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ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers
Question # 1
We can excite an atom by
Choose an answer
Bombardment of particles
Radiating photons
Providing potential difference
All answer are true
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Question # 2
An compared to solid matter, a crack or an air bubble allows:
Choose an answer
Great amount of X-rays to pass
Smallast amount of X-rays to pass
Very samall amount of X-rays to pass
Any of these
None of these
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Question # 3
Graph of Black body radiation is example of
Choose an answer
Band spectra
Continuo's spectra
Line spectra
All
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Question # 4
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 # 5
Balmer series was identified in:
Choose an answer
1685
1785
1885
1985
1585
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Question # 6
Photons must have energy equal to
Choose an answer
ev
En
hf
None of these
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Question # 7
X-ray are also known as
Choose an answer
Roentgen rays
Maxwell rays
Plank range
Einstein rays
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Question # 8
By CAT scans, we can detect the density difference of the order of:
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1%
20%
30%
50%
70%
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Question # 9
Tick the series which lie/s in. the infra-red region.
Choose an answer
Pfund series
Brackett series
Paschen series
All of these
None of these
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Question # 10
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 # 11
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 # 12
The spectrum emitted from hydrogen filled discharge tube is:
Choose an answer
Line spectrum
Discrete spectrum
And spectrum
Absorption spectrum
Both (A) and (B)
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Question # 13
Gaussian surface is always:
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Rectangular
Spherical
Cylinder
Box shape
Any of these
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Question # 14
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 # 15
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 # 16
The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
Choose an answer
1.24 x 10
-10
m
7.92 x 10
-20
m
2.78 x 10
-14
m
3.88 x 10
-11
m
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Question # 17
Selenium is:
Choose an answer
An insulator
A conductor
Both A and B
Excellent conductor
None of these
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Question # 18
The results of spectra obtained by Balmer were expressed in 1896 by:
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Bohr
Rydberg
Planck
Rutherford
Coulomb
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Question # 19
Spectrum represents the number of component colours present in certain light in terms of:
Choose an answer
Wavelength
Frequency
Energy
Both (A) and (B)
All of these
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Question # 20
CT scanning is the abbreviated name of
Choose an answer
Computed Technology
Computed Technique
Computed Technology
Computerized Technique
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Question # 21
The process of formation of spectrum is called:
Choose an answer
Interference
Spectroscopy
Dispersion
Reflection
Botha (A) and (D)
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Question # 22
Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is
Choose an answer
Less than atmospheric pressure
Much less than atmospheric pressure
Greater than atmospheric pressure
Much greater than atmospheric pressure
Both C and D
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