Atomic Structure - NEET/JEE /KEAM

15 Questions | Total Attempts: 32

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Atomic Structure - NEET/JEE /KEAM

Each correct answer have 4 Marks Each wrong answers have -1 Mark Time - 15 Minutes ( 15 Questions )


Questions and Answers
  • 1. 
    If the energy of a proton is given as 3.03 × 10-19 J then, the wave length of the photon is: 
    • A. 

      6.56nm

    • B. 

      65.6 nm 

    • C. 

      656 nm

    • D. 

      0.656 nm

  • 2. 
    In the photo-electron emission, the energy of the emitted electron is
    • A. 

      Greater than the incident photon

    • B. 

      Same as than of the incident photon

    • C. 

      Smaller than incident photon 

    • D. 

      Proportional to the intensity of incident photon 

  • 3. 
    The electron was shown experimentally to have wave properties by 
    • A. 

      De Broglie

    • B. 

      Davisson and Germer 

    • C. 

      N. Bohr 

    • D. 

      Schrodinger 

  • 4. 
    Which of the following is never true for cathode rays?
    • A. 

      They possess kinetic energy

    • B. 

      They are electromagnetic waves 

    • C. 

      They produce heat

    • D. 

      They produce mechanical pressure 

  • 5. 
    According to the Bohr theory, which of the following transmissions in the hydrogen atom will give rise to the least energetic photon?
    • A. 

      N= 6 to n=1 

    • B. 

      N=5 to n= 4

    • C. 

      N= 6 to n= 5 

    • D. 

      N= 5 to n=3

  • 6. 
    In hydrogen atom, energy of first excited state is -3.4 eV. Find out KE of the same orbit of Hydrogen atom
    • A. 

      +3.4 eV

    • B. 

      +6.8 eV

    • C. 

      -13.6 eV

    • D. 

      +13.6 eV

  • 7. 
    According to Bohr's theory the energy required of for an electron in the Li​​​​​2+ ion to be emitted from n= 2 state is (given that the ground state ionization energy of hydrogen atom is 13.6 eV)
    • A. 

      61.2 eV

    • B. 

      13.6 eV

    • C. 

      30.6 eav

    • D. 

      10.2 eV

  • 8. 
    The Bohr orbit radius for the hydrogen atom(n=1) is approximately 0.530 A. The radius for the first excited state (n=2) orbit is (in A)
    • A. 

      0.13 

    • B. 

      1.06

    • C. 

      4.77

    • D. 

      2.12 

  • 9. 
    The radius of hydrogen atom in the ground state is 0.53 A. The radius of Li​​​​​2+ ion (atomic number= 3) in a similar state is, 
    • A. 

      0.17 A

    • B. 

      0.265 A 

    • C. 

      0.53 A 

    • D. 

      1.06 A 

  • 10. 
    If ionization potential for hydrogen atom is 13.6 eV, then ionization potential for He+ will be, 
    • A. 

      54.4 eV

    • B. 

      6.8 eV

    • C. 

      13.6 eV

    • D. 

      24.5 eV

  • 11. 
    If r is the radius of the first orbit, the radius of n​​​th orbit of H- atom is given by
    • A. 

      Rn​​​​​2

    • B. 

      Rn

    • C. 

      R/n

    • D. 

      R​​​​​​2​​​n2

  • 12. 
    The spectrum of He is expected to be similar to that
    • A. 

      H

    • B. 

      Li​​​+

    • C. 

      Na 

    • D. 

      He+

  • 13. 
    Two electrons occupying the same orbital are distinguished by
    • A. 

      Principal quantum number

    • B. 

      Magnetic quantum number

    • C. 

      Azimuthal quantum number

    • D. 

      Spin quantum number 

  • 14. 
    The correct set of four quantum numbers for the valence electron of rubidium atom (Z= 37) is, 
    • A. 

      5,1,+1/2

    • B. 

      6,0,0 +1/2

    • C. 

      5,0,0 +1/2

    • D. 

      5,1, 0 +1/2

  • 15. 
    The total number of atomic orbitals in fourth energy level of an atom is: 
    • A. 

    • B. 

      16 

    • C. 

      32

    • D. 

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