Polymer Technology

111. Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800?

1. 50000
2. 51600
3. 49200
4. 50800

View answer

112. Molecular weight of polymers are in the range of

1. 10 to 10³
2. 10²-10⁷
3. 10⁷-10⁹
4. 10⁹-10¹¹

View answer

113. Molecular weights of plastics ranges from

1. 1000 to 5000
2. 5000 to 1000
3. 20000 to 25000
4. 10⁹ to 10¹¹

View answer

114. Most commonly used rubber vulcanisation agent is

1. Sulphur
2. Bromine
3. Platinum
4. Alumina

View answer

115. Most of the fibre forming polymers are crystalline in nature, one of the exceptions being _________ which is amorphous in nature.

1. Nylon
2. Polyacrylonitrile
3. Polypropylene
4. Polyester

View answer

116. Most of the plastics are safe to be used upto a maximum temperature of _________ °C.

1. 100
2. 150
3. 350
4. 450

View answer

117. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?

1. Ammonium alum
2. Potassium alum
3. Both ‘a’ & ‘b’
4. Neither ‘a’ nor ‘b’

View answer

118. Neoprene is a

1. Monomer
2. Synthetic rubber
3. Polyester
4. None of these

View answer

119. Neoprene is chemically known as

1. Polybutadiene
2. Styrene butadiene rubber (SBR)
3. Polyurethane
4. Poly chloroprene

View answer

120. Neoprene is rendered non-inflammable, because of

1. Its cross-linked structure
2. Its linear chain structure
3. The presence of chlorine atoms in its monomer
4. The absence of chlorine atoms in its monomer

View answer