1. Rubber

2. Natural Rubber is.......type of polymer. Polyamide Polyester Polyene Polyether

3. Nature rubber is obtained form the tree named Hevea brazilensis Hevea crailensis Heated brazilensis None of these

4. Rubber is kept in smokehouse for 3days at50°C to Increases tensile strength Increases impact strength Increases resilience Increases resistance to attack by micro organism

5. ASynthetic rubberPCis-1,4polyisoprene BNatural rubberQTrans-1,4polyisoprene CGutta-perchaRSulphur crosslinked rubber dVulcanized rubbersStyrene –butadiene rubber aa)-r, b)-p,c)-q,d)-s ba)-s, b)-p, c)-r,d)-q ca)-s, b)-p, c)-q,d)-r da)-p,b)-s, c)-q,d)-r

6. For application like making of tyres,conveyer belts,insulation---- is used Natural rubber Vulcanised rubber Styrene butadiene rubber None of these

7. SBR is an example of Copolymer Condensation polymer Thermosetting polymer Branched polymer

8. Styrene butadiene rubberis prepared by co-polymerisation of 90%butadiene+10%styrene by weight 75%butadiene+25%styrene by weight 25%butadiene+7510%styrene by weight 10%butadiene+90%styrene by weight

9. Styrene and butadiene monomerson polymerization form Homopolymer Copolymer Croslinked polymer Inorganic polymer

10. Mastication of rubber polymer chains is carried out on Rollers that are hollow to circulate polymer chains Rollers that are hollow to circulate hot and cold water Rollers that are hollow to circulate heat generated Rollers that are rigid heavy to apply pressure