ShilpaFlame Institute

When Condensation product of hexamethylenediamine and adipic acid is heated to 553 (280 ° C) in an atmosphere of nitrogen for about 4-5 hours, the product obtained is

a. Solid polymer of nylon 66 b. liquid polymer of nylon 66 c. Gaseous polymer of nylon 66 d. Liquid polymer of nylon 6 Ans. b (4)

Polymer formation from monomers starts by

a. Condensation reaction between monomers b. corrdinate reaction between monomers c. Conversaion of monomers to monomers ions by protons d.Hydrolysis of monomers Ans. a (8)

The Zieglar- natta catalysis are

a. Sterospecific b. Non-metallic complexes c. Gaseous catalysts d. Universal in all polymerisation reactionos Ans. a (6)

High density polyethylene (HDPE) can be prepared from ethylene by

a. Ziegler- Natta process b. Heating with peroxides c. Condensing in sealed tubes d. Condensing with styrenes Ans. a (12)

In the manufacture of polythene by the Ziegler process using ethylne the temperature for proper polymerisation required is

a. Below 10° C b. 10° to 50° C c. 50° to 80° C d. 80° to 140° C Ans. c (5)

In the process of forming ‘mercerised cellulose’ the swelling of cellulose is caused by

a. Water b. Na 2 Co 3 c. A q. NaOH d. Aq. HCl Ans. c (7)

The catalyst used for the polymerisation of olefins is

a. Ziegler Natta catalyst b. Wilkinson’s catalyst c. Pd- catalyst d. Zeise’s salt catalyst Ans. a (10)

Vinyl chloride can be converted into PVC. In this reaction, the catalyst used is

a. Peroxides b. Cuprous chooride c. Anhydrous zinc chloride d. Anhydrous AlCl3 Ans. a (44)

The product of addition polymerisation reaction is

a. PVC b. Nylon c. Terylene d. Polyamide Ans. a (6)

An example of chain growth polymer is

a. Nylon – 66 b. Bakelite c. Terylene d. Teflon Ans. d (47)

Which of the following is a thermosetting polymer

a. Nylon 6 b. PVC c. Bakelite d. Buna-N Ans.c (10)

If it is assumed that the spinning motion of earth increases, then the weight of a body on equator

(a) Decreases (b) Remains constant (c) Increases (d) Becomes more at poles Answer: a (3)

A body of mass m rises to height h = R/5 from the earth’s surface, where R is earth’s radius. If g is acceleration due to gravity at earth’s surface, the increase in potential energy is

(a) mgh (b) 4/5 mgh (c) 5/6 mgh (d) 6/7 mgh Answer: c (12)

The gravitational field due to a mass distribution is E = K/x3 in the x-direction. (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is

(a) K/x (b) K/2x (c) K/x2 (d) K/2×2 Answer: d (4)

Which one of the following is an example of a thermosetting polymer

Ans. b (11)

In a gravitational field, at a point where the gravitational potential is zero

(a) The gravitational field is necessarily zero (b) The gravitational field is not necessarily zero (c) Nothing can be said definitely about the gravitational field (d) None of these Answer: a (22)

26. Regarding cross – linked or network polymers, which of the following statements is incorrect

a. They contain covalent bonds between various linear polymer chains b. They are formed from bi- and tri – functional monomers c. Examples are bakelite ad melamine d. They contain strong covalent bonds in their polymer chains Ans. d (10)