AIEEE Model Question Bits 2013

Chemistry Atomic Structure Questions and Answers :

CHEMISTRY – CONCEPTUAL

SUB ATOMIC PARTICLES

1. The increasing order of specific charge of electron (e), proton (p), alpha particle () and neutron (n) is ?

                  1) e, p, n,                  2) n, p, e,                      3) n, , p, e                     4) n, p, , e

2. In which of the following species both Cation and Anion have same number of electrons ?

                  1) CaO                              2) KBr                               3) NaF                          4) MgS

3. The ratio between the number of neutrons present in and  atoms is ?

                 1) 3 : 8                            2) 2 : 5                               3) 3 : 7                            4) 1 : 1

4. The nitride ion in lithium nitride is composed of ?

            1) 7 protons+7 electrons   2) 10 protons+7 electrons  3) 7 protons+10 electrons   4) 10 protons+10- sdfsfsdffselectrons

5. The Z and A values of an element are 25 and 55. The number of electrons, protons and neutrons in its most sdfstable ion respectively are ?

                1) 25, 25, 30                        2) 23, 25, 30                         3) 22, 25, 30                      4) 20, 25, 309

6. Which of the following statement is correct ?

                   1) Sulphur atom, sulphide ion have same no. of electrons

                   2) Sulphur atom, sulphide ion have same electrons configuration.

                   3) Sulphur atom, sulphide ion have same no. of neutrons.

                   4) Sulphur atom, sulphide ion differ in their nuclear charges.

7. Among the following which is not isoelectronic with others ?

             1)                     2)                              3)                                       4)

8. The charge on the atom containing 17 protons, 18 neutrons and 18 electrons is ?

             1) -1                           2) -2                                  3) 0                                   4) +1

9. Which of the following is correct for cathode rays in discharge tube ?

             1) independent of the nature of the cathode                        2) independent of the nature of the gas

             3) is observed in presence of electric and magnetic field.   4) all the above

10. Magnitude of deflection of cathode rays in discharge tube is more when ?

           1) magnitude of charge of the particle is more    2) greater interaction with the electric magnetic field

           3) less mass of the particle                                     4) all the above

11. The  values of proton is ?

              1) less than  value of electron                     2) equal to  value of electron

              3) greater than  value of electron               4) all the above

12. The  - particles are ?

            1) high energy electrons                  2) positively charged hydrogen atoms

            3) nuclei of helium atoms                4) high energy radiation

13. The correct statement about proton is :  ?

               1) It is nucleus of deuterium                          2) It is an ionized hydrogen atom

               3) It is an ionized hydrogen molecule          4) It is an - particle

14. In Moseley’s equation  ?

           1) b depends on metal and a is independent of metal            2) both a and b are metal dependent

          3) both a and b are independent of metal                                4) a is metal dependent while b is not

15. The argument which favor’s the particular nature of cathode rays is : ?

         1) they produce fluorescence                    2) they travel through vacuum

          3) they get deflected by electric and magnetic fields  4) they cast shadows of objects present in their way

16. Which of the following pairs have identical values of e/m ?

               1) a Proton and neutron                             2) A proton and deuterium       

               3) Deuterium and an - particles             4) An electron and  - rays

17. From the discharge tube experiment it was concluded that : ?

               1) mass of proton is in fraction                 2) matter contains electrons

               3) nucleus contains positive charge          4) positive rays are heavier than protons  

18. The nature of anode rays depends upon ?

             1) Nature of gas filled in the discharge tube   2) Nature of electrode   3) Nature of metal    4) None of sdfsffffffsfthese

19. An oil drop has 6.39 X  charge. What will be the number of electrons in this drops ?

               1) 2                                  2) 4                                   3) 8                               4) 16

20. The e/m value i.e., specific charge for a cathode ray ?

            1) has the smallest value when the discharge tube is filled with H2.                2) is constant

            3) varies with the atomic number of gas in the discharge tube

            4) varies with the atomic number of an element forming the cathode ray.

