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SCRA 2015- Paper 2 Key Phy + Chem

Download SCRA 2015 Paper 2(Physical Sciences) : click here

SET - D

1.   Consider 1 cm3 of air at absolute temperature T at sea level and other 1cm3 of air at a height where the pressure is one third atmosphere. The absolute temperature of the sample at that height is

      (a)                                                                  (b)    

      (e)                                                               (d)     Cannot be determined in terms of T from the above data

 

2.   The displacement of a particle with respect to mean position is represented by the equation . The motion is

      (a)     non-periodic

      (b)     periodic but not simple harmonic

      (c)     simple harmonic with time period

      (d)     simple harmonic with time period

 

 

3.   Which one of the following diagrams most closely shows the variation of kinetic energy (E) of the earth with time (t) as it orbits around the sun?

     

     

     

     

 

 

4.   Pressure is a scalar quantity because

      (a)     it is the ratio of force to area and both force and area are vector quantities

      (b)     it is the ratio of magnitude of force to area

      (c)     it is the ratio of component of the force normal to the area

      (d)     it depends on the size of the area chosen

 

 

5.   The volume of an ideal gas with adiabatic exponent  varies according to law  where a is a constant. If the temperature of gas increases by , then the amount of heat absorbed by the gas is

      (a)    

      (b)    

      (c)    

      (d)    

 

 

6.   If the coefficient of superficial expansion is x times the coefficient of cubical expansion then the value of x is

      (a)     2                                                             (b)     3/2

      (c)     2/3                                                          (d)     1/2

 

 

7.   Consider the following situations :

      1.      A charged particle moves in the direction of uniform magnetic field

      2.      A charged particle moves in the direction perpendicular to uniform magnetic field.

   3.      A charged particle moves in the direction making some angle with the direction of uniform magnetic field.

      In which of the above situations no work is done by the field on ·the particle

 

      (a)     1 and 2 only

      (b)     2 and 3 only

      (c)     1 and 3 only

      (d)     1, 2 and 3

 

 

8.   The resistance of the coil of an ammeter is R. The shunt required to increase its range N-fold should have resistance

      (a)    

      (b)    

      (c)    

      (d)    

 

9.   Two containers are at the same temperature T. The first contains gas at pressure P whose molecules have mass m1. The second contains molecules of mass m2 at pressure . The average speed of molecules of gas in second container is twice the root mean square speed of molecules of gas in the first container. What is the ratio of ?

      (a)     2

      (b)     1/2

      (c)     3/2

      (d)     6

 

 

10. A very small charged metallic ball is attached to a string and a person whirls it above his head so that it moves in a circle in a horizontal plane. Now a strong uniform magnetic field is switched on in a. direction perpendicular to the plane of motion of the ball. The tension in the string will

      (a)     decrease

      (b)     increase

      (c)     remain the same

      (d)     either inCte8SC or decrease.

 

 

SCRA 2015 Paper 2

1d

2c

3D

4C

5C

6C

7d

8b

9x

10 d

11.

What is the optical path of light my traversing the path POQ across two media of refractive indices  and  (PR = a, RS = b, RO = x, SQ = y)?

      (a)    

      (b)    

      (c)    

      (d)    

 

 

12. Consider the following lenses:

                                          

      Which of the above lenses do not exhibit dispersion?

      (a)                                                     (b)    

      (c)                                                                (d)     None

 

 

13. Consider the following statement in respect of quartz (SiO2):

      1.      The refractive index does not depend on the wavelength of visible light.

      2.      The refractive index is greater for violet light than for red light.

      3.      The refractive index decreases with increases in wavelength.

      Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     2 only

      (c)     3 only                                                     (d)     2 and 3

 

 

14. Consider the following figure. Let  and  be the change in internal energy in processes A and B respectively,  be the net heat given to the system in the process A + B and  be the net work done by the system in the process A + B.

      Which of the following are correct?

      1.     

      2.     

      3.     

      4.     

      Select the correct answer using the code given below:

  1. 1 and 3
  2. 1 and 4
  3. 2 and 3
  4. 2 and 4

 

 

15. Two small objects having same charge q are kept fixed on the z-axis at (0, 0, d) and (0, 0, -d) respectively. A charge Q moves along the x-axis. At what position of the charge Q would the force on Q be maximum?

