61. Which of the following sets contain only addition homopolymers?
A
Polythene, natural rubber, cellulose
B
Nylon, polyester, melamine resin
C
Teflon, bakelite, orlon
D
Neoprene, $$PVC,$$ polythene
Answer :
Neoprene, $$PVC,$$ polythene
62. The difference in the densities of low density $$(LDP)$$ and high density polymers $$(HDP)$$ is due to the fact that
A
$$LDP$$ are highly branched structures while $$HDP$$ consists of closely packed linear molecules
B
$$LDP$$ are linear chains while $$HDP$$ are branched chains of polythene
C
both $$LDP$$ and $$HDP$$ are unbranched linear chains with different lengths
D
at high temperature, the density of polymer is reduced
Answer :
$$LDP$$ are highly branched structures while $$HDP$$ consists of closely packed linear molecules
63. Which one of the following is not a condensation polymer?
A
Melamine
B
Glyptal
C
Dacron
D
Neoprene
Answer :
Neoprene
64. Bakelite is obtained from phenol by reacting with
A
$${\left( {C{H_2}OH} \right)_2}$$
B
$$C{H_3}CHO$$
C
$$C{H_3}COC{H_3}$$
D
$$HCHO$$
Answer :
$$HCHO$$
65. Which one of the following sets forms the biodegradable polymer ?
A
B
C
D
Answer :
67. Which of the following polymer is a polyamide ?
A
Terylene
B
Nylon
C
Rubber
D
Vulcanised rubber
Answer :
Nylon
68.
Match the polymers given in column I with the monomers in column II and mark the appropriate choice.
A
A - ii, B - i, C - iii, D - iv
B
A - iii, B - iv, C - i, D - ii
C
A - i, B - iii, C - ii, D - iv
D
A - iv, B - ii, C - iii, D - i
Answer :
A - iii, B - iv, C - i, D - ii
69. The polymer used for optical lenses is :
A
polypropylene
B
polyvinyl chloride
C
polythene
D
polymethyl methacrylate
Answer :
polymethyl methacrylate
70. Example of condensation polymer is
A
Formaldehyde → meta-formaldehyde
B
Acetaldehyde → para-aldehyde
C
Acetone → mesityl oxide
D
Ethene → polyethene
Answer :
Acetone → mesityl oxide
