CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 9 - MCQExams.com

$$1,\:3$$ - butadiene and acrylonitrile undergo co-polymerization to give ___
  • Buna - S
  • Buna - N
  • Buna - A
  • All
$$\bar{M_{n}}$$ and $$\bar{M_{w}}$$ of a synthetic polymer are related as
  • $$\bar{M_{n}}< \bar{M_{w}}$$
  • $$\bar{M_{n}}> \bar{M_{w}}$$
  • $$\bar{M_{n}}= \bar{M_{w}}$$
  • $$\bar{M_{n}}= \sqrt{\bar{M_{w}}}$$
Which one is resistant to vegetable and mineral oils?
  • Neoprene
  • Glyptal
  • Nitrile rubber
  • Both B and C
Monomer of PTFE is:
  • Ethylene
  • Propylene
  • Butadiene
  • Tetrafluoro ethylene
Polymer used in making capsules is:
  • poly glycolic acid
  • poly lactic acid
  • Nylon - $$2$$ - Nylon - $$6$$
  • PHBV
Methanal and Phenol react in the presence of base to give:
  • Bakelite
  • Polyethylene
  • Dacron
  • Nylon - $$6,\:6$$
The most common type of molecular weights used in the case of polymer is :
  • number average molecular weight method
  • z - average molecular weight method
  • viscosity average molecular weight method
  • all of the above
Which of the following is used in making automobile tyres and foot wear?
  • Vulcanised rubber
  • Neoprene
  • Plexi glass
  • Glyptal
Which of the following monomer in excess makes $$PHBV$$ more flexible?
  • $$\beta -$$ hydroxy butanoic acid
  • $$\alpha -$$hydroxy butanoic acid
  • $$\beta -$$ hydroxy pentanoic acid
  • $$\alpha -$$hydroxy pentanoic acid
Common application of GRN in life is :
  • making oil seals
  • manufacture of hose pipes
  • tank lining
  • all the above
Which of the following is used as a substitute of glass?
  • Glyptal
  • Urea formaldehyde resin
  • PMMA
  • All
What is not true about polymers?
  • Polymers do not carry charge.
  • Polymers have high viscosity.
  • Polymers scatter light.
  • Polymers have low molecular weight.
Which of the following is an elastomer?
  • Buna - N
  • Buna - S
  • Neoprene
  • All
Hair wigs are made from a co-polymer of vinyl chloride and acrylonitirile and is called :
  • PVC
  • dynel
  • polyacrylonitrile
  • cellulose
Which of the following is poor resistant to weather?
  • Polyethene
  • Polystyrene
  • PVC
  • All
Which of the following fibres are made of polyamides?
  • Dacron
  • Orlon
  • Nylon
  • Rayon
Which of the following has extreme resistance to abrasion?
  • Nylon
  • Perlon - L
  • Dacron
  • Both A and B
Which of the following structures represents terylene?
Nylon is :
  • polyester
  • polyamide
  • orlon
  • terylene
Which of the following is resistant to petrol, lubricating oils and organic solvents?
  • Nitrile rubber
  • Buna - N
  • GRN
  • All of these
$$CH_3-CH_3\xrightarrow{Pyrolysis}A$$

$$A\xrightarrow [C_6H_5-CO-O-O-CO-C_6H_5]{1000-2000 atm, traces\ of \ O_2, \Delta} B$$

$$A\xrightarrow [6-7 atm, \Delta]{Ziegler-Natta\ Catalyst}C$$  

Here, B and C are:
  • LDPE, HDPE
  • HDPE, LDPE
  • LDPE, LDPE
  • HDPE, HDPE

Assertion(A):  Nylon - $$6$$ is obtained by polymerization of caprolactam.

Reason(R):  It is a polyamide.  
  • Both A and R are correct and R is the correct explanation of the A.
  • Both A and R are correct but R is not the correct explanation of the A.
  • A is correct , but R is incorrect.
  • A is incorrect, but R is correct.

A. Styrene is more reactive than propylene towards cationic polymerization

R. The carbocation resulting from styrene is more stable than that resulting from propylene.

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  • Both A and R are correct and R is the correct explanation of the A
  • Both A and R are correct but R is not the correct explanation of the A
  • A is correct but R is incorrect
  • A is incorrect but R is correct
STATEMENT-1 : PMMA (Polymethyl methacrylate) is used for making lenses and light covers.
STATEMENT-2 : It has excellent light transmission properties.
  • STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is False
  • STATEMENT-1 is False, STATEMENT-2 is True
A: Polymethyl methacrylate is also known as plexi glass.
R: PMMA is used in decorative articles.
  • Both A and R are correct and R is the correct explanation of the A
  • Both A and R are correct but R is not the correct explanation of the A
  • A is correct but R is in correct
  • A is incorrect but R is correct
A : A mixture of raw rubber and sulphur on heating at $$373\:K$$ - $$415\:K$$ gives vulcanised rubber.
R : ZnO decreases the rate of vulcanisation of rubber.
  • both A and R are correct and R is the correct explanation of the A
  • both A and R are correct but R is not the correct explanation of the A
  • A is correct but R is incorrect
  • A is incorrect but R is correct
Among the following, elastomers are:
  • Natural rubber
  • Low sulphur rubber
  • Buna-S
  • Butyl rubber
A : The empirical formula of natural rubber is $$C_{5}H_{8}$$.
R : Natural rubber contains no conjugate double bonds.
  • Both A and R are correct and R is the correct explanation of the A
  • Both A and R are correct but R is not the correct explanation of the A
  • A is correct but R is in correct
  • A is incorrect but R is correct
Which of the following fibres are made up of polyamides?
  • Wool
  • Natural silk
  • Artifical silk
  • Nylon
Assertion:
$$\bar{M_{n}}$$ value is always greater than $$\bar{M_{w}}$$ value for synthetic polymers.