21. The value of charge on the oil droplets experimentally observed were  and coulomb. afs The value of the electronic charge, indicated by these results is ?

                1)                  2)                    3)                  4)

22. When the speed of the electron increases, the specific charge ?

                 1) Decreases                 2) Increases                        3) Remains same                4) None   

23. An atom contains electrons, protons and neutrons. If the mass of each neutrons is halved, and each fsffselectron is doubled, then the atomic mass of  ?

                 1) Gets doubled                                              2) Approximately remain same      

                 3) Approximately get reduced by 5%           4) Approximately get reduced by 25%

24. Nucleons are ?

          1) only protons       2) only neutrons     3) both protons and neutrons   4) electrons, protons and neutrons

25. The wrong statement among the following is ?

         1) Nitrogen atom, nitride ion have same atomic number

         2) Aluminum atom and its ion have same mass number

         3) Iron atom, ferrous ion have same electron configuration

         4) Nuclear charge is same in both chlorine atom, chloride ion

26. Set of iso electronic ions among the following is ?

         1) , ,                2) , ,             3) , ,           4) , ,

27. One of the fundamental particles is missing in one of the isotopes. And the particle and isotope are adsfrespectively ?

            1) neutron, protium            2) neutron, tritium           3) proton, protium          4) electron, tritium

28. Which of the following contains more no of neutrons ?

            1)                          2)                           3)                          4)

29. Tritium atom contains ?

             1) 1e, 1p, 1n                 2) 1e, 1p, 2n                   3) 2p, 2e, 1n             4) 1e, 1p, 3n

30. The massive particle among the following is ?

             1) particle                  2) deuteron                    3) proton                 4) particle 

31. The  value of electron is ?

             1) 1.758820 X     2) 1.75882 X     3) 1.758802 X      4) 1.75882 X

32. Charge of electron is determined by ?

                 1) J.J. Thomson                     2) Millikan                        3) Crookes                    4) Chadwick

33. Neutrons are discovered by ?

                 1) J.J. Thomson                       2) Gold Stein                     3) Crookes                 4) Chadwick

34. Charge of one mole of alpha particle is ?

                 1) +2 units                               2) +1 units                         3) +2 faraday             4) +2 coulombs

35. The ratio of  of proton and - particle is ?

                1) 2 : 1                               2) 1 : 2                                   3) 1 : 1                              4) 1 : 3

36. The Ion that is iso electronic with carbon monoxide is ?

                1)                                  2)                                   3)                         4)

37. Which of the following statement is not correct regarding cathode rays ?

           1) The rays carry negative charge 

           2) The charge / mass of these rays is considerably smaller than for positive rays 

           3) The rays produce mechanical effect

           4) The charge / mass ratio is independent of the nature of the gass taken in the discharge tube

38. Which of the following is not basic postulate of Dalton’s atomic theory ?

            1) Atoms are neither created not destroyed in a chemical reaction

            2) In a compound, the relative number and kinds of atom are constant

            3) Atoms of all elements are alike, including their masses

            4) Each element is composed of extremely small particles called atoms

39. Which of the following reactions led to the discovery of neutrons ?

                1)               2)    

                 3)              4)

40. For the atomic radius of the order of cm and nuclear radius of the order of cm. The fraction of    afsatom occupied by the nucleus will be ?

          1) X atomic volume     2) X atomic volume   3) X atomic volume   4) X atomic volume

41. Which of the following is main cause of late discovery of neutron ?

                1) Neutron is highly unstable particle          2) Neutron in nucleus moves very fast

                3) Neutron is charge less particle                  4) All of these

42. Which statement is correct ?

                 1) Volume of proton is approximately 1.5 X  

                 2) The radius of electron is 42.8 X

                 3) The density of nucleus is

                 4) All of the above

43. If be the specific charge (e/m) of cathode rays and be that of positive ray then which is true ?

                 1)                        2)                             3)                           4) Either of these

44. Which of the following statement about the electron is incorrect ?

               1) It is a negatively charged particle.

               2) The mass of electron is equal to the mass of neutron.

