CBSE Class 7 Science The Structure of the Atom MCQs

CBSE Class 7 Science The Structure of the Atom MCQs. Multiple choice questions have become an integral part of the CBSE examination system. Almost all exams have a section for MCQs. Students are advised to refer to the attached MCQ database and practise them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the MCQs to their children for practice.

 

1. The energy associated with an orbit
(A) increases with his distance from the nucleus
(B) decreases with increase in the distance from nucleus
(C) remains constant whatever may be the distance
(D) none of these

2. The orbits are numbered by
(A) 100, 200, 300.... (B) 10, 20, 30.... (C) 1, 2, 3, 4.... (D) 5, 10, 15....

3. The shells or orbits are denoted by
(A) K, L, M, N,..... (B) a, b, c, d,.... (C) A, B, C, d,.... (D) V, W, X, Y, Z,....

4. The shell which has two electrons is
(A) first shell (B) second shell (C) third shell (D) fourth shell

5. Maximum number of electrons, the third shell can accommodate is
(A) 32 (B) 2 (C) 8 (D) 18

6. In general, the nth shell can accommodate_____ electrons where ‘n’ stands for number of the shell.
(A) 3n2 (B) 2n2 (C) n2 (D) 2n

7. The distribution of _____ in various orbits of an atom is called electronic configuration of element
(A) neutrons (B) protons (C) electrons (D) all of these

8. The electronic configuration of oxygen
(A) 2, 7 (B) 2, 6 (C) 2, 4, 2 (D) 4, 4

9. 2, 8,1 is the electronic configuration of
(A) lithium (B) potassium (C) helium (D) sodium

10. Number of electrons in the outermost shell of carbon is
(A) 4 (B) 6 (C) 3 (D) 8

11. Total number of electrons in an atom of nitrogen is
(A) 9 (B) 6 (C) 8 (D) 7

12. The noble gases from the following are
(A) O2, N2, H2 (B) Cl, F, Br (C) He, Ne, Ar (D) Na, K, Ca

13. Noble gases do not react with other elements to form compounds because
(A) they are unstable (B) they are gases (C) they are stable (D) they are already compounds

14. In a chemical reaction, ___________ participate.
(A) valence electrons (B) all electrons of the atom (C) protons (D) electrons and protons

15. The valency of an element is its
(A) electronic configuration (B) combining capacity (C) atomic number (D) mass number

16. Atoms combine to attain stable configuration by
(A) sharing electrons (B) sharing, accepting or donating electrons
(C) donating electrons (D) accepting electrons

17. A chlorine atom has ____ protons, _____ electrons and _____ neutrons.
(A) 18, 17, 18 (B) 17, 18, 18
(C) 17, 17, 18 (D) 17, 17, 17

18. The number of electrons shared between two oxygen atoms is
(A) 2 (B) 1 (C) 2 (D) 4

19. The number of electrons shared by each chlorine atom to form a molecule is
(A) 2 (B) 1 (C) 3 (D) 7

20. In a CO2 molecule, the total number of electrons shared between a carbon and two oxygen atoms are
(A) 8 (B) 4 (C) 2 (D) 6

21. In the formation of NaCl, sodium atom
(A) receives an electron (B) shares an electron (C) does not react (D) donates an electron

22. Sodium ion (Na+) has ____ number of electrons
(A) 10 (B) 12 (C) 11 (D) 13

23. When chlorine atom becomes chloride ion it
(A) loses an electron gains an electron (B) gains an electron
(C) electrostatic force (D) magnetic force

24. Sodium and chlorine atoms are held together in NaCl by
(A) electromagnetic force (B) gravitational force
(C) electrostatic force (D) magnetic force
 
25. An atom that becomes charged by gaining or losing an electron is called
(A) cation (B) anion
(C) ion (D) electron
 
26. Compound formed by sharing electrons is called
(A) ionic compound (B) electrovalent compound
(C) covalent compound (D) coordinate compound
 
27. Cations are carry
(A) both positive and negative charges (B) neutral charge
(C) negative charge (D) positive charge
 
28. Mg →Mg2+ ______
(A) 2 electrons (B) 1 electrons
(C) no electrons (D) 2 protons
 
29. An aluminium ion carries _____ units of positive charge
(A) 2 (B) 3
(C) 1 (D) 4
 
30. Oxygen atom becomes an oxide ion by
(A) losing two electrons (B) gaining two electrons
(C) gaining one electron (D) losing one electron
 
31. The scientist who put forward the atomic theory in 1808 was
(A) Dalton (B) Lavoiser
(C) Galileo (D) Thomson
 
32. According to the atomic theory
(A) matter is not created but can be destroyed in a chemical reaction.
(B) matter is neither created nor destroyed in a chemical reaction
(C) matter is created but not destroyed in a chemical reaction
(D) matter can be created and destroyed in a chemical reaction
 
33. Which of the following statement is true?
(A) Elements combine in fixed proportion by volume to form compounds
(B) Elements combine in fixed proportions by weights to form compounds
(C) elements combine in fixed proportion by mass to form compounds
(D) None of these
 
34. The scientist who measured the mass and charge of an electron was
(A) Goldstein (B) Rutherford
(C) Dalton (D) Thomson
 
35. The mass of an electron is
(A) 1837 times the mass of proton (B)1/1837 th times the mass of hydrogen atom
(C)1/1831 th times the mass of oxygen atom (D)1/1837 th times the mass of carbon atom
 
36. The mass of proton is about the same as that of
(A) carbon atom (B) an electron
(C) hydrogen ion (D) oxygen atom
 
37. Rutherford directed a stream of _____ on a thin gold leaf in the scattering experiment
(A) alpha particles (B) beta particles
(C) gamma particles (D) X-rays
 
