Chemical Engineering MCQs

6108 MCQs  (Page 286 of 611)

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Polymers are_________________?
A. Micro-molecules
B. Macromolecules
C. Sub-micromolecules
D. None of these
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_____________ polythene is most prone to stress-cracking ?
A. High density
B. Low density
C. Cross-linked
D. Linear low density
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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 acetaldehyde
D. Fermentation of starch
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Most of the fibre forming polymers are crystalline in nature, one of the exceptions being ______________ which is amorphous in nature?
A. Nylon
B. Polyacrylonitrile
C. Polypropylene
D. Polyester
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Which of the following is not a condensation polymer ?
A. Bakelite
B. Melamine polymer
C. Poly-methyl-methacrylate (pmma)
D. None of these
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Phenol formaldehyde __________________?
A. Employs addition polymerisation
B. Employs condensation polymerisation
C. Is a monomer
D. Is an abrasive material
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Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten__________________?
A. Saturated polyester
B. Polyurethane
C. Polystyrene
D. Either b. or c.
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In nylon-6, the number 6 represents the total number of_________________?
A. Carbon atoms in the ring
B. Carbon atoms in the linear polymer chain
C. Nitrogen atoms in the ring
D. Hydrogen atoms in the ring
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The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?
A. Extrusion
B. Mastication
C. Calendaring
D. Vulcanisation
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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
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Word of the Day
28 Jul
Fragile
(of an object) easily broken or damaged.
نازک، کاغذی، آسانی سے ٹوٹ جانیوالا

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