               3) It is a basic constituent of all atoms.

               4)  It is constituent of cathode rays.

45. The specific charge for positive rays is much less than the specific charge for cathode rays. This is because ?

           1) Positive rays are positively charged           2) Charge on positive rays is less

           3) Positive rays comprise ioniosed atoms whose mass is much higher

           4) Experimental method for determination is wrong

46. Which is not true with respect to cathode rays ?

          1) A stream of electrons         2) Charged particles        3) Move with same speed as that of light                     afsffs4) Can be deflected by electric field.

47. Which of the following statement is not correct about the characteristics of cathode rays ?

               1) They start from the cathode and move towards the anode.

               2) They travel in straight line in the absence of an external electrical or magnetic field.

               3) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.

               4) Characteristics of cathode rays depends upon the nature of gas present in the cathode ray tube.

THOMSON AND RUTHERFORD ATOMIC MODELS

48. In Rutherford rays scattering experiment gold foils are used due to ?

              1) high maeliability                2) ductability               3) high melting point           4) high ionization energy

49. The best evidence that electrons are arranged in definite orbits or energy levels is based on the sadfobservation that ?

                  1) atomic spectra consist of discrete lines and not continuous bands.

                  2) electrons in the beta ray have high kinetic energy

                  3) the penetrating power of cathode ray electrons depends upon the voltage used to produce them

                  4) electrons revolve around the nucleus

50. Which of the following is true for Thomson’s model of atom ?

           1) The radius of an electron can be calculated by using this model

           2) In an undisturbed atom, the electron will be at their equilibrium position, where the attraction    afdfsffsfsbetween electron and cloud of positive charge

           3) The cloud of positive charge and the electrons balances their mutual repulsion.

           4) None of the above

51. In Rutherford’s alpha – ray scattering experiment, the alpha particles are detected using a screen coated     affswith ?

                1) carbon black                   2) platinum black              3) zinc sulphide              4) poly tetrafluoro ethylene

52. Rutherford’s experiment on scattering of particles showed for the first time that the atom has ?

                1) Nucleus                  2) Electron                    3) Proton                     4) Neutron

53. The conclusions of Rutherford scattering experiment does not include :  ?

               1) particle can come within a distance of the order of m of the nucleus.

               2) The radius of the nucleus is less than m

               3) Scattering follows Coulomb’s law

               4) The (+) vely charged particles of an atom move with extremely high velocities.

ISOBARS AND ISOTOPES

54. Among  and  the isobar combination is  ?

                1) A and B                        2) B and C                   3) C and D                  4) A and D

55. In  and , which of the following is false ?

                 1) Both have 17 protons                      2) Both have 17 electrons                                                                                                                   

                 3) Both have 18 neutrons                    4) Both show same chemical properties

56. Lightest isotope in the periodic table is ?

                 1) Tritium                        2) Deuterium                   3) Protium               4) All the above

57. The lightest radioactive isotope in periodic table is ?

                 1) Tritium                        2) Deuterium                  3) Protium               4) All the above

58. Isotopes exhibhits similar ?

                 1) Physical properties                      2) Chemical properties 

                 3) Physical and chemical                 4) neither physical nor chemical properties

59. Which of the following elements exhibits more number of stable isotopes ?

                1) H                                2) O                                   3) Sn                               4) S

60. Isobars differ in ?

                 1) Nucleons                 2) mass number             3) atomic number         4) both  1 and 3

61. The atomic weight of an element is 23 and its atomic number is 11. The number of protons, electrons and afdfneutrons respectively present in the atom of the element are : (E = 86)

               1)  11, 11, 12                 2) 12, 12, 11                   3) 11, 12, 11                  4) 12, 11, 12

62. The number of neutrons present in the deuterium isotope of hydrogen is ?

                1) 2                             2) 3                                 3) 5                              4) 1

63. Two atoms are said to be isobars if ?

                1) They have same atomic number but different mass number

                2) They have same number of electrons but different number of neutrons

                3) They have same number of neutrons but different number of electrons

                4) Sum of the number of protons and neutrons is same but the number of protons is different

ELECTROMAGNETIC RADIATION

64. The electromagnetic radiations are :   a) Visible light       b) IR light      c) UV light        d) Microwaves. The afsfcorrect order of increasing energy from lowest to highest is ?

