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1. Which of the experiments convinces about the divisibility of atoms?

(i) Radioactivity

(ii) X-rays

(iii) Spectroscopic studies

(iv) All of the above


2. Which light is emitted by a fluorescent material?

(i) UV

(ii) Visible

(iii) IR

(iv) X- Rays


3. Cathode rays emitted from cathode are

(i) Cananl rays

(ii) Protons

(iii) Electrons

(iv) Positrons


4. Charge to muss ratio (el m) of the electron is determined by

(i) R .A. Millikan

(ii) J.J Thompson

(iii) G.J. Stoney

(iv) None of these


7. Alpha particles are

(i) Neutrons

(ii) Protons

(iii) Electrons

(iv) Helium nuclei


8. The beam attracted towards the negatively charged plate are

(i) Alpha particles

(ii) Neutrons

(iii) Beta particles

(iv) Gamma particles


9. Which rays are not deflected by electric and magnetic field?

(i) Alpha

(ii) Beta

(iii) Gamma

(iv) None of these


10. Which rays carry no charged and non- material in nature?

(i) Alpha

(ii) Beta

(iii) Gamma

(iv) None of these


11. Neutron was discovered by

(i) Moseley

(ii) Milliken

(iii) Chadwick



12. The phenomena of the emission of radiation from nuclei of lighter atoms due to bombardment of moving particles is known as

(i) Fission

(ii) Fusion

(iii) Artificial radioactivity

(iv) None of these

13. When high energy electrons collide with the anode, a very penetrating kind of radiation is produced roentgen called them

(i) Alpha – rays

(ii) Beta – rays

(iii) Gamma- rays

(iv) X- rays


14. Neutron possesses

(i) Positive charge

(ii) Negative charge

(iii) No charge

(iv) None of these


15. Rutherford bombarded by a number of electrons equal to the number of

(i) Beta particles

(ii) Neutron

(iii) Alpha particles

(iv) Electron


16 The nucleus is surrounded by a number of electrons equal to the number of

(i) Neutron

(ii) Proton

(iii) Negatron

(iv) Positron


17. According to rutherford’s model, the nucleus is surrounded by

(i) Proton

(ii) Neutron

(iii) Positron

(iv) Electron


18. Nucleus was discovered by

(i) Schrodinger

(ii) Chadwick

(iii) Bohr



19. The spectrum of incandescent gas is

(i) Absorption

(ii) Emission

(iii) Line

(iv) Continuous


20. The number of waves passing through a point in one second is called

(i) Wave number

(ii) Velocity

(iii) Frequency

(v) Wavelength


21. The distance between two successive crests in one or through is called

(i) Velocity

(ii) Frequency

(iii) Wavelength

(iv) Intensity


22. When a substance that has absorbed energy emits it in the form of radiation. The spectrum is

(i) Absorption spectrum

(ii) Emission spectrum

(iii) Line spectrum

(iv) Continuous spectrum


23. The quantum number which describes the shape of the orbital is

(i) Principle quantum number

(ii) Spin quantum number

(iii) Azimuthal quantum number

(iv) Magnetic quantum number


24. The quantum number which describe the orientation of the orbital is

(i) Spin quantum number

(ii) Principle quantum number

(iii) Azimuthal quantum number

(iv) Magnetic quantum number


25. In a spectrum of light shortest and longest wave length respectively are:

(i) Violet and red

(ii) Blue and red

(iii) Red and blue

(iv) Violet and indigo


25. Hydrogen atomic spectra are obtained by:

(i) De- excitation of a higher energy state

(ii) Emission of a gamma ray from the nucleus

(iii) Absorption of energy by ground state

(iv) Absorption of a an electron by the nucleus


26. Radioactivity Is due to:

(i) Stable electronic configuration

(ii) Stable nucleus

(iii) Unstable electronic configuration

(iv) Unstable nucleus


27. Emission of B particles from an element shows its:

(i) Atomic mass increase by 1

(ii) Atomic mass decrease by 1

(iii) Atomic charge increase by 1

(iv) Atomic charge decrease by 1


28. The orbital which has spherical shape is called

(i) s – orbital

(ii) p – orbital

(iii) d – orbital

(iv) f – orbital


29. When the electron jumps from third, fourth, fifth, orbits to the second orbit, the transitions are known as

(i) Paschen

(ii) P fund

(iii) Balmer

(iv) Brackett series


30. When the electron jumps from second ,third , fourth, orbits to the first orbit, the transitions are known as

(i) Balmer series

(ii) Lyman series

(iii) P fund series

(iv) Brackett series

31. Paschen, p fund and bracket series are found in

(i) UV region

(ii) Visible region

(iii) IR region

(iv) None of these


32. Bohr’s theory satisfactorily explains

(i) Stability of atom

(ii) Ionization energy

(iii) Spectra of hydrogen

(iv) All of the above


33. The first important discovery about the nature of cathode rays made by

(i) J. Perrin

(ii) De- Broglic

(iii) Crooks

(iv) Hittorf


34. Cathode rays possess

(i) Negative charge

(ii) Positive charge

(iii) Neutral

(iv) None of these


35. Canal rays are

(i) Negative rays

(ii) Positive rays

(iii) Neutral

(iv) None of these


36 The wavelength of green light in the range of

(i) 510-580 nm

(ii) 400-450 nm

(iii) 300-400 nm

(iv) 600-700 nm


37 .When spectrum of hydrogen is taken in the magnetic field, some new lines are created.

