MCQ on Maharashtra state Board 8th science topic 5. Inside the Atom

1) An atom is formed from the nucleus and the extra-nuclear part.

A ) True

B ) False

Ans A ) True

 

2) Which of the following is the correct electronic configuration of Sodium (11)?

A ) 2, 8

B ) 1, 8, 2

C ) 2, 8, 1

D ) 2, 1, 8

Ans C ) 2, 8, 1

 

3 ) If the electronic configuration of an element is (2,5), then the valency of the element is ……………

A ) 7

B ) 3

C ) 2

Ans B ) 3

 

4 ) Each electron carries one unit of negative charge.

A ) True

B ) False

Ans A ) True

 

5 ) The valency of an element with 32 nucleons and 16 electrons is …………… .

A ) 6

B ) 8

C ) 0

D ) 2

Ans D ) 2

 

6 ) The number of electron is equal to the number of neutrons.

A ) True

B ) False

Ans B ) False

 

7 ) Cadmium is used as moderator for reducing the speed of neutrons in nuclear reactor.

A ) True

B ) False

Ans B ) False

 

8 ) The mass number is denoted by the symbol …………… .

A ) ‘A’

B ) ‘Z’

Ans A ) ‘A’

 

9 ) Energy of an electron is constant while it is in a particular orbit.

A ) True

B ) False

Ans A ) True

 

10 ) Atoms of the same element having different mass number.

A ) Isobars

B ) Isotopes

Ans B ) Isotopes

 

11 ) Isotopes have same atomic mass number but different atomic number.

A ) True

B ) False

Ans B ) False

 

12 ) If the electronic configuration of an element is (2, 6), then the valency of the element is ……………

A ) 6

B ) 8

C ) 2

Ans C ) 2

 

13 ) If the electronic configuration of an element is (2, 8), then the valency of the element is ……………

A ) 0

B ) 8

C ) 2

Ans A ) 0

 

14 ) Rutherford’s experiment is named as.

A ) Scattering experiment

B ) Electron-scattering experiment Ans B ) Electron-scattering experiment 15 ) Carbon : (2,4) :: Oxygen : ……………

A ) 2, 8

B ) 2, 6

Ans B ) 2, 6

 

15  ) ‘K’ shell: 2 electrons:: ‘M’ shell : ……………

A ) 8

B ) 18

C ) 32

Ans B ) 18

 

16 ) According to Thomson, an atom is electrically neutral.

A ) True

B ) False

Ans A ) True

 

17 ) Smallest particles of most of the substances are molecules.

A ) True

B ) False

Ans A ) True

 

18 ) Molecules are formed from atom.

A ) True

B ) False

Ans A ) True

 

19 ) First nuclear reactor in India.

A ) Mumbai

B ) Pune

Ans A ) Mumbai

 

20 ) Shortcoming of Rutherford’s atomic model was put forth by.

A ) Thomson

B ) Niels Bohr

Ans B ) Niels Bohr

 

21 ) Isotope of hydrogen 13 H is called

A ) Protium

B ) Deuterium

C ) Tritium

Ans C ) Tritium

 

22 ) The symbol is used for the ordinal number of the shell.

A ) ‘a’

B ) ‘n’

C ) ‘z’

Ans B ) ‘n’

 

23 ) If the electronic configuration of an element is (2, 8, 18, 3), then the valency of the element is ……………

A ) 3

B ) 5

C ) 2

Ans A ) 3

 

24 ) Smallest particle of an element taking part in chemical combination is an atom.

A ) True

B ) False

Ans A ) True

 

25 ) The mass of one hydrogen atom is approximately 1 u.

A ) True

B ) False

Ans A ) True

 

25) The positive charge particle has mass 1800 times less than a hydrogen atom.

A ) True

B ) False

Ans B ) False

 

26) The maximum number of electron a shell can contain is obtained by the formula ……………

A ) 2n

B ) 2n2

C ) 22n

Ans B ) 2n2

 

27) consists of single type of atoms in a molecule.

