CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 5 - MCQExams.com

Neoprene, a synthetic rubber contains which of the following element besides C and H?
  • $$N$$
  • $$O$$
  • $$Cl$$
  • $$F$$
Teflon is obtained by the polymerization of:
  • Monofluoroethene
  • Difluoroethene
  • Trifluoroethene
  • Tetrafluoroethene
In the natural rubber ‘Caoutchouc’, the isoprene units are joined by:
  • Head-to-head
  • Tail-to-tail
  • Head-to-tail
  • All of these
Molecular mass of a polymer is:
  • Small
  • Very small
  • Negligible
  • Large
Which of the following is synthetic rubber?
  • Buna-S
  • Neoprene
  • Both (a) and (b)
  • None of these
Bakelites are:
  • Rubber
  • Rayon
  • Resins
  • Plasticisers
Which of the following statements are incorrect about phenol- formaldehyde resin?
  • Novolac or resin is a linear polymer and is used in the manufacture of adhesive.
  • Novolac on heating with formaldehyde undergoes cross linking to form an infusible solid mass called bakelite
  • Novolac is prepared when (P/F) (phenol/formaldehyde) ratio is greater than 1, whereas bakelite is prepared when (P/F) ratio is less than 1
  • Novolac on heating with formaldehyde undergoes cross linking to form an infusible solid called melamine
State whether the statement is true or false. Rewrite the false statement correctly.
Polyvinyl chloride is a polymer of chloroethane.
  • True
  • False
A high molecular weight molecule built from a large number of small molecules is called a ____.
  • monomer
  • isomer
  • polymer
  • tautomer
Natural rubber is a:
  • trans isomer
  • cis isomer
  • racemic mixture
  • equal amount of cis and trans
Chloroprene is used in making
  • synthetic rubber
  • plastic
  • petrol
  • All of the above
Which of the following has the largest molecular mass?
  • Monomer
  • Dimer
  • Polymer
  • Oligomer
Which is not a polymer 
  • Ice
  • Starch
  • Protein
  • Cellulose
Styrene at room temperature is:
  • Solid
  • Liquid
  • Gas
  • Colloidal solution
Which one is a polymer compound?
  • $$SO_2$$
  • $$CO_2$$
  • $$CH_4$$
  • $$PVC$$
Natural rubber contains several thousand units of $$X$$, linked together in the polymer chain. $$X$$ is:
  • Neoprene
  • Isoprene
  • Chloroprene
  • Styrene
The monomer of natural polymer rubber is:
  • Neoprene
  • Isoprene
  • Chloroprene
  • Butadiene
Characteristic property of Teflon is:
  • 2000 poise viscosity
  • High surface tension
  • Non-inflammable and resistant to heat
  • Highly reactive
Bakelite is:
  • Chain-growth polymer
  • Step-growth polymer
  • Both (a) and (b)
  • Elastomer
Which of the following polymers can be used for lubrication and as an insulator?
  • SBR
  • PAN
  • PTFE
  • PVC
Which of the following is a common example of fibres?
  • Bakelite
  • Buna-S
  • Nylon-6,6
  • Nylon-6
Which of the following is a copolymer?
  • Polytetrafluoroethylene
  • Polyvinyl chloride
  • Polyethylene
  • Nylon-6,6
  • Natural rubber
$$ \sim\!\! [\!\! \sim NH(CH_2)_6 NHCO(CH_2)_4 CO\sim\!]_n\!\!\!\!\! \!\sim$$ is:
  • Addition polymer
  • Copolymer
  • Homopolymer
  • Thermosetting polymer
The basic unit of neoprene is:
  • Chloroprene
  • Isoprene
  • Styrene
  • Butadiene
A copolymer is:
  • Styrene butadiene rubber
  • Polythene
  • Terylene
  • Nylon
Which of the following is not a condensation polymer?
  • Nylon-6,6
  • PTFE
  • Dacron
  • Glyptal
The material used for making non stick utensils kitchen is : 
  • PVC
  • Polyether
  • Teflon
  • Rayon
The radical of phosphate among the following radicals is?
  • $$PO_4^{2-}$$
  • $$PO_4^{3-}$$
  • $$PO_2^{4}$$
  • $$PO_2^{2-}-$$
Natural rubber is a polymer of which substance?
  • Neoprene
  • Isoprene
  • $$1,3$$-Butadiene
  • Buna-N
For improving the tensile strength and quality of natural rubber, it is heated with sulphur. What is the name of this process?
  • Polymerization
  • Saponification
  • Vulcanization
  • Equalization
Vulcanization makes rubber
  • more elastic
  • soluble in inorganic solvent
  • crystalline
  • more stiff
Which of the following is not a true polymer?
  • Ethene
  • Styrene
  • Isoprene
  • Butadiene
Which of the following is condensation polymer?
  • Dacron
  • Teflon
  • PVC
  • Polythene
On the basis of the method of polymerization, polymers are classified as:
  • Only addition polymers
  • Only condensation polymers
  • both addition and condensation polymers
  • Copolymers
Teflon is a polymer of:
  • Tetrafluoroethylene
  • Tetraiodoethylene
  • Tetrachloroethylene
  • Tetrabromoethylene
Select the correct statement(s) about the given polymer :
(i) Monomer is $$CH_{2}=CH-CH=CH_{2} $$ and $$ CH_{2}=CH-CN$$.
(ii) It is a copolymer.
(iii) It is an addition polymer.

