Atomic Structure One Mark Questions

9th Standard

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Science

Time : 00:30:00 Hrs
Total Marks : 20
    5 x 1 = 5
  1. Among the following the odd pair is

    (a)

    8O18, 17cl37

    (b)

    18Ar40,7N14

    (c)

    14Si30, 15pd31

    (d)

    24cr54, 19K39

  2. The term nucleons refer to

    (a)

    Protons and electrons

    (b)

    only Neutrons

    (c)

    electrons and neutrons

    (d)

    Protons and neutrons

  3. The correct electronic configuration of potassium is

    (a)

    2,8,9

    (b)

    2,8,1

    (c)

    2,8,8,1

    (d)

    2,8,8,3

  4. Law of multiple proportions was proposed by _________

    (a)

    J. Ritcher

    (b)

    Rutherford

    (c)

    John Dalton

    (d)

    J.J Thomson

  5. 2H2 + 02 \(\longrightarrow \)2H20. This is a___________ reaction.

    (a)

    Combination

    (b)

    Displacement

    (c)

    Decompostion

    (d)

    Exothermic

  6. 5 x 1 = 5
  7. _________isotope is used in the treatment of goiter

    ()

       iodine 131

  8. The number of neutrons present in \(_{ 3 }^{ 7 }{ Li }\) is ------

    ()

      4 

  9. The valency of Argon is ________

    ()

       zero

  10. Positive charges are concentrated in the central region of the atom called __________

    ()

    Nucleus]

  11. Bohr model was applicable only to _________

    ()

    Hydrogen

  12. 5 x 1 = 5
  13. In an atom, electrons revolve around the nucleus in fixed orbits

    (a) True
    (b) False
  14. Isotopes of an element have the different atomic numbers

    (a) True
    (b) False
  15. Electrons have negligible mass and charge.

    (a) True
    (b) False
  16. Beta particle is negatively charged and is identical with electron.

    (a) True
    (b) False
  17. Orbit is the path by which electrons revolve around the nucleus. 

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. Dalton

  20. (1)

    Plum pudding model

  21. Thomson

  22. (2)

    Same atomic number but different mass number;

  23. Isotopes

  24. (3)

    \(\alpha \)-ray scattering experiment;

  25. Rutherford

  26. (4)

    same mass number

  27. Isobars

  28. (5)

    First atomic theory

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