                  1) a >  b > c > d                     2) a < b < c < d                      3) d < b < a < c                   4) b < c < d < a

65. Which of the following statements is not correct regarding electromagnetic spectrum  ?

                1) The velocity of X- rays is more than that of microwaves

                2) Infra – red radiations have larger wave length than cosmic rays

                3) The frequency of microwaves is less than that of ultra – violet rays

                4) X – rays have larger wave number than micro waves

66. Energy levels A, B, C of a certain atoms corresponding to increasing values of energy level  i.e., fsfsfsffsdffs fsff. If ,  and are the wavelengths of radiations corresponding to transitions C to B, B to A fsfsand C to A respectively which of the following statement is correct ?

                1)                       2)                        3)                  4)

67. The ratio of energy to frequency of electromagnetic radiation is called ?

                1) Bohr’s constant              2) Rydberg’s constant            3) Plank’s constant               4) Ritz constant

68. The radiation having maximum wave length is ?

                 1) Ultraviolet rays             2) Radio waves                         3) X – rays                          4) Infra – red rays

69. Which one of the following is having more wave number ?

                  1) Red                                2) Blue                                     3) Green                            4) Violet

70. The product of which of the following is equal to the velocity of light ?

                   1) wave length and wave number                 2) wave length and frequency  

                   3) frequency and wave number                      4) wave length and amplitude

71. The number of photons of light having wave number x in 1 J of energy source is (Plank’s constant = h,  afsfvelocity of light = c) ?

                    1)                                 2)                          3)                                4)

72. If  and are the wavelength of characteristic X- rays and gamma rays respectively, then the relation sdabetween them is ?

                    1)                         2)                           3)                           4)

PLANCK’S QUATUM THEORY

73. Dimensions of Planck’s constant are ?

                  1) Force X Time                     2) Energy X Distance                    3) Energy X Time                 4)

74. The characteristic not associated with Planck’s theory is : ?

                1) radiations are associated with energy    

                2) the magnitude of energy associated with a quantum is proportional to frequency

                3) radiation energy is neither emitted nor absorbed continuously

                4) radiation energy is neither emitted nor absorbed discontinuously

75. Planck’s constant has the same dimensions as that of ?

                 1) power                     2) work                      3) radiant energy              4) angular momentum

76. Which of the following relates to photons both as wave motion and as a stream of particles ?

                 1) interference           2)                   3) diffraction                  4)       

77. As the frequency of the light increases, the momentum of its Photon ?

                1) increases                   2) decreases                 3) remains same                  4) cannot be predicted

PHOTOELECTRIC EFFECT

78. The kinetic energy of the ejected electrons in photoelectric effect is ?

                1) Directly proportional to the frequency of the incident radiation

                2) Inversely proportional to the frequency of the incident radiation

                3) Not related to the frequency of the incident radiation

                4) All the above

79. Photo electric emission is observed from a surface for frequencies  and  the KE in two cases are in   dsfs ratio 1 : K, then the threshold frequency  is given by ?

               1)                  2)                3)                4)  

80. Light of certain wavelength strikes on a metal surface with intensity x and the metal emits y electrons per  afs second of average energy, z. What will happen to y and z if x is doubled ?