77297.jpg
  • (i) and (ii) only
  • (iii) only
  • (ii) only
  • (i), (ii) and (iii)
$$X-(CH_2)_4-X \xrightarrow [{HOOC-(CH_2)_4-COOH}] {Y}\quad \text{Condensation Polymer}$$

The correct functional group $$X$$ and the reagent/reaction conditions $$Y$$ in the following scheme are:
  • $$X=COOCH_{3},\ Y=H_{2}/Ni/heat$$
  • $$X=CONH_{2},\ Y=H_{2}/Ni/heat$$
  • $$X=CONH_{2},\ Y=Br_{2}/NaOH$$
  • $$X=CN,\ Y=H_{2}/Ni/heat$$
Which set is correctly matched?
  • Dacron or Terylene : Condensation polymer
  • PVC : Biodegradable polymer
  • Nylon - $$6,\: 6$$ : Addition polymer
  • Buna-S rubber : Natural polymer

The monomer of the polymer is:
70618.jpg
  • $$CH_{3}CH = CH.CH_{3}$$
  • $$CH_{3}CH = CH_{2}$$
  • $$(CH_{3})_{2} C = C (CH_{3})_{2}$$
  • $$CH_2=C-CH_3$$
                    $$|$$
                 $$CH_3$$

Natural wool is scarce and expensive. Identify the synthetic fibre which can be substituted in its place for making winter wear.
  • Polyester
  • Acrylic
  • Terylene
  • Terycot
In the above shown sequence, the final product $$F$$ is :
76288_be07214e079445539144c0b7748698db.png
  • bakelite
  • nylon - $$6$$
  • polyester
  • natural rubber
Which is/are the correct statement(s) regarding the polymer kevlar?
  • It is a polyamide.
  • It is a copolymer.
  • It has elastic property.
  • It is an addition polymer.
Buna-N synthetic rubber is a copolymer of:
  • $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-\mathrm{CH}=CH_2$$ and $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CH=\mathrm{C}\mathrm{H}_{2}$$
  • $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CH=\mathrm{C}\mathrm{H}_{2}$$ and $$\mathrm{H}_{5}\mathrm{C}_{6}-CH=\mathrm{C}\mathrm{H}_{2}$$
  • $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CN$$ and $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CH=\mathrm{C}\mathrm{H}_{2}$$
  • $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CN$$ and $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-\mathrm{C(CH_3)}=CH_2$$
Which of the following statements are correct about phenol-formaldehyde resin?
  • Novolac or resin is a linear polymer and is used in the manufacture of adhesive.
  • Bakelite is a cross-linked polymer and is used in making switches and plugs.
  • Novolac is prepared when (P/F) (phenol/formaldehyde) ratio is greater than $$1$$, whereas bakelite is prepared when (P/F) ratio is less than $$1$$.
  • Novolac is prepared when P/F $$< 1$$ and bakelite is prepared when P/F $$>1$$.
Which of the following is copolymer?
  • Styrene butadiene rubber
  • Polythene
  • Nylon
  • None of the above
A polymeric sample in which $$30\%$$ molecules have a molecular mass $$20,000$$, $$40\%$$ have $$30,000$$ and the rest $$30\%$$ have $$60,000$$. The $$( \bar{M}_{n})$$ and $$( \bar{M}_{w})$$ of this sample are, respectively:
  • $$36,000,\: 43,333$$
  • $$43,000,\: 36,000$$
  • $$72,000,\: 86,000$$
  • $$86,000, \:72,000$$
Statement 1: Bakelite is hard and has high melting point.

Statement 2: Intermolecular forces of attraction in it are H-bonding.
  • Statement 1 is true; statement 2 is true; statement 2 is the correct explanation of statement 1
  • Statement 1 is true; statement 2 is true; statement 2 is not the correct explanation of statement 1
  • Statement 1 is true; statement 2 is false
  • Statement 1 is false; statement 2 is true
Silk clothes are prepared from silkworms at which of the following stage of its cycle?
The monomer unit for the given compound is:

631978_95548b90e8d44a5c9773d9ddc6ee5f60.png
  • $$2$$-methylpropene
  • styrene
  • propylene
  • ethene
Polymer used to make gasket of pressure cooker is:
  • polythene
  • nylon
  • teflon
  • thiokol
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