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Chemistry 9th Class English Medium Unit 2 Online Test MCQs With Answers
Question # 1
The value of Planck's constant is
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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 # 2
The concept of orbit was used by:
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J.J Thomson
Rutherford
Bohr
Planck
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Question # 3
Deuterium is used to make:
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light water
heavy water
soft water
hard water
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Question # 4
Electron ________________ energy when they jump from low to higher level.
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Absorb
Radiate
Nothing
Nil
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Question # 5
"Atoms" means _________
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Divisible
Indivisible
Break
Nil
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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
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 # 8
Who discovered the proton?
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Goldstein
J.J Thomson
Neil Bohr
Ruther Ford
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Question # 9
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 # 10
L shell can accommodate ________________ electrons.
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2
8
18
32
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Question # 11
Half life of C-14 ________________ years.
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5800
5700
5600
5500
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Question # 12
The number of isotopes of carbon are
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1
2
3
5
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Question # 13
Neuron was discovered by
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Sir Willium Crooks
Goldstein
James Chadwik
Neil Bohr
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