A ) Ammonia

B ) Hydrogen chloride

C ) Bromine

D ) Methane

Ans C ) Bromine

 

28) The valency of inert gas elements is …………… .

A ) Zero

B ) One

C ) Two

D ) Three

Ans A ) Zero

 

29) The electron of sodium absorbs energy and goes to the outermost shell and comes back to the inner shell by emitting energy.

A ) Yes

B ) No

Ans A ) Yes

 

30) On road, sodium vapour lamps gives white light.

A ) Yes

B ) No

Ans B ) No

 

31 ) Chlorine : (2,8,1) :: Lithium : ……………

A ) (2, 1)

B ) (2, 2)

Ans A ) (2, 1)

 

32) The mass of a neutron is approximately equal to the mass of a proton.

A ) True

B ) False

Ans A ) True

 

33) If the electronic configuration of an element is (2, 4), then the valency of the element is ……………

A ) 6

B ) 8

C ) 4

Ans C ) 4

 

34 )

Shell

 

Electron capacity of the shell

Symbol

n

Formula: 2n2

Number of electrons

K

1

2 x (1)2

 

L

2

2 x (2)2

 

M

3

2 x (3)2

 

N

4

2 x (4)2

 

A )

Shell

 

Electron capacity of the shell

Symbol

n

Formula: 2n2

Number of electrons

K

1

2 x (1)2

8

L

2

2 x (2)2

2

M

3

2 x (3)2

32

N

4

2 x (4)2

18

Shell

 

Electron capacity of the shell

B )

Symbol

n

Formula: 2n2

Number of electrons

K

1

2 x (1)2

2

L

2

2 x (2)2

8

M

3

2 x (3)2

18

N

4

2 x (4)2

32

Ans

Shell

 

Electron capacity of the shell

Symbol

n

Formula: 2n2

Number of electrons

K

1

2 x (1)2

2

L

2

2 x (2)2

8

M

3

2 x (3)2

18

N

4

2 x (4)2

32

B )

35) All elements except hydrogen contain neutrons.

A ) True

B ) False

Ans A ) True

36 ) Protons and Electrons are the two types of nucleons.

A ) True

B ) False

Ans B ) False

37 ) If the electronic configuration of an element is (2, 8, 8), then the valency of the element is ……………

A ) 8

B ) 2

C ) 0

Ans C ) 0

38 ) The positive charge on the nucleus is due to the neutron in it.

A ) True

B ) False

Ans B ) False

39 ) According to Niels Bohr, electrons lie in concentric circular orbits at certain distance from the nucleus.

A ) True

B ) False

Ans A ) True

40 ) Plum pudding model of atom was put forth by Dalton.

A ) True

B ) False

Ans B ) False

 

41 ) Atoms are formed by chemical combination of molecules.

A ) True

B ) False

Ans B ) False

 

42 ) The energy of an electron is determined by the shell in which it is present.

A ) True

B ) False

Ans A ) True

 

43  ) Large number of α-particles went straight because ……………

A ) There were no obstacles in the path

B ) α -particles could pass through heavy part in the atom easily.

Ans A ) There were no obstacles in the path

 

44 ) According to , atoms are supposed to be indivisible.

A ) Rutherford’s atomic model

B ) Dalton’s atomic model

C ) Thomson’s atomic model

D ) Bohr’s atomic model

Ans B ) Dalton’s atomic model

 

45 ) According to John Dalton, the structure of atom is a hard, solid ball with no internal structure.

A ) True

B ) False

Ans A ) True

 

46 ) If the proton number is 17, electronic configuration of the element will be …………….

A ) 2, 8, 8, 1

B ) 2, 8, 7

C ) 2, 8, 18

D ) 2, 8, 8, 3

Ans B ) 2, 8, 7

 

47 ) The shell wise distribution of the electron in an atom of an element is called the electronic configuration of that element.

A ) True

B ) False

Ans A ) True

48 ) The atomic nucleus is positively charged.

A ) True

B ) False

Ans A ) True

 

49) Energy of an electron in the first shell is the lowest.

A ) True

B ) False

Ans A ) True

 

50) Valency means the number of chemical bonds formed by an atom.