      (a)                                                     (b)    

      (c)                                                  (d)    

 

 

16. Consider the following statements:

      1.      Paramagnetism occurs in materials where atoms have permanent dipole moments.

      2.      In diamagnetic materials, atoms having no permanent magnetic dipole moments acquire induced dipole moments when they are placed in an external magnetic field.

      3.      Ferromagnetism occurs in materials in which atoms have permanent magnetic dipole moments.

      Which of the above statements are correct?

      (a)     1 and 2 only                                           (b)     2 and 3 only

      (c)     1 and 3 only                                           (d)     1, 2 and 3

 

 

 

 

 

 

 

17.

Three rods X, Y, Z of same dimension having thermal conductivities 3K, 2K, K respectively are arranged as shown in the above figure. Their ends are at 100oC and 0oC respectively. What is the temperature of the junction?

      (a)     75oC                                                        (b)     72oC

      (c)     70oC                                                        (D)    65oC

 

 

18.

Consider the following in respect of above network:

      1.      The potential at B is 35 V.

      2.      The current in the section AB is thrice the current in the section BD.

      3.      The network draws a total power of 200 Watt.

Which of the above are correct?

      (a)     1 and 2 only                                           (b)     2 and 3 only

      (c)     1 and 3 only                                           (d)     1, 2 and 3

 

 

19. Consider the following statements:

      1.      A converging lens of focal length f is placed in front of and coaxially with a convex mirror of focal length F. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement. The separation between the lens and the mirror is .

      2.      A diverging lens of focal length f is placed in front of and coaxially with a concave mirror of focal length F. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement. The separation between the lens and the mirror is .

Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     2 only

      (c)     Both 1 and 2                                           (d)     Neither 1 and 2

 

 

20. When white light passes through a hollow prism, then

      (a)     there is neither dispersion nor deviation

      (b)     there is dispersion but no deviation

      (c)     there is deviation but no dispersion

      (d)     there is both dispersion and deviation

 

 

21. Consider the following parameters with regard to hydrogen like atoms:

      1.      Energy of the atom

      2.      Radius of electron orbit,

      3.      Spin of the electron

      Which of the above are same for all hydrogen-like atoms and ions in n = 1 state?

      (a)     1 only

      (b)     2 only

      (c)     3

      (d)     1and 2

 

 

22. A positively charged thin metal ring of radius R is fixed in the xy-plane, with its centre at the origin. A negatively charged particle is released from rest at the point P(0, 0, c) where c > 0. Consider the following statements:

      1.      The electric field at P due to the metallic ring is always directed towards origin.

      2.      The negatively charged particle is accelerated towards origin and undergoes periodic motion.

      Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     2 only

      (c)     Both 1 and 2                                           (d)     Neither 1 nor 2

 

 

23. Let E be the electric field intensity and V be the potential at a point. Consider the following statements:

      1.      If V = 0, then E must be zero.

      2.      If V  0, then E cannot be zero.

      3.      If E  0, then Y cannot be zero.

      Which one of the following is correct ?

      (a)     Statements 1 and 2 are correct

      (b)     Statements 2 and 3 are correct

      (c)     Statements 1 and 3 are correct

      (d)     None of the statements are correct

 

 

24. The positron of a particle as a function of time is given by . The shape of the trajectory of the particle will be

      (a)     Straight line

      (b)     Circle

      (c)     Parabola

      (d)     Ellipse

 

 

25.

A particle is moving with constant speed along a regular helical path as shown above. Which of the following statements are correct?

      1.      The magnitude of the acceleration is constant.

      2.      The velocity of particle is constant

      3.      The acceleration of the particle is constant

      4.      The direction of acceleration if constant

      Select the correct answer using the code given below:

      (a)     1 only                                                     (b)     2 and 3 only

      (c)     3 only                                                     (d)     1, 3 and 4

 

 

26. Consider two lenses  and . The lens  has focal length of 50 cm and the lens  has a focal length of 2 cm. The two are mounted on an optical bench along a common optical axis. Which one of the following distances between the two lenses results in a telescopic arrangement?

      (a)     26 cm

      (b)     52 cm

      (c)     102 cm

      (d)     48 cm

 

 

27. Two bar magnets are taken and the north pole of one is attached to the south pole of the other. According to the inverse square law if the distance between the poles is zero, the force between them should be infinite. However, this is not the case as the two bar magnets can be easily separated. This is because

      (a)     The force law is valid only for point magnetic charges or poles

      (b)     The force law is valid only for single poles whereas bar magnet has both north and south poles

      (c)     When the bar magnets are brought together the surfaces are demagnetised

      (d)     The poles of the bar magnet do not lie on the surface but inside the bar so that the distance between the poles is never zero.

