Q.1

Iron ore hametite is concentrated using

  • electro magnetic separation mainly.
  • gravity separation.
  • froth floatation.
  • roasting.
Q.2

Refractory bricks burnt at very high temperature have got

  • greater resistance to corrosion by slags.
  • less resistance to corrosion by slags.
  • high spalling tendency.
  • none of these.
Q.3

Glauber's salt is chemically

  • calcium sulphate
  • potassium sulphate
  • potassium chlorate
  • none of these
Q.4

Sodium bisulphite is used for __________ water.

  • deaeration
  • dechlorination
  • both (a) & (b)
  • neither (a) nor(b)
Q.5

Anion exchanger is regenerated usually with

  • NaOH
  • H2SO4
  • hydrazine
  • alum solution
Q.6

Lindane is

  • not a fumigant.
  • BHC (Benzene Hexa Chloride) containing 99% γ-isomer.
  • a by-product of BHC manufacture.
  • both(b) and (c).
Q.7

Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

  • is prone to thermal decomposition.
  • has high water solubility and is unstable.
  • is soluble in ammonium chloride and potassium chloride solution.
  • all (a), (b) and (c).
Q.8

Presence of sodium tripolyphosphate (an additive) in synthetic detergent

  • facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions).
  • inhibits its corrosive effects.
  • does not allow redeposition of dirt on the cleaned surface.
  • none of these.
Q.9

A mixture of chlorine & sodium bromide acts as a/an

  • insecticides
  • analgesic drug
  • fire retardant
  • hydrogenation catalyst
Q.10

Oil produced by solvent extraction

  • has low free fatty acid content.
  • is odourless.
  • both (a) &(b).
  • neither (a) nor (b).
Q.11

Litharge is

  • lead oxide
  • zinc oxide
  • zinc sulphide
  • cellulosic photographic material
Q.12

Bakelite is chemically known as

  • polyvinyl chloride (PVC)
  • polybutadiene
  • phenol formaldehyde
  • polyurathane
Q.13

Use of hydrated lime in water treatment

  • before filtration, reduces the bacterial load on filters.
  • after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2.
  • is to adjust the pH value.
  • all (a), (b) and (c).
Q.14

Percentage of glycerene present in the spent lye obtained during soap manufacture is about

  • 0.5
  • 5
  • 20
  • 35
Q.15

The ideal pulp for the manufacture of paper should have high __________ content.

  • cellulose
  • lignin
  • both (a) & (b)
  • none of these
Q.16

Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about

  • 0.1 to 0.5
  • 1 to 5
  • 5 to 10
  • 15 to 25
Q.17

Nylonis so named because the

  • average degree of polymerisation of the polymer is 1966.
  • number of carbon atoms between two nitrogen atoms are 6.
  • number of nitrogen atoms between two carbon atoms are 6
  • polymer was first synthesised in 1966.
Q.18

Zeolite is used in the

  • water treatment.
  • glass manufacture.
  • hydrogenation of fatty oil as a catalyst.
  • development of exposed photographic plate.
Q.19

Permanent hardness of water can be removed by

  • simply boiling.
  • adding alum.
  • passing it through cation & anion exchangers.
  • all (a), (b) and (c).
Q.20

Nitrile rubber is produced by the polymerisation of

  • acrylonitrile and butadiene.
  • acrylonitrile and styrene.
  • isobutylene and isoprene.
  • none of these.
Q.21

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.22

Riboflavin is a/an

  • vitamin
  • analgesic drug
  • anaesthetics
  • anti-malarial drug
Q.23

__________ is the major constituent of the Portland cement.

  • Calcium carbonate
  • Calcium oxide
  • Tricalcium silicate
  • Calcium sulphate
Q.24

Which of the following is a bleaching agent added in the detergents to facilitate removal of stains caused due to blood, tea etc?

