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Online Tests
Chemistry 9th Class English Medium Unit 2 Online Test MCQs With Answers
Question # 1
Hydrogen has ________________ isotopes.
Choose an answer
1
2
3
4
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Question # 2
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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Question # 3
The concept of orbit was used by:
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J.J Thomson
Rutherford
Bohr
Planck
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Question # 4
Deuterium is used to make:
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light water
heavy water
soft water
hard water
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Question # 5
Who discovered the proton?
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Goldstein
J.J Thomson
Neil Bohr
Ruther Ford
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Question # 6
Alpha particles are double charged.
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Negative
Positive
Can be both
Nil
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Question # 7
Which of the following result in discovery of proton?
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cathode rays
canal rays
x-rays
alpha rays
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Question # 8
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 # 9
Atoms of elements combine chemically to form:
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Mixtures
compounds
solutions
ions
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Question # 10
Cathode rays are actually
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Electrons
Protons
Neutrons
Photons
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Question # 11
"Atoms" means _________
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Divisible
Indivisible
Break
Nil
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Question # 12
For diagnosis of goiter in thyroid gland we use
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Co-60
C-14
I-131
Sr-90
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Question # 13
The isotopes of an element have different number of
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Electrons
Protons
Neutrons
Protons & Neutrons
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Question # 14
Half life of C-14 ________________ years.
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5800
5700
5600
5500
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Question # 15
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 # 16
Which one of the following is the most penetrating?
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protons
electrons
neutrons
alpha paticles
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Question # 17
The number of isotopes of carbon are
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1
2
3
5
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Question # 18
The lowest energy level is
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K
L
M
N
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