 

 

28. Consider a gaseous mixture of oxygen and nitrogen kept in a cylinder at room temperature. As  compared to nitrogen molecules, the oxygen molecules will hit the wan of the cylinder

      (a)     with greater average kinetic energy

      (b)     with smaller average kinetic energy

      (c)     with smaller average speed

      (d)     with smaller average speed and smaller average kinetic energy

 

11d

12c

13d

14a

15a

16d

17c

18b

19c

20c

21c

22b

23d

24c

25a

26b

27d

28c

29. A ray of light travels from an optically denser medium to an optically rarer medium. The critical angle for the two media is C. What is the maximum possible angle of deviation of the ray?

      (a)                                                           (b)    

      (c)                                                        (d)    

 

 

30. A barometer is placed inside a closed stationary elevator and it 760 mm. The elevator starts moving with acceleration in the upward direction. The reading on the barometer will read

      (a)     760 mm                                                  (b)     greater than 760 mm

      (c)     less than 760 mm                                  (d)     will oscillate about 760 mm

 

 

For the next two (02) items that follow:

A motor boat of mass m moves along a lake with velocity . Assume that resistance of water is proportional to velocity of boat as  being the proportionality constant. At the moment , the engine of the boat is shut down.

 

31. The instantaneous velocity as a function of time t is proportional to

      (a)                                                               (b)    

      (c)                                                         (d)    

 

 

32. The total distance covered till it stops is

      (a)                                                               (b)    

      (c)                                                               (d)    

 

 

33. A ball is dropped from the top of a tower. The distance covered in the last one second is 0.36 times the height of the tower. What is the height of the tower? (g = 10 m/s2)

      (a)     125 m

      (b)     100m

      (c)     88 m

      (d)     64 m

 

 

34. A particle participating simuitaneously in two simple harmonic oscillations of same direction  and .What is the maximum velocity of the particle?

      (a)                                                         (b)    

      (c)                                                           (d)    

 

 

 

For the next two (02) items that follow:

      From a point  on a highway, one has to get by car is soon as possible to point  located in the field at a perpendicular distance  from the highway. The car moves in the field  times slower than on the highway. Take  so that if the speed of the car on the highway is , it is  in the field.

     

35. At what distance from point D, one must turn off the highway?

      (a)                                                                  (b)    

      (c)                                                            (d)    

 

 

36. What is 1he'diSbmcc covered by the car in the field during this process?

      (a)                                                            (b)    

      (c)                                                            (d)     None of the above

 

 

37. A particle of mass m is located in a uni-dimensional potential field where the potential energy of the particle is given by  where  and  are constants. The time period of a small oscillation that the particle performs about the equilibrium is given by

      (a)                                                      (b)    

      (c)                                                        (d)    

 

38. A ball when thrown upward from a tower with a given velocity takes time  to reach the ground. The same ball when thrown downward with same velocity from the tower takes time  to reach ground. If the ball is dropped freely from the same tower, the time taken to reach the ground will be

      (a)                                                         (b)    

      (c)                                                           (d)    

 

 

39. In a Vernier Callipers, there are 20 divisions on the vernier scale that are equal to 19 divisions on the main scale. What is the least count of the instrument? (one main scale division is 1 mm)

      (a)     0.01 cm                                                  (b)     0.05 cm

      (c)     0.005 cm                                                (d)     0.5 cm

 

 

40. A steel ball of mass  starts sinking with zero initial velocity in olive oil and experiences frictional force proportional to first power of velocity. If  is the constant of proportionality, then the instantaneous velocity of the ball will be

      (a)                                             (b)    

      (c)                                            (d)    

 

 

41. A vessel contains liquid of density  over another liquid of density  (where  is any number). A homogeneous sphere floats with  times (where n is any number) of its volume in liquid of density  and remaining portion in liquid of density . The density of the material of the sphere is

      (a)                                                   (b)    

      (c)                                                   (d)    

 

 

42. Two identical sonometer wires have a fundamental frequency of 400 Hz when kept under same tension. What fractional increase in the tension of one wire would cause an occurrence of 2 beats per second when both the wires vibrate together?

