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2022

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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 ...

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 (20)

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 (31)

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 (5)

Which of following is a chain growth polymer

a.  Polystyrene b. Protein c. Starch d. Nucleic acid Ans. b (7)

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

a. Butyal rubber b. Poly styrene c. Starch d. PVC Ans. a (10)

12. Match the following correctly

      Catalyst                                 ...

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 (8)

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

(a)      Half                                     ...

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     ...

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...

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...

A tangential force F is applied on a disc of radius R, due to which it deflects through an angle θ from its initial position. The work done by this force would be

(a)       FR (b)      Fθ (c)     FR/θ (d)    FRθ Ans. d (31)

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...

108. If a body completes one revolution in Π sec then the moment of inertia would be

(a)       Equal to rotational kinetic energy (b)       Double of rotational kinetic energy (c)       Half of rotational...

The Zieglar- natta catalysis are

a. Sterospecific b. Non-metallic complexes c. Gaseous catalysts d. Universal in all polymerisation reactionos Ans. a (7)

107. Rotational kinetic energy of a given body about an axis is proportional to

(a)           Time period (b)          (Time period)2 (c)           (Time period)–1 (d)          (time period)–2 Ans.  d (11)

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 (14)

106. A circular disc has a mass of 1 kg and radius 40 cm. It is rotating about an axis passing through its centre and perpendicular to its plane with a speed of 10 rev/s. The work done in joules in stopping it would be

(a)       4 (b)      47.5 (c)      79 (d)     158 Ans. d (18)

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....

105. A solid sphere of mass 1 kg rolls on a table with linear speed 1 m/s. Its total kinetic energy is

(a)       1 J (b)      0.5 J (c)      0.7 J (d)     1.4 J Ans. c (6)

104. A symmetrical body of mass M and radius R is rolling without slipping on a horizontal surface with linear speed v. Then its angular speed is

(a)   v/R (b)  Continuously increasing (c)   Dependent on mass (d)  Independent of radius (R) Ans. a (76)

103. The ratio of kinetic energies of two spheres rolling with equal centre of mass velocities is 2 : 1. If their radii are in the ratio 2 : 1; then the ratio of their masses will be

(a)    2:1 (b)   1:8 (c)    1:7 (d)   2√2:1 Ans. a (15)

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 (8)

102. A disc of radius 1m and 4 kg mass rolls on a horizontal plane without slipping in such a way that its centre of mass moves with a speed of 10 cm/s Its rotational kinetic energy is

(a)   0.01 erg (b)   0.02 joule (c)  0.03 joule (d) 0.01 joule Ans. d (61)

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 (11)

101. The speed of rolling of a ring of mass M changes from V to 3V. What is the change in its kinetic energy

(a)    3MV2        (b)   4MV2 (c)   6 MV2 (d)  8MV2 Ans. d (415)

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 (93)

100. A solid sphere is moving on a horizontal plane. Ratio of its transitional Kinetic energy and rotational energy is

(a)    1/5 (b)   5/2 (c)   3/5 (d)   5/7 Ans. b (7)

The product of addition polymerisation reaction is

a.  PVC b. Nylon c. Terylene d. Polyamide Ans. a (54)

99. Ratio of kinetic energy and rotational energy in the motion of a disc is

(a)    1 : 1 (b)    2 : 7 (c)    1 : 2 (d)   3 : 1 Ans. ...

An example of chain growth polymer is

a. Nylon – 66 b. Bakelite c. Terylene d. Teflon Ans. d (52)

98.

A body of moment of inertia of 3kg-m2 rotating with an angular speed of 2 rad/sec has the same kinetic...

Which of the following is a thermosetting polymer

a. Nylon 6 b. PVC c. Bakelite d. Buna-N Ans.c (11)

92.

The moment of inertia of a body about a given axis is 2.4 kg–m2.  To produce a rotational kinetic energy...

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                           ...

90.

In a bicycle the radius of rear wheel is twice the radius of front wheel.  If rF and rr are the radii,...

85.

A smooth sphere A is moving on a frictionless horizontal plane with angular speed ω and center of mass with...

69.

If I1 is the moment of inertia of a thin rod about an axis perpendicular to its length and passing...

67.

A circular disc A of radius r is made from an iron plate of thickness t and another circular disc...

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