All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 87 of 350
- A. Bakelite
- B. Melamine polymer
- C. Poly-methyl-methacrylate (PMMA)
- D. None of these
Explanation: Bakelite and melamine-formaldehyde are condensation polymers because their formation eliminates small molecules.
Correct answer: Poly-methyl-methacrylate (PMMA)- A. Nylon
- B. Polyester
- C. Polypropylene
- D. Polyacrylonitrile
Explanation: Polyacrylonitrile is comparatively amorphous among the listed fibre-forming polymers, whereas nylon, polypropylene and polyester generally…
Correct answer: Polyacrylonitrile- A. Catalytic dehydrogenation of ethyl benzene
- B. Dehydration of ethyl alcohol followed by hydrogenation
- C. Reacting ethylene oxide with acetaldehyde
- D. Fermentation of starch
Explanation: Industrial styrene is produced mainly by catalytic dehydrogenation of ethylbenzene: C6H5CH2CH3 yields C6H5CH=CH2 plus hydrogen.
Correct answer: Catalytic dehydrogenation of ethyl benzene- A. Low density
- B. High density
- C. Cross-linked
- D. Linear low density
Explanation: High-density polythene is more prone to environmental stress cracking because its greater crystallinity and stiffness allow cracks to…
Correct answer: High density- A. Micro-molecules
- B. None of these
- C. Sub-micromolecules
- D. Macromolecules
Explanation: Polymers consist of very long chains made from many repeating units, giving them extremely high molecular masses.
Correct answer: Macromolecules- A. Are cross-linked molecules
- B. Soften on application of heat
- C. Are solvent soluble
- D. None of these
Explanation: Thermosetting polymers develop a permanent three-dimensional cross-linked network during curing.
Correct answer: Are cross-linked molecules- A. Polyisoprene
- B. None of these
- C. Nitrile-butadiene
- D. Neoprene
Explanation: Polyisoprene, neoprene and nitrile-butadiene rubber are all elastomers because they can undergo large reversible stretching.
Correct answer: None of these- A. 85
- B. 135
- C. 165
- D. 205
Explanation: High-density polythene softens at approximately 135°C, reflecting its relatively high crystallinity and melting range.
Correct answer: 135- A. Emulsion polymerisation
- B. Suspension polymerisation
- C. Solution polymerisation
- D. Bulk polymerisation
Explanation: SBR is commonly produced by free-radical emulsion polymerisation of styrene and butadiene in an aqueous medium.
Correct answer: Emulsion polymerisation- A. Perspex
- B. Nylon-66
- C. Polystyrene
- D. Bakelite
Explanation: Nylon-66 is made from hexamethylene diamine and adipic acid, and adipic acid is therefore one of its key intermediates.
Correct answer: Nylon-66- A. Thermosetting resin
- B. Polyamide
- C. Polyester
- D. None of these
Explanation: Nylon-6 contains repeating amide linkages, formed by polymerisation of caprolactam or 6-aminohexanoic acid.
Correct answer: Polyamide- A. Polycarbonates
- B. Polytetrafluroethylene (PTFE)
- C. Polymethyl methacrylate (PMMA)
- D. Phenolic resins
Explanation: Plexiglass or Lucite is polymethyl methacrylate, whose clear amorphous structure gives high optical transparency.
Correct answer: Polymethyl methacrylate (PMMA)- A. Teflon
- B. Bakelite
- C. SBR
- D. PVC
Explanation: Rexine is artificial leather made by coating fabric with polyvinyl chloride, often followed by embossing to imitate leather.
Correct answer: PVC- A. Hexamethylene diamine and adipic acid
- B. Adipic acid and methyl amine
- C. Vinyl chloride and formaldehyde
- D. None of these
Explanation: Nylon-66 is a condensation polyamide formed from a six-carbon diamine, hexamethylene diamine, and a six-carbon diacid, adipic acid.
Correct answer: Hexamethylene diamine and adipic acid1735. The only natural thermoplastic resin, which is a product of animal life is ____________________?
- A. Rosin
- B. Shellac
- C. Amber
- D. Copal
Explanation: Shellac is a natural thermoplastic resin secreted by the lac insect, so it is a product of animal life.
Correct answer: Shellac- A. Nylon-66
- B. Polyester
- C. Teflon
- D. Bakelite
Explanation: Teflon is formed by chain-growth addition polymerisation of tetrafluoroethylene through successive radical additions.
Correct answer: Teflon- A. An isomer of natural rubber
- B. Soft & tacky at room temperature
- C. A thermosetting resin
- D. Recovered by coagulation of rubber latex
Explanation: Gutta percha is the trans isomer of natural rubber, whereas ordinary natural rubber is mainly the cis form.
Correct answer: An isomer of natural rubber- A. Polyamide
- B. Unsaturated polyesters
- C. Saturated polyesters
- D. Polyacrylonitrile
Explanation: Unsaturated polyesters generally form cross-linked thermosetting networks, so they cannot be readily softened and drawn into fibres.
Correct answer: Unsaturated polyesters- A. 10
- B. 20
- C. 50
- D. 85
Explanation: Bamboo fibre typically contains about 40 to 60% cellulose, making 50% the closest listed value.
Correct answer: 50- A. Terylene
- B. Polybutadiene
- C. PVC
- D. Polypropylene
Explanation: Terylene is a polyester formed by step-growth condensation of ethylene glycol and terephthalic acid or a related ester, with elimination…
Correct answer: Terylene