      (a)     1%                                                          (b)     2%

      (c)     3%                                                          (d)     4%

 

 

43. A tube of length  is filled completely with an incompressible liquid of mass  and closed at both ends. The tube is then rotated in horizontal plane about one of its ends with uniform angular velocity . The force exerted by the liquid at the other end is

      (a)                                                           (b)    

      (c)                                                             (d)    

 

 

44. A particle executes simple harmonic motion between  to . The time taken for it to go from to  is  and to go from  to  is . Which one of the following is correct?

      (a)    

      (b)    

      (c)    

      (d)    

 

 

45. What is the path difference between the waves  and ?

      (a)                                                                  (b)    

      (c)                                                                   (d)    

 

 

29a

30c

31b

32a

33a

34d

35b

36a

37a

38c

39c

40a

41b

42a

43c

44a

45c

46. Consider the following statements associated with X-ray spectrum:

      1.      Wavelength of  X-ray of aluminium is greater than that of silver.

      2.      Wavelength of  X-ray of silver is greater than that of gold.

      3.      Wavelength of  X-ray of silver is greater than  X-ray of silver.

      Which of the above statements are correct?

      (a)     1 and 2 only                                           (b)     2 and 3 only

      (c)     1 and 3 only                                           (d)     1, 2 and 3

 

 

47. The total energy of an electron in the second excited state of the4 hydrogen atom is about –1.5 eV. The kinetic energy and potential energy of the electron in this state are

      (a)     1.5 eV and –3.0 eV                                 (b)     – 1.5 eV and – 4.5 eV

      (c)     3.0 eV and – 4.5 eV                                (d)     –0.75 eV and –0.75 eV

 

 

 

 

48. The electric flux through a closed surface is zero. It means that

      (a)     no electric fields lines either leave or enter the surface

      (b)     there are no positive charges present inside the closed surface

      (c)     the algebraic sum of all the charges present inside the surface is zero.

      (d)     the enclosed surface is a region of uniform electric field.

 

 

49. In a watch glass, water is taken and it is kept in a non-uniform magnetic field. Water moves from strong field to weak field. The magnetic effect observed is

      (a)     antiferromagnetic                                 (b)     ferromagnetic

      (c)     diamagnetic                                           (d)     paramagnetic

 

 

50. Consider the following statements:

      1.      A neutrino is emitted during  decay.

      2.      Neutrinos have almost zero mass.

      3.      A neutrino is emitted during  decay.

      4.      It was necessary to postulate existence of neutrinos to account for the conservation of angular momentum during  decay and the energy distribution.

Which of the above statements is/are correct?

      (a)     1, 2 and 4 only                                       (b)     2, 3 and 4 only

      (c)     3 only                                                     (d)     1, 2, 3 and 4

 

 

51. Consider the following statements in respect of optical fibres:

      1.      The core has higher refractive index compared to that of cladding.

      2.      Velocity of light passing through the cladding is more than that through the core.

      Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     2 only

      (c)     Both 1 and 2                                           (d)     Neither 1 and 2

 

52. Which one of the following graphs represents the variation of . With  for an ideal gas at constant temperature?

                         

                           

 

 

53. liquid oxygen at 50 K is heated for a long time at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature (T) with time (t)?

                            

                           

 

54.

      An atom has energy levels as shown in the above figure and . The wavelengths of corresponding transitions are also shown. The relation among the wavelengths is

      (a)                                              (b)    

      (c)                                  (d)    

 

 

46d

47a

48c

49c

50b

51c

52a

53d

54b

55. One mole of gas of specific heat ratio 1.5 being initially at temperature 290 K is adiabatically compressed to increase its pressure 8 times. The temperature of the gas after composition will be

      (a)     580 K                                                      (b)     870 K

      (c)     290 K                                                 (d)     1160 K

 

 

56. When a nucleus in a radioactive atom undergoes radioactive de3cay, the electronic energy levels of the atom

      (a)     do not change for any tipe of radioactivity

      (b)     change for  and -decay processes but not for -decay process

      (c)     change for -decay process but not for  and -decay processes

      (d)     change for all types of radioactivity

 

 

57.

      In the above diagram, what is the refractivce index of material of the prism with respect to air, when the angle of deviation is ?

      (a)                                                               (b)    

      (c)                                                                   (d)    

 

 

58. If  and  are the distances of an object and its image from the focus of a spherical mirror of focal length , then what is  equal to?

      (a)     1                                                             (b)     1.5

      (c)     2                                                             (d)     4

 

 

 

 

 

 

 

59.

A long thin rectangular slab PQRS having refractive index  is immersed in a liquid having refrative index . A ray of light is incident at the edge PQ of the slab as shown. What is the sine of angle of incidence  such that the ray comes out from the slab as shown in the above figure?

