⚗️ Chemical Engineering Solved MCQs with Answers

Practice 1920 approved ⚗️ Chemical Engineering questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

1920 solved MCQs

Identify the group in which all the polymers mentioned can be used to make fibres.Answer: Cellulose derivatives, Polyisoprene, Polyethylene Molecular weights of plastics ranges fromAnswer: 20000 to 25000 Non sulphonated hard bakelites are not used for makingAnswer: Ion-exchange resins Which of the following is not present in bagasse fibre ?Answer: None of these Epoxy resin isAnswer: A good abrasive. Polymerisation process in which two or more monomers of chemically different nature take part is calledAnswer: Copolymerisation Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?Answer: 50000 Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.Answer: Polycarbonate Which of the following types of polymers has the strongest inter particle forces ?Answer: Thermosetting polymers A copolymer of vinyl and vinylidine chloride is calledAnswer: Saran The major component of acrylic fibres isAnswer: Polyacrylonitrile Which of the following polymers is used for making a non stick coating on frying pans ?Answer: Teflon Which of the following polymers does not belong to the class of polyacrylate polymer ?Answer: None of these Tyres are made byAnswer: Rotational moulding Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing itsAnswer: Flexibility Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by addingAnswer: Camphor Phthalic anhydride is usedAnswer: As plasticisers Polythene is a/anAnswer: Addition polymerisation product. Synthetic polymer produced by using terephthalic acid and ethylene glycol isAnswer: Terylene Catalyst used in the production of high density polythene by low pressure Ziegler process isAnswer: Aluminium triethyl activated with TiCl₄ Thermosetting polymers as compared to thermoplastic polymersAnswer: Have three dimensional structure. Thermosetting polymers as compared to thermoplastic polymersAnswer: Have three dimensional structure. The monomer of natural rubber isAnswer: Both (b) and (c) 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.Answer: PVC Polycondensation of saturated dicarboxylic acid with polyhydric alcohol producesAnswer: Alkyd resin Dacron is a/anAnswer: Both (b) and (c) __________ polymer is used for making unbreakable crockery.Answer: Melamine Flexible plastic pipes are made ofAnswer: Low density polyethylene (LDPE). Main constituent of natural rubber isAnswer: Polyisoprene In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in theAnswer: Hexamethylene diamine and the adipic acid.