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MCQs 1: Chloramines are used in water treatment for_____________________?

Disinfection and control of taste & odour Corrosion control Removing turbidity Control of bacteria
Answer Explanation

MCQs 2: Basic oxide is absent in ___________________ glass?

Flint Pyrex Quartz All A, B. & C
Answer Explanation

MCQs 3: Fusion of limestone and ______________ produces high alumina cement?

Sand Bauxite Quicklime Calcite
Answer Explanation

MCQs 4: Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its________________?

Poor oxidation stability and high gum forming tendency Greater tendency of decomposition at elevated temperature Hydrolysis tendency in presence of water All A, B. and C
Answer Explanation

MCQs 5: Hydrogenation of oil/fat does not_________________?

Improve its resistance to rancid oxidation Raise its melting point Remove double bonds None of these
Answer Explanation

MCQs 6: Epoxy resin__________________?

Is a good adhesive Is an elastomer Cannot be used for surface coatings Is a polyester
Answer Explanation

MCQs 7: Temporary hardness of water can be removed by__________________?

Addition of alum (a coagulant) Boiling Filtration (through gravity sand filter) Addition of lime
Answer Explanation

MCQs 8: Which of the following sugars is the sweetest ?

Glucose Fructose Sucrose Lactose
Answer Explanation

MCQs 9: Ethyl alcohol cannot be produced_________________?

From waste sulphite substrate of paper mills By Esterification and hydrolysis of ethylene From molasses None of these
Answer Explanation

MCQs 10: Varnish does not contain_______________?

Thinner Pigment Both A. & B. Neither A. nor B.
Answer Explanation

MCQs 11: Deacon’s method is used for the manufacture of____________________?

Glauber’s salt Common salt Chlorine Graphite electrode
Answer Explanation

MCQs 12: Which of the following is not required in the manufacture of soda ash by Solvay process ?

Ammonia Limestone Nitric acid None of these
Answer Explanation

MCQs 13: Main constituents of natural rubber is____________________?

Polystyrene Polyisoprene Polybutadiene Polychlorophrene
Answer Explanation

MCQs 14: Fluorescent dyes are added in detergents to__________________?

Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics Attain distinctiveness from other brands Act as tarnish inhibitor for metals like German silver None of these
Answer Explanation

MCQs 15: Portland cement consists mainly of__________________?

CaO & SiO2 SiO2 & Al2O3 CaO & Al2O3 CaO & Fe2O3
Answer Explanation

MCQs 16: Alkylbenzene sulfonate (ABS) is a____________________?

Detergent Rubber Pesticide Polyester
Answer Explanation

MCQs 17: Bleaching action of bleaching powder is due to its _____________ properties ?

Reducing Oxidising Disinfecting None of these
Answer Explanation

MCQs 18: Very fine suspended and colloidal impurities are removed from water by a process called___________________?

Sedimentation Coagulation Disinfection Softening
Answer Explanation

MCQs 19: The most economical pulp for the production of newsprint would be the _____________________ pulp?

Ground-wood Sulphate Sulphite Semi-chemical
Answer Explanation

MCQs 20: Esterification reaction___________________?

Produces soap Is reversible Is a reaction between an alcohol and an organic acid All A, B. and C.
Answer Explanation

MCQs 21: Commercial production of calcium carbide requires limestone and __________________ as raw materials?

Coke Sand Soda ash Fuel oil
Answer Explanation

MCQs 22: The most stable allotropic form of phosphorous is the _________________ phosphorous?

White Black Yellow Red
Answer Explanation

MCQs 23: Type of glass used in optical work is the ___________________ glass?

Soda-lime Fibre Lead Borosilicate
Answer Explanation

MCQs 24: Titanium dioxide is a/an ___________________ colour pigment?

White Black Yellow Blue
Answer Explanation

MCQs 25: Fusel oil is a/an_________________?

Essential oil Extract from medicinal herbs Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses) None of these
Answer Explanation

MCQs 26: Bordeaux mixture is a/an________________?

Fertiliser Inorganic fungicide Insecticide Explosive
Answer Explanation

MCQs 27: Concentration of NaOH solution produced by mercury electrolytic cell is about _______________ percent?

10 25 50 98
Answer Explanation

MCQs 28: Solvent used for extraction of oil is_____________________?

Hexane Methyl ethyl ketone Furfural None of these
Answer Explanation

MCQs 29: ______________ is an ore concentrating metallurgical process involving a chemical change?

Electromagnetic separation Froth floatation Roasting None of these
Answer Explanation

MCQs 30: Rotary kiln is not involved in the production of___________________?

Cement Lime from limestone Slaked lime from quick lime None of these
Answer Explanation

MCQs 31: In the manufacture of viscose rayon, the raw material used industrially is ____________________?

Eucalyptus wood Bamboo Bagasse Fine teak wood
Answer Explanation

MCQs 32: Starting raw material for the manufacture of alum is_________________?

Alumina Gypsum Bauxite Ammonium bicarbonate
Answer Explanation

MCQs 33: Plasticisers are added to paints to______________________?

Make it corrosion resistant Make glossy surface Give elasticity & prevent cracking of the film Increase atmospheric oxidation
Answer Explanation

MCQs 34: BHC (Benzene hexachloride) is made by the chlorination of benzene_____________________?

Which is an addition reaction Which is a substitution reaction In absolute dark In presence of sunlight
Answer Explanation

MCQs 35: The combustion reaction, C + O2 = CO2, is__________________?

Exothermic Endothermic Autocatalytic None of these
Answer Explanation

MCQs 36: ___________________ iron is the purest form of iron?

Cast Wrought Pig High silicon
Answer Explanation

MCQs 37: Styrene-butadiene-rubber (SBR) as compared to natural rubber has________________?

Poorer tensile strength Poorer resistance to oxidation Greater amount of heat build-up under heavy loading All A , B. and C.
Answer Explanation

MCQs 38: Impurities present in brine is normally removed by treatment with ?

NH3 and CO2 Lime and soda ash Lime, ammonia and carbon All A , B. and C.
Answer Explanation

MCQs 39: Producer gas consists mainly of________________________?

CO, CO2 N2, H2 CO, H2 H2, CH4 C2H2, CO2, H2
Answer Explanation

MCQs 40: Commonly used glass is known as the _______________ glass?

Flint Hard Pyrex Soda
Answer Explanation

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