      (a)                                                               (b)    

      (c)                                                                   (d)    

 

 

60.

      Three voltmeters X, Y, Z all having different resistences are joined as shown above. When some potential difference is applied across the terminals A and B, their readings are x, y, z respectively. Which of the following is/are correct?

      1.     

      2.     

      3.     

      Select the correct answer using the code given below:

      (a)     1 only                                                     (b)     2 only

      (c)     1 and 2                                                   (d)     3 only

 

 

61. The standard reduction potentials for the following reactions are:

       with

       with

      What would be the standard electrode potential for the reaction ?

      (a)     0.772 V                                                   (b)     0.077 V

      (c)     –0.404 V                                                 (d)     –0.772 V

 

 

62. The vapour pressure of pure liquid solvent A is 0.80 bar. When a non-volatile substance B is added to the solvent pressure drops to 0-60 bar. What is the mole fraction of component B in the solution?

      (a)     0.75                                                        (b)     0.50

      (c)     1.0                                                          (d)     0.25

 

 

63. Consider the following statements:

      Statement      :     Mass, volume and pressure are extensiveproperties.

      Statement     :     Extensive properties depend upon the amount of the substance.

      Which one of the following is correct in respect of the above statements?

      (a)     Both the statements are true and Statement is the correct explanation of Statement

      (b)     Both the statements are true but Statement is not the correct explanation of Statement

      (c)     Statement is true, but Statement is false

      (d)     Statement is false, but Statement is true

 

 

64. The enthalpy change of a reaction does ot depend on

      (a)     Initial and final state of the reaction

      (b)     State of the reactants and products

      (c)     Nature of the reactants

      (d)     Different intermediate states

 

 

65. Oxygen molecule is paramagnetic because

      (a)     Bonding electrons are more than anti-bonding electrons

      (b)     It contains two unpaired electron

      (c)     Anti-bonding electrons are more than bonding electrons

      (d)     bonding electrons are equal to anti-bonding electrons

 

 

66. ion always gets associated with other atoms or molecules due to

      (a)     its positive charge

      (b)     absence of any electron in its orbitals

      (c)     its resemblance with alkali metal cations

      (d)     small size so that it cannot exist free

67. Consider the following statements in respect of reactivity of hydrogen:

      1.      Hydrogen is not reactive under ambident conditions.

      2.      Hydrogen reacts with fluorine violencity.

      3.      Hydrogen and chlorine reaction is catalysed by daylight.

      4.      Hydrogen and nitrogen can react directly in presence of visible light.

      Which of the above statements are correct?

      (a)     1, 2, 3 and 4                                           (b)     1, 2 and 3 only

      (c)     2 and 3 only                                           (d)     1 and 4 only

 

 

68. How many hydrogen bonded water molecules are present in ?

      (a)     5                                                             (b)     4

      (c)     1                                                             (d)     0

 

 

69. A water sample contains 81 ppm of , 73 ppm of , 68 ppm of  and 60 ppm of . What is the hardness of the water sample? (Atomic weights of calcium, magnesium and sulphur are respectively 40, 24 and 32)

      (a)     50 ppm                                                   (b)     100 ppm

      (c)     150 ppm                                                 (d)     200 ppm

 

 

70. on electrolysis of brine solution, the amounts of NaOH  and Cl2 produced at cathode and anode respectively are

      (a)     40 parts and 35.5 parts

      (b)     35.5 parts and 40 parts

      (c)     100 parts and 80 parts

      (d)     80 parts and 100 parts

 

 

71. Consider the following chemical reaction of D2O:

      1.     

      2.     

      3.     

      Which of the above are exchange reactions?

      (a)     1 and 2 only                                           (b)     2 and 3 only

      (c)     1 and 3 only                                           (d)     1, 2 and 3

 

 

72. In the Solvay process of manufacture of sodium carbonate, the regeneration of ammonia occures by reaction of NH4Cl with Ca(OH)2. The by-product obtained in this process is

      (a)     CaCl2                                                      (b)     NaCl

      (c)     CaO                                                        (d)     NaHCO3

 

 

73. An improved combination of baking powder contains about 40% starch + 30% NaHCO3 + 20% NaAl(SO4)2 + 10% Ca(H2PO4)2.

      Consider the following for these constituents:

      1.      Starch acts as a filter.

      2.      Moistened Ca(H2PO4) is acidic and generates CO2 form NaHCO3.

      3.      NaAl(SO4)2 slows down the reaction of generation of CO2 from NaHCO3.

      Which of the above are correct?

