Polymer Technology

81. Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its

1. Elasticity
2. Strength
3. Plasticity
4. Weathering characteristics

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82. Flexible foam (for mattresses) are usually made of

1. PVC
2. Silicone rubber
3. Polyurethanes
4. Polyamides

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83. Flexible plastic pipes are made of

1. High density polyethylene (HDPE)
2. Low density polyethylene (LDPE)
3. Polypropylene
4. Unsaturated polyester

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84. Glyptal used in the manufacture of paints & lacquers is a _________ polymer.

1. Polyamide
2. Polystyrene
3. Polyester
4. Polyacrylonitrile

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85. Gutta percha rubber is

1. Soft & tacky at room temperature
2. An isomer of natural rubber
3. A thermosetting resin
4. Recovered by coagulation of rubber latex

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86. Hot drink (e.g., tea) cups are usually made of

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

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87. Identify the group in which all the polymers mentioned can be used to make fibres.

1. Butadiene copolymers, Polyamides, Urea-formaldehyde
2. Cellulose derivatives, Polyisoprene, Polyethylene
3. Cellulose derivatives, Polyamides, Polyurethane
4. Polypropylene, Poly vinyl chloride, Silicon

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88. In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer?

1. PTFE
2. Buna-S
3. PMMA
4. Polycaprolactam

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89. In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer?

1. Bakelite (phenol formaldehyde)
2. Polyester
3. Polythene
4. Nylon-6

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90. 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

1. Densities
2. Melting point
3. Tensile strength
4. Hardness, rigidity & brittleness

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