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You Are On Multi Choice Question Bank SET 619
30951. Presence of sodium tripolyphosphate (an additive) in synthetic detergent
(A): facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions). (B): inhibits its corrosive effects. (C): does not allow redeposition of dirt on the cleaned surface. (D): none of these.
30952. Dense soda ash used in the manufacture of glass, is chemically represented by
(A): Na2CO3 (B): Na2CO3.10H2O (C): Na2CO3.H2O (D): Na2HCO3
30953. Reverse osmosis is normally used for the
(A): separation of isotopes of uranium from gaseous uranium hexaflouride. (B): separation of helium from natural gas. (C): desalination of brackish water to produce potable (drinking) water. (D): purification of oxygen.
30954. Hydrazine is largely used
(A): in photographic industry. (B): as rocket fuel. (C): in printing industry.
30955. 'Synthesis gas' meant for the synthesis of organic compound is a variable mixture of
(A): N2 & H2 (B): CO2 & H2 (C): CO & H2 (D): C & H2
30956. Litharge is
(A): lead oxide (B): zinc oxide (C): zinc sulphide (D): cellulosic photographic material
30957. Coagulant is used __________ filtration.
(A): before (B): after (C): during (D): to avoid
30958. 10% oleum comprises of 10% free
(A): SO2 (B): H2SO3 (C): SO3 (D): H2SO4
30959. Use of chlorine in the treatment of sewage
(A): helps in grease separation. (B): increases the biological oxygen demand(BOD). (C): causes bulking of activated sludge. (D): aids in flocculation.
30960. Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
(A): emulsification (B): dispersion (C): precipitation (D): wetting
30961. A unit operation is exemplified by the process of
(A): reduction (B): desorption (C): nitration (D): combustion
30962. The major constituents of glass are
(A): lime, clay and soda ash (B): sand, lime and soda ash (C): silica, alumina and clay (D): silica, alumina and soda ash
30963. Margarine is a/an
(A): fat (B): explosive (C): plasticiser (D): rocket propellant
30964. Oils and fats are converted to soap in a process called
(A): hydrogenation (B): esterification (C): saponification (D): none of these
30965. Glycerine can be obtained from
(A): fat (B): naphthalene (C): cumene (D): sucrose
30966. Blue vitriol is chemically
(A): copper sulphate (B): ferrous sulphate (C): copper nitrate (D): aluminium sulphate
30967. Trinitro-toluene (TNT) is
(A): used in glycerine manufacture. (B): an explosive. (C): used in dye manufacture. (D): none of these.
30968. Thorium is mainly used
(A): for the manufacture of gas mantles. (B): as a fissile fuel in a nuclear reactor. (C): in the manufacture of hydrogen bomb. (D): in the treatment of cancer.
30969. During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
(A): increase the rate of absorption. (B): avoid corrosion. (C): reduce the cooling water circulation rate. (D): none of these.
30970. Good quality of edible salt is obtained from brine by the process of
(A): solar evaporation (B): vacuum evaporation (C): freeze drying (D): electrolysis
30971. Electric bulbs are made of __________ glass.
(A): jena (B): flint (C): crookes (D): pyrex
30972. Which of the following is used as a binding material in soap to improve soap texture ?
(A): Rosin (B): Borax (C): Benzyl acetate (D): Sodium carbonate
30973. An alkali metal salt of palmitic acid is known as
(A): soap (B): metallic soap (C): detergent (D): alkaloid
30974. Washing soda is chemically represented by
(A): Na2CO3 (B): Na2CO3.H2O (C): Na2CO3.10H2O (D): NaHCO3
30975. Magnesium and calcium __________ cause temporary hardness of water.
(A): carbonates (B): bicarbonates (C): phosphates (D): sulphates
30976. Which form of sulphur is the most stable at room temperature ?
(A): Plastic (B): Monoclinic (C): Rhombic (D): Flowers of sulphur
30977. Vegetable oils and fats basically differ in their
(A): density ranges (B): physical state (C): chemical composition (D): chemical properties
30978. Average sulphur content in Indian pyrites is about __________ percent.
(A): 15 (B): 35 (C): 55 (D): 70
30979. Oil is a/an
(A): mixture of glycerides. (B): mixture of glycerides of fatty acids. (C): solid at normal temperature. (D): ester of alcohols other than glycerine.
30980. Which of the following is a constituent of coffee ?
(A): Caffeine (B): Nicotine (C): Calgon (D): Lignin
30981. Which of the following is the main constituent of the mother liquor produced in salt industry ?
(A): Quick lime (B): Salt petre (C): Bromine
30982. Silicon carbide is a/an
(A): adhesive (B): abrasive (C): type of glass (D): brittle material
30983. Oxygen is produced by fractionation of air using __________ process.
(A): either or (B): none of these
30984. Trinitrotoluene (TNT), an explosive, is made by the nitration of
(A): nitrobenzene (B): toluene (C): nitrotoluene (D): benzene
30985. Which of the following is used as a coagulant in treating turbid water ?
(A): Chlorine (B): Ferric sulphate (C): Calcium sulphate (D): Activated carbon
30986. Carborundum consists mainly of
(A): bauxite (B): silicon carbide (C): boron carbide (D): calcium carbide
30987. Wax is a
(A): mixture of glycerides. (B): mixture of esters of polyhydric alcohols excepting glycerine. (C): liquid at room temperature. (D): mixture of glycerides of fatty acids.
30988. Catalyst used in the hydrogenation of oil is
(A): nickel (B): platinum (C): iron (D): alumina
30989. Viscose rayon is
(A): cellulose nitrate. (B): regenerated cellulose nitrate. (C): regenerated cellulose acetate. (D): none of these.
30990. Triple superphosphate is manufactured by reacting
(A): phosphate rock with phosphoric acid. (B): phosphate rock with sulphuric acid. (C): phosphate rock with nitric acid. (D): ammonium phosphate with phosphoric acid.
30991. Use of hydrated lime in water treatment
(A): before filtration, reduces the bacterial load on filters. (B): after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2. (C): is to adjust the pH value. (D): all , and .
30992. Higher vicosity index of a lubricating oil denotes
(A): less changes in fluidity of oil with temperature. (B): substantially high change in fluidity of oil with temperature. (C): its unsuitability under varying temperature conditions . (D): none of these.
30993. Le-Blanc process is a primitive process for the manufacture of
(A): caustic soda (B): soda ash (C): bromine from sea water (D): hydrochloric acid
30994. How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
(A): 500°C (B): 750°C (C): 1000°C (D): 1500°C
30995. Cement setting under water employs a/an __________ process.
(A): hydration (B): decomposition (C): oxidation (D): reduction
30996. __________ are added in lacquers to remove film brittleness and to improve adhereness.
(A): Film forming materials (B): Plasticisers (C): Diluents (D): Solvents
30997. Washing of coal is done to
(A): remove the inherent impurities. (B): remove the adhering impurities. (C): reduce the ash content. (D): both and .
30998. Systemic insecticides
(A): are absorbed throughout the plant. (B): kill insects following external bodily contact. (C): are stomach poisons. (D): emit poisonous vapour.
30999. Dry ice (solidified CO2) is used for the
(A): storage & shipment of frozen foods and ice-creams. (B): liquefaction of permanent gases. (C): liquefaction of natural gas. (D): none of these.
31000. Chemical formula of BHC, which is an insecticide is
(A): C6H6Cl6 (B): C6Cl6 (C): C6H5Cl (D): C6H4Cl2
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