Q.1

__________ scrap can be recycled & reutilised.

  • Bakelite
  • Epoxy resin
  • Polythene
  • none of these
Q.2

Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.

  • -20 to 25
  • 50 to 75
  • 100 to 150
  • 250-280
Q.3

Nylon-compared to nylon-6 has

  • lower melting point.
  • more abrasion resistant properties.
  • higher hardness.
  • all (a), (b) and (c).
Q.4

Thermosetting resins/polymers as compared to thermoplastic ones are

  • soluble in all organic solvents.
  • more brittle.
  • formed by addition polymerisation only.
  • easily reshaped & reused.
Q.5

The generic chemical name for the class of polymers which are commerically known as nylons is

  • polyolefins
  • polyamide
  • polyacrylate
  • polyurathane
Q.6

Styrene butadiene rubber (SBR) is never used for making

  • coated fabrics
  • front wheel tyres of aeroplanes (i.e., heavy duty tyres)
  • gaskets
  • soles of shoes
Q.7

Ion exchange resins are made of

  • lucite
  • sulphonated bakelite
  • polystyrene
  • teflon
Q.8

Cation exchange resins used in water treatment is made from __________ resin.

  • urea formaldehyde
  • epoxy
  • amino
  • phenolic
Q.9

Properties of a polymer is affected by the

  • chain length.
  • intermolecular forces.
  • branching & cross-linking.
  • all (a), (b).
Q.10

In condensation polymerisation as compared to addition polymerisation

  • the monomers are unsaturated compounds.
  • no co-product is lost.
  • the monomers contain two functional groups.
  • generally only one monomer is involved
Q.11

Bakelite is

  • same as polytetra flouro ethylene (PTFE).
  • an inorganic polymer.
  • same as thermoset phenol formaldehyde.
  • not a polymer.
Q.12

The process involved in converting rubber into a thin sheet or coating it on fabric is called

  • extrusion
  • mastication
  • calendering
  • vulcanisation
Q.13

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

  • 0.38
  • 0.56
  • 0.81
  • 0.91
Q.14

In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is

  • terylene
  • polybutadiene
  • PVC
  • polypropylene
Q.15

Teflon is

  • phenol formaldehyde
  • an inorganic polymer
  • polytetra florouethylene (PTFE)
  • a monomer
Q.16

Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is?

  • 50000
  • 51600
  • 49200
  • 50800
Q.17

Molecular weights of plastics ranges from

  • 1000 to 5000
  • 5000 to 1000
  • 20000 to 25000
  • 109 to l011
Q.18

Non sulphonated hard bakelites are not used for making

  • ion-exchange resins
  • fountain pen barrels
  • formica table tops
  • combs
Q.19

Styrene butadiene rubber is commercially manufactured by

  • bulk polymerisation
  • suspension polymerisation
  • solution polymerisation
  • emulsion polymerisation
Q.20

__________ polythene is most prone to stress-cracking

  • High density
  • Low density
  • Cross-linked
  • Linear low density
Q.21

In nylon-the number 6 represents the total number of

  • carbon atoms in the ring.
  • carbon atoms in the linear polymer chain.
  • nitrogen atoms in the ring.
  • hydrogen atoms in the ring.
Q.22

Which of the following is not a natural polymer ?

  • Nucleic acids e.g. RNA and DNA
  • Polysaccharides
  • Polyisoprene
  • Polyurethane
Q.23

Nylon-6 is a

  • polyamide
  • thermosetting resin
  • polyester
  • none of these
Q.24

Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.

  • improving the stretchability
  • dyeing/colouring
  • detergent solution washing
  • glycol soaking
Q.25

Pickout the wrong statement.

  • Polymers made of only one monomer is called homopolymer.
  • Polymers made of more than one monomer is called copolymer or mixed polymer.
  • Vulcanised rubber is more elastic than natural rubber.
  • The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres.
Q.26

Polycondensation reaction of polymerisation

  • does not produce linear polymers.
  • produces only thermoplastic material.
  • produces epoxy polymers.
  • does not need any catalyst.
Q.27

Cross linked polymers are

  • thermoplastic
  • thermosetting
  • either (a) or (b)
  • fibres only
Q.28

Size range of polymer molecules varies from __________ metre.

  • 10-2 to 10-5
  • 10-4 to 10-7
  • 10-1 to 10-2
  • 10-8 to 10-10
Q.29

Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids ?

  • Starch
  • Cellulose
  • Proteins
  • Nucleic acids
Q.30

Gutta parcha rubber is

  • soft & tacky at room temperature.
  • an isomer of natural rubber.
  • a thermosetting resin.
  • recovered by coagulation of rubber latex.
Q.31

__________ is produced by polymerisation of chloroprene.

  • Thiokol (a polysulphide rubber)
  • Butyl rubber
  • Neoprene
  • Polyurathane rubber
Q.32

Polyvinyl chloride (PVC) is

  • a thermosetting material.
  • a condensation polymerisation product.
  • made by employing emulsion polymerisation.
  • none of these.
Q.33

Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.

  • polyurathane
  • polysulphone
  • polycarbonate
  • polyester
Q.34

Which of the following types of polymers has the strongest inter particle forces ?

  • Elastomers
  • Fibres
  • Thermoplastics
  • Thermosetting polymers
Q.35

Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their

  • molecular sizes.
  • magnitude of intermolecular forces.
  • resistance to heat.
  • polymerisation mechanism.
Q.36

Which of the following is not an elastomer ?

  • Polyisoprene
  • Neoprene
  • Nitrile-butadiene
  • None of these
Q.37

Which of the following is not present in bagasse fibre ?

  • Cellulose
  • Lignin
  • Pentogens
  • None of these
Q.38

__________ practically possess no elasticity.

  • Vulcanite or ebonite
  • Spandex fibre
  • Polysulphide rubber
  • Epoxy resin
Q.39

Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten

  • saturated polyester
  • polyurathane
  • polystyrene
  • either (b) or (c)
Q.40

Bakelite (phenol-formaldehyde) resin can not be used as

  • decorative paint.
  • decorative laminates.
  • electrical insulation.
  • glass reinforced plastics.
Q.41

Acrylonitrile is mainly used in the __________ industry.

  • polymer
  • printing
  • dyeing
  • photographic
Q.42

Collapsible tubes for tooth paste are produced by __________ extrusion.

  • direct
  • indirect
  • impact
  • none of these
Q.43

In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.

  • viscose rayon
  • acrylic
  • polyvinyl acetate
  • saturated polyester
Q.44

Rain coats are made of

  • neoprene
  • PVC
  • polyurathane
  • SBR
Q.45

Condensation polymerisation of __________ produces bakelite.

  • propylene
  • phenol & formaldehyde
  • phenol & acetaldehyde
  • urea & formaldehyde
Q.46

The only natural thermoplastic resin, which is a product of animal life is

  • rosin
  • shellac
  • amber
  • copal
Q.47

Silicone is a/an

  • monomer
  • inorganic polymer
  • thermoplastic material
  • a natural polymer
Q.48

Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but

  • polyacrylonitrile
  • polyamide
  • saturated polyester
  • alkyd resin
Q.49

Nylon-is manufactured from

  • adipic acid and hexamenthylene diamine.
  • caprolactum.
  • maleic anhydride and hexamethylene diamine.
  • dimethyl terephthalate (DMT) and ethylene glycol.
Q.50

The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is

  • polyvinyl alcohol
  • polyvinyl acetale
  • polyvinyl butyral
  • PVC
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