May, 2022Flame Institute

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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)

Phenol is used in the manufacture of

a. Bakelite b. Polystyrene c. Nylon d. PVC Ans. a (11)

Which is the monomer of polypeptide

a. Propene b. Butadiene c. Adipi acid d. Amino acid Ans. d (7)

The polymer obtained from the following reaction is :

Ans. a (15)

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 (9)

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 (19)

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 (4)

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 CH 3 SiCl 3 d. SiCl 4 and (CH 3) 3 SiCl Ans. b (4)

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 (10)

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 (12)

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 Ans. c (31)

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 (44)

The straight chain polymer is formed by

a. Hydrolysis of (CH3 )3 SiCl followed by condensation b. Hydrolysis of CH3 SiCl3 followed by condensation c. Hydrolysis of (CH 3)4 Si by addition polymerisation d. Hydrolysis of (CH 3)2 SiCl 2 followed by condensation polymerisation Ans. d (11)

114. A wheel of radius r rolls without slipping with a speed v on a horizontal road. When it is at a point A on the road, a small jump of mud separates from the wheel at its highest point B and drops at point C on the road. The distance AC will be

(a) v√r/g (b) 2v√r/g (c) 4v√r/g (d) √3r/g Ans. c (18)

Buna -S rubber is which of the following of 1-3 butadiene and styrene

a. Polymers b. Copolymer c. Addition d. Condensation polymer Ans. b (30)

113. An engine develops 100 kW, when rotating at 1800 rpm. Torque required to deliver the power is

(a) 531 N–m (b) 570 N–m (c) 520 N–m (d) 551 N–m Ans. a (4)

Which of following is a chain growth polymer

a. Polystyrene b. Protein c. Starch d. Nucleic acid Ans. b (6)

Which of the following polymer is formed by cationic addition polymerization reaction

a. Butyal rubber b. Poly styrene c. Starch d. PVC Ans. a (9)

12. Match the following correctly

Catalyst Industrial Product A. V2 O5 …

110. If the rotational kinetic energy of a body is increased by 300% then the percentage increase in its angular momentum will be

(a) 600% (b) 150% (c) 100% (d) 1500% Ans. c (7)

23. If the length of a wire is reduced to half, then it can hold the ……… load

(a) Half (b) Same (c) Double …

22. A and B are two wires. The radius of A is twice that of B. They are stretched by the some load. Then the stress on B is

(a) Equal to that on A (b) Four times that on A (c) Two times that on A (d) Half that on A Explanation-B (24)

The catalyst used in the manufacture of polyethene by ziegler method is

a. Titanium tetrachloride and triphenyl aluminium b. Titanium tetrachloride and triethyl aluminium c. Titanium dioxide d. titanium isopropoxide Ans. b (9)