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MCQs 1: Essential oils are usually obtained using__________________?

Steam distillation Extractive distillation Solvent extraction Leaching
Answer Explanation

MCQs 2: All enzymes are made of______________________?

Fats Carbohydrates Proteins Amino acids
Answer Explanation

MCQs 3: Sucrose is a disaccharide consisting of____________________?

Glucose and glucose Glucose and fructose Glucose and galactose Fructose and galactose
Answer Explanation

MCQs 4: Pasteurisation of milk means______________________?

Removal of fatty and albuminous substance from it Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics Inhibiting the growth of micro-organisms without killing them None of these
Answer Explanation

MCQs 5: H2S is scrubbed from refinery gases by absorption using ________________________?

Dilute H2SO4 Ethanol amine Chilled water Tri-butyl phosphate
Answer Explanation

MCQs 6: The gasification reaction represented by, C + H2O = CO + H2, is a/an _________________ reaction?

Exothermic Endothermic Catalytic Autocatalytic
Answer Explanation

MCQs 7: Coke used for the production of calcium carbide should have____________________?

Low ash content Low ignition temperature High electrical resistivity All A , B. and C.
Answer Explanation

MCQs 8: Saponification number of an oil or fat____________________?

Gives an idea about its molecular weight Is inversely proportional to its molecular weight Detects its adulteration All A , B. & C.
Answer Explanation

MCQs 9: Alcohol content in freshly prepared natural and fortified wine may be respectively around ______________ percent ?

7-14 and 14-30 7-14 and 40-50 14 – 30 and 40-50 10 – 20 and 40 – 50
Answer Explanation

MCQs 10: Sulphur removal by heating of pyrite ore in presence of air is called its ____________________?

Reduction Roasting Calcination Smelting
Answer Explanation

MCQs 11: The process involved in converting rubber into a thin sheet or coating it on fabric is called ___________________?

Extrusion Mastication Calendaring Vulcanisation
Answer Explanation

MCQs 12: Liquor poisoning generally occurs due to the presence of _________________ in it ?

Ethyl alcohol Impurities Methyl alcohol Carbonic acid
Answer Explanation

MCQs 13: Silicone is a/an ___________________?

Thermoplastic Inorganic polymer Monomer None of these
Answer Explanation

MCQs 14: Thermosetting materials ______________________?

Are cross-linked molecules Soften on application of heat Are solvent soluble None of these
Answer Explanation

MCQs 15: Roasting of metallurgical ores is done mainly to ___________________?

Dehydrate it Sinter the ore Remove CO2 & H2O Remove arsenic & sulphur
Answer Explanation

MCQs 16: Black liquor is converted into white liquor by __________________________?

Evaporation and burning the concentrate followed by causticisation of products Multi-effect evaporation only Selective liquid extraction Extractive distillation
Answer Explanation

MCQs 17: Which of the following is not an abrasive material ?

Bakelite Pumice Corundum Carborundum
Answer Explanation

MCQs 18: More than 100 percent of _________________ is present in oleum?

SO3 H2SO4 H2SO3 SO2
Answer Explanation

MCQs 19: Co-efficient of thermal expansion of glass is decreased by the addition of _______________ during its manufacture?

CaO MnO2 ZnO FeS
Answer Explanation

MCQs 20: Pick out the wrong statement ?

Kraft method of pulp manufacture can process all types of fibrous raw materials Digestion time for bagasse is less than that for wood base materials Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method None of these
Answer Explanation

MCQs 21: Pick out the true statement pertaining to water treatment ?

Slow sand filters can remove colour completely Activated carbon can be used for taste & odour control without subsequent filtration Application of activated carbon reduces the temporary hardness of water Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Answer Explanation

MCQs 22: Massecuite is a terminology used in the ______________ industry ?

Paint Oil hydrogenation Soap Sugar
Answer Explanation

MCQs 23: Wood charcoal is used for decolouration of sugar, because it _______________ the coloured materials?

Adsorbs Oxidises Reduces Converts
Answer Explanation

MCQs 24: Thermal pyrolysis of ethylene dichloride produces___________________?

Trichloroethylene Vinyl chloride Ethanol amine Ethylene oxide
Answer Explanation

MCQs 25: Pick out the wrong statement?

Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate Glass is decolorized during its manufacture by adding antimony oxide, manganese dioxide or arsenic oxide Ordinary glass is represented chemically by Na2O . CaO . 6SiO2 Red color is imparted to glass by addition of arsenic oxide
Answer Explanation

MCQs 26: Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is___________________?

0.14 0.34 0.94 1.4
Answer Explanation

MCQs 27: Pick out the false statement pertaining to water treatment ?

Aeration of water is effective in CO2 removal The zeolite water softening process reduces the hardness of water by not more than 50% Sodium sulphate or sodium carbonate do not cause hardness in water Water with pH value less than 7, is acidic
Answer Explanation

MCQs 28: Pick out the wrong statement ?

Strongly caking coal should not be used in the Lurgi gasifier Acetylene gas cannot be used for illumination purpose Water gas is called blue gas because of the color of the flame, when it is burnt Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels
Answer Explanation

MCQs 29: Diaphragm electrolytic cell as compared to mercury electrolytic cell_____________________?

Produces 70% NaOH solution Requires less specific power consumption for the production of chlorine Requires lesser investment for similar capacity All A , B. and C
Answer Explanation

MCQs 30: Concentration of sulphide ores is done usually by____________________?

Roasting Smelting Froth floatation Electromagnetic separation
Answer Explanation

MCQs 31: Bleaching of paper pulp is done with__________________?

Activated clay Bromine Chlorine or chlorine dioxide Magnesium sulphite
Answer Explanation

MCQs 32: Pick out the wrong statement ?

Cold rubber (SBR) is superior as compared to hot rubber (SBR) Polymerisation temperature can modify the properties of SBR Production of cold SBR employs lower pressure as compared to that of hot SBR None of these
Answer Explanation

MCQs 33: Which of the following processes is absent in glass manufacturing process ?

Sintering Annealing Shaping or forming Melting
Answer Explanation

MCQs 34: Pick out the wrong statement ?

Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80% Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98% 75% oleum can be produced by distillation of 20% oleum Contact process of sulphuric acid manufacture uses nickel as the catalyst
Answer Explanation

MCQs 35: Pick out the wrong statement pertaining to the soap manufacture?

Transparent soaps are made by cold process Organic pigments are used as colouring materials in the soap manufacture Both laundry as well as toilet soaps are manufactured by hot process Colourless rosin is used in the manufacture of laundry soaps
Answer Explanation

MCQs 36: 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at _____________ °C ?

< 0 10-30 250-280 500-600
Answer Explanation

MCQs 37: Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have___________________?

High electrical insulation properties Sharp melting points Low co-efficient of thermal expansion Compressive strength much greater than their tensile strengths
Answer Explanation

MCQs 38: Pick out the wrong statement?

Azoic dyes are mostly applied on cotton fabrics Basic dyes (e.g. amino derivatives) are applied mostly to paper Mordant dyes are applied mainly to wools None of these
Answer Explanation

MCQs 39: Bromine is used in the preparation of___________________?

Fire extinguishing compounds Fire proofing agents Dyes and antiknock compounds All A , B. and C.
Answer Explanation

MCQs 40: Pick out the wrong statement?

Dry process is used for the manufacture of cement, when the raw material is blast furnace slag Portland cement is made employing wet process Gypsum is added to Portland cement to lengthen its setting time None of these
Answer Explanation

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