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May 19, 2022

Home2022May19Page 6

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)

Which one of the following is not a condensation polymer

a. Nylon 66 b. Nylon 6 c. Dacron d. Buna – S Ans. d (18)

Perlon is

a. Rubber b. Nylon – 6 c. Terylene d. Orlon Ans. b (12)

80. The earth E moves in an elliptical orbit with the sun S at one of the foci as shown in the figure. Its speed of motion will be maximum at the point

  (a)      C (b)      A (c)      B (d)      D Ans. b (9)

At what depth below the surface of the earth, acceleration due to gravity g will be half its value 1600 km above the surface of the earth

(a)    4.2 ×106 m                               (b) ...

Which of the following is not an example of addition polymer

a. Terylene b. Polypropylene c. Polyethylene d. Polystyrene Ans. a (10)

Two planets of radii in the ratio 2 : 3 are made from the material of density in the ratio 3 : 2. Then the ratio of acceleration due to gravity  g1/g2  at the surface of the two planets will be

(a)      1                                     (b) ...

Which polymers occur naturally

a. Starch and Nylon b. Starch and Cellulose c. Proteins and Nylon d. Proteins and PVC Ans. b (10)

Which one is classified as a condensation polymer

a. Dacron b. Neoprene c. Teflon d. Acrylonitrile Ans. a (8)

Which of the following is not correct regarding terylene

a. Step-growth polymer b. Synthetic fibre c. Condensation polymer d. It is also called decron e. Thermosetting plastic Ans. e...

⌈NH (CH 2  ) NHCO (CH 2 ) 4  CO ⌉ n is a 

⌈NH (CH 2  ) NHCO (CH 2 ) 4  CO ⌉ n is a a. Thermosetting polymer b. Homopolymer c. Copolyer d.  Addition polymer Ans. c (14)

The condensation polymer among the following is

a. Protein b. PVC c. Polythene d. Rubber Ans. a (11)

Which of the following is not a synthetic polymer

a. Polyethylene b. PVC c. Nylon d. Cellophane Ans. d (9)

If the density of a small planet is the same as that of earth, while the radius of the planet is 0.2 times that of the earth, the gravitational acceleration on the surface of that planet is

(a)      0.2 g                                           (b)  0.4 g (c)   2 g                       ...

A body weight 500 N on the surface of the earth. How much would it weigh half way below the surface of the earth

(a)      125 N                              (b)  250 N...
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