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Online Tests
Chemistry 9th Class English Medium Unit 2 Online Test MCQs With Answers
Question # 1
In 9th century scientist accepted by:
Choose an answer
Dalton
Bohars
Rutherford
Nil
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Question # 2
___________ is used in treatment of cancer.
Choose an answer
Cobalt-60
C-12
H-3
Nil
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Question # 3
The boiling point of H2O is:
Choose an answer
100
12
1.105
9
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Question # 4
When U-235 breaks up, it produces?
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electrons
neutrons
protons
nothing
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Question # 5
According to Bohr, electrons can revolve only in this orbits whose angular momentum is
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h/2π
n 2h/π
n h2/2π
n h/2π
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Question # 6
The lowest energy level is
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K
L
M
N
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Question # 7
Which one of the following shell consists of three subshells?
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K- shell
M-Shell
L-shell
M-shell
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Question # 8
Half life of C-14 ________________ years.
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5800
5700
5600
5500
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Question # 9
The isotopes C-12 is present in abundance of:
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96.6%
97.6%
99.7%
None of these
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Question # 10
First energy level is denoted by:
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K
L
M
N
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Question # 11
The isotopes of an element have different number of
Choose an answer
Electrons
Protons
Neutrons
Protons & Neutrons
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Question # 12
The p subshell has:
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one orbital
two orbitals
three orbitals
four orbitals
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Question # 13
In a discharge tube, the pressure of a gas is kept at
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10-2 atm
10-4 atm
10-6 atm
10-8 atm
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