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Online Tests
Chemistry 9th Class English Medium Unit 2 Online Test MCQs With Answers
Question # 1
The number of electrons in K shell of O is ________________
Choose an answer
9
10
2
1
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Question # 2
In isotopes numbers of ________________ is same.
Choose an answer
Protons
Electrons
Neutrons
Mass number
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Question # 3
The maximum no.of electrons that can be accommodated in M shell are
Choose an answer
2
8
18
32
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Question # 4
The value of Planck's constant is
Choose an answer
6.63 x 10-34 Js
6.63 x 10-32 Js
6.63 x 10-30 Js
6.63 x 10-28 Js
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Question # 5
Alpha particles are double charged.
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Negative
Positive
Can be both
Nil
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Question # 6
When U-235 breaks up, it produces?
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electrons
neutrons
protons
nothing
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Question # 7
The concept of orbit was used by:
Choose an answer
J.J Thomson
Rutherford
Bohr
Planck
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Question # 8
The boiling point of H2O is:
Choose an answer
100
12
1.105
9
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Question # 9
Which one of the following shell consists of three subshells?
Choose an answer
K- shell
M-Shell
L-shell
M-shell
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Question # 10
Atoms of elements combine chemically to form:
Choose an answer
Mixtures
compounds
solutions
ions
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Question # 11
L shell can accommodate ________________ electrons.
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2
8
18
32
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Question # 12
"Atoms" means _________
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Divisible
Indivisible
Break
Nil
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Question # 13
The lowest energy level is
Choose an answer
K
L
M
N
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Question # 14
Half life of C-14 ________________ years.
Choose an answer
5800
5700
5600
5500
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Question # 15
Canal rays are actually
Choose an answer
Electrons
Protons
Neutrons
X-rays
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Question # 16
Energy of a shell is ________________
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Variable
Constant
Cannot be changed
Nil
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Question # 17
________________ proposed that matter is composed of small particles.
Choose an answer
Greek
English's
Russian
Nil
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Question # 18
For diagnosis of goiter in thyroid gland we use
Choose an answer
Co-60
C-14
I-131
Sr-90
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