Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent. 1000-1500 1-1000 1500-2000 2000-2500 TRUE ANSWER : ? YOUR ANSWER : ?
Contact lenses for eyes are made of perspex, which is nothing but Polypropylene Unsaturated polyester Polymethylmethacrylate Polystyrene TRUE ANSWER : ? YOUR ANSWER : ?
Dacron is a/an Unsaturated polyester Polyamide Polyester Inorganic polymer TRUE ANSWER : ? YOUR ANSWER : ?
Branched chain polymers compared to linear polymers have higher Degree of irregularity in atomic packing Density Tensile strength Melting point TRUE ANSWER : ? YOUR ANSWER : ?
Polyvinyl acetate is never used for making Fibres Moulded articles Adhesives All of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a polyolefin? Polypropylene Polystyrene None of these Neoprene TRUE ANSWER : ? YOUR ANSWER : ?
Amino resins are used in paper treatment to improve its Wet tear and bursting strength Wet rub resistance All of these Folding endurance TRUE ANSWER : ? YOUR ANSWER : ?
Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent. 50 99 90 75 TRUE ANSWER : ? YOUR ANSWER : ?
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. Hydroflouric acid None of these Sulphuric acid Organic peroxides TRUE ANSWER : ? YOUR ANSWER : ?
Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces Dacron Nylon-6 PVC Polyester TRUE ANSWER : ? YOUR ANSWER : ?