23452. Polymerisation process in which two or more monomers of chemically different nature take part is called
23453. 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 ?
23454. Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.
23455. Which of the following types of polymers has the strongest inter particle forces ?
23456. A copolymer of vinyl and vinylidine chloride is called
23457. The major component of acrylic fibres is
23458. Which of the following polymers is used for making a non stick coating on frying pans ?
23459. Which of the following polymers does not belong to the class of polyacrylate polymer ?
23460. Tyres are made by
23461. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
23462. One Farad is equal to
23463. The depolarizer is used in dry cell is
23464. Polythene is a/an
23465. Synthetic polymer produced by using terephthalic acid and ethylene glycol is
23466. Catalyst used in the production of high density polythene by low pressure Ziegler process is
23467. Thermosetting polymers as compared to thermoplastic polymers
23468. The monomer of natural rubber is
23469. 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.
23470. Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
23471. Two batteries each of open circuit voltage 2 v and internal resistance of 2 Ohm ,the current supplied by the battery is
23472. __________ polymer is used for making unbreakable crockery.
23473. Flexible plastic pipes are made of
23474. Main constituent of natural rubber is
23475. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
23476. The density of the acid in lead acid battery gives of an indication of
23477. The minimum insulation resistance of a water heater is
23478. A solenoid is defined as an electromagnet
23479. __________ is produced by polymerisation of chloroprene.
23480. Two Watt meter method is used to measure the power in -------load
23481. Pick out the wrong statement regarding the solubility characteristics of high polymers.
23482. Ebonite is a/an
23483. Elastomers are
23484. Which of the following additives are added to plastics to make it impervious to X-rays ?
23485. Paper like thin plastic articles can be produced by
23486. 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.
23487. Benzoyl chloride is not used as a catalyst in the manufacture of
23488. Epoxy resin is a polymer containing two or more groups called epoxide group or ethoxyline group. It is a
23489. The conversion of caprolactum in the above case is about __________ percent.
23490. Polycaprolactum is also known as
23491. __________ scrap can be recycled & reutilised.
23492. All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it can not be used for the production of plastic
23493. Polymerisation product of C2F4 (carbon tetraflouride) is called P.T.F.E. (poly chloro tetra flouro ethylene). It is also called
23494. Bakelite is a/an
23495. Polyvinyl alcohol is used as a
23496. Epoxy resins (i.e., epoxide polymers)
23497. Which of the following is the lowest cost plastic commercially available ?
23498. Potential transformer and current transformer are