MCQOPTIONS
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MCQOPTIONS
This section includes 568 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of |
| A. | cross linked polystyrene. |
| B. | phenol formaldehyde resins. |
| C. | polyesters. |
| D. | polyamides. |
| Answer» B. phenol formaldehyde resins. | |
| 152. |
Which of the following is generally not drawn into fibre ? |
| A. | Polyamide |
| B. | Unsaturated polyesters |
| C. | Saturated polyesters |
| D. | Polyacrylonitrile |
| Answer» C. Saturated polyesters | |
| 153. |
Which of the following is generally not used as eord for synthetic rubber tyre casing ? |
| A. | Dacron |
| B. | Nylon |
| C. | Cellulose |
| D. | None of these |
| Answer» D. None of these | |
| 154. |
Polycaprolactum is nothing but |
| A. | orlon |
| B. | nylon 6, 6 |
| C. | nylon 6 |
| D. | saran |
| Answer» D. saran | |
| 155. |
Main constituent of natural rubber is |
| A. | polystyrene |
| B. | polyisoprene |
| C. | polybutadiene |
| D. | poly chloroprene |
| Answer» C. polybutadiene | |
| 156. |
Plastic tubes & pipes are generally made by __________ moulding. |
| A. | injection |
| B. | transfer |
| C. | extrusion |
| D. | compression |
| Answer» D. compression | |
| 157. |
Condensation polymerisation of caprolac-tum 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 |
| Answer» E. | |
| 158. |
Diphenylamine is added to rubber to |
| A. | valcanise it. |
| B. | protect it from deterioration on exposure to air. |
| C. | make it non-inflammable. |
| D. | make it thermosetting. |
| Answer» C. make it non-inflammable. | |
| 159. |
Size range of polymer molecules varies from __________ metre. |
| A. | 10⁻² to 10⁻⁵ |
| B. | 10⁻⁴ to 10⁻⁷ |
| C. | 10⁻¹ to 10⁻² |
| D. | 10⁻⁸ to 10⁻¹⁰ |
| Answer» B. 10⁻⁴ to 10⁻⁷ | |
| 160. |
Nylon 6, 10 which is used for bristles making is superior to nylon 6, 6 due to its lower water absorption capacity, is a/an |
| A. | polyester |
| B. | polyamide |
| C. | polyisoprene |
| D. | polystyrene |
| Answer» C. polyisoprene | |
| 161. |
Perspex can be used as a substitute of glass. Its monomer is |
| A. | methyl methacrylate |
| B. | DMT |
| C. | butadiene |
| D. | tetrafluroethylene |
| Answer» B. DMT | |
| 162. |
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 |
| Answer» D. generally only one monomer is involved | |
| 163. |
__________ is normally used for the manufacture of refrigerator components and transistor parts. |
| A. | Polyproylene |
| B. | Polystyrene |
| C. | Polyester |
| D. | Polyurathene |
| Answer» C. Polyester | |
| 164. |
Main constituent of cotton fibre is |
| A. | lignin |
| B. | cellulose |
| C. | starch |
| D. | gelatine |
| Answer» C. starch | |
| 165. |
Vulcanisation of rubber |
| A. | decreases its tensile strength. |
| B. | increases its ozone & oxygen reactivity. |
| C. | increases its oil & solvent resistance. |
| D. | converts its plasticity into elasticity. |
| Answer» E. | |
| 166. |
Poly tetra flouro ethylene (PTFE) is known as |
| A. | dacron |
| B. | teflon |
| C. | bakelite |
| D. | celluloid |
| Answer» C. bakelite | |
| 167. |
Alkyd resin can not be used for making |
| A. | plasticiser |
| B. | paint & varnish |
| C. | fibres |
| D. | film forming materials |
| Answer» D. film forming materials | |
| 168. |
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres. |
| A. | polythene |
| B. | PVC |
| C. | rayon |
| D. | polyvinyl acetate |
| Answer» C. rayon | |
| 169. |
__________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol). |
| A. | Unsaturated polyester |
| B. | Alkyd resins |
| C. | Saturated polyester |
| D. | Amino resins |
| Answer» C. Saturated polyester | |
| 170. |
__________ practically possess no elasticity. |
| A. | Vulcanite or ebonite |
| B. | Spandex fibre |
| C. | Polysulphide rubber |
| D. | Epoxy resin |
| Answer» B. Spandex fibre | |
| 171. |
Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its |
| A. | elasticity |
| B. | strength |
| C. | plasticity |
| D. | weathering characteristics |
| Answer» E. | |
| 172. |
The monomer of poly vinyl chloride (PVC) is |
| A. | chloroethene |
| B. | ethylene dichloride |
| C. | ethyl chloride |
| D. | chloroform |
| Answer» B. ethylene dichloride | |
| 173. |
Rain coats are made of |
| A. | neoprene |
| B. | PVC |
| C. | polyurathane |
| D. | SBR |
| Answer» C. polyurathane | |
| 174. |
Styrene butadiene rubber (SBR) is |
| A. | a natural rubber. |
| B. | another name of silicone rubber. |
| C. | a synthetic polymer. |
| D. | a synthetic monomer. |
| Answer» D. a synthetic monomer. | |
| 175. |
Density of low density polythene is about __________ gm/c.c. |
| A. | 0.38 |
| B. | 0.56 |
| C. | 0.81 |
| D. | 0.91 |
| Answer» E. | |
| 176. |
Addition polymerisation is not involved in the manufacture of |
| A. | low density polythene. |
| B. | poly vinyl chloride. |
| C. | polystyrene. |
| D. | polyhexamethylene adipamide. |
| Answer» E. | |
| 177. |
Celluloid is |
