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2022

Home2022Page 74

Which is the monomer of Neoprene is the following

Ans. d (9)

Which of the following polymer contains amide linkage

a. Nylon -66 b. Terylene c. Teflon d. Bakelite Ans. a (21)

In elastomer, intermolecular forces are

a. Nil b. Weak c. Strong d. Very strong Ans. b (7)

Which of the following is fully flourinated polymer

a. Neoprene b. Teflon c. Thiokol d. PVC Ans. b (8)

Orlon is a polymer of

a. Styrene b. Tetrafluoro ethylene c. Vinyl chloride d. Acrylonitrile Ans. d (16)

The plastic household crockery is prepared by using

a. Melamine and tetrafluoroethane b. Malonic acid and hexamethyleneamine c. Melamine and vinyl acetate d. Melamine and formaldehyde Ans. d...

Which of the following is teflon

Ans. c (9)

Which of the following has amide links

a. Protein b. Nylon c. Peptide d. All of these Ans. d (7)

Synthetic fibres like nylon- 66 are very strong because

a. They have high molecular weights and high melting points b. They have a high  degree of cross- linking by...

Acrilan is a hard, horny and a high melting material. Which of the following represents is structure

  Ans. b (66)

F C2   = CF 2     is the monomer of 

a. Nylon – 6 b. Buna – S c. Glyptal d. Teflon Ans. d (9)

Teryene is a

a. Polyamide b. Polyester c. Polyethlene d. Polypropylene Ans. b (10)

As the molecular weight increases the tensile strength of polymers

a. Increases b. Decreases c. Remains unchanged d. Uncertain Ans. a (17)

The masses and radii of the earth and moon are  M1,R1 and M2,R2  respectively. Their centres are distance d apart. The minimum velocity with which a particle of mass m should be projected from a point midway between their centres so that it escapes to infinity is

answer-a (9)

The change in potential energy, when a body of mass m is raised to a height nR from the earth’s surface is (R = Radius of earth)

(a)   mgR n/n-1                                   (b) ...

The mass of the earth is  6.00 × 10^24 kg  and that of the moon is 7.40 × 10^22 kg  . The constant of gravitation G=6.67 × 10^-11 N-M^2/kg^2. The potential energy of the system is -7.79 × 10^28 joules  . The mean distance between the earth and moon is

(a)     3.80×108 metres                     (b) 3.37 ×106 metres (c)   7.60×104  metres   ...

Which of the following is resistant to boiling aqua-regia

a. Polythene b. Perspex c. Teflon d. Bakelite Ans. c (7)

Caprolactum is used for the manufacture of

a. Nylon – 6 b. Teflon c. Terylene d. Bakelite Ans. a (9)

Protein is

a. Polyester b. Polyamide c. Polythylene d. Polyanhydride Ans. b (10)

PVC is prepared by the polymerisation of

a. Ethylene b. 1- chloroethene c. Propene d. 1 – chloroethene Ans. d (7)

The compound required for the formation of a thermosetting polymer with methanal is

a. Benzene b. Phenyl amine c. Benzaldehyde d. Phenol Ans. d (9)

Teflon is a polymer of the monomer Or Teflon is obtained by the polymerisation of

a. Monofluoroethene b. Difluoroethene c. Trifluoroethene d. Tetrafluoroethene Ans. d (5)

The major product of the following reaction is :

  Ans. a (4)

Major product of the following reaction is :

  Ans. a (10)

Among (i) – (iv)

The compound that does not undergo polymerization under radical initiation, is a. (i) b. (ii) c. (iii) d. (iv) Ans....
24.To double the length of a iron wire having  area of cross-section 0.5 cm2, the required force will be  (Y=1012 dyne/cm2)...

The major product of the following reaction is

    Ans. c (12)

The monomers used in the production of nylon-66 are

a. Hexamethylene diamine and ehhylene glycol b. Adipic acid and ethylene glycol c. Adipic acid and hexamethylene diamine d. Dimethyl...

Phenol is used in the manufacture of

a. Bakelite b. Polystyrene c. Nylon d. PVC Ans. a (12)

Which is the monomer of polypeptide

a. Propene b. Butadiene c. Adipi acid d. Amino acid Ans. d (8)

The polymer obtained from the following reaction is :

    Ans. a   (23)

The structure of the polymer obtained by the following reaction is

  a. (i) b. (ii) c.(iii) d. (iv) Ans. a (6)

The formation of which of the following polymers involves hydrolysis reaction

a. Bakelite b. Nylon 6, 6 c. Terylene d. Nylon 6 Ans. d (11)

117. A uniform thin rod of length l is suspended from one of its ends and is rotated at f rotations per second. The rotational kinetic energy of the rod will be

(a)   2/3π2f2ml2 (b)   4/3 f2ml2 (c)    4π2f2ml2 (d)   Zero Ans. a (20)

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

a.  RSiCl 3 b.  R 2 SiCl 2 c. R 3  SiCl d. R4 Si Ans. a (7)

Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination, respectively, are

a.  CH 3 SiCl 3 and Si (CH 3 ) 4 b. (CH3 ) 2 SiCl 2 and (CH 3) 3  SiCl c.  (CH3 ) 2 SiCl 2 and...

116. If L, M and P are the angular momentum, mass and linear momentum of a particle respectively which of the following represents the kinetic energy of the particle when the particle rotates in a circle of radius R

(a)   L2/2M (b)  P2/2MR (c)   L2/2MR2 (d)   MP/2 Ans. c (16)

The species which can best serve as an initiator for the cationic polymerization is

a. LialH 4 b. HNO 3 c. AlCl 3 d. BuLi Ans. c (16)

115. A fly wheel of moment of inertia I is rotating at n revolutions per sec. The work needed to double the frequency would be

(a)       2π2  In2 (b)      4π2  In2 (c)       6π2  In2 (d)      8π2  In2...

In the preparation of Nylon -6 from cyclohexanone oxime use is made of a rearrangement reaction. This rearrangement reaction is called

a. Wolf rearrangment b. Amadori rearrangement c. Curtius rearrangement d. Beckmann rearrangement Ans. d (53)

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