 

 

74. Consider the following statements for MgSO4:

      1.      It crystallizes in a form with seven water molecules.

      2.      Aqueous solution of MgSO4 when treated with NaCl gives white precipitate.

      Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     2 only

      (c)     Both 1 and 2                                           (d)     Neither 1 nor 2

 

 

75. Consider the following for alumina

      1.      In crystalline form, it exists in  and  forms.

      2.       form is the strongest and is known as corundum.

      3.       form can be converted to  form by heating at C.

      Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     2 only

      (c)     1 and 2                                                   (d)     2 and 3

 

 

76. Compound A on ozonolysis yielded a mixture of propanoic acid and acetic acid. The structure of compound A is

      (a)    

      (b)    

      (c)    

      (d)    

 

 

77. Reaction of aqueous  with  gives

      (a)                                                           (b)    

      (c)                                                        (d)    

 

 

78. Consider the following reaction:

      The above reaction is an example of

      (a)     Free-radical reaction

      (b)     Nucleophilic substitution reaction

      (c)     Electrophilic sudstitution reaction

      (d)     Addition reaction

 

 

79. Consider the following compound:

      What is the IUPAC name for the above compound?

      (a)     2,2-Dimethyl-1-hydroxyl propane

      (b)     2-Methyl-2-hydroxymethy propane

      (c)     tert-butyl methanol

      (d)     2,2-Dimethylpropan-1-ol

 

 

80. Acetylation of salicylic acid yields

      (a)     Sulphadiazine                                         (b)     Aspirin

      (c)     Chloramphenicol                                   (d)     Streptomycin

 

 

81. Consider the following compounds:

     

     

     

What is the correct order of boiling point of the above?

      (a)                                                 (b)    

      (c)                                                 (d)    

 

 

55a

56a

57c

58b

59a

60c

61a

62d

63d

64d

65b

66d

67b

68c

69d

70a

71a

72a

73d

74a

75c

76b

77a

78a

79d

80b

81c

82. Which of the following halides will udergo hydrolysis in aqueous conditions at room temperature?

            

                                             

 

 

83. Which one of the following substances will react to give tert-butyl ethyl ether as the major reaction product?

      (a)     tert-butyl chloride + sodium ethoxide

      (b)     2-Methyl propene + ethanol + dil. HCl

      (c)     Ethane + tert-butanol

      (d)     Ethyl bromide + sodium tert-butoxide

 

 

84. Which set of reagents is likely to bring about the following reduction?

      (a)     Sn/HCl                                                    (b)     Zn/NH4Cl,

      (c)     Zn, NaOH, CH3OH                                  (d)     H2/Raney Ni

 

 

85. Consider the following acids

      What is the correct order of acidity?

      (a)                                                 (b)    

      (c)                                                 (d)    

 

 

86. Consider the following statements in respectg of cellulose:

      1.      Cellulose is a linear biopolymer.

      2.      Glucose units are joined by -glycogidic linkages.

      3.      Cooton and paper r

      Which of ther above statements is/are correct?

      (a)     1 only                                                     (b)     1 and 2

      (c)     2 only                                                     (d)     1 and 3

 

 

87. Consider the following molecules:

      1.      CH3NH2

      2.      CH3OH

      3.      CH3SH

      4.      CH3P(CH3)2

      Which one of the following bonds has the longest bond length in the above molecules?

      (a)     C-N                                                         (b)     C-O

      (c)     C-S                                                          (d)     C-P

 

 

88. Which one of the following compounds has asymmetric carbon in it?

 

      (a)     CH3CH2Br                                               (b)     CH3CH(Br)CH3

      (c)     CH3CH2(Br)CH3                                       (d)     CH3CH2CH(BR)CH2CH3

 

 

89. Presence of which one of the following groups in monosubstituted benzene ring will deactivate it and will have ortho and para directing influence on attacking electrophile?

      (a)                                                          (b)    

      (c)                                                       (d)    

 

 

90. Which one of the following species is not aromatic?

                                                         

                                                    

 

 

91. The number of radial nodes for 4p orbital is

      (a)     4                                                             (b)     3

      (c)     2                                                             (d)     1

 

 

92. Why is graphite used as a dry lubricant in machinary?

      (a)     Each carbon atom undergoes sp3 hybridization in graphite

      (b)     Graphite has layered structure and it cleaves easily between the layers and therefore it is very soft and slippery

      (c)     Graphite is a non-conductor of electricity

      (d)     Graphite has two sigma bonds and two pi bonds

 

 

 

93. Consider the following statements:

      Statement      :     Cesium is useful as electrodes in photoelectric cells.

