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May 2022

Home2022MayPage 32

There are two bodies of masses 100 kg and 10000 kg separated by a distance 1 m. At what distance from the smaller body, the intensity of gravitational field will be zero

(a)    1/9 m                          (b) 1/10 m (c) ...

Structures of some common polymers are given. Which one of is not correctly represented

Ans. b (6)

Amylopectin is a branched polymer of

a. β – D – glucose b. α – D – glucose c. Fructose d. Rhamnose Ans. b (8)

In elastomer, intermolecular forces are

a. Nil b. Weak c. Strong d. Very strong Ans. b (9)

A rocket is launched with velocity 10 km/s. If radius of earth is R, then maximum height attained by it will be

(a)      2R                                  (b)   ...

Nylon is an example of

a. Polythene b. Polyester c. Polysaccharide d. Polyamide Ans. d (8)

If mass of earth is M, radius is R and gravitational constant is G, then work done to take 1 kg mass from earth surface to infinity will be

(a)      √GM/2R                      (b)  GM/R (c)   2√GM/R       ...

Orlon has a unit

a. Vinyl cyanide b. Acrolein c. Glycol d. Isoprene Ans. a (7)

The commercial name of polycrylonitrile is……

a. Decron b. Orlon (acrilan) c. PVC d. Bakelite Ans. b (7)

A polymer containing nitrogen is

a. Bakelite b. Dacron c. Rubber d. Nylon-66 Ans. d (7)

Which of the following statements is false

a. Artificial silk is derived from cellulose b. Nylon – 66 is an example of elastomer c. The repeat unit...

Silcones are a group of organosilicon polymers containing

a. Si – O – Si linkage b. O – Si – O linkage c. Si – C – linkage...

In bakelite, the rings are joined to each other through

Ans. a (9)

Which polymer among the following polymers does NOT soften on heating

a. Bakelite b. Polythene c. polystyrene d. PVC Ans. a (16)

Which one of the following can be used as monomer in a polymerisation reaction

a. CH3 CH 2 CI b. CH 3 CH2 OH c. C 6 H 6 d. C 3 H 6 Ans. d (34)

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 (22)

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 (9)

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 (8)

Caprolactum is used for the manufacture of

a. Nylon – 6 b. Teflon c. Terylene d. Bakelite Ans. a (10)

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....
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