21. Thermosetting plastic materials
22. Which of the following polymers shows the highest anti-tacking properties?
23. Bakelite (phenol-formaldehyde) resin can not be used as
24. Flexible plastic pipes are made of
25. Synthetic polymer produced by using terephthalic acid and ethylene glycol is
26. The organic acid monomer in nylon 66 is
27. Paper like thin plastic articles can be produced by
28. Pick out the correct statement.
29. Which of the following is not a natural polymer?
30. Which of the following is stretched into fibres?
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