1. Home
  2. 8th Standard
  3. Science
  4. 8th Standard Science - Atomic Structure Model Question Paper

Updated 8th Standard Science Study Materials 2022-2023 Exams

8th Standard Science - Atomic Structure Model Question Paper Oct-04 , 2019

Atomic Structure 

8th Standard Science - Atomic Structure Model Question Paper

Atomic Structure Model Question Paper

8th Standard

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Science

Time : 00:45:00 Hrs
Total Marks : 30
    4 x 1 = 4

  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. 2 x 1 = 2

  5. A negatively charged ion is called _________, while positively charged ion is called __________

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    anion, cation

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

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    negatively

    7. 5 x 1 = 5

  7. Law of conservation of mass

    8. (1)

    James Chadwick

  8. Law of constant proportion

    9. (2)

    Lavoisier

  9. Cathode rays

    10. (3)

    Goldstein

  10. Anode rays

    11. (4)

    Sir William Crookes

  11. Neutrons

    12. (5)

    Joseph Proust
    4 x 2 = 8

  12. State the law of conservation of mass.

  13. Write the properties of anode rays.

  14. Define the term ions or radicals

  15. What is a chemical equation?

    16. 2 x 3 = 6

  16. Find the valency of the element which is underlined in the following formula.
    a) NaCl
    b) CO2
    c) Al (PO4)
    d) Ba (NO3)2
    e) CaCl2

  17. Write the skeleton equation for the following word equation and then balance them.
    a) Carbon + Oxygen → Carbon dioxide
    b) Phosphorus + Chlorine → Phosphorus pentachloride.
    c) Sulphur + Oxygen → Sulphur dioxide
    d) Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride

    18. 1 x 5 = 5

  18. How can we prove that the electrons carry negative charge?

*****************************************

Reviews & Comments about 8th Standard Science - Atomic Structure Model Question Paper

Write your Comment