Polymer Technology

211. The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is

1. Polyvinyl alcohol
2. Polyvinyl acetate
3. Polyvinyl butyral
4. PVC

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212. The monomer for the production of neoprene rubber is

1. Acetylene
2. Chloroprene
3. Isoprene
4. None of these

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213. The monomer of natural rubber is

1. DMT
2. Isoprene
3. 2 methyl-1 propane
4. Both (B) and (C)

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214. The monomer of poly vinyl chloride (PVC) is

1. Chloroethane
2. Ethylene dichloride
3. Ethyl chloride
4. Chloroform

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215. The only natural thermoplastic resin, which is a product of animal life is

1. Rosin
2. Shellac
3. Amber
4. Copal

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216. The organic acid monomer in nylon-66 is

1. Sebacic acid
2. Terephthalic acid
3. Adipic acid
4. Benzoic acid

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217. The physical state in which polymers exist is

1. Melts & rubber like state
2. Amorphous glassy state
3. Partially crystalline state
4. All (A), (B) and (C)

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218. The process involved in converting rubber into a thin sheet or coating it on fabric is called

1. Extrusion
2. Mastication
3. Calendaring
4. Vulcanisation

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219. The rate controlling step in the manufacture of silicone rubber is the

1. Polymer termination step
2. Condensation of siloxane to silicone
3. Initial hydrolysis of silicone monomer
4. None of these

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220. The repeating units of PTFE are

1. Cl₂CH-CH₃
2. F₂ C = CF₂
3. F₃ C-CF₃
4. FClC = CF₂

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