Atomic Structure One Mark Questions

7th Standard EM

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Science

Time : 00:30:00 Hrs
Total Marks : 20
    5 x 1 = 5
  1. The basic unit of matter is ________

    (a)

    Element

    (b)

    Atom

    (c)

    Molecule

    (d)

    Electron

  2. _______ is positively charged.

    (a)

    Proton

    (b)

    Electron

    (c)

    Molecule

    (d)

    Neutron

  3. The average diameter of an atom is ____________

    (a)

    10-8 m

    (b)

    1 m

    (c)

    1 Ao

    (d)

    10-5 m

  4. Whose theory does not propose anything about the positive and negative charges of an atoms.

    (a)

    J.J. Thomson

    (b)

    Dalton

    (c)

    Rutherford

    (d)

    Bohr

  5. ____________ is the smallest unit used to measure small lengths

    (a)

    Metre

    (b)

    Nanometre

    (c)

    Millimetre

    (d)

    Centimetre

  6. 5 x 1 = 5
  7. The _______ revolve around the nucleus.

    ()

    electrons

  8. If the valency of carbon is 4 and that of hydrogen is 1, then the molecular formula of methane is___________.

    ()

    C4

  9. ____________ is the smallest particle of a chemical element.

    ()

    Atom

  10. The __________ are combination of atoms of various elements or the same element.

    ()

    molecules

  11. According to John Dalton, atom is a hard, solid, ball and it is ______________

    ()

    indivisible

  12. 5 x 1 = 5
  13. A neutron is a neutral particle

    (a) True
    (b) False
  14. J.J. Thomson proposed than an atom consists of positively charged sphere in which the electrons are embedded

    (a) True
    (b) False
  15. The outermost orbit of an atom can have more than 8 electrons.

    (a) True
    (b) False
  16. Most of the space in an atom is occupied by electrons

    (a) True
    (b) False
  17. Rutherford used beta particles in his scattering experiments

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

  20. (1)

    Fe

  21. Neutral Particle

  22. (2)

    Electrons in the outermost Orbit

  23. Iron

  24. (3)

    Proton

  25. Hydrogen

  26. (4)

    Monovalent

  27. Positively charged Particle

  28. (5)

    Neutron

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