(i) n = 2

(ii) n = 4

(iii) n = 8

(iv) None of these


38. Quantum mechanical model of atom develop on the basis of Schrodinger equation helps to calculate

(i) Bond energy

(ii) Bond length

(iii) Shapes of molecules

(iv) All of the above


39 if the value of 1 = 0 me orbital is

(i) s

(ii) p

(iii) d

(iv) 2


40 The maximum number of electrons in d-orbital is

(i) 6

(ii) 8

(iii) 12

(iv) 10


41 The electrons are put in energy sub- levels in the order of increasing energy values. This is a statement of

(i) Hund’s rule

(ii) Aufbau principle

(iii) Pauli exclusion principle

(iv) Phase rule


42 Which of the following has highest electro-negativity?

(i) Cl

(ii) N

(iii) F

(iv) O


43. The measure of the ability of an atom to attract an electron pair to it self in a chemical bond is called

(i) Ionization energy

(ii) Electron affinity

(iii) Electro negativity

(iv) None of these


44. When the orbital of same energy are available to electrons, they will live in the separate orbital. This is a statement of

(i) Hund‘s rule

(ii) Aufbau principle

(iii) Pauli exclusion principle

(iv) Phase rule


45 The maximum number of electrons in orbital is

(i) 2

(ii) 4

(iii) 6

(iv) 8


46. The value of spin quantum number is

(i) +1/2

(ii) – 1/2

(iii) +1/2 or -12

(iv) +2


47. Electron behave like

(i) Waves

(ii) Particle

(iii) Wave and particle

(iv) None of these


48. f-orbital has maximum number of electrons

(i) 10

(ii) 6

(iii) 2

(iv) 14


49. Natural radioactivity is shown by elements which have atomic number

(i) 70

(ii) More than 80

(iii) X- rays

(iv) None of these


50. Which orbital has the lowest energy?

(i) 3d

(ii) 4s

(iii) Sp

(iv) 4f


51. Which ion has greater size?

(i) Cl-

(ii) l

(iii) F-

(iv) Br-


52. Sl unit of wave length is V

(i) Meter cube

(ii) Meter

(iii) Meter square

(iv) Per metre


53. lf the electro negativity difference between atoms is more than 1.7, the bond is

(i) Ionic

(ii) Covalent

(iii) Coordinate

(iv) Metallic

54 The maximum number of electrons in d- orbital is

(i) 4

(ii) 10

(iii) 4

(iv) C


55. Electro negativity depends on

(i) Atomic size

(ii) Atomic numbers

(iii) Atomic volume

(iv) All of the above


56. A covalent bond is formed when E.N values difference is

(i) Greater than 1.7

(ii) Equal to 1.7

(iii) Less than 1.7

(iv) None of these


57 Which element has higher electron affinity value?

(i) He

(ii) Ne

(iii) Ar

(iv ) Kr


58. Ionization energy depends on

(i) Magnitude of nuclear charge

(ii) Atomic radius

(iii) Shielding effect

(iv) All of the above


59. Which elements has high first ionization energy value?

(i) Li

(ii) Be

(iii) B

(iv) C


60. Which element has low ionization value?

(i) He

(ii) Li

(iii) Na

(iv) K


61. Which of the following is correct one?

(i) C = h / v

(ii) h = m/v


62. Balmer series lie in:

(i) infra red region

(ii) Visible region

(iii) Ultra – violet region

(iv) Invisible


63. The electron losses energy when:

(i) It jump from higher to lower orbit

(ii) It jumps from lower to higher orbit

(iii) Electron is in constant motion

(iv) All of these


64. In 1913. Mosely used the X- rays to determine the

(i) Mass number

(ii) Atomic number

(iii) Relative atomic mass

(iv) Avogadro’s Number


65. No two electrons in an atom can have a set of some four quantum number ” is


(i)Newton’ first law

(ii) Pauli’s exclusion principles

(iii) Hund’s rule

(iv) None of these


67. Two electrons in the helium atom:

(i) Have different spin quantum No.

(ii) Have same spin quantum No

(iii) Occupy different shells

(iv) None of these


68. T.V picture tube is a type of:

(i) X- rays tube

(ii) Discharge tube

(iii) Milliken tube

(iv) Positive rays tube


69. The presence of three unpaired electrons in nitrogen atom can be explained by:

(i) Pauliexclusion principle

(ii) Hund‘s rule

(iii) Aufbau principle

(iv) Heisenberg’s uncertainly principle


70. Velocity of:

(i) Alpha particles greater than beta particles

(ii) Beta particles greater than alpha particles

(iii) Alpha particles is same as beta particles

(iv) Alpha particles is same of velocity of lights


71. An electron is said to be excited inside an atoms is:

(i) It losses energy

(ii) More than zero

(iii) Less than Zero

(iv) Constant


72. The statement is not true:

(1) No two electrons can have the same set of tour quantum number

(ii) The energy level K contains only one orbital and two or less electrons

(iii) The energy level L has four orbital s and can have maximum of eight electrons

(iv) The N energy level contains six sub levels and maximum of 32 electrons


73. An orbital can have maximum of:

(i) 2 electrons

(ii) G electrons

(iii) 8 electrons

(iv) 32 electrons


74. In ground state carbon atoms has:

(i) Three unaired electrons

(ii) Two lone pair electrons

(iii) Two unpaired electrons

(iv) One unpaired electron


75. If t = 2 the orbital is called as Z

(i) s

(ii) d

(iii) f

(iv) p


78. The lowest energy level which can have electron can have is:

(i) L

(ii) K

(iii) M

(iv) N

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