111. What is the percentage of sulphur used in vulcanization of rubber ?
A
05% to 30%
B
03% to 25%
C
10% to 20%
D
05% to 20%
Answer :
05% to 30%
112. Choose the correct statements from the following.
A
Nylon 2-nylon 6 is a polyamide copolymer of alanine.
B
3-Hydroxy pentanoic acid is a monomer of Nylon 2-nylon 6.
C
$$PHBV$$ can never be used in the manufacture of orthopaedic devices.
D
None of these.
Answer :
None of these.
is 
114. Dacron is an example of
A
polyamides
B
polypropenes
C
polyacrylonitrile
D
polyesters
Answer :
polyesters
115. Which of the following statements is not true about low density polythene?
A
Tough
B
Hard
C
Poor conductor of electricity
D
Highly branched structure
Answer :
Hard
116.
is a
A
copolymer
B
addition polymer
C
thermo-setting polymer
D
homopolymer
Answer :
copolymer
is a copolymer. Polymers whose repeating structural units are derived form two or more types of monomer units are called copolymer $$n\,{H_2}\,N{\left( {C{H_2}} \right)_6}N{H_2} + nHOOC{\left( {C{H_2}} \right)_4}COOH$$
118. The polymer which has conducting power is
A
polyethylene
B
polybutadiene
C
polystyrene
D
polyacetylene
Answer :
polyacetylene
119. Which of the following is currently used as a tyre cord ?
A
Terylene
B
Polyethylene
C
Polypropylene
D
Nylon - 6
Answer :
Nylon - 6
120. Which of the following compound is used for preparation of melamine formaldehyde polymer ?
A
B
C
D
Answer :
