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 ) 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’