      Statement     :     Light energy absorbed by cesium is sufficient to make an atom of cesium lose an electron.

      Which one of the following is correct in respect of the above statements?

      (a)     Both the statements are true and Statement is the correct explanation of statement.

      (b)     Both the statements are true and Statement is not the correct explanation of statement .

      (c)     Statement  is true, but Statement  is false

      (d)     Statement  is false, but Statement  is true

 

 

94. Consider the following statements:

      Statement      :     Red blood cells burst when placed in water.

      Statement     :     Water enters into blood cells due to osmosis.

      Which one of the following is correct in respect of the above statements?

      (a)     Both the statements are true and Statement is the correct explanation of statement.

      (b)     Both the statements are true and Statement is not the correct explanation of statement .

      (c)     Statement  is true, but Statement  is false

      (d)     Statement  is false, but Statement  is true

 

 

95. Which one of the following orbitals has the highestenergy?

      (a)                                                               (b)    

      (c)                                                                (d)    

 

 

96. The combustion of methane is written as

      The difference between enthalpy change and energy change is equal to

      (a)                                                          (b)    

      (c)                                                               (d)    

 

 

97. The boiling point of NH3is much higher than that of PH3 because

      (a)     NH3 undergoes umbrella inversion

      (b)     NH3 has larger molecular weight

      (c)     NH3 forms intermolecular hydrogen bonds

      (d)     NH3 contains ionic bonds whereas PH3 contains covalent bonds

 

 

98. Cosider the following statements with regard to chemical equlibria:

      1.      Equilibrium constant is independent of initial concentrations of reactants and products.

      2.      Equilibrium constant for the reverse reaction is equal to the inverse of the equilibrium constant for the forward reaction.

      3.      Equilibrium constant is independent of temperature.

      Which of the above statements are correct?

      (a)     1 and 2 only                                           (b)     2 and 3 only

      (c)     1 and 3 only                                           (d)     1, 2 and3

 

 

99. Consider the following statements in respect of lyophobic sols:

      1.      They are sols of inorganic substances like As2S3, Fe(OH)3 and plantinum.

      2.      These are reversible.

      3.      These are easily coagulated by addition of electrolytes.

      Which of the above statements is/are correct?

      (a)     1 only                                                     (b)     1 and 2

      (c)     1 and 3                                                   (d)     3 only

 

 

100.  consider the following reaction:

         In the above reaction,

         1.      Phosphorus is oxidised.

         2.      Phosphorus is reduced.

         Which of the above is/are correct?

         (a)     1 only                                                  (b)     2 only

         (c)     Both 1 and 2                                        (d)     Neither 1 nor 2

 

 

101.  Consider the nitrogen-oxygen bond length in  and . The increasing order of N-O bond length is

         (a)                                         (b)    

         (c)                                         (d)    

 

 

102.  Consider the follwing reaction

         Which one of the following statements is correct?

         (a)     The reaction must occure in a single step

         (b)     This is a second order reaction overall

         (c)     Raising the temperature will cause the value of k to decrease

         (d)     Raising the temperature lowers the activation energy for the reaction

 

 

103.        Consider the following statements:

      Statement      :     Phosphorus-32 decays to sulphur-32 with emission of a  particle.

      Statement     :     The neutron to proton ratio is less than 1.0for all light stable nuclides.

      Which one of the following is correct in respect of the above statements?

      (a)     Both the statements are true and Statement is the correct explanation of statement.

      (b)     Both the statements are true and Statement is not the correct explanation of statement .

      (c)     Statement  is true, but Statement  is false

      (d)     Statement  is false, but Statement  is true

 

 

104.  A first order reaction is one-fifth completed in 40 minutes. The time required for its 100% completion is

         (a)     100 minutes                                        (b)     200 minutes

         (c)     350 minutes                                        (d)     Infinity

 

 

105.        Consider the following statements:

      Statement      :     The conductancer depends on the number of ions and ion mobility. The equivalent conductance increases with increase in dilution, the specific conductance diminishes.

      Statement     :     The total number of ions increases on account of increased ionisation due to dilution, but the number of ions per unit volume decreases.

