|
1) Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids ? a. Starch b. Cellulose c. Proteins d. Nucleic acids
|
||||
|
2) Buna-S is a _______________ material? a. Fibrous b. Plastic c. Resinous d. Rubbery
|
||||
|
3) _______________ practically possess no elasticity? a. Vulcanite or ebonite b. Spandex fibre c. Polysulphide rubber d. Epoxy resin
|
||||
|
4) Low pressure Zeigler process of polythene manufacture____________________? a. Employs a pressure of 30 kgf/cm2 b. Achieves an yield of 95-98% based on ethylene c. Produces very low density polythene d. Does not use any catalyst for polymerisation
|
||||
|
5) Cross linked polymers formed from bi-and trifunctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer ______________ properties? a. Thermoplastic b. Thermosetting c. Elastometric d. Brittleness
|
||||
|
6) Thermoplastic resins usually____________________? a. Remain hard as long as they are hot b. Cannot be reclaimed from waste c. Permanent setting resins d. Less brittle than thermosetting resins
|
||||
|
7) Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from ______________ resins? a. Epoxy b. Phenol formaldehyde c. Urea formaldehyde d. Melamine formaldehyde
|
||||
|
8) Main constituent of cotton fiber is __________________? a. Lignin b. Cellulose c. Starch d. Gelatine
|
||||
|
9) Glyptal used in the manufacture of paints & lacquers is a _____________ polymer? a. Polyamide b. Polystyrene c. Polyester d. Polyacrylonitrile
|
||||
|
10) Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are____________________? a. 50°C and 3 – 4 kg/cm2 b. 50°C and 1 kgf/cm2 c. 250°C and 10 kgf/cm2 d. 250°C and 1 kgf/cm2
|
||||
|
11) Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxidant used in rubber ? a. Carbon b. Alkylated diphenyl amine c. Thiokol d. Magnesium
|
||||
|
12) Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styreneacrylonitrile copolymer with butadiene based elastomer, is a/an__________________? a. Rigid foam b. Engineering plastic c. Thermosetting polymer d. Spongy rubber
|
||||
|
13) Perspex can be used as a substitute of glass. Its monomer is__________________? a. Methyl methacrylate b. DMT c. Butadiene d. Tetrafluoroethylene
|
||||
|
14) Condensation polymerisation of formaldehyde with _____________ does not produce phenolic resin? a. Resorcinol b. Phenol c. Para-cresol d. Melamine
|
||||
|
15) The monomer for the production of neoprene rubber is_________________? a. Acetylene b. Chloroprene c. Isoprene d. None of these
|
||||
|
16) Which of the following polymers belong to the class of formaldehyde resin ? a. Melamine resins b. Teflon c. Dacron d. None of these
|
||||
|
17) Epoxy resins (i.e., epoxide polymers) ? a. Are made by addition polymerisation reaction only b. Contain an epoxy group (fig bellow) at the ends of the polymer c. Are cross-linked polymers only d. Use emulsion polymerisation methods
|
||||
|
18) Nylon-6 is manufactured from _______________? a. Caprolactam b. Adipic acid and Hexamethylenediamine c. Maleic anhydride and Hexamethylenediamine d. Sebacic acid and Hexamethylenediamine
|
||||
|
19) Identify the group in which all the polymers mentioned can be used to make fibres ? a. Butadiene copolymers, Polyamides, Urea-formaldehyde b. Cellulose derivatives, Polyisoprene, Polyethylene c. Cellulose derivatives, Polyamides, Polyurethane d. Polypropylene, Poly vinyl chloride, Silicon
|
||||
|
20) Nylon-6 as compared to nylon 66 has lower ? a. Abrasion resistance b. Thermal stability c. Adhesion to rubber d. Hardness
|
||||
