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May 2022

Home2022MayPage 34

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...

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      ...

97. A body is rolling without slipping on a horizontal plane. If the rotational energy of the body is 40% of the total kinetic energy, then the body might be

(a)  Cylinder (b)  Hollow sphere (c)   Solid cylinder (d)  Ring Ans. b (13)

96. A spherical ball rolls on a table without slipping. Then the fraction of its total energy associated with rotation is

(a)  2/5 (b)  2/7 (c)  3/5 (d)  3/7 Ans. b (4)

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     ...

95. A thin hollow cylinder open at both ends:

(i) Slides without rotating (ii) Rolls without slipping, with the same speed. The ratio of kinetic energy in the two...

94. The ratio of rotational and translatory kinetic energies of a sphere is

(a)  2/9 (b)  2/7 (c)  2/5 (d)  7/2 Ans. c (9)

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

Ans. b (18)

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...

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...

If earth is supposed to be a sphere of radius R, if g30 is value of acceleration due to gravity at latitude of 30o and g at the equator, the value of   g – g30°is        

(a)  ( 1/4 ) ω2R                          (b) (3/4)ω2R (c) ...

93. A solid sphere of mass 500 gm and radius 10 cm rolls without slipping with the velocity 20cm/s. The total kinetic energy of the sphere will be

(a)  0.014 J (b)  0.028 J                                            (c)   280 J (d)  140 J Ans. a (53)

Which of the following is not a semisynthetic polymer

a. cis- polyisoprene b. Cellulose nitrate c. Cellulose acetate d. Vulcanised rubber Ans. a (6)

Which of the following polymer is an example of fibre

a. Silk b. Dacron c. Nylon – 66 d. All of these Ans. d (12)

Which one of the following is a linear polymer

a. Amylopectin b. Glycogen c. Starch d. Amylose Ans. d (7)

Acceleration due to gravity ‘g’ for a body of mass ‘m’ on earth’s surface is proportional to (Radius of earth=R, mass of earth=M)

(a)        GM/R2                               (b)  m0 (c)   ...

Identify the heteropolymer from the list given below

a. Polythene b. Nylon – 6 c. Teflon d. Nylon -6, 6 Ans. d (9)

Three dimensional molecules with cross links are formed in the case of a

a. Thermoplastic b. Thermosetting plastic c. Both d. None Ans. b (7)

A body has a weight 90 kg on the earth’s surface, the mass of the moon is 1/9 that of the earth’s mass and its radius is 1/2 that of the earth’s radius. On the moon the weight of the body is

(a)      45 kg                               (b)  202.5 kg...

Cellulose acetate is a

a. Natural polymer b. Semisynthetic polymer c. Synthetic polymer d. Plasticiser Ans. b (4)

‘Cis- 1 , 4-polyisoprene’  is 

a. Thermoplastic b. Thermosetting plastic c. Elastic (rubber) d. Resin Ans. c (9)

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio

(a)      1 : 2                                 ...

Which one of the following is not a condensation polymer

a. Melamine b. Glyptal c. Dacron d. Neoprene Ans. d (9)

Example of condensation polymer is

a. Formaldehyde → meta- formaldehyde b. Acetaldehyde  →  para-aldehyde c. Acetone→   mesityl oxide d. Ethene → polyethene Ans. c...

If M the mass of the earth and R its radius, the ratio of the gravitational acceleration and the gravitational constant is

(a)    R2/M                                (b) M/R2 (c)    MR2                         ...

Which of the following is an example of condensation polymers

a.  Polythese b. PVC c. Orlon d. Terylene Ans. d (7)

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