21. Which of the following are thermoplastic polymers?
A
Polythene, urea-formaldehyde, polyvinyls
B
Bakelite, polythene, polystyrene
C
Polythene, polystyrene, polyvinyls
D
Urea-formaldehyde, polystyrene, bakelite
Answer :
Polythene, polystyrene, polyvinyls
22. Structure of some important polymers are given. Which one represents Buna- $$S?$$
A
B
C
D
Answer :
23. Which one of the following monomers gives the polymer neoprene on polymerisation?
A
B
C
D
Answer :
24. Terylene is a condensation polymer of ethylene glycol and
A
benzoic acid
B
phthalic acid
C
salicylic acid
D
terephthalic acid
Answer :
terephthalic acid
25. Which of the following is a linear polymer?
A
Bakelite
B
Glycogen
C
PVC
D
LDP
Answer :
PVC
26. Which of the following is not prepared by addition polymerisation?
A
Polythene
B
Polystyrene
C
Neoprene
D
Nylon 6, 6
Answer :
Nylon 6, 6
27. Of the following which one is classified as polyester polymer?
A
Bakelite
B
Melamine
C
Nylon-66
D
Terylene
Answer :
Terylene
28. Which of the following biodegradable polymer is used for sutures for post operative stitches?
A
$$PHBV$$
B
Nylon-2-nylon-6
C
Aliphatic polyesture
D
All of these
Answer :
Nylon-2-nylon-6
29. In elastomer, the intermolecular forces are
A
strong
B
weak
C
nil
D
None of the above
Answer :
weak
30. Caprolactum is used for the manufacture of
A
nylon-6
B
teflon
C
terylene
D
nylon-6 6
Answer :
nylon-6
