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.
| 51. |
Rayon is a __________ fibre. |
| A. | cellulosic |
| B. | polyamide |
| C. | polyester |
| D. | natural |
| Answer» B. polyamide | |
| 52. |
Cross linked polymers are |
| A. | thermoplastic |
| B. | thermosetting |
| C. | either (a) or (b) |
| D. | fibres only |
| Answer» C. either (a) or (b) | |
| 53. |
Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is |
| A. | chloroethane |
| B. | chlorophrene |
| C. | isoprene |
| D. | none of these |
| Answer» C. isoprene | |
| 54. |
Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C. |
| A. | -20 |
| B. | 50 |
| C. | 250 |
| D. | 500 |
| Answer» C. 250 | |
| 55. |
A copolymer is formed by the combination of two or more monomer molecules |
| A. | in a chain without the elimination of water. |
| B. | with the elimination of small amount of water. |
| C. | of the same monomer by elimination of small molecules of water. |
| D. | none of these. |
| Answer» B. with the elimination of small amount of water. | |
| 56. |
Properties of a polymer is affected by the |
| A. | chain length. |
| B. | intermolecular forces. |
| C. | branching & cross-linking. |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 57. |
Gutta parcha rubber is |
| A. | soft & tacky at room temperature. |
| B. | an isomer of natural rubber. |
| C. | a thermosetting resin. |
| D. | recovered by coagulation of rubber latex. |
| Answer» C. a thermosetting resin. | |
| 58. |
Identify the group in which all the polymers mentioned can be used to make fibres. |
| A. | Butadiene copolymers, Polyamides, Urea aldehyde |
| B. | Cellulose derivatives, Polyisoprene, Polyethylene |
| C. | Cellulose derivatives, Polyamides, Polyurathane |
| D. | Polypropylene, Poly vinyl chloride, Silicon |
| Answer» C. Cellulose derivatives, Polyamides, Polyurathane | |
| 59. |
Which of the following polymers belong to the class of formaldehyde resin ? |
| A. | Melamine resins |
| B. | Teflon |
| C. | Dacron |
| D. | None of these |
| Answer» B. Teflon | |
| 60. |
Polystyrene is a __________ plastic at room temperature. |
| A. | ductile |
| B. | brittle |
| C. | malleable |
| D. | none of these |
| Answer» C. malleable | |
| 61. |
Collapsible tubes for tooth paste are produced by __________ extrusion. |
| A. | direct |
| B. | indirect |
| C. | impact |
| D. | none of these |
| Answer» D. none of these | |
| 62. |
Nylon 6 as compared to nylon 6, 6 has lower |
| A. | abrasion resistance. |
| B. | thermal stability. |
| C. | adhesion to rubber. |
| D. | hardness. |
| Answer» B. thermal stability. | |
| 63. |
Orlon is |
| A. | a copolymer. |
| B. | a condensation polymer. |
| C. | obtained by polymerising vinyl cyanide. |
| D. | all (a), (b) and (c). |
| Answer» D. all (a), (b) and (c). | |
| 64. |
Silliminite (Al₂O₃.SiO₂) refractory, which is a neutral refractory, is not used in |
| A. | pottery furnace |
| B. | glass melting furnace |
| C. | crucibles |
| D. | gas retorts |
| Answer» E. | |
| 65. |
Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is |
| A. | 7 kgf/cm² and 70 °C. |
| B. | 1000 kgf/cm² and 100°C. |
| C. | 7 kgf/cm² and 700°C. |
| D. | 1 kgf/cm² (gage) and 70°C. |
| Answer» B. 1000 kgf/cm² and 100°C. | |
| 66. |
Adipic acid is an intermediate in the manufacture of |
| A. | perspex |
| B. | nylon-66 |
| C. | polystyrene |
| D. | bakelite |
| Answer» C. polystyrene | |
| 67. |
Elastomers are |
| A. | thermosetting material. |
| B. | exemplified by protein derivatives. |
| C. | having high flexural strength. |
| D. | having very high tensile strength and heat resistance. |
| Answer» D. having very high tensile strength and heat resistance. | |
| 68. |
Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ? |
| A. | Phosphorous |
| B. | Carbon black |
| C. | Pine oil |
| D. | Rosin |
| Answer» C. Pine oil | |
| 69. |
Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an |
| A. | rigid foam |
| B. | engineering plastic |
| C. | thermosetting polymer |
| D. | spongy rubber |
| Answer» C. thermosetting polymer | |
| 70. |
Styrene butadiene rubber (SBR) is never used for making |
| A. | coated fabrics |
| B. | front wheel tyres of aeroplanes (i.e., heavy duty tyres) |
| C. | gaskets |
| D. | soles of shoes |
| Answer» C. gaskets | |
| 71. |
Automobile steering wheels are normally made of |
| A. | cellulose acetate |
| B. | cellulose nitrate |
| C. | PVC |
| D. | high density polythene |
| Answer» B. cellulose nitrate | |
| 72. |
Polymerisation process in which two or more monomers of chemically different nature take part is called |
| A. | copolymerisation |
| B. | addition polymerisation |
| C. | chain polymerisation |
| D. | none of these |
| Answer» B. addition polymerisation | |
| 73. |
Thermosetting materials |
| A. | are cross-linked molecules. |
| B. | soften on application of heat. |
| C. | are solvent soluble. |
| D. | none of these. |
| Answer» B. soften on application of heat. | |
| 74. |
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 ? |