              1) y will be doubled and z will become half        2) y will remain same and z will be doubled

              3) both y and z will be doubled                             4) y will be doubled but z will remain same

81. The kinetic energy of electrons ejected by using light having frequency equal to threshold frequency() is:

              1)                                 2) Almost zero                      3) very large                          4)

82. Visible light photons do not show Compton effect because they ?

             1) Move very slowly        2) Have no momentum      3) Have very less mass       4) Have larger wavelength

83. Photoelectric effect of the phenomenon in which ?

              1) Photon comes out of a metal when it is hit by a beam of electrons

              2) Photons comes out of the nucleus of an atomic under the action of an electric field

             3) Electros come out of a metal with a constant velocity which depends on the frequency and intensity             fasfs fsfs of incident light we have

            4) Electrons come out of metal with different velocities not greater than a certain value which depends    fsfjsffaf   only on the frequency of the incident light wave and not on its intensity

84. In the equation ,  is known as  ?

               1) work function     2) velocity of ejected electron       3) threshold frequency     4) frequency of photon

85. Photo electric effected is not observed in case of  ?

               1) Potassium                2) Rubidium              3) Magnesium              4) Cesium

86. If  is the threshold wavelength for photoelectric emission,  the wavelength of light falling on the surface of a metal and m is the mass of the electron, then the velocity of ejected electron is given by ?

               1)              2)              3)                 4)

87. The photoelectric emission from a surface starts only when the light incident upon the surface has certain afsffminimum ?

                1) intensity                           2) wavelength                          3) frequency                             4) velocity

88. The threshold frequency for photoelectric emission of electron from platinum is . Then          fasfincorrect statement is ?

              1) The number of electrons ejected from the metal surface will depends upon the intensity

             2) The radiation having energy will be able to cause photoelectric effect.

             3) If radiation having frequency strikes the platinum surface, photoelectric will not be afsdfsfsfa ejected.

             4) The kinetic energy of the emitted electrons will increase with increase in frequency provided it is fsdfsafsffsgreaterfthan .

89. In photoelectric effect the number of photo-electric emitted is proportional to ?

                  1) intensity of incident beam                                         2) frequency of incident beam                                                                                                                                     

                  3) wavelength of incident beam                                     4) All the above

90. Light of wave length  strikes a metal surface with intensity X and the metal emits  electrons per second of average energy Z . If X is halved, the  and Z will be : ?

                 1)  will be halved, Z will be doubled                  2)  will be doubled, Z will be halved

                 3)  will be halved and Z will be remain same   4)  will remain the same and Z will be halved

91. A surface ejected electrons when hit by green light but not when hit by yellow light. Will electrons be fsdfejected if the surface is hit by red light ?

           1) Yes      2) NO     3) Yes, if the red bream is quite intense     4) Yes, if the red beam continues to fall upon

AUTOMIC SPECTRA

92. Which of following transitions are not allowed in the normal electronic emission spectrum of an atom ?

            1)                        2)                      3)                       4)

93. The spectrum with all wavelengths may be ?

           1) absorption spectrum     2) emission spectrum   3) continuous spectrum   4) discontinuous spectrum

94. Line spectrum is characteristic of  ?

            1) atoms           2) molecules    3) any substance in the solid state         4) any substance in the liquid state

95. All types of electromagnetic radiations possess same ?

             1) wave length             2) Frequency            3) Energy           4) Velocity when they passed through vacuum

96. The band spectrum is caused by ?

               1) molecules               2) atoms         3) any substance in solid state         4) any substance in liquid state

97. The line spectra of two elements are not identical because : ?

            1) the elements do not have the same number of neutrons              2) they have different mass numbers  

            3) their outermost electrons are at different energy levels                4) all of the above

HYDROGEN SPECTRUM

98.  In hydrogen atom electron is present in the N shell. If it loses energy, a spectral line may be observed in the region ?

                    1) infra – red                     2) visible                   3) ultra – violet                    4) any of these

99. When the electron of 5^th orbit jumps into the first orbit. The number of spectral lines produced in hydrogen spectrum is ?

                     1) 5                              2) 10                               3) 20                      4) 1

100. The electron present in 5^th orbit in excited hydrogen atoms returned back to ground state. The no. of lines which appear in Lyman series of hydrogen spectrum ?

