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9th Class Chemistry Chapter 2 Structure of Atoms English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
Electron ________________ energy when they jump from low to higher level.
Choose an answer
Absorb
Radiate
Nothing
Nil
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Question # 2
L shell can accommodate ________________ electrons.
Choose an answer
2
8
18
32
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Question # 3
Who discovered the proton?
Choose an answer
Goldstein
J.J Thomson
Neil Bohr
Ruther Ford
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Question # 4
The boiling point of H2O is:
Choose an answer
100
12
1.105
9
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Question # 5
Half life of C-14 ________________ years.
Choose an answer
5800
5700
5600
5500
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Question # 6
________________ proposed that matter is composed of small particles.
Choose an answer
Greek
English's
Russian
Nil
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Question # 7
The isotopes C-12 is present in abundance of:
Choose an answer
96.6%
97.6%
99.7%
None of these
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Question # 8
Deuterium is used to make:
Choose an answer
light water
heavy water
soft water
hard water
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Question # 9
The no.of neutrons in deutrium is
Choose an answer
1
2
3
4
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Question # 10
Cathode rays are actually
Choose an answer
Electrons
Protons
Neutrons
Photons
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Question # 11
In ________________ Bohr considered hydrogen atom for his model .
Choose an answer
1913
1916
1917
1918
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Question # 12
When U-235 breaks up, it produces?
Choose an answer
electrons
neutrons
protons
nothing
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Question # 13
In isotopes numbers of ________________ is same.
Choose an answer
Protons
Electrons
Neutrons
Mass number
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