Q.1

Parathion and Malathion are

  • pesticides.
  • plasticisers for unsaturated polysters.
  • pain-relieving drugs (analgesic).
  • tranquilisers.
Q.2

Hydrazine is largely used

  • as a starting material for 'hypo'.
  • in photographic industry.
  • as rocket fuel.
  • in printing industry.
Q.3

Liquefaction of gases can not be done by

  • exchange of heat with colder stream.
  • adiabatic expansion through a throttle valve (Joule-Thomson expansion).
  • merely compressing it beyond critical pressure.
  • adiabatic expansion against a piston or in a turbine.
Q.4

Use of chlorine in the treatment of sewage

  • helps in grease separation.
  • increases the biological oxygen demand(BOD).
  • causes bulking of activated sludge.
  • aids in flocculation.
Q.5

Systemic insecticides

  • are absorbed throughout the plant.
  • kill insects following external bodily contact.
  • are stomach poisons.
  • emit poisonous vapour.
Q.6

RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically

  • cyclo trimethylene trinitramine.
  • trinitro resorcinol.
  • cyclo tetramethylene tetranitramine.
  • trinitro benzene.
Q.7

Coke oven gas consists mainly of

  • H2, & CH4
  • CO, & CO2
  • H2, & CO
  • CH4, & CO
Q.8

Thorium is mainly used

  • for the manufacture of gas mantles.
  • as a fissile fuel in a nuclear reactor.
  • in the manufacture of hydrogen bomb.
  • in the treatment of cancer.
Q.9

During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to

  • increase the rate of absorption.
  • avoid corrosion.
  • reduce the cooling water circulation rate.
  • none of these.
Q.10

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

  • 500°C
  • 750°C
  • 1000°C
  • 1500°C
Q.11

Catalyst used in the hydrogenation of oil is

  • nickel
  • platinum
  • iron
  • alumina
Q.12

Viscose rayon is

  • cellulose nitrate.
  • regenerated cellulose nitrate.
  • regenerated cellulose acetate.
  • none of these.
Q.13

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

  • it is very corrosive at elevated temperature.
  • its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced).
  • it decomposes on further increasing the temperature.
  • none of these.
Q.14

Transparent soaps (e.g. Pears) are

  • usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency.
  • metallic soaps with frothing agent and free stearic acid to achieve transparency.
  • metallic soaps with frothing agent from which glycerine has not been recovered.
  • none of these.
Q.15

'Synthesis gas' meant for the synthesis of organic compound is a variable mixture of

  • N2 & H2
  • CO2 & H2
  • CO & H2
  • C & H2
Q.16

Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.

  • emulsification
  • dispersion
  • precipitation
  • wetting
Q.17

Dry ice (solidified CO2) is used for the

  • storage & shipment of frozen foods and ice-creams.
  • liquefaction of permanent gases.
  • liquefaction of natural gas.
  • none of these.
Q.18

Chemical name of 'alum' is

  • barium sulphate.
  • aluminium sulphate.
  • aluminium chloride.
  • calcium sulphate.
Q.19

Good quality of edible salt is obtained from brine by the process of

  • solar evaporation
  • vacuum evaporation
  • freeze drying
  • electrolysis
Q.20

Cement setting under water employs a/an __________ process.

  • hydration
  • decomposition
  • oxidation
  • reduction
Q.21

Triple superphosphate is manufactured by reacting

  • phosphate rock with phosphoric acid.
  • phosphate rock with sulphuric acid.
  • phosphate rock with nitric acid.
  • ammonium phosphate with phosphoric acid.
Q.22

In nylon- the first and second numbers (i.e., respectively designate the number of carbon atoms present in the

  • diamine and the ring.
  • dibasic acid and the ring.
  • diamine and the dibasic acid.
  • none of these.
Q.23

Which of the following fuel gases contains maximum amount of carbon monoxide ?

  • Coke oven gas
  • Water gas
  • Blast furnace gas
  • L.D. converter gas
Q.24

Electric bulbs are made of __________ glass.

  • jena
  • flint
  • crookes
  • pyrex
Q.25

Which of the following is the main constituent of the mother liquor produced in salt industry ?

