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Online Tests
ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers
Question # 1
X-rays produced in a tube operating at 10
5
V. The speed of X-rays produced is
Choose an answer
3 x 10
8
m/s
3.1 x 10
8
m/s
2.8 x 10
8
m/s
1.88 x 10
8
m/s
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Question # 2
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Choose an answer
one
two
three
four
five
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Question # 3
In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
Choose an answer
Small
Greater
Equal
Sometimes
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Question # 4
The lasing or active medium in He-Ne laser discharge tube is:
Choose an answer
Nitrogen
Helium
Hydrogen
Neon
None of these
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Question # 5
The He-Ne laser discharge tube is filled with:
Choose an answer
85% He
15% He
50% He
60% He
85% Ne
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Question # 6
X-rays can penetrate in a solid matte through a distance of several:
Choose an answer
Kilo metres
Metres
Centimeters
A few angstroms
One micrometer
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Question # 7
Lyman series in the spectrum of hydrogen exists in the :
Choose an answer
Infra-red region
Visible region
Ultraviolet region
Both(A) and (B)
None of these
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Question # 8
Ultraviolet region lies in ______ series
Choose an answer
Layman
Balmer
P fund
B racket
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Question # 9
Balmer series lies in that region of electromagnetic wave spectrum which is called:
Choose an answer
Visible region
Invisible region
Infra-red region
ultraviolet region
None of these
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Question # 10
Tick the series which lies in the visible region:
Choose an answer
Lyman series
Balmer series
Paschen series
Brackett series
P fund series
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Question # 11
In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is
Choose an answer
Helium
Neon
Both
None of these
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Question # 12
Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons
Choose an answer
Frequency
Penetrating power
Energy
Method of creation
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Question # 13
The electric field lines start from:
Choose an answer
Positive charge
Negative charge
Either A and B
Neutron
An atom
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Question # 14
If the distance between two charges is doubled,the force between them will become:
Choose an answer
Double
Half
One third
One fourth
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Question # 15
Graph of Black body radiation is example of
Choose an answer
Band spectra
Continuo's spectra
Line spectra
All
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