chemical engineering Mcqs
1052. Lime and soda ash are added to water to remove ___________________?
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A. Bacteria

B. Bicarbonates & sulphates of calcium and magnesium

C. Its corrosiveness

D. Undesirable taste and odour

1053. Paper pulp produced by Kraft/sulphate process is__________________ ?
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A. Dark colored

B. Bleached easily

C. Strong fibrous

D. Dull white in color

1054. Presence of H2S in raw water (to be chlorinated) results in the_____________________?
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A. None of these

B. Easy removal of its hardness

C. Reduced softening capacity of zeolite

D. Increased dosage of chlorine to provide a disinfecting residual in the water
1055. Iron ore hematite is concentrated using ____________________?
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A. Gravity separation

B. Froth floatation

C. Roasting

D. Electromagnetic separation mainly

1057. Function of thinner in a paint is to ______________________ ?
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A. Form a protective film

B. Suspend pigments & dissolve film forming materials

C. Prevent gelling of the paint

D. Accelerate the oxidation of oil

1058. Pick out the endothermic reaction out of the following ?
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A. CO + 3H2 = CH4 + H2O

B. CaCO3 = CaO + CO2

C. C+ O2 = CO

D. CO + O2 = CO2

1060. Insulin is an __________________ drug?
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A. Antibiotic

B. Anti-TB

C. None of these

D. Anti-malarial

1063. ______________ is obtained as a by-product in the manufacture of sodium hydroxide using brine ?
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A. Sodium carbonate

B. Chlorine

C. Ammonium chloride

D. Sodium bi-carbonate

1064. The chamber process is______________________?
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A. None of these

B. A batch process for directly producing high strength (98 to 100%) H2SO4

C. Non-catalytic and operates only on pyrites

D. Preferred over contact process for producing 98 to 100% H2SO4 and various oleums

1065. Builders are added in soap to act as___________________?
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A. Corrosion inhibitor

B. Fabric brightener

C. Cleaning power booster

D. Anti-redeposition agent

1066. Graphite is a/an________________________?
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A. Electrical insulator

B. Allotrope of carbon

C. Moderator used in nuclear reactor

D. Both B. and C.
1070. Which is the most suitable dye for synthetic fibres ?
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A. Pigment dye

B. Mordant dye

C. Azoic dye

D. Acid dye
1071. Which of the following fuel gases contains maximum amount of carbon monoxide ?
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A. Coke oven gas

B. Water gas

C. Blast furnace gas

D. L.D. converter gas
1072. Phosphoric acid is prepared from_____________________?
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A. None of these

B. Cryolite

C. Chalcopyrite

D. Rock phosphate
1075. Teflon is___________________?
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A. An inorganic polymer

B. A monomer

C. Phenol formaldehyde

D. Poly tetra-fluoro-ethylene (P.T.F.E.)
1076. Sizing material is incorporated in paper to___________________?
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A. Increase its thickness

B. Increase its flexibility & opacity

C. Impart resistance to penetration by liquids

D. Increase its brightness

1077. White phosphorous is stored under water, because __________________?
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A. It is poisonous

B. It does not react with water

C. Its kindling temperature in dry air is very low

D. It is unstable

1079. In Kraft process of paper manufacture, white cooking liquor consists of caustic soda________________?
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A. Sodium sulphite & sodium carbonate

B. None of these

C. Sodium sulphide & sodium carbonate

D. Sodium sulphite & sodium sulphide

1082. Sulphur addition in soap is done to _____________________?
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A. Improve the soap texture

B. Increase its cleansing action

C. Cure pimples & dandruff

D. Fasten lather formation

1083. Permanent hardness of water can be removed by____________________?
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A. Passing it through cation & anion exchangers

B. All (A), B. and (C)

C. Adding alum

D. Simply boiling

1084. Celluloid is chemically___________________?
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A. Regenerated cellulose

B. Cellulose acetate

C. Cellulose acetate butyrate

D. Cellulose nitrate
1085. Naphthalene is removed from coke oven gas by ________________________?
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A. Scrubbing with wash oil

B. Passing it through electrostatic precipitator

C. Absorbing in ethanolamine

D. Adsorbing on palladium

1086. Haemoglobin is a/an____________________?
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A. Enzyme

B. Protein

C. Amino acid

D. Biological catalyst

1089. Commercially ethylene is produced from naphtha by ______________________?
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A. Pyrolysis

B. Hydrocracking

C. Catalytic dehydrogenation

D. Catalytic cracking

1091. Shrinkage volume in cement setting does not depend upon the _____________________?
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A. Water to cement ratio

B. Drying period

C. Ambient temperature fluctuation

D. Sand to cement ratio
1093. Naphthols are derivatives of________________?
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A. Phenol

B. Methyl amine

C. Xylene

D. Naphthalene
1094. The main use of activated carbon in water treatment is to control ___________________?
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A. Turbidity

B. Taste and odour

C. Bacterial growth

D. None of these

1095. Solvay process is used for the manufacture of____________________?
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A. Soda lime

B. Caustic soda

C. Caustic potash

D. Soda ash
1096. Which of the following is not an insecticide ?
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A. Hydrocyanic acid

B. Nicotine

C. Hexane

D. Sodium fluoride

1098. The difference between saponification value and acid value is____________________?
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A. Constant for all fatty oils

B. Called ester value

C. None of these

D. Always negative

1099. Air used in aerobic fermentation must be sterilized, otherwise the ___________________?
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A. Contamination of pure culture would result

B. None of these

C. Recovery of product will be difficult

D. Uniformity of product cannot be achieved