4601. Gutta parcha rubber is
soft & tacky at room temperature.
an isomer of natural rubber.
a thermosetting resin.
recovered by coagulation of rubber latex.
✅ The correct answer is option B.
Chemical Engineering
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4602. The only natural thermoplastic resin, which is a product of animal life is
rosin
shellac
amber
copal
✅ The correct answer is option B.
4604. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
glycerol
nitro cellulose
camphor
none of these
✅ The correct answer is option C.
4605. Non sulphonated hard bakelites are not used for making
ion-exchange resins
fountain pen barrels
formica table tops
combs
✅ The correct answer is option A.
4606. Elastomers are
thermosetting material.
exemplified by protein derivatives.
having high flexural strength.
having very high tensile strength and heat resistance.
✅ The correct answer is option C.
4607. Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.
-20
50
250
500
✅ The correct answer is option B.
4608. Polycondensation reaction of polymerisation
does not produce linear polymers.
produces only thermoplastic material.
produces epoxy polymers.
does not need any catalyst.
✅ The correct answer is option C.
4609. Polymethyl methacrylate, which is an acrylic resin, is also called
thiokol
plexiglass or lucite
dacron
teflon
✅ The correct answer is option B.
4610. Which of the following is not a polymer of two monomers ?
Teflon
Bakelite
SBR
None of these
✅ The correct answer is option A.