      Which one of the following is correct in respect of the above statements?

      (a)     Both the statements are true and Statement is the correct explanation of statement.

      (b)     Both the statements are true and Statement is not the correct explanation of statement .

      (c)     Statement  is true, but Statement  is false

      (d)     Statement  is false, but Statement  is true

 

 

106.  In which silicate, the the central metal has coordination number 6?

         (a)     Zn2[SiO4]                                              (b)     Be2[SiO4]

         (c)     Mg2[SiO4]                                            (d)     Zr[SiO4]

 

 

107.  In the manufacture of ammonia by Haber process high pressure is maintained because

         (a)     all reactants and products are gases

         (b)     reaction is exothermic

         (c)     the moles of the product are less than the moles of reactants

         (d)     reaction is a reversible reaction.

 

 

 

82b

83d

84b

85a

86d

87d

88c

89d

90a

91c

92b

93a

94a

95b

96a

97x

98a

99c

100c

101a

102b

103c

104d

105a

106c

107c

108.  HNO3 produced Ostwald’s method is 60% by weight. Concentrated HNO3 can be made by

         1.      distilation

         2.      dehydration with concentrated H2SO4

         3.      distilation after mixing with 72% Mg(NO3)2

         Which of the above are correct?

         (a)     1 only                                                  (b)     1, 2 and 3

         (c)     2 and 3 only                                        (d)     2 only

 

 

109.  Consider the following reaction:

        

         How many electrons are involved in the above redox reaction?

         (a)     9                                                          (b)     6

         (c)     3                                                          (d)     2

 

 

110.  Which oxy-acid of sulphur does not contain S-S bond?

         (a)     H2S2O5                                                 (b)     H2S2O4

         (c)     H2S2O7                                                 (d)     H2S2O6

 

 

111.  In the manufacture of fluorine by electrolysis of CaF2, some amount of KF is also added. The role of KF is to

         (a)     increase the yield of fluorine

         (b)     control rate of fluorine formation

         (c)     increase the conductivity of electrolyte

         (d)     catalyze fluorine formation

 

 

112.  0.222 g of iron ore was brought into solution. Fe3+ is reduces to Fe2+ with SnCl2. The reduced solution required 20 ml of 0.1 N KMnO4 solution. The percentage of iron present in the ore is (equivalent wieght of iron is 55.5)

         (a)     55.5%                                                  (b)     45.0%

         (c)     50.0%                                                  (d)     40.0%

 

 

113.  Consider the following statements:

         1.      In electrolytic  refining method impure metal acts as cathod and pure metal as anode

         2.      Zone refining method is used when impurities are more soluble in the melt than in the metal.

         Which of the above statement is/are correct?

         (a)     1 only                                                  (b)     2 only

         (c)     Both 1 and 2                                        (d)     Neither 1 nor 2

 

 

114.  In the extraction of aluminium by Hall-Heroultprocess, the compound which lowers the melting point of Al2O3 and improves its conductivity is

         (a)     Na3[AlF6]                                              (b)     AlF3

         (c)     NaF                                                      (d)     None of the above

 

 

115.  Copper, silver and gold tend to be unreactive. It is due to their

         (a)     high enthalpy of sublimation and low ionisation energy

         (b)     high enthalpy of sublimation and high ionisation energy

         (c)     d10 electronic configuration

         (d)     low enthalpy of sublimation and high ionisation energy

 

 

116.  Consider the following compound:

         Which is the number of stereoisomers possible for the above compound?

         (a)     2                                                          (b)     3

         (c)     4                                                          (d)     5

 

 

117.  n-butylchloride, sec-butylchloride, iso-butylechloride and tert-butylchloride are example of

         (a)     Conformers                                         (b)     Geometrical isomers

         (c)     Diastereomers                                    (d)     Structural isomers

 

 

118.  The reaction (–)-2-bromobutane with alcoholic KOH yields

         (a)     (+)-butan-2-ol                                      (b)     (–)-butan-2-ol

         (c)     2-butane                                              (d)     1-butane

 

 

119.  In the addition reaction of HBr to 1-butane, the first step involves the addition of

         (a)                                                           (b)    

         (c)                                                             (d)    

 

 

120.  Consider the following transformation:

         Which one of the following reagents is suitable for the above transformation?

         (a)                                (b)    

         (c)                                            (d)    

 

 

108c

109b

110c

111c

112c

113b

114a

115b

116c

117d

118c

119a

120c

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