Q.1

Rayon is a __________ fibre.

  • cellulosic
  • polyamide
  • polyester
  • natural
Q.2

Pick out the wrong statement.

  • For the manufacture of styrene, the major raw materials are benzene and ethylene.
  • One inportant copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres.
  • Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis.
  • Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available.
Q.3

Polyurathane can not be used for making

  • mattresses & foam
  • coating material
  • adhesives
  • bottles
Q.4

Polypropylene compared to polythene is

  • harder
  • stronger
  • lighter
  • all (a), (b) and (c)
Q.5

Low pressure Zeigler process of polythene manufacture

  • employs a pressure of 30 kgf/cm2.
  • achieves an yield of 95-98% based on ethylene.
  • produces very low density polythene.
  • does not use any catalyst for polymerisation.
Q.6

Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are

  • 50°C and 3 - 4 kg/cm2
  • 50°C and 1 kgf/cm2
  • 250°C and 10 kgf/cm2
  • 250°C and 1 kgf/cm2
Q.7

Bristles of tooth brushes are made of

  • nylon-6
  • nylon-66
  • polystyrene
  • PVC
Q.8

Pick out the wrong statement.

  • Cold SBR is superior as compared to hot SBR.
  • Polymerisation temperature can modify the properties of SBR.
  • Production of cold SBR employs lower pressure as compared to that of hot SBR.
  • None of these.
Q.9

Alkyd resin can not be used for making

  • plasticiser
  • paint & varnish
  • fibres
  • film forming materials
Q.10

The monomer for the production of neoprene rubber is

  • acetylene
  • chloroprene
  • isoprene
  • none of these
Q.11

A copolymer is formed by the combination of two or more monomer molecules

  • in a chain without the elimination of water.
  • with the elimination of small amount of water.
  • of the same monomer by elimination of small molecules of water.
  • none of these.
Q.12

Valcunisation of rubber decreases its

  • tensile strength.
  • resistance to organic solvents.
  • tackiness.
  • working temperature range.
Q.13

Plastic articles are normally produced by __________ moulding.

  • green sand
  • injection
  • shell
  • dry sand
Q.14

Molecular weight of polymers are in the range of

  • 10 to 103
  • 102-107
  • 107-109
  • 109-1011
Q.15

Styrene which is a monomer for the production of polystyrene, is commercially produced by the

  • catalytic dehydrogenation of ethyl benzene.
  • dehydration of ethyl alcohol followed by hydrogenation.
  • reacting ethylene oxide with acetal-dehyde.
  • fermentation of starch.
Q.16

Commercial production of polypropylene employs __________ polymerisation.

  • emulsion
  • suspension
  • solution
  • bulk
Q.17

The rate controlling step in the manufacture of silicone rubber is the

  • polymer termination step.
  • condensation of siloxane to silicone.
  • initial hydrolysis of silicone monomer.
  • none of these.
Q.18

__________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).

  • Unsaturated polyester
  • Alkyd resins
  • Saturated polyester
  • Amino resins
Q.19

Which of the following is an elastomer ?

  • Thiokol
  • Phenol formaldehyde
  • Urea formaldehyde
  • Polystyrene
Q.20

Polystyrene is a __________ plastic at room temperature.

  • ductile
  • brittle
  • malleable
  • none of these
Q.21

Amino resins are used in paper treatment to improve its

  • wet tear and bursting strength.
  • folding endurance
  • wet rub resistance
  • all (a), (b) & (c)
Q.22

Starting material for the production of butadiene in India is

  • naphthalene
  • benzol
  • ethyl alcohol
  • phthalic anhydride
Q.23

Pick out the wrong statement.

  • Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre.
  • Crimp is a measure of the difference between the length of the straightened and unstraightend fibre.
  • Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
  • Nylon fibres have greater water absorption capacity than polyester fibres.
Q.24

Thermoplastic resins usually

  • remain hard as long as they are hot.
  • can not be reclaimed from waste.
  • permanent setting resins.
  • less brittle than thermosetting resins.
Q.25

Thermocole (expanded polystyrene) is not used for

  • low temperature thermal insulation as in refrigerator and air conditioners.
  • accoustic control and ceiling for building.
  • high temperature thermal insulation in furnaces.
  • packing of delicate electronic gadgets.
Q.26

The physical state in which polymers exist is

  • melts & rubber like state.
  • amorphous glassy state.
  • partially crystalline state.
  • all (a), (b) and (c).
Q.27

Buna-S is also called

  • polyurathane
  • SBR
  • teflon
  • bakelite
Q.28

Main constituent of cotton fibre is

  • lignin
  • cellulose
  • starch
  • gelatine
Q.29

Orlon is

  • a copolymer.
  • a condensation polymer.
  • obtained by polymerising vinyl cyanide.
  • all (a), (b) and (c).
Q.30

Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an

  • rigid foam
  • engineering plastic
  • thermosetting polymer
  • spongy rubber
Q.31

Diphenylamine is added to rubber to

  • valcanise it.
  • protect it from deterioration on exposure to air.
  • make it non-inflammable.
  • make it thermosetting.
Q.32

Which of the following is not a thermoplastic material ?

  • Epoxy polymer
  • PVC
  • Polystyrene
  • Polythene
Q.33

Vulcanisation of raw rubber makes it

  • soft
  • less elastic
  • plastic
  • tacky
Q.34

Nitrile rubber is produced by the polymerisation of

  • acrylonitrile & butadiene.
  • acrylonitrile & styrene.
  • isobutylene & isoprene.
  • none of these.
Q.35

Starting material for the production of SBR is

  • ethyl alcohol
  • ethylene
  • both (a) & (b)
  • neither (a) nor (b)
Q.36

Lavatory cisterns are normally made of

  • expanded polystyrene
  • saturated polyester
  • perspex
  • PVC
Q.37

Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?

  • Ammonium alum
  • Potassium alum
  • both a & b
  • neither a nor b
Q.38

Celluloid is

  • cellulose acetate
  • regenerated cellulose
  • cellulose nitrate
  • cellulose acetate butyrate
Q.39

The synthetic fibres produced from __________ are known as rayon.

  • lignin
  • cellulose
  • polyamides
  • ethylene glycol
Q.40

Which of the following is a copolymer ?

  • PVC
  • Bakelite
  • Polythene
  • Teflon
Q.41

Orlan fibre which is used as a wool sub stitute is

  • an amorphous polymer.
  • a natural polymeric fibre.
  • polyacrylonitrile.
  • polymethylmethacrylate (PMMA).
Q.42

Plasticisers are added to synthetic plastics to

  • impart flexibility.
  • improve workability during fabrication.
  • develop new improved properties not present in the original resin.
  • all (a), (b) and (c).
Q.43

Which of the following low molecular weight (<104 ), soft & waxy polymer is used in chewing gum ?

  • Cellulose acetate
  • Polyvinyl acetate
  • Thiokol
  • PVC
Q.44

The main use of butadiene is

  • as a plasticiser for unsaturated polyester.
  • in the manufacture of synthetic rubber.
  • as an anti-skimming agent in paint.
  • none of these.
Q.45

Automobile steering wheels are normally made of

  • cellulose acetate
  • cellulose nitrate
  • PVC
  • high density polythene
Q.46

Styrene butadiene rubber (SBR) as compared to natural rubber has

  • poor tensile strength.
  • poorer resistance.
  • greater amount of heat build up heavy loading.
  • all (a), (b) ana (c).
Q.47

Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to

  • protect rubber goods from attack by oxygen & ozone present in the atmosphere.
  • reduce its viscosity to permit easier processing.
  • reduce the time of vulcanisation and quantity of vulcanising agent.
  • increase its viscosity.
Q.48

Density of high density polythene is about __________ gm/c.c.

  • 1.18
  • 1.05
  • 0.95
  • 0.99
Q.49

Nylon-6 is manufactured from

  • caprolactum.
  • adipic acid and hexamethylene diamine.
  • maleic anhydride and hexamethylene diamine.
  • sebasic acid and hexamethylene diamine.
Q.50

Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its

  • elasticity
  • strength
  • plasticity
  • weathering characteristics
0 h : 0 m : 1 s