurs due to concentration difference in a component [ c ]
a) Uniform (b) Galvanic (c) Inter-granular (d) Stress
87. Main form of ceramic degradation [ a ]
a) Corrosion (b) Weathering (c) Dissolution (d) Swelling
88. When Pt and Co are electrically connected, which one gets corroded [ b ]
a) Pt (b) Co (c) None ( d) Can’t decide
89. Which of the following can be used for cathodic protection [ a ]
a) Al (b) Cd (c) Cu (d) Either
90. Passivity is not reason for inertness of the following [ a ]
a) Au (b) Al (c) Ti (d) Ni
91. Which one of the following least promotes corrosion [ d ]
a) Moisture b) Crevices c) Shape d) Thickness of the metal
92. To eliminate the entrapment of moisture, it is advised to [ a ]
a) Make corners smooth
b) Coat the containers
c) Use corrosion resistant alloys
d) Provide a drainage hole
93. Storage containers designed in such a way that [ b ]
a) No crevices
b) No obstacle to drainage occur
c) The design should ensure that the containers are drained in minimum time
d) The containers should be constructed from plastics rather than metal
94. The process of covering steel with tin to prevent it from corrosion is called [ b ]
a) galvanizing b. tinning c. metal cladding d. electro plating
95. Anodic coating protects underlined metal [ b ]
a) due to noble character
b) higher oxidation potential
c) due to its lower oxidation potential
d) due to its higher reduction potential
96. Electroplating is process of depositing a thin layer of [ b ]
a) Superior metal over inferior base metal
b) inferior metal over superior base metal
c) superior metal higher reduction potential
d) inferior metal over inferior base metal
97. The function of ammonium chloride used as flux in galvanization is to [ a ]
a) Prevent oxide formation
b) prevent deposition of impurities
c) reduce the content of base metal and
d) none of the above
98. Sand blasting is used for removing the following from the metal surfaces [ a ]
a) oxide scale b. oils c. greases d. old paints
99. Identify the correct statement [ b ]
a) Rusting is the oxidation of any metal
b) Corrosion is the oxidation of any metal with rusting being about iron only
c) Rusting is the oxidation of any metal
d) None of the above
100. When iron rusts, which of these ion-electron equations is correct? [ c ]
a) Fe(s) → Fe(aq) b)Fe2+(aq) + 2e → Fe(s) c)Fe(s) → Fe2+ + 2e- d) None of the above
101. How does salt speed corrosion? [ b ]
a) Salt contains oxygen
b) Salt is an electrolyte and can carry charged particles
c) Salt is sodium chloride and sodium is reactive
d) None of the above
102. Identify the oxidation equation involved in corrosion. [ b ]
a) Fe2+(aq) + 2e- → Fe(s)
b) Fe2+(aq) → Fe3+(aq) + e-
c) 2H2O(l) + O2(g) + 4e- → 4OH-(aq)
d) None of the above
103. Identify the reduction equation involved in corrosion. [ c ]
a) Fe2+(aq) + 2e- → Fe(s)
b) Fe2+(aq) → Fe3+(aq) + e
c) 2H2O(l) + O2(g) + 4e- → 4OH-(aq)
d) None of the above
104. Magnesium metal can be attached to the steel pipeline to prevent rusting. What name is given to this type of protection provided by magnesium? [ b ]
a) Galvanizing b) Sacrificial c) Anodizing d) None of the above
105. Steel cars can be protected from rusting in a number of ways. Dipping steel in molten zinc can also physically protect steel from rust. Why the steel not rust even if the zinc would is scratched? [ c ]
a) The molten zinc will fill in the scratch
b) Zinc is less reactive than steel and will give electrons to steel
c) Zinc is more reactive than steel and will give electrons to steel
d) None of the above
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