Reason:
The mass average molecular weight of the polymer is equal to $$\bar{M_{w}}$$.
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct
In which of the following polymer, monomer is/are optically active?
  • Polyglycolic acid
  • Polylactic acid
  • PHBV
  • Nylon-$$2$$-nylon-$$6$$
The cross-linked polymers possess the property of:
  • being soluble in common organic solvents
  • not undergoing change while being heated
  • forming a hard mass which can be remoulded
  • high resistance to heat and mechanical deformation
Which one of the following is a condensation polymer ?
  • Polyethene
  • Polyester
  • Polystyrene
  • Ploypropylene
Assertion (A) : The plants yield a milky suspension of crude rubber called latex.
Reason (R) : The latex contains about $$85\%$$ rubber.
  • Both A and R are correct and R is the correct explanation of the A
  • Both A and R are correct but R is not the correct explanation of the A
  • A is correct but R is incorrect
  • A is incorrect but R is correct
List - I                                       List - II
A) Polystyrene                        p) Condensation polymer
B) Polythene                           q) Thermoplastic polymer
C) Nylon- $$6, \:6$$                        r) Polyamide
D) Terylene                             s) Addition polymer
  • (a - q,s), (b - q,s), (c - p,q,r), (d - p)
  • (a - p), (b - s), (c - p,r), (d - p,q)
  • (a - s), (b - q), (c - p,r), (d - q)
  • (a - q), (b - s), (c - r), (d - p,q)
 (1) : For natural polymers, PDI value is always equal to unity.
 (2) : The ratio of $$\bar{M_{w}}$$ and $$\bar{M_{n}}$$ of a polymer is called PDI.  
  • Both 1 and 2 are correct and 2 is the correct explanation of the 1
  • Both 1 and 2 are correct but 2 is not the correct explanation of the 1
  • 1 is correct but 2 is in correct
  • 1 is incorrect but 2 is correct
Monomer of $$\left[ - \underset{CH_3}{\underset{|}{\overset{CH_3}{\overset{|}{C}}}} - CH_2 - \right]_n$$
Monomer of the given compound is:
  • 2-Methyl propene
  • Styrene
  • Propylene
  • Ethene
List -I                                List -II
A) Polystyrene               p) $$C_{6}H_{5}-CH=CH_{2}$$
B) Buna-S                      q) $$CH_{2}=CH-CH=CH_{2}$$
C) Buna - N                    r) $$CH_{2}OH-CH_{2}OH$$
D) Terylene                    s) Condensation polymer
  • a- p
  • b- p,q
  • c-r
  • d-r,s
Generally, polyamides are _____.
  • fibres
  • thermoplastics
  • thermosetting
  • elastomeres
Which one of the following sets form the biodegradable polymer?
  • $$H_2N - CH_2-COOH$$ and $$H_2N-(CH_2)_5-COOH$$
  • $$CH_2=CH - CN$$ and $$CH_2=CH - CH = CH_2$$
Which of the following is not a natural polymer?
  • Wool
  • Silk
  • Cotton
  • Teflon
$$\left [NH \left (CH_{2} \right )_6NHCO \left (CH_{2} \right )_{4} CO  \right ]_{n}$$ is a:
  • copolymer
  • addition polymer
  • thermosetting polymer
  • homopolymer
Which of the following correctly describes teflon?
  • It is an antiseptic.
  • It is an antifreeze.
  • It is an anti-corrosive plastic.
  • All of the above
Bakelite polymer is formed by the polymerization of:
  • methanol and salicyladehyde
  • methanal and hydroxy benzene
  • ethanal and hydroxy benzene
  • ethanal and cinnamic acid
Select a copolymer from the following:
  • Orlon
  • PVC
  • PHBV
  • Teflon
Which one is not a step polymer ?
  • Nylon-6, 6
  • Nylon-6
  • Glyptal
  • PMMA
Cellulose is a condensation polymer of:
  • Maltose
  • $$\beta - Glucose$$
  • $$\alpha - Glucose$$
  • $$\beta -Fructose$$
The basic unit of neoprene is_______________.
  • chloroprene
  • isoprene
  • styrene
  • butadiene
Nylon-6 is prepared from ?
  • Adipic acid and hexamethylene diamine
  • Caprolactum
  • Urea and formaldehyde
  • None of these
All terpenes have carbon skeletons made up of____________.
  • isoprene units
  • vinyl units
  • alkenes
  • ethylenes units
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