Unit 6 Structure of Atoms – General Science online quiz class 7

Unit-6-Structure-of-Atoms-General-Science-MCQs-class-7

Class 7 General Science, Chapter # 6, online quiz, test with answers

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Unit 6 Structure of Atoms

Class 7 General Science, Chapter # 6, Online Quiz

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Category: General Science

1. Atom is electrically ____

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2. Atoms of same element having same number of protons but different number of neutrons are called:

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3. ____ are the basic building block of matter and can take part in a chemical reaction.

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4. ______ have a positive (+) charge

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5. With the help of chemical formula we can find:

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6. Electron revolve around the nucleus in particular paths called

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7. The number of protons and the number of electrons are ___

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8. The first orbit near the nucleus is:

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9. ____ isotopes are used to detect the leakage of pipelines.

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10. Atomic number is denoted by  _____ 

 

 

 

 

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11. These have same number of protons in each atom but the neutron number can vary:

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12. _____ reside in the nucleus.

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13. Heavy hydrogen is:

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14. Law of constant composition was presented by:

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15. The maximum number of electrons in fourth orbit N=

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16. ____ revolve in orbits around the nucleus.

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17. Sub-atomic or fundamental particles of atom have ____ types:

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18. The particle that carries a negative electrical charge.

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19. The maximum number of electrons in first orbit K=

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20. The maximum number of electrons in second orbit L=

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21. The general formula for electrons distribution is:

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22. The representation of a molecule of a compound in the form of symbols is called:

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23. Physical properties of some isotopes may be:

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24. Each sample of carbon dioxide contains:

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25. For treatment of goiter, an isotope of ____ is used:

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26. Atoms containing less than four electrons in its outermost shell, its valency is equal to the number of:

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27. ____ depends upon the number of electrons present in the outermost shell.

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28. Every simple of pure substance always contains same elements in fixed proportion regardless of:

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29. Protons and neutrons reside in the nucleus, thus they are also known as:

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30. Deuterium “D” has one proton, ____ neutron and one electron

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31. Radioactive isotope of hydrogen is:

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32. If an electron or more than one electrons are added to an atom, it becomes a negative ion which is also known as:

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33. An atom of carbon contains 6 protons and 6 neutrons, its mass number will be

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34. The combining capacity of the atoms to form molecules either with same or different elements is known as

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35. The atoms of same elements which have same atomic number but different mass number are called:

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36. The sum of the number of protons and number of neutrons

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37. ____ is a charged particle that is formed by the removal or addition of one or more electrons from an atom or molecule.

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38. The outermost orbit cannot have more than _____ electrons

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39. Water always contain:

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40. Protons and neutrons are responsible for most of the _____

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41. Sodium has one electron in its outermost shell, so the valency of sodium is:

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42. Tritium isotope has one proton, ____ neutron and one electron.

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43. ____ have a negative charge.

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44. The word atom is derived from the Greek word “atomos” which means:

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45. The idea of atoms was first proposed by the Greek philosopher Democritus in

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46. ______ no charge.

 

 

 

 

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47. Ions have ____ types:

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48. Some isotopes are radioactive i.e they “radiate”:

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49. The center or core of an atom is called:

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50. _____ is the number of protons or electrons

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51. Mass number is nearly equal to atomic mass of an atom and is denoted by:

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52. An isotope of ____ is used to determine the age of old material like trees.

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53. The chemical properties of isotopes are the:

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54. Chlorine has seven electrons in its outermost shell, so the valency of chlorine is:

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55. Hydrogen has ____ isotopes:

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56. The idea that all matter is made up of atoms was first proposed by the ____ philosopher.

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57. ____ has mass and occupies space

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58. If the outermost shell has more than four electrons, its valency will be equal to 8 minus the number of:

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59. Ordinary naturally occurring hydrogen contains the largest percentage of:

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60. An isotope of ____ is used as fuel in a nuclear reactor.

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61. The number of tritium isotope is one in ____ millions.

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62. An isotope of ____ is used in the treatment of cancer.

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63. Atoms of different elements with different atomic numbers but have the same mass number are called:

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64. The maximum number of electrons in third orbit M=

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65. An element has seven electrons in its valence shell. Its valency is:

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66. Protium hydrogen has one proton, ____ neutron and one electron.

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67. If an electron or more than one electrons are removed from an atom, it become a positive ion which is also known as:

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