Polymer Technology

101. Liners of bags are usually made of

1. Polythene
2. PVC
3. Polypropylene
4. Polyesters

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102. Low density polythene as compared to high density polythene is

1. Harder
2. Tougher
3. Chemically inert
4. More flexible

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103. Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is

1. Ni
2. V₂O₅
3. Fe
4. Aluminium triethyl combined with titanium tetrachloride

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104. Low pressure Zeigler process of polythene manufacture

1. Employs a pressure of 30 kgf/cm²
2. Achieves an yield of 95-98% based on ethylene
3. Produces very low density polythene
4. Does not use any catalyst for polymerisation

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105. Main constituent of cotton fibre is

1. Lignin
2. Cellulose
3. Starch
4. Gelatine

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106. Main constituent of natural rubber is

1. Polystyrene
2. Polyisoprene
3. Polybutadiene
4. Poly chloroprene

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107. Mastication of rubber means

1. Its softening
2. A treatment to retard its deterioration due to oxidation
3. Improving its curing rate
4. Depression of its freezing point

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108. Maximum consumption of polymers is in

1. Electrical insulation
2. Toys making
3. Coating and films
4. Packaging

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109. Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the

1. Electrical insulation purpose
2. Tanning of leather
3. Strengthening of plaster of Paris
4. Decorative laminates

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110. Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the _________ fibres.

1. Acrylic
2. Polyester
3. Nylon 6:6
4. Polypropylene

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