                     1) 5                             2) 10                               3) 4                         4) 6

101. The electronic transition that emits maximum energy is [ n = represents ] ?

                    1)                 2)                     3)                  4)

102. The wave number of the - Line in Balmer series of hydrogen spectrum is ?

                    1)                  2)                   3)                 4)

103. If the mass of the electron is reduced to half the Rydberg constant ?

                    1) remains unchanged          2) becomes half         3) becomes double       4) becomes one fourth

104. Rydberg constant is ?

                    1) Same for all elements            2) Different for different elements                                      afsdfsfsffsff3) A universal constant              4) Is different forflighter elements but same for heavier elements

105. Values of  and  for  spectral line in the hydrogen emission spectrum ?

                1) 1 and 2                       2) 2 and 3                       3) 3 and 2                    4) 2 and 4  

106. Which of the following gives neither emission spectrum nor absorption spectrum ?

               1)                                2)                               3)                              4)

107. In hydrogen spectrum, the spectral line of Balmer series having lowest wavelength is ?

              1)  Line                  2)  Line                  3) Line                 4)  Line

108. The following electronic transition corresponds to the shortest wave length ( n = no. of orbit ) ?

              1)                     2)                          3)                      4)

109. In hydrogen spectrum the following series of lines belongs to U.V.region ?

             1) Balmer series              2) Paschen series               3) Bracket series            4) Lyman series

110. When the electron jumps from n=5 to n=2 level. The spectral line observed in the hydrogen spectrum belongs to ?

            1) Balmer series               2) Lyman series                  3) Bracket series            4) Pfund series

111. Normal hydrogen atoms can not give ?

           1) absorption spectrum      2) line spectrum           3) band spectrum            4) atomic spectrum

112. Which of the following transition is associated with coloured spectral line ?

           1) n = 5 , to  n = 3              2) n = 4 , to  n = 2             3) n = 2 , to  n = 1              4) n = 3 , to  n = 1

113. The wave length of the radiation emitted by Hydrogen when compared to  is ?

           1) 2 times that of  ion      2) 3 times that of  ion      3) 4 times that of  ion    4) Same as

114. Among the first lins Lyman, Balmer, Paschen and Brackett series in hydrogen atomic spectra which has       higher energy ?

                1) Lyman                 2) Balmer                     3) Paschen                    4) Brackett

115. The hydrogen spectrum from an incandescent source of hydrogen is : ?

                   1) A band spectrum in emission                     2) A line spectrum in emission 

                  3) A band spectrum in absorption                  4) A line spectrum in absorption

116. The hydrogen line spectrum provides evidence for the ?

                  1) Heisenberg uncertainly principle     2) Wave-like properties of light 

                  3) Diatomic nature of                       4) Quantized nature of atomic energy states.

BOHRS ATOMIC MODEL

117. For the electron moving in the circular orbit in the hydrogen atom, the forces of attraction of the nucleus faffsfis balanced by the force equal to ?

                  1)                   2)                    3)                 4)  

118. The ratio between potential energy and total energy of an electron in H – atom according to Bohr atom ?

                  1) 1 : -1                      2) 1 : 1                        3) 1 : 2                 4) 2 : 1

119. The ratio of the radius of the Bohr orbit for the electron orbiting the hydrogen nucleus that of the afsdfelectron orbiting the deuterium nucleus is approximately ?

                  1) 1                             2) 1 : 2                        3) 2 : 1                 4) 1 : 4

120. The change in velocity when hydrogen electron jumps from K shell to L shell is ?

                  1) one-half of its original velocity                    2) twice to its original velocity  

                  3) one-quarter of its original velocity              4) equal to its original velocity

121. In a collection of H- atoms, all the electrons jump from n = 5 to ground level finally (directly or indirectly), afsafwithout emitting any line in Balmer series. The number of possible different radiations is ?

                  1) 10                          2) 8                        3) 7                         4) 6

122. Which of the following statements is incorrect ?

                 1) The third shell can hold a max. of 18 electrons.   

         2)  An electrons falling to the same energy level from any higher level always emits the same quantum of energy.

                 3)  In Balmer series, spectral lines appear in the visible part of the emission spectrum.

                 4) The hydrogen atom is in its ground state when its electrons in the first shell.

