Polymer Technology

161. Polymerisation process in which two or more monomers of chemically different nature take part is called

1. Copolymerisation
2. Addition polymerisation
3. Chain polymerisation
4. None of these

View answer

162. Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E. (poly chloro tetra fluoro ethylene). It is also called

1. Polyurethane
2. Silicone rubber
3. Teflon
4. Epoxy resin

View answer

163. Polymers are

1. Micro-molecules
2. Macromolecules
3. Sub-micromolecules
4. None of these

View answer

164. Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their

1. Molecular sizes
2. Magnitude of intermolecular forces
3. Resistance to heat
4. Polymerisation mechanism

View answer

165. Polymethyl methacrylate (PMMA) which is also known as Perspex and is produced by bulk polymerisation of methyl methacrylate is not a _________ polymer.

1. Thermoplastic
2. Thermosetting
3. Linear
4. Glass like transparent

View answer

166. Poly-methyl-methacrylate (PMMA) is known as

1. Bakelite
2. Teflon
3. Perspex
4. Nylon-6

View answer

167. Poly-methyl-methacrylate, which is an acrylic resin, is also called

1. Thiokol
2. Plexiglass or Lucite
3. Dacron
4. Teflon

View answer

168. Polypropylene compared to polythene is

1. Harder
2. Stronger
3. Lighter
4. All (A), (B) and (C)

View answer

169. Polypropylene is preferred to polythene, because the former is

1. Non-inflammable
2. Harder
3. Stronger
4. Both (B) & (C)

View answer

170. Polystyrene is a _________ plastic at room temperature.

1. Ductile
2. Brittle
3. Malleable
4. None of these

View answer