Term 2 Atomic Structure One Mark Questions with Answer

8th Standard EM

    Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 16
    5 x 1 = 5
  1. The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of __________

    (a)

    reciprocal proportion

    (b)

    definite proportion

    (c)

    multiple proportion

    (d)

    conservation of mass

  2. Cathode rays are made up of

    (a)

    neutral particles

    (b)

    positively charged particles

    (c)

    negatively charged particles

    (d)

    None of the above

  3. In water, hydrogen and oxygen are combined in the ratio of _______by mass.

    (a)

    1:8

    (b)

    8:1

    (c)

    2:3

    (d)

    1:3

  4. Which of the following statements made by Dalton has not undergone any change?

    (a)

    Atoms cannot be broken.

    (b)

    Atoms combine in small, whole numbers to form compounds.

    (c)

    Elements are made up of atoms.

    (d)

    All atoms of an elements are alike

  5. In all atoms of an element

    (a)

    the atomic and the mass number are same.

    (b)

    the mass number is same and the atomic number is different

    (c)

    the atomic number is same and the mass number is different

    (d)

    both atomic and mass numbers may vary.

  6. 6 x 1 = 6
  7. ____________ is the smallest particle of an element.

    ()

      

  8. An element is composed of ____________ atoms.

    ()

      

  9. An atom is made up of ____________, ____________ and ____________.

    ()

      

  10. A negatively charged ion is called ____________, while positively charged ion is called ____________

    ()

      

  11. ____________ is a negatively charged particle (Electron/Proton).

    ()

      

  12. Proton is deflected towards the _________ charged plate (positively, negatively).

    ()

      

  13. 5 x 1 = 5
  14. Law of conservationof mass

  15. (1)

    Joseph Proust

  16. Law of constant proportion

  17. (2)

    Lavoisier

  18. Cathode rays

  19. (3)

    Goldstein

  20. Anode rays

  21. (4)

    James Chadwick

  22. Neutrons

  23. (5)

    Sir William Crookes

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