Polymers Test

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Polymers Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

Z-average molar mass $$(\bar M _ {z})$$ is defined as:

A
$$\dfrac{\sum NiMi^2}{\sum NiMi}$$

B
$$\dfrac{\sum NiMi}{\sum Ni}$$

C
$$\dfrac{\sum NiMi^3}{\sum NiMi^2}$$

D
$$\dfrac{\sum NiMi^3}{\sum NiMi}$$

Solution

Z-average molar mass $$(\bar M _ {z})$$ is defined as $$\dfrac{\sum NiMi^3}{\sum NiMi^2}$$

where Mi is the molecular weight of a chain, Ni is the number of chains of that molecular weight, and i is the number of polymer molecules
Question 2
1 / -0

$$F_2C=CF_2$$ is a monomer of:

A
Teflon

B
Glyptal

C
Buna-S

D
Nylon 6

Solution

Polytetrafluoroethylene (PTFE) or Teflon is formed from the polymerization of tetrafluoroethylene.
Question 3
1 / -0

Which of the following statements is not true about polymers ?

A
Polymers have high viscosity

B
Polymers do not carry any charge

C
Polymers scatter light

D
Polymers have low molecular weight

Solution

Polymers have very high molecular weight $$ (10^3 =10^7 \mu)$$. Hence, they are called macromolecules. The rest of the properties are given in option A, B and C are true. So the correct answer is (D).
Question 4
1 / -0

Which of the following polymers can be used for lubrication and as an insulator ?

A
SBR

B
PAN

C
PTFE

D
PVC

Solution
Question 5
1 / -0

Which of the following is a fully flourinated polymer ?

A
Thiokol

B
Teflon

C
Neoprene

D
PVC

Solution

Polytetrafluoroethylene (PTFE) or Teflon is formed by tetrafluoroethylene. Thiokol, Neoprene, and PVC are formed by polysulphide, chloroprene, vinylchloride.
Question 6
1 / -0

Statement 1: Novolac is soft and has a low melting point.

Statement 2: It is highly cross-linked polymer.

A
Statement 1 is true; statement 2 is true; statement 2 is the correct explanation of statement 1

B
Statement 1 is true; statement 2 is true; statement 2 is not the correct explanation of statement 1

C
Statement 1 is true; statement 2 is false

D
Statement 1 is false; statement 2 is true

Solution

Novolac is soft and has a low melting point. It is a linear condensation polymer (not crosslinked) of phenol and formaldehyde as s shown in the figure.
Statement 1 is true and statement 2 is false.

Option C is correct.
Question 7
1 / -0

Acrylonitrile, butadiene and styrene are a kind of:

A
addition polymer

B
co-polymer

C
homopolymer

D
thermosetting polymer

Solution

ABS or acrylonitrile, butadiene and styrene are a common thermoplastic polymer formed by copolymerization of these three monomers as shown.

Hence, the correct option is B.
Question 8
1 / -0

Which one of the following polymer is prepared by condensation polymerization?

A
Polystyrene

B
Nylon - $$6,\:6$$

C
Teflon

D
Rubber

Solution

Condensation polymers are formed through a condensation reaction, where molecules join together, losing small molecules as byproducts. For e.g., Nylon - $$6,\:6$$ is formed by condensation polymerization of adipic acid and hexamethylenediamine.
Whereas Polystyrene, Teflon and Rubber all are formed by chain-growth polymerization of monomers styrene, tetrafluoroethylene and isoprene respectively.
Here, an unsaturated monomer molecule adds to the active site of a growing polymeric chain one at a time.

Option B is correct.
Question 9
1 / -0

Chloroprene is the monomer of:

A
PVC

B
Neoprene

C
Polystyrene

D
Polythene

Solution

Neoprene polymerizes from its monomer unit chloroprene.
Option B is correct.
Question 10
1 / -0

Bakelite is ___.

A
rubber

B
rayon

C
brittle plastic

D
plasticisers