A ) True

B ) False

Ans A ) True

 

51 ]

 A small number of α-particles got deflected through small angle because ……………

A ) There were empty spaces inside the atoms.

B ) They faced obstruction in the path                                                . Ans B ) They faced obstruction in the path.   

                 

 52 ) Tritium is an isotope of …………… .

A ) Carbon

B ) Chlorine C ) Hydrogen D ) Nitrogen

Ans C ) Hydrogen

 

53) The extra-nuclear part in the atomic structure includes the electrons and the empty spaces in between the nucleus and the electron.

A ) True

B ) False

Ans A ) True

 

54 ) According to John Dalton, matter is made of atoms.

A ) True

B ) False

Ans A ) True

 

55 ) Rutherford’s atomic model was named.

A ) Nuclear atomic model

B ) Stable orbit atomic model

Ans A ) Nuclear atomic model

 

56 ) The shell is nearest to the nucleus.

A ) K

B ) L

C ) M

Ans A ) K

 

57 ) The total negative charge on all the electrons is equal to the positive charge on the nucleus.

A ) True

B ) False

Ans A ) True

 

58 ) Number of protons in Sodium are 11. So, number of electrons in the outermost shell will be

A ) 8

B ) 1

C ) 2

D ) 3

Ans B ) 1

 

59 ) The fundamental property of an element.

A ) Atomic number

B ) Mass number

Ans A ) Atomic number

 

60 ) Neutron is an electrically neutral subatomic particle.

A ) True

B ) False

Ans A ) True

 

61 ) The number of protons in the nucleus of an atom is the atomic number of that element.

A ) True

B ) False

Ans A ) True

 

62 ) The element has a zero valency.

A ) Hydrogen

B ) Sodium

C ) Oxygen

D ) Helium

Ans D ) Helium

 

63 ) According to Thomson, the negative charge is distributed throughout the atom and the positive charges are embedded in it.

A ) True

B ) False

Ans B ) False

 

64 ) Methane consists of different types of atoms in the molecule.

A ) True

B ) False

Ans A ) True

 

65 ) The convention to denote atomic symbol is ……………

A ) A symbol Z

B ) z  A symbol Symbol A

C ) Z

Ans A ) A symbol

 

66 ) Identify the Model.

Z

A ) Dalton’s Atomic Model

B ) Thomson’s Plum pudding Model

Ans A ) Dalton’s Atomic Model

 

67 ) India has a large reserve of the element …………… .

A ) U – 235 B ) Th-232 C ) U-238 D ) Kr-92

Ans B ) Th-232

 

68  ) ‘L’ shell: 8 electrons:: ‘N’ shell : ……………

A ) 2

B ) 18

C ) 32

Ans C ) 32

 

69 ) Element used as a moderator for reducing the speed of neutrons in nuclear reactor.

A ) Lead

B ) Graphite

Ans B ) Graphite

 

70 ) H2 is a molecule with different types of atoms.

A ) True

B ) False

Ans B ) False

 

71) Three isotopes of Carbon

12 13 14

C, C, C

A ) 6 6 6

11 12 13

C, C, C

B ) 6 6 6

Ans 12 C, 13 C, 14 C

 

A ) 6 6 6

72 ) Element used as controller in nuclear reactor.

A ) Lithium

B ) Beryllium

Ans B ) Beryllium

73 ) Isotope of hydrogen 11H is called.

A ) Protium

B ) Deuterium

C ) Tritium

Ans A ) Protium

 

74 ) According to Rutherford, the entire mass of the atom is concentrated in the nucleus.

A ) True

B ) False

Ans A ) True

 

75 ) The difference of energy level of these two shells of sodium is fixed. This difference is similar to energy of yellow light.

A ) Yes

B ) No

Ans A ) Yes

 

76 ) Atoms are indivisible and indestructible according to Thomson.

A ) True

B ) False

Ans B ) False

 

77 ) When table salt is thrown on LPG gas stove flame, yellow sparks are given out.