  • Quick lime
  • Glauber's salt
  • Salt petre
  • Bromine
Q.26

Which form of sulphur is the most stable at room temperature ?

  • Plastic
  • Monoclinic
  • Rhombic
  • Flowers of sulphur
Q.27

Which of the following is used as a binding material in soap to improve soap texture ?

  • Rosin
  • Borax
  • Benzyl acetate
  • Sodium carbonate
Q.28

Silicon carbide is a/an

  • adhesive
  • abrasive
  • type of glass
  • brittle material
Q.29

Chemical formula of BHC, which is an insecticide is

  • C6H6Cl6
  • C6Cl6
  • C6H5Cl
  • C6H4Cl2
Q.30

Vegetable oils and fats basically differ in their

  • density ranges
  • physical state
  • chemical composition
  • chemical properties
Q.31

An alkali metal salt of palmitic acid is known as

  • soap
  • metallic soap
  • detergent
  • alkaloid
Q.32

Oxygen is produced by fractionation of air using __________ process.

  • Linde's
  • Claude's
  • either (a) or (b)
  • none of these
Q.33

A bio-catalyst produced by living cells which acts independent of the cell is called a/an

  • substrate
  • enzyme
  • nutrient
  • none of these
Q.34

Average sulphur content in Indian pyrites is about __________ percent.

  • 15
  • 35
  • 55
  • 70
Q.35

Washing soda is chemically represented by

  • Na2CO3
  • Na2CO3.H2O
  • Na2CO3.10H2O
  • NaHCO3
Q.36

Trinitrotoluene (TNT), an explosive, is made by the nitration of

  • nitrobenzene
  • toluene
  • nitrotoluene
  • benzene
Q.37

Pick out the wrong statement.

  • DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction.
  • Chloral is obtained by the chlorination of ethyl alcohol.
  • Insecticides acting on the insects through the respiratory system are called fumigants.
  • Benzene hexachloride is not a contact insecticide.
Q.38

Oil is a/an

  • mixture of glycerides.
  • mixture of glycerides of fatty acids.
  • solid at normal temperature.
  • ester of alcohols other than glycerine.
Q.39

Magnesium and calcium __________ cause temporary hardness of water.

  • carbonates
  • bicarbonates
  • phosphates
  • sulphates
Q.40

Which of the following is used as a coagulant in treating turbid water ?

  • Chlorine
  • Ferric sulphate
  • Calcium sulphate
  • Activated carbon
Q.41

The product obtained on mixing calcium oxide with water is called

  • quicklime
  • slaked lime
  • milk of lime
  • none of these
Q.42

Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

  • mechanical
  • sulphate/kraft
  • sulphite
  • neutral sulphite semi-chemical
Q.43

Which of the following contains least amount of N2 ?

  • Coke oven gas
  • Blast furnace gas
  • Producer gas
  • Water gas (blue gas).
Q.44

Which of the following is a constituent of coffee ?

  • Caffeine
  • Nicotine
  • Calgon
  • Lignin
Q.45

The major constituent of black liquor generated during paper manufacture is sodium

  • sulphate
  • carbonate
  • hydroxide
  • bi-carbonate
Q.46

In the Solvay process, the product from the calciner is

  • light soda ash
  • dense soda ash
  • sodium bicarbonate
  • dehydrated soda ash
Q.47

Pick out the wrong statement.

  • Pasteurisation of milk involves moderate heating followed by cooling.
  • Bakeries and breweries make use of yeasts.
  • Enzyme is a complex nitrogenous compound.
  • Oils and fats are alkaloids.
Q.48

A unit operation is exemplified by the process of

  • reduction
  • desorption
  • nitration
  • combustion
Q.49

__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.

  • Bauxite
  • Limestone
  • Quartz
  • Manganese
Q.50

Tall oil obtained as a by-product from the black liquor recovery is

  • a black, sticky & viscous liquid.
  • used in the manufacture of greases, emulsions & soaps.
  • composed mainly of rosin & fatty acids.
  • all (a), (b) & (c).
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