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MCQs 1: Prussian blue is chemically represented by__________________?

FeO.TiO2 Ca SO4 . 2H2O Fe4 [Fe (CN6)3] AlF3 . 3NaF
Answer Explanation

MCQs 2: Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used_______________________?

As a lubricant As a rust preventive In hard water for cleaning of cloth As a foam depressant in distillation column
Answer Explanation

MCQs 3: Air used in aerobic fermentation must be sterilized, otherwise the ___________________?

Recovery of product will be difficult Contamination of pure culture would result Uniformity of product cannot be achieved None of these
Answer Explanation

MCQs 4: Lime and soda ash are added to water to remove ___________________?

Bicarbonates & sulphates of calcium and magnesium Undesirable taste and odour Bacteria Its corrosiveness
Answer Explanation

MCQs 5: Process conditions in fermentator used for production of penicillin is____________________?

25°C, 2 atm 50°C, l0 atm 30°C, 200 mm Hg (absolute) 90°C, 45 atm
Answer Explanation

MCQs 6: Bromides contained in hot mother liquor is treated with ______________ during manufacture of bromine from sea water ?

SO3 Cl2 NH3 SO2
Answer Explanation

MCQs 7: High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to__________________?

Flocculate the impurities Facilitate fast filtration Both A. and B. Neither A. nor B.
Answer Explanation

MCQs 8: Mannheim furnace is used in the manufacture of_________________?

Hydrochloric acid H2SO4 by Chamber process Calcium carbide Corundum
Answer Explanation

MCQs 9: Varnish does not contain____________________?

Pigment Thinner Dryer Anti-skimming agent
Answer Explanation

MCQs 10: Which of the following coals has the highest calorific value ?

Lignite Sub-bituminous Anthracite Peat
Answer Explanation

MCQs 11: Molecular weights of polymers are in the range of__________________ ?

102 – 102 105 – 109 102 – 107 109 – 1011
Answer Explanation

MCQs 12: Finely ground calcium aluminate & silicate is a/an ____________________?

Cermet Cement Abrasive Explosive
Answer Explanation

MCQs 13: Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of_____________________?

Nitric acid Hydrochloric acid Methyl alcohol Formic acid
Answer Explanation

MCQs 14: The main component of Pyrex glass is_____________________?

Zinc Lead Boron Selenium
Answer Explanation

MCQs 15: Graphite is a/an________________________?

Electrical insulator Allotrope of carbon Moderator used in nuclear reactor Both B. and C.
Answer Explanation

MCQs 16: Calcination of limestone is not done in a ______________ kiln for producing lime ?

Vertical shaft Rotary Fluidised bed Fixed bed
Answer Explanation

MCQs 17: Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because__________________?

Its calorific value is very less Tar neutralises the residual acids present in pitch It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop All A, B. and C.
Answer Explanation

MCQs 18: The terminology ‘BTX’ used in coal tar distillation industry refers to___________________?

Benzol-toluol-xylol Benzol-toluene-xylene Benzene-toluol-xylol Benzene-toluene-xylene
Answer Explanation

MCQs 19: Pick out the endothermic reaction out of the following ?

C+ ½O2 = CO CO + 3H2 = CH4 + H2O CaCO3 = CaO + CO2 CO + ½O2 = CO2
Answer Explanation

MCQs 20: Which of the following is the second major component of cement ?

Al2O3 SiO2 CaO Fe2O3
Answer Explanation

MCQs 21: Phosphate rock is a raw material for the manufacture of____________________?

Phosphoric acid Phosphorous Superphosphates All A , B. and C
Answer Explanation

MCQs 22: Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material ?

Slag cement Glasses Porcelain/Potteries Teflon
Answer Explanation

MCQs 23: Phosphoric acid is prepared from_____________________?

Cryolite Chalcopyrite Rock phosphate None of these
Answer Explanation

MCQs 24: Kaolin is a/an _____________________?

Refractory material Synthetic resin Artificial abrasive Blue pigment
Answer Explanation

MCQs 25: Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda ?

High cost of mercury High specific gravity of mercury Non-availability of high purity mercury Pollution of water stream by mercury
Answer Explanation

MCQs 26: Builders are added in soap to act as___________________?

Cleaning power booster Anti-redeposition agent Corrosion inhibitor Fabric brightener
Answer Explanation

MCQs 27: Sucrose content in the raw juice extracted from sugar cane is about _________________ percent?

1 – 2 15 – 20 50 – 60 80 – 85
Answer Explanation

MCQs 28: Mercury cells for caustic soda manufacture, compared to diaphragm cells___________________?

Require lower initial investment Require more power Produce lower concentration NaOH None of these
Answer Explanation

MCQs 29: Viscose rayon is chemically___________________?

Cellulose nitrate Regenerated cellulose nitrate Cellulose acetate Regenerated cellulose acetate
Answer Explanation

MCQs 30: High temperature carbonisation of coal takes place at __________________ °C?

2000 700 1100 < 500
Answer Explanation

MCQs 31: Gun powder, which is an explosive comprises of charcoal, sulphur and____________________?

Glycerine Salt petre Nitro glycerine Dynamite
Answer Explanation

MCQs 32: Neoprene is a__________________?

Monomer Synthetic rubber Polyester None of these
Answer Explanation

MCQs 33: The drug used in contraceptives is____________________?

Sulfadiazine Mestranol Methyl salicylate Penicillin
Answer Explanation

MCQs 34: Frasch process is for______________________?

Making oxygen Producing helium Mining sulphur Making nitrogen
Answer Explanation

MCQs 35: Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about _____________ °C ?

-53 -103 -183 -196
Answer Explanation

MCQs 36: Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of_____________________?

Calcium sulphate Sodium chloride Sodium sulphate Magnesium chloride
Answer Explanation

MCQs 37: Hard water____________________?

Does not affect the lather formation by soap Is not unfit for drinking purpose Pollutes the water stream All A, B. and C
Answer Explanation

MCQs 38: Nickel is not used as a catalyst in the____________________?

Fischer-Tropsch process Shift conversion Hydrogenation of oil Ostwald’s process of HNO3 manufacture
Answer Explanation

MCQs 39: Which is the most suitable dye for synthetic fibres ?

Acid dye Azoic dye Pigment dye Mordant dye
Answer Explanation

MCQs 40: ______________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant ?

Pyrex Soda lime Lead High silica
Answer Explanation

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