2022Flame Institute

Which is the monomer of Neoprene is the following

Ans. d (8)

Which of the following polymer contains amide linkage

a. Nylon -66 b. Terylene c. Teflon d. Bakelite Ans. a (16)

In elastomer, intermolecular forces are

a. Nil b. Weak c. Strong d. Very strong Ans. b (6)

Which of the following is fully flourinated polymer

a. Neoprene b. Teflon c. Thiokol d. PVC Ans. b (5)

Orlon is a polymer of

a. Styrene b. Tetrafluoro ethylene c. Vinyl chloride d. Acrylonitrile Ans. d (15)

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 (8)

Which of the following is teflon

Ans. c (8)

Which of the following has amide links

a. Protein b. Nylon c. Peptide d. All of these Ans. d (6)

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 strong C- C bond c. They have linear molecules consisting of very long chains d. They have linear molecules interlinked …

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

Ans. b (56)

F C2 = CF 2 is the monomer of

a. Nylon – 6 b. Buna – S c. Glyptal d. Teflon Ans. d (8)

Teryene is a

a. Polyamide b. Polyester c. Polyethlene d. Polypropylene Ans. b (9)

As the molecular weight increases the tensile strength of polymers

a. Increases b. Decreases c. Remains unchanged d. Uncertain Ans. a (15)

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 (7)

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) nmgR (c) mgR n2/n2+1 (d) mgR n/n+1 Answer: …

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 (d) 1.90×102 metres Answer: a (43)

Which of the following is resistant to boiling aqua-regia

a. Polythene b. Perspex c. Teflon d. Bakelite Ans. c (6)

Caprolactum is used for the manufacture of

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

Protein is

a. Polyester b. Polyamide c. Polythylene d. Polyanhydride Ans. b (7)

PVC is prepared by the polymerisation of

a. Ethylene b. 1- chloroethene c. Propene d. 1 – chloroethene Ans. d (6)

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

a. Benzene b. Phenyl amine c. Benzaldehyde d. Phenol Ans. d (6)

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 (8)

Among (i) – (iv)

The compound that does not undergo polymerization under radical initiation, is a. (i) b. (ii) c. (iii) d. (iv) Ans. d (8)

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) (a) 1.0×10-7 N (b) …

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 terephthalate and ethylene glycol Ans. c (11)