  • Sodium silicate
  • Sodium borate
  • Sodium tripolyphosphate (STPP)
  • Caustic soda
Q.25

Dense soda ash used in the manufacture of glass, is chemically represented by

  • Na2CO3
  • Na2CO3.10H2O
  • Na2CO3.H2O
  • Na2HCO3
Q.26

High acid value of an oil or fat is an indication of

  • storage under improper conditions.
  • absence of unsaturation.
  • its smaller molecular weight.
  • none of these.
Q.27

Coagulant is used __________ filtration.

  • before
  • after
  • during
  • to avoid
Q.28

__________ are added in lacquers to remove film brittleness and to improve adhereness.

  • Film forming materials
  • Plasticisers
  • Diluents
  • Solvents
Q.29

Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine ?

  • Na2CO3
  • NaHCO3
  • H2
  • none of these
Q.30

Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an

  • explosive
  • soap
  • detergent
  • analgesic drug
Q.31

Blue vitriol is chemically

  • copper sulphate
  • ferrous sulphate
  • copper nitrate
  • aluminium sulphate
Q.32

Higher vicosity index of a lubricating oil denotes

  • less changes in fluidity of oil with temperature.
  • substantially high change in fluidity of oil with temperature.
  • its unsuitability under varying temperature conditions .
  • none of these.
Q.33

Carborundum consists mainly of

  • bauxite
  • silicon carbide
  • boron carbide
  • calcium carbide
Q.34

Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.

  • 10
  • 25
  • 50
  • 98
Q.35

At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.

  • independent of
  • directly proportional to
  • inversely proportional to
  • proportional to the square of
Q.36

Potassium is kept & transported under

  • water
  • liquid ammonia
  • kerosene oil
  • alcohol
Q.37

Wet chlorine gas produced during electrolysis of brine is dehydrated by

  • spraying 66° Be H2SO4 counter current to the flow of the gas.
  • passing it through a bed of diatomaceous earth.
  • passing it through a bed of silica gel.
  • none of these.
Q.38

Thermoplastic materials

  • do not soften on application of heat.
  • are heavily branched molecules.
  • are solvent insoluble.
  • none of these.
Q.39

Flash point of most vegetable oils is about __________ °C.

  • 50
  • 100
  • 200
  • 300
Q.40

Catalytic oxidation of naphthalene produces

  • styrene
  • phenol
  • phthalic anhydride
  • none of these
Q.41

Reverse osmosis is normally used for the

  • separation of isotopes of uranium from gaseous uranium hexaflouride.
  • separation of helium from natural gas.
  • desalination of brackish water to produce potable (drinking) water.
  • purification of oxygen.
Q.42

Yeast is used in the manufacture of

  • pencillin
  • antibiotics
  • wine
  • pasteurised milk
Q.43

oleum comprises offree

  • SO2
  • H2SO3
  • SO3
  • H2SO4
Q.44

Washing of coal is done to

  • remove the inherent impurities.
  • remove the adhering impurities.
  • reduce the ash content.
  • both(b) and (c).
Q.45

Phthalic anhydride is made by the

  • oxidation of naphthalene.
  • oxidation of benzene.
  • dehydrogenation of ethyl benzene.
  • none of these.
Q.46

Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.

  • 80
  • 90
  • 98
  • 100
Q.47

Trinitro-toluene (TNT) is

  • used in glycerine manufacture.
  • an explosive.
  • used in dye manufacture.
  • none of these.
Q.48

Le-Blanc process is a primitive process for the manufacture of

  • caustic soda
  • soda ash
  • bromine from sea water
  • hydrochloric acid
Q.49

Wax is a

  • mixture of glycerides.
  • mixture of esters of polyhydric alcohols excepting glycerine.
  • liquid at room temperature.
  • mixture of glycerides of fatty acids.
Q.50

Which of the following is a constituent of vinegar ?

  • Around 10% alcohol
  • Around 1% acetic acid
  • Both (a) and (b)
  • Neither (a) nor (b)
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