| A. | 50000 |
| B. | 51600 |
| C. | 49200 |
| D. | 50800 |
| Answer» B. 51600 | |
| 75. |
Neoprene is a |
| A. | monomer |
| B. | synthetic rubber |
| C. | polyester |
| D. | none of these |
| Answer» C. polyester | |
| 76. |
__________ polymer is used for making unbreakable crockery. |
| A. | Thermoplastic |
| B. | Melamine |
| C. | Addition |
| D. | none of these |
| Answer» C. Addition | |
| 77. |
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ? |
| A. | Ammonium alum |
| B. | Potassium alum |
| C. | both a & b |
| D. | neither a nor b |
| Answer» D. neither a nor b | |
| 78. |
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their |
| A. | molecular sizes. |
| B. | magnitude of intermolecular forces. |
| C. | resistance to heat. |
| D. | polymerisation mechanism. |
| Answer» C. resistance to heat. | |
| 79. |
In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ? |
| A. | PTFE |
| B. | Buna-S |
| C. | PMMA |
| D. | Polycaprolactum |
| Answer» C. PMMA | |
| 80. |
Cellulose is the main contituent of most __________ fibres. |
| A. | acrylic |
| B. | spandex |
| C. | synthetic |
| D. | natural |
| Answer» E. | |
| 81. |
Which of the following is not the commercial name of polymethylmethacrylate (PMMA) ? |
| A. | Perspex |
| B. | Lucite |
| C. | Plexiglass |
| D. | Teflon |
| Answer» E. | |
| 82. |
Which of the following is the lowest cost plastic commercially available ? |
| A. | Polythene |
| B. | Teflon |
| C. | Bakelite |
| D. | PVC |
| Answer» B. Teflon | |
| 83. |
Terylene is a/an |
| A. | addition polymer |
| B. | poly amide |
| C. | homopolymer |
| D. | none of these |
| Answer» E. | |
| 84. |
Low density polythene as compared to high density polythene is |
| A. | harder |
| B. | tougher |
| C. | chemically inert |
| D. | more flexible |
| Answer» E. | |
| 85. |
Thermosplastic materials |
| A. | do not soften on application of heat. |
| B. | are heavily branched molecules. |
| C. | are solvent insoluble. |
| D. | none of these. |
| Answer» E. | |
| 86. |
Which of the following is not a thermoplastic material ? |
| A. | Epoxy polymer |
| B. | PVC |
| C. | Polystyrene |
| D. | Polythene |
| Answer» B. PVC | |
| 87. |
The major component of acrylic fibres is |
| A. | polyamides |
| B. | polyolefins |
| C. | polyacrylonitrile |
| D. | polyesters |
| Answer» D. polyesters | |
| 88. |
Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used |
| A. | for surface coating of automobiles & air crafts. |
| B. | for fibre making. |
| C. | as plasticiser for PVC & nitrocellulose. |
| D. | for film forming materials. |
| Answer» C. as plasticiser for PVC & nitrocellulose. | |
| 89. |
Softening point of high density polythene is about __________ °C. |
| A. | 85 |
| B. | 135 |
| C. | 165 |
| D. | 205 |
| Answer» C. 165 | |
| 90. |
Which of the following has the weakest intermolecular forces ? |
| A. | Polyisoprene |
| B. | Nylon-66 |
| C. | Polystyrene |
| D. | Bakelite |
| Answer» B. Nylon-66 | |
| 91. |
All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it can not be used for the production of plastic |
| A. | filaments |
| B. | pipes |
| C. | buckets |
| D. | tubings |
| Answer» D. tubings | |
| 92. |
Polymethyl methacrylate (PMMA) which is also known as perspex and is produced by bulk polymerisation of methyl methacrylate is not a __________ polymer. |
| A. | thermoplastic |
| B. | thermosetting |
| C. | linear |
| D. | glass like transparent |
| Answer» C. linear | |
| 93. |
Synthetic polymer produced by using terephthalic acid and ethylene glycol is |
| A. | terylene |
| B. | nylon-66 |
| C. | PVC |
| D. | polyesterene |
| Answer» B. nylon-66 | |
| 94. |
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher |
| A. | densities |
| B. | melting point |
| C. | tensile strength |
| D. | hardness, rigidity & brittleness |
| Answer» E. | |
| 95. |
Paper like thin plastic articles can be produced by |
| A. | blow moulding |
| B. | vacuum thermo forming |
| C. | injection moulding |
| D. | none of these |
| Answer» C. injection moulding | |
| 96. |
Epoxy resin is |
| A. | not used for surface coating. |
| B. | a good abrasive. |
| C. | an elastomer. |
| D. | a polyester. |
| Answer» C. an elastomer. | |
| 97. |
__________ is not a polyester fibre. |
| A. | Terylene |
| B. | Dacron |
| C. | Nylon |
| D. | Polyacrylonitrite |
| Answer» D. Polyacrylonitrite | |
| 98. |
The monomer for the production of neoprene rubber is |
| A. | acetylene |
| B. | chloroprene |
| C. | isoprene |
| D. | none of these |
| Answer» C. isoprene | |
| 99. |
Thermosetting plastic materials |
| A. | can be repeatedly melted. |
| B. | is useful for melt casting. |
| C. | can not be melted after forming. |
| D. | is useful for spinning. |
| Answer» D. is useful for spinning. | |
| 100. |
Polyvinyl chloride (PVC) is |
| A. | a thermosetting material. |
| B. | a condensation polymerisation product. |
| C. | made by employing emulsion polymerisation. |
| D. | none of these. |
| Answer» D. none of these. | |