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Polymer technology
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ Silicone resins, which are highly water repellant and has good heat resistance can not be used as room temperature adhesive. [other wrong options] [Discuss in forum] as grease & lubricant. hydraulic fluid for heat transfer. resin for lamination. |
Q42 ⇒ Size range of polymer molecules varies from __________ metre. 10-2 to 10-5 [other wrong options] [Discuss in forum] 10-4 to 10-7 10-1 to 10-2 10-8 to 10-10 |
Q43 ⇒ Which of the following is not present in bagasse fibre ? None of these [other wrong options] [Discuss in forum] Cellulose Lignin Pentogens |
Q44 ⇒ Which of the following polymers does not belong to the class of polyacrylate polymer ? None of these [other wrong options] [Discuss in forum] PMMA Polyacrylonitrile Polyethyl acrylate |
Q45 ⇒ The monomer of natural rubber is both (b) and (c) [other wrong options] [Discuss in forum] DMT isoprene 2 methyl-1-propene |
Q46 ⇒ Vulcanisation of rubber converts its plasticity into elasticity. [other wrong options] [Discuss in forum] decreases its tensile strength. increases its ozone & oxygen reactivity. increases its oil & solvent resistance. |
Q47 ⇒ Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals. organic peroxides [other wrong options] [Discuss in forum] sulphuric acid hydroflouric acid none of these |
Q48 ⇒ Which of the following is the lowest cost plastic commercially available ? Polythene [other wrong options] [Discuss in forum] Teflon Bakelite PVC |
Q49 ⇒ Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. polyacrylonitrile [other wrong options] [Discuss in forum] nylon polypropylene polyester |
Q50 ⇒ 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 polyamide [other wrong options] [Discuss in forum] polyester polyisoprene polystyrene |
Q51 ⇒ __________ is a copolymer. styrene butadiene rubber (SBR) [other wrong options] [Discuss in forum] Neoprene PVC None of these |
Q52 ⇒ Phenol formaldehyde employs condensation polymerisation. [other wrong options] [Discuss in forum] employs addition polymerisation. is a monomer. is an abrasive material. |
Q53 ⇒ Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their magnitude of intermolecular forces. [other wrong options] [Discuss in forum] molecular sizes. resistance to heat. polymerisation mechanism. |
Q54 ⇒ Vulcanisation of raw rubber makes it less elastic [other wrong options] [Discuss in forum] soft plastic tacky |
Q55 ⇒ Plastic articles are normally produced by __________ moulding. injection [other wrong options] [Discuss in forum] green sand shell dry sand |
Q56 ⇒ Polystyrene is a __________ plastic at room temperature. brittle [other wrong options] [Discuss in forum] ductile malleable none of these |
Q57 ⇒ Low pressure Zeigler process of polythene manufacture achieves an yield of 95-98% based on ethylene. [other wrong options] [Discuss in forum] employs a pressure of 30 kgf/cm2. produces very low density polythene. does not use any catalyst for polymerisation. |
Q58 ⇒ Cellulose is the main contituent of most __________ fibres. natural [other wrong options] [Discuss in forum] acrylic spandex synthetic |
Q59 ⇒ Buna-S is a __________ material. rubbery [other wrong options] [Discuss in forum] fibrous plastic resinous |
Q60 ⇒ Mastication of rubber means its softening. [other wrong options] [Discuss in forum] a treatment to retard its deterioration due to oxidation. improving its curing rate. depression of its freezing point. |
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