123. According to do Broglie’s concept, the circumference of each electron of which must be equal to ?

                      1) diameter of a electron                                       2) the wave length of an electron  

                      3) the integral no. of electron wave length        4) Planck’s constant divided by 2

124. Consider the following statements :

         I ) Bohr’s theory can also be used to explain the spectra of ion

         II ) Energy of an electron in the first Bohr orbit of hydrogen atom is  - 13.6 eV

         III ) Bohr’s theory is only applicable to hydrogen atom and not to any other species

         IV ) The energy of an electron in a hydrogen atom is quantized.  The correct statements are :

                       1) I, II, IV                             2) II, III                                       3) II, IV                                 4) All are

125. The expression for the Bohr radius of hydrogen – like species is ?

              1)       2)     3)          4)

126. The ionization energy of H atom is x k J. The energy required for the electron to jump from n = 2 to n = 3                                                                                     sdfsffwill be : ?

                1) 5x                           2) 36x / 5                      3) 5x / 36                       4) 9x / 4

127. Choose the incorrect relation on the basis of Bohr’s theory ?

                            1) Velocity of electron                                     2) Frequency of revolution   

                               3) Radius of orbit                                    4) Force on electron  

128. As an electron is brought from an infinite distance close of nucleus of the atom, the energy of electron ?

                            1) increases to a grater +ve value                          2) decreases to a smaller + ve value

                            3) increases to a grater –ve value                          4) decreases to a smaller  -ve value

129. If is the Rydberg constant, then the energy of an electron in the ground state of Hydrogen atom is ?

                          1) C                        2)                            3)                                    4)

130.  value is maximum in ?

                         1)                  2)                3)          4)

131. Energy difference between two adjacent orbits is minimum if they are ?

                        1) K, L – Shells                  2) L, M  – Shells              3) M, N – Shells              4) N, O – Shells

132. Bohr’s model of atom can explain the spectrum of all except  ?

                      1)                             2)                            3)                              4)

133. Transition of electron from M- Shells to K – Shells results in the emission of ?

                     1) Cosmic rays            2) Infrared rays            3) ultraviolet rays         4) X – rays

134. Which of the following electron transition in hydrogen atom will require the energy equivalent to its sdfsffionization energy ?

                    1) from n=1 to n=2        2) from n=2 to n=3        3) from n=1 to n=3               4) from n=1 to n= 

135. Which of the following is correct ?

            1) Potential energy of revolving electron =    2) Kinetic energy revolving electron  = 

            3) Total energy of revolving electron =            4) All the above

136. When a hydrogen atom is raised from the ground state to an excited state ?

                1) Both kinetic energy and potential energy decrease

                2) Potential energy increases and kinetic energy decrease

                3) Potential energy decreases and kinetic energy increases

                4) Both kinetic energy and Potential energy increases

137. The minimum energy required to eject an electron from an atom is called ?

               1) Kinetic energy               2) Electrical energy           3) Chemical energy            4) Work function                         

138. The radius of an orbit in hydrogen atom is equal to ?

                1)             2)                        3)           4)  

139. The angular momentum of the electron in the M- shell of H- atom is ?

                1)                           2)                             3)                                4)  

140. The total energy of the electron in any orbit of one electron containing species is given by the expression?

                 1)                        2)           3)         4)  

141. The potential energy of electron, revolving in an orbit of radius ‘r’ in the with atomic number Z is ?

                 1)                  2)                   3)                   4)  

142. The value of the total energy of an electron in the hydrogen atom is given by ?

                  1)                     2)                       3)                       4)  

143. The angular momentum of an electron in an atom depends on ?

                 1) m                       2) l                               3) n                           4) all the three

144. Properties of electrons that are quantized in Bohr’s atomic model are ?

               1) mass and energy                                2) energy and angular momentum                                                            f safsafff3) angular momentum and mass        4) mass and charge 

145. When the atomic electron is at infinite distance from the nucleus, its energy is  ?

                1) infinity                     2) zero                      3) negative                 4) positive