38. Based on his experiments, Rutherford concluded that the positive charge of an atom is
(A) spread all over the atom (B) revolves around the atom in orbits
(C) exists in the empty space (D) present in the nucleus
 
39. Atomic number of an atom is the
(A) number of protons + number of neutrons (B) number of neutrons
(C) number of electrons + number of protons (D) number of protons
 
40. Atomic number of an element is denoted by
(A) X (B) A
(C) Z (D) N
 
41. In a neutral atom, the number of protons is equal to
(A) half the number of electrons (B) number of electrons
(C) number of neutrons (D) number of neutrons + number of electrons
 
42. Atomic mass of an element is the number of times by which the mass of its atom is greater than
(A) 1/12 th mass of carbon atom (B) 1/12 th mass of hydrogen atom
(C) 1/12 th mass of oxygen atom (D) 1/12 th mass of helium atom
 
43. Neutrons were discovered by
(A) Joseph Thomson (B) James Chadwick
(C) Ernest Rutherford (D) John Dalton
 
44. Mass of neutron is equal to
(A) that of an electron (B) half the mass of an electron
(C) the mass of a proton (D) half the mass of a proton
 
45. The mass number of an element is the sum of the numbers of
(A) protons and electrons (B) electrons and neutrons
(C) protons, electrons and neutrons (D) protons and neutrons
 
46. The mass number of an element is denoted by
(A) A (B) Z
(C) X (D) N
 
47. The element with the same atomic and mass number is
(A) oxygen (B) hydrogen
(C) helium (D) carbon
 
48. In the periodic table, the elements are arranged in the
(A) increasing order of atomic mass (B) decreasing order of atomic number
(C) alphabetical order (D) increasing order of atomic number
 
49. The symbol of the element sodium is
(A) Si (B) S
(C) Na (D) N
 
50. K is the symbol of
(A) potassium (B) calcium
(C) krypton (D) aluminium
 
51. The element with the same atomic number and mass number is
(A) Oxygen (B) Hydrogen
(C) Helium (D) Carbon
 
52. The mass of an electron is
(A) 1837 times the mass of proton (B) 1/1837th times the mass of oxygen atom
(C) 1/1837th times the mass of carbon atom (D) 1/1837th times the mass of hydrogen atom
 
53. The scientist who put forward the atomic theory in 1808 was
(A) Dalton (B) Lavoiser
(C) Galileo (D) Thomson
 
54. The mass number of an element is the sum of the number of
(A) Proton and electron (B) Electron and neutrons
(C) Protons, electrons and neutrons (D) Protons and neutrons
 
55. Rutherford directed a stream of __________on a thin Gold leaf in the scattering experiment
(A) Alpha particle (B) Beta particle
(C) Gamma particle (D) X-rays
 
56. In the periodic table, the elements are arranged in the
(A) Increasing order of atomic mass (B) Decreasing order of atomic number
(C) Alphabetical order (D) Increasing order of atomic number
 
57. In a neutral atom, the number of protons is equal to
(A) Number of electrons (B) Half the number of electrons
(C) Number of neutrons (D) Number of electrons and neutrons
 
58. The mass number of an element is denoted by
(A) A (B) Z
(C) X (D) N
 
59. The e/m ratio of an electron for all types of substances is
(A) constant (B) less than one
(C) greater than one (D) zero
 
60. A proton is identical to
(A) the nucleus of berellium (B) the nucleus of helium
(C) a molecule of a hydrogen (D) an atom of hydrogen
 
61. An particle is
(A) a hydrogen molecule (B) a helium nucleus
(C) an electron (D) a proton
 
62. The atomic number of an element is determined by
(A) the number of electrons in one atom (B) the number of neutrons in one atom
(C) the valency of the element (D) the number of protons in one atom
 
63. The value of e/m of an electron was measured by
(A) Millikan (B) J.J. Thomson
(C) Dalton (D) Rutherford
 
64. The atomic number of an element is 11 and its mass number is 23. The respective number of electrons, protons and neutrons in this atom will be
(A) 11, 11, 12 (B) 11, 12, 11
(C) 12, 11, 11 (D) 23, 11, 23
 
65. The number of electrons in the outer shell of the most stable or inert atoms is
(A) 1 (B) 4
(C) 6 (D) 8
 
66. Which of the following pairs are isotopes?
(A) Oxygen and ozone (B) Ice and steam
(C) Nitric oxide and nitrogen dioxide (D) Hydrogen and deuterium
 
67. An atom which has a mass number of 14 and has 8 neutrons is an
(A) isotope of oxygen (B) isobar of oxygen
(C) isotope of carbon (D) isobar of carbon
 
68. Which of the following has an equal number of neutrons and protons?
(A) Hydrogen (B) Deuterium
(C) Fluorine (D) Chlorine
 
69. Members of which of the following have similar chemical properties?
(A) Isotope (B) Isobars
(C) Allotropes (D) Both isotopes and allotropes
 
70. An atom of an element has 26 electrons and has a mass number 56. The nucleus of this atom contains ______ neutrons
(A) 26 (B) 36
(C) 30 (D) 56
 
71. For an element with atomic number 19, the 19th electron will occupy
(A) L-shell (B) M-shell
(C) N-shell (D) K-shell
 
72. The number of electrons in an element with atomic number X and atomic mass Y will be
(A) X – Y (B) Y – X
(C) X + Y (D) X
 
73. A natural phenomenon that supports the experimental conclusion that atoms are divisible is
(A) allotropy (B) radioactivity
(C) cracking (D) none of these
 
 
CBSE Class 7 Science The Structure of the Atom MCQs.

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