০১। 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
ক) -5
খ) 10-30
গ) 250-280
ঘ) 500-600
০২। A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of
ক) siloxane elastomers.
খ) polyamides.
গ) vinyl polymers.
ঘ) urea-formaldehyde resins.
০৩। A copolymer is formed by the combination of two or more monomer molecules
ক) in a chain without the elimination of water.
খ) with the elimination of small amount of water.
গ) of the same monomer by elimination of small molecules of water.
ঘ) none of these.
০৪। A copolymer of vinyl and vinylidine chloride is called
ক) treylene
খ) orlon
গ) saran
ঘ) dacron
০৫। Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but
ক) polyacrylonitrile
খ) polyamide
গ) saturated polyester
ঘ) alkyd resin
০৬। Acrylonitrile is mainly used in the __________ industry.
ক) polymer
খ) printing
গ) dyeing
ঘ) photographic
০৭। Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an
ক) rigid foam
খ) engineering plastic
গ) thermosetting polymer
ঘ) spongy rubber
০৮। Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
ক) tensile strength
খ) chemical resistance
গ) flexibility
ঘ) all (a), (b) & (c)
০৯। Addition of stabiliser during PVC manufacture is done to
ক) improve its impact strength.
খ) improve its elasticity.
গ) reduce the melt viscosity & glass transition temperature.
ঘ) prevent its thermal degradation.
১০। Addition polymerisation is not involved in the manufacture of
ক) low density polythene.
খ) poly vinyl chloride.
গ) polystyrene.
ঘ) polyhexamethylene adipamide.
১১। Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.
ক) organic peroxides
খ) sulphuric acid
গ) hydroflouric acid
ঘ) none of these
১২। Alkyd resin can not be used for making
ক) plasticiser
খ) paint & varnish
গ) fibres
ঘ) film forming materials
১৩। Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used
ক) for surface coating of automobiles & air crafts.
খ) for fibre making.
গ) as plasticiser for PVC & nitrocellulose.
ঘ) for film forming materials.
১৪। Alkyd resin is a/an
ক) polyamide
খ) polyester
গ) polyolefin
ঘ) addition polymer
১৫। All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it can not be used for the production of plastic
ক) filaments
খ) pipes
গ) buckets
ঘ) tubings
১৬। Amino resins are used in paper treatment to improve its
ক) wet tear and bursting strength.
খ) folding endurance
গ) wet rub resistance
ঘ) all (a), (b) & (c)
১৭। Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber ?
ক) Carbon
খ) Alkylated diphenyl amine
গ) Thiokol
ঘ) Magnesium
১৮। Automobile steering wheels are normally made of
ক) cellulose acetate
খ) cellulose nitrate
গ) PVC
ঘ) high density polythene
১৯। Bakelite (phenol-formaldehyde) resin can not be used as