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1) Elastomers are__________________? a. Thermosetting material b. Exemplified by protein derivatives c. Having high flexural strength d. Having very high tensile strength and heat resistance
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2) Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is__________________? a. 7 kgf/cm2 and 70 °C b. 1000 kgf/cm2 and 100°C c. 7 kgf/cm2 and 700°C d. 1 kgf/cm2 (gage) and 70°C
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3) Catalyst used in the production of high density polythene by low pressure Ziegler process is ____________________? a. Aluminium triethyl activated with TiCl4 b. Platinum c. Molybdenum d. Nickel
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4) In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher ___________________? a. Densities b. Melting point c. Tensile strength d. Hardness, rigidity & brittleness
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5) Thermal pyrolysis of ethylene dichloride produces ____________________? a. Trichloroethylene b. Vinyl chloride c. Ethanol amine d. Ethylene oxide
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6) Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the ___________________? a. Electrical insulation purpose b. Tanning of leather c. Strengthening of plaster of Paris d. Decorative laminates
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7) 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? a. Viscose rayon b. Acrylic c. Polyvinyl acetate d. Saturated polyester
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8) Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA) ? a. Perspex b. Lucite c. Plexiglass d. Teflon
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9) Thermosetting resins/polymers as compared to thermoplastic ones are ____________________? a. Soluble in all organic solvents b. More brittle c. Formed by addition polymerisation only d. Easily reshaped & reused
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10) Polyvinyl acetate is never used for making_________________? a. Moulded articles b. Fibres c. Adhesives d. All A., B. & C.
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11) In condensation polymerisation as compared to addition polymerisation____________________? a. The monomers are unsaturated compounds b. No co-product is lost c. The monomers contain two functional groups d. Generally only one monomer is involved
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12) Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres? a. Improving the stretchability b. Dyeing/colouring c. Detergent solution washing d. Glycol soaking
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13) Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6? a. -20 to 25 b. 50 to 75 c. 100 to 150 d. 250-280
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14) Density of low density polythene is about ____________ gm/c.c? a. 0.38 b. 0.56 c. 0.81 d. 0.91
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15) Poly-tetra-fluoro ethylene (PTFE) is known as_________________? a. Dacron b. Teflon c. Bakelite d. Celluloid
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16) Nylon-66 is manufactured from ____________________? a. Adipic acid and Hexamethylene diamine b. Caprolactam c. Maleic anhydride and Hexamethylene diamine d. Dimethyl terephthalate (DMT) and ethylene glycol
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17) Properties of a polymer is affected by the____________________? a. Chain length b. Intermolecular forces c. Both A. and B. d. None of these
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18) In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ? a. PTFE b. Buna-S c. PMMA d. Polycaprolactam
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19) 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________________? a. Terylene b. Polybutadiene c. PVC d. Polypropylene
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20) Polycondensation reaction of polymerisation ___________________? a. Does not produce linear polymers b. Produces only thermoplastic material c. Produces epoxy polymers d. Does not need any catalyst
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