| A. | cellulose acetate |
| B. | regenerated cellulose |
| C. | cellulose nitrate |
| D. | cellulose acetate butyrate |
| Answer» D. cellulose acetate butyrate | |
| 178. |
Viscosity of a polymer solution or melt |
| A. | decreases with increase in molecular weight. |
| B. | decreases with increase in temperature. |
| C. | increases with increase in temperature. |
| D. | does not vary with temperature rise. |
| Answer» D. does not vary with temperature rise. | |
| 179. |
__________ is an addition polymer |
| A. | Nylon |
| B. | Bakelite |
| C. | Polythene |
| D. | none of these |
| Answer» D. none of these | |
| 180. |
Starting material for the production of butadiene in India is |
| A. | naphthalene |
| B. | benzol |
| C. | ethyl alcohol |
| D. | phthalic anhydride |
| Answer» D. phthalic anhydride | |
| 181. |
__________ is a copolymer. |
| A. | styrene butadiene rubber (SBR) |
| B. | Neoprene |
| C. | PVC |
| D. | None of these |
| Answer» B. Neoprene | |
| 182. |
Linear polymers are normally |
| A. | thermosetting. |
| B. | thermosplastic. |
| C. | elastometric. |
| D. | having extremely high softening point. |
| Answer» C. elastometric. | |
| 183. |
Starting material for the production of SBR is |
| A. | ethyl alcohol |
| B. | ethylene |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 184. |
Polyvinyl alcohol is used as a |
| A. | cation/anion exchanger. |
| B. | water soluble adhesive. |
| C. | textile fibre. |
| D. | non-sticky coating on frying pans. |
| Answer» C. textile fibre. | |
| 185. |
Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent. |
| A. | 50 |
| B. | 75 |
| C. | 90 |
| D. | 99 |
| Answer» D. 99 | |
| 186. |
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 ? |
| A. | Bakelite (phenol formaldehyde) |
| B. | Polyester |
| C. | Polythene |
| D. | Nylon-6 |
| Answer» B. Polyester | |
| 187. |
Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are |
| A. | 50°C and 3 - 4 kg/cm² |
| B. | 50°C and 1 kgf/cm² |
| C. | 250°C and 10 kgf/cm² |
| D. | 250°C and 1 kgf/cm² |
| Answer» B. 50°C and 1 kgf/cm² | |
| 188. |
Which of the following low molecular weight (<10⁴ ), soft & waxy polymer is used in chewing gum ? |
| A. | Cellulose acetate |
| B. | Polyvinyl acetate |
| C. | Thiokol |
| D. | PVC |
| Answer» C. Thiokol | |
| 189. |
Which of the following polymers has the tendency of decomposing before melting ? |
| A. | Polystyrene |
| B. | Nylon |
| C. | PVC |
| D. | None of these |
| Answer» D. None of these | |
| 190. |
The process involved in converting rubber into a thin sheet or coating it on fabric is called |
| A. | extrusion |
| B. | mastication |
| C. | calendering |
| D. | vulcanisation |
| Answer» D. vulcanisation | |
| 191. |
Polyesters are manufactured by the polycondensation reaction of |
| A. | dibasic acid with dihydric alcohol. |
| B. | a single monomer. |
| C. | carboxylic acid with ethylene. |
| D. | inorganic acid with ethylene glycol. |
| Answer» B. a single monomer. | |
| 192. |
Thiokol is nothing but |
| A. | polysulphide rubber |
| B. | polyamide fibre |
| C. | engineering plastic |
| D. | exponded polystyrene |
| Answer» B. polyamide fibre | |
| 193. |
Which of the following is a polymer of hexamethylene diamine and adipic acid ? |
| A. | Nylon-6 |
| B. | Nylon-66 |
| C. | Nylon-6, 10 |
| D. | Epoxy resin |
| Answer» C. Nylon-6, 10 | |
| 194. |
The rate controlling step in the manufacture of silicone rubber is the |
| A. | polymer termination step. |
| B. | condensation of siloxane to silicone. |
| C. | initial hydrolysis of silicone monomer. |
| D. | none of these. |
| Answer» D. none of these. | |
| 195. |
The generic chemical name for the class of polymers which are commerically known as nylons is |
| A. | polyolefins |
| B. | polyamide |
| C. | polyacrylate |
| D. | polyurathane |
| Answer» C. polyacrylate | |
| 196. |
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 |
| Answer» E. | |
| 197. |
Acrylonitrile is mainly used in the __________ industry. |
| A. | polymer |
| B. | printing |
| C. | dyeing |
| D. | photographic |
| Answer» B. printing | |
| 198. |
Synthetic rubber |
| A. | deforms, if stretched to double of its original dimension. |
| B. | is brittle at low temperature |
| C. | is softer at higher temperature. |
| D. | is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases. |
| Answer» E. | |
| 199. |
Styrene which is a monomer for the production of polystyrene, is commercially produced by the |
| A. | catalytic dehydrogenation of ethyl benzene. |
| B. | dehydration of ethyl alcohol followed by hydrogenation. |
| C. | reacting ethylene oxide with acetal-dehyde. |
| D. | fermentation of starch. |
| Answer» B. dehydration of ethyl alcohol followed by hydrogenation. | |
| 200. |
__________ moulding is used for shaping of thermosetting plastics exclusively. |
| A. | Compression |
| B. | Injection |
| C. | Transfer |
| D. | Extrusion |
| Answer» D. Extrusion | |