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Online Tests
ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers
Question # 1
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 # 2
An compared to solid matter, a crack or an air bubble allows:
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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
Spectrum represents the number of component colours present in certain light in terms of:
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Wavelength
Frequency
Energy
Both (A) and (B)
All of these
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Question # 4
The shell closer to the nucleus is called:
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N shell
L shell
K shell
M shell
O shell
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Question # 5
Graph of Black body radiation is example of
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Band spectra
Continuo's spectra
Line spectra
All
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Question # 6
CT scanning is the abbreviated name of
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Computed Technology
Computed Technique
Computed Technology
Computerized Technique
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Question # 7
Braking radiation causes:
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Continuous spectrum
Line Spectrum
Band spectrum
Discrete specturm
All of these
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Question # 8
X-ray are also known as
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Roentgen rays
Maxwell rays
Plank range
Einstein rays
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Question # 9
Lyman series in the spectrum of hydrogen exists in the :
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Infra-red region
Visible region
Ultraviolet region
Both(A) and (B)
None of these
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Question # 10
The photocopying process is called:
Choose an answer
Geography
Sonography
Xerography
Zerography
None of these
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Question # 11
In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them
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Small
Greater
Equal
Sometimes
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Question # 12
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 # 13
Selenium is:
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An insulator
A conductor
Both A and B
Excellent conductor
None of these
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Question # 14
The lasing or active medium in He-Ne laser discharge tube is:
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Nitrogen
Helium
Hydrogen
Neon
None of these
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Question # 15
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
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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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Question # 16
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
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Frequency
Penetrating power
Energy
Method of creation
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Question # 17
The first series which was identified in the spectrum of hydrogen is called:
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Lyman series
Balmer series
Paschen series
Brackett series
Pfund series
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Question # 18
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
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Ultra red region
Visible region
Ultraviolet region
Any of these
None of these
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Question # 19
X-rays can penetrate in a solid matte through a distance of several:
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Kilo metres
Metres
Centimeters
A few angstroms
One micrometer
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Question # 20
The spectrum emitted from hydrogen filled discharge tube is:
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Line spectrum
Discrete spectrum
And spectrum
Absorption spectrum
Both (A) and (B)
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Question # 21
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 # 22
Coulomb multiplied by volt by volt gives the unit called:
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farad
Ohm
Second
joule
Watt
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