Polymers Test

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Polymers Test - 23

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Weekly Quiz Competition

Question 1
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Which of the following correctly describes teflon?

A
It is an antiseptic.

B
It is an antifreeze.

C
It is an anti-corrosive plastic.

D
All of the above

Solution

Teflon (tetrafluoroethylene) is an anti-corrosive plastic. It is flexible and inert to solvent acids. Hence, it is used in making non-stick utensils.
Question 2
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Bakelite polymer is formed by the polymerization of:

A
methanol and salicyladehyde

B
methanal and hydroxy benzene

C
ethanal and hydroxy benzene

D
ethanal and cinnamic acid

Solution

Bakelite is a thermosetting phenol formaldehyde resin, formed from elimination reaction of phenol with formaldehyde.
Question 3
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Monomer of $$\left[ - \underset{CH_3}{\underset{|}{\overset{CH_3}{\overset{|}{C}}}} - CH_2 - \right]_n$$
Monomer of the given compound is:

A
2-Methyl propene

B
Styrene

C
Propylene

D
Ethene

Solution

Polymer $$\longrightarrow$$ (Refer to Image 1) (polyisobutane) polymerisation
$$n . H_3C - \underset{CH_3}{\underset{|}{C}} = CH_2$$
$$(2-methylpropene)$$ or, $$isobutylene$$.
Polymerisation of $$2-$$methylpropene or $$isobutylene$$ produces polyisobutene or $$poly(2-methyl-propene)$$.
Question 4
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Which of the following is/are polyamide molecule?

A
Terylene

B
Rayon

C
Nylon - $$6$$

D
Polystyrene

Solution

Nylon-6 is a polyamide molecule.
Question 5
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$$\left [NH \left (CH_{2} \right )_6NHCO \left (CH_{2} \right )_{4} CO \right ]_{n}$$ is a:

A
copolymer

B
addition polymer

C
thermosetting polymer

D
homopolymer

Solution

The given structure in the question is a nylon 6,6 polymer. It is a copolymer because it is made up of two types of monomer, adipic acid, and hexamethylenediamine.
Hence, the correct option is A.
Question 6
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Which of the following is not a natural polymer?

A
Wool

B
Silk

C
Cotton

D
Teflon

Solution

Teflon is a Addition polymer.$$(-CF_2-CF_1-)_n$$.
not a natural polymer.
Question 7
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Natural wool is scarce and expensive. Identify the synthetic fibre which can be substituted in its place for making winter wear.

A
Polyester

B
Acrylic

C
Terylene

D
Terycot

Solution

Acrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) and is used to make artificial wool.
Correct option is 'B'
Question 8
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In fractional distillation of petroleum, the vapours with highest boiling point:

A
condense in uppermost portion

B
condense in lowermost portion

C
condense in middle portion

D
do not condense

Solution

In fractional distillation of petroleum, the vapours with highest boiling point condense in lowermost portion.As the vapors of highest boiling point evaporates later and condenses later at lower portion.
Hence option B is correct.
Question 9
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The figure below shows three steps (A, B, C) of Polymerase Chain Reaction (PCR). Select the option giving
correct identification together with what it represents ?

A
A - Denaturation at a temperature of about $$50^0C$$

B
C - Extension in the presence of heat stable DNA polymerase

C
A - Annealing with two sets of primers

D
B - Denaturation at a temperature of about $$98^0C$$ separating the two DNA strands

Solution

$$\text{Heat stable DNA polymerase. Heat stability is very important because}$$$$\text{ PCR reaction is performed at various temperatures.}$$$$\text{This heat-stable DNA polymerase is obtained from thermophilic bacteria Thermus aquaticus,}$$$$\text{ the inhabitant of hot springs}$$
Question 10
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Which of the following is used for coating a non-stick pan?

A
Nylon

B
Zefron

C
Rayon

D
Teflon

Solution