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Online Tests
Chemistry 9th Class English Medium Unit 2 Online Test MCQs With Answers
Question # 1
Neuron was discovered by
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Sir Willium Crooks
Goldstein
James Chadwik
Neil Bohr
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Question # 2
Energy of a shell is ________________
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Variable
Constant
Cannot be changed
Nil
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Question # 3
The maximum no.of electrons that can be accommodated in M shell are
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2
8
18
32
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Question # 4
Cathode rays are actually
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Electrons
Protons
Neutrons
Photons
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Question # 5
Hydrogen has ________________ isotopes.
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1
2
3
4
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Question # 6
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 # 7
The concept of orbit was used by:
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J.J Thomson
Rutherford
Bohr
Planck
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Question # 8
Atoms of elements combine chemically to form:
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Mixtures
compounds
solutions
ions
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Question # 9
In isotopes numbers of ________________ is same.
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Protons
Electrons
Neutrons
Mass number
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Question # 10
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 # 11
The lowest energy level is
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K
L
M
N
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Question # 12
In 9th century scientist accepted by:
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Dalton
Bohars
Rutherford
Nil
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