146. The total energy of the electron revolving round the nucleus is ?

                 1) zero      2) less than zero       3) More than zero      4) in some atoms less than zero and in certain -  fsadfsfsfsffsatoms more than zero  

147. Bohr’s model violates the rules of classical physics because it assumes that  ?

                   1) all electrons have same charge                            2) the nucleus have same charge                                                  fjfjfsfsfffssf3) electrons can revolve around the nucleus        4) A charged particle can accelerate without - sfsafsfsfssffsdemitting radiant energy

148. The different in angular momentum associated with the electron in two successive orbits of hydrogen ahddatom is ?

                    1)                      2)                       3)                      4)   

149. Angular momentum of an electron is quantum according to ?

                     1) Planck                   2) Rutherford           3) Bohr                    4) Thomson

150. Bohr’s model of atom explain ?

                     1) Zeeman effect     2) Photo electric effect   3) Stark effect    4) Hydrogen atomic spectrum atomic-  fafsfsfsssfffsfsahydrogen

151. Bohr’s model of an atom is contradicted by  ?

                      1) Pauli’s exclusive principle  2) Planck’s quantum theory  3) Heisenberg’s uncertainly principle      fasfsdfsfsdfs4) all the above

152. The basic assumption of Bohr Model of hydrogen atom is that  (E- 94)  ?

                     1) The energy of the electron is quantized                                                                                                                    jkvjfssfsadsf2) The angular momentum of the electron of the electron is quantized                                                                      asfsafsfsf    3) The radial distance of the electron is quantized                                                                                                         afsdfsfsfsffs4) The orbital velocity of the electron is quantized

153. According to Bohr’s theory energy is  …………………….. when an electron moves from a lower to a higher afsjf orbit ?

                     1) Absorbed            2) emitted                3) No change               4) both 1 and 2

154. To which of the following is Bohr’s theory applicable,     I)      II )        III) Tritium      IV)                                        affjsf The correct  combination is ?

                      1) III, IV                  2) I, II, III, IV               3) I, II                            4) I, II, III

155. The expression of Rydberg constant is ?

                 1)          2)            3)              4)

156. The wave length of a spectral line for an electronic transition is inversely related to ?

                 1) velocity of electron undergoing transition                    2) number of electron undergoing transaction

                 3) the different in energy levels involved in the transition          4) none of these

157. The potential energy of an electron present in the ground state of   ion is : ?

                1)                   2)                         3)                       4)

158. The velocity of electron in first orbit of H – atom as compared to the velocity of light is : ?

                 1)                         2)                          3)                        4)  same

159. When greater number of excited hydrogen atoms reach the ground state, then  ?

                1) more number of lines are found in Lyman series

                2) the intensity of lines in Balmer series increase

                3) the intensity of lines in Lyman series increase

                4) both the intensity and number of lines Lyman series increases

160. Which of the following is responsible to rule out the existence of definite paths or trajectories or                                                    2)      electrons ?

                1) Pauli’s exclusion principle.                                2) Heisenberg’s uncertainty principle.    

                3) Hund’s rule of maximum multiplicity              4) Aufbau principle.

161. Orbital motion of an electron is associated with ?

                 1)  kinetic as well as potential energy               2) only kinetic energy                

                 3) on potential energy                                         4) No energy

DE BROGILE’S HYPOTHESIS, HEISENBERG’S UNCERTAINITY PRINCIPLE

162. Among the following particles, which will have the shortest wavelength when accelerated by one million ddsdeV ?

                 1) Neutron                2) Tritium atom              3) particle         4) Electron

163. If moving with equal speeds, the longest wavelength of the following matter waves is that for a (an) ?

                1) Electron                 2) particle                3) Proton                4) Neutron

164. If and represents the kinetic energies of an electron alpha particle and a proton respectively, adfffeach moving with same deBroglie wavelength then :

                 1)           2)              3)         4)

165. An electron, a proton and alpha particle have K.E. of 16E, 4E and E respectively. What is the qualitative adffforder of their deBroglie wavelengths :

                1)            2)              3)                4)