A ) Yes

B ) No

Ans A ) Yes

 

78 ) In modern times, the concept of atom started with Dalton’s atomic theory.

A ) True

B ) False

Ans A ) True

 

79 ) Argon is an element.

A ) True

B ) False

Ans A ) True

 

81 ) The foil used in Rutherford’s experiment.

A ) Gold

B ) Silver

Ans A ) Gold

 

82 ) An atom is the smallest unit of matter.

A ) True

B ) False

Ans A ) True

 

83 ) If an atom has 8 protons then the atomic number of the element is ……………

A ) 10

B ) 16

C ) 8

Ans C ) 8

 

84 ) If the electronic configuration of an element is (2, 8, 2), then the valency of the element is ……………

A ) 6

B ) 8

C ) 2

Ans C ) 2

 

85 ) Valence electrons refers to the ……………

A ) Total number of electrons.

B ) Total number of protons and neutrons in nucleus.

C ) Total number of electrons in the outermost shell.

D ) Total number of electrons in the first shell.

Ans C ) Total number of electrons in the outermost shell.

 

86 ) Isotope of hydrogen 2 H is called

1

A ) Protium

B ) Deuterium

C ) Tritium

Ans B ) Deuterium

 

87 ) When an electron jumps from the inner orbit to an outer orbit, it emits energy.

A ) True

B ) False

Ans B ) False

 

88 ) If the atomic number of Na is 11 and Atomic mass number is 23 then it is denoted as ……………

11

Na

A ) 23

23

Na

B ) 11

Ans B ) 23

Na

11

 

89 ) Each electron has a definite energy as per the shell in which it is present.

A ) True

B ) False

Ans A ) True

 

90 ) The maximun number of electrons that can be present in N-shell of an atom is …………… .

A ) 8

B ) 32

C ) 16

D ) 20

Ans B ) 32

 

91 ) Radioactive isotopes are used for food preservation from microbes.

A ) True

B ) False

Ans A ) True

 

92 ) A small number of α-particles got deflected by big angle because ……………

A ) The heavy part causing obstruction would be in the centre of the atom.

B ) The heavy part causing obstruction would be at the side of the atom.

Ans A ) The heavy part causing obstruction would be in the centre of the atom.

 

93 ) Age of archeological objects : C-14 :: Detection of cracks in underground pipes : ……………

A ) Iodine-131

B ) Sodium-24

Ans B ) Sodium-24

 

94 ) If an atom has atomic number 20 and mass number 40, then number of neutrons in the atom will be ……………

A ) 10

B ) 22

C ) 20

Ans C ) 20

 

95 ) Atomic number of an element is represented by the symbol …………… .

A ) A

B ) P

C ) N

D ) Z

Ans D ) Z

 

) Sodium: valency1:: Nitrogen : ……………

A ) Valency 3

B ) Valency 2

Ans A ) Valency 3

 

 

96) Identify the Model.

A ) Dalton’s Atomic Model

B ) Thomson’s Plum pudding Model

Ans B ) Thomson’s Plum pudding Model

 

97 ) isotope is used to determine cracks in underground pipes.

A ) Sodium-24

B ) Cobalt-60

C ) Uranium-235

D ) Iodine-131

Ans A ) Sodium-24

 

98 ) The mass of is negligible.

A ) A proton

B ) An electron

Ans B ) An electron

 

59 ) Two isotopes of Chlorine

35 Cl and 33 Cl

A ) 17 17

35 Cl and 37 Cl

B ) 17 17

Ans 35 Cl and 37 Cl

B ) 17 17

 

60 ) If the electronic configuration of an element is (2), then the valency of the element is ……………

A ) 8

B ) 0

C ) 2

Ans B ) 0

 

61 ) Muni Kanad named the indivisible particles as ‘Atomos’.

A ) True

B ) False

Ans B ) False

 

62 ) The particles used for bombardment in Rutherford’s experiment.

A ) α

B ) β

Ans A ) α

 

63 ) The atomic number is denoted by the symbol ……………

A ) ‘A’

B ) ‘Z’

Ans B ) ‘Z’

 

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