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Online Tests
ECAT Pre General Science Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers
Question # 1
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 # 2
The results of spectra obtained by Blamer were expressed in 1896 by
Choose an answer
Bohr
Rydberg
Planck
Rutherford
Coulomb
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Question # 3
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 # 4
The results of spectra obtained by Balmer were expressed in 1896 by:
Choose an answer
Bohr
Rydberg
Planck
Rutherford
Coulomb
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Question # 5
The natural arrangement of colours in the spectrum of white light spectrum is
Choose an answer
VIBGYOR
ROYBGIV
ROYBIGV
BIGROYV
None of these
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Question # 6
Braking radiation causes:
Choose an answer
Continuous spectrum
Line Spectrum
Band spectrum
Discrete specturm
All of these
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Question # 7
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 # 8
In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
Choose an answer
Short wavelength
Large wavelength
Very large wavelenth
Low frequency
Both (B) and (C)
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Question # 9
The first series which was identified in the spectrum of hydrogen is called:
Choose an answer
Lyman series
Balmer series
Paschen series
Brackett series
Pfund series
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Question # 10
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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Question # 11
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 # 12
Gaussian surface is always:
Choose an answer
Rectangular
Spherical
Cylinder
Box shape
Any of these
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Question # 13
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 # 14
By CAT scans, we can detect the density difference of the order of:
Choose an answer
1%
20%
30%
50%
70%
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Question # 15
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 # 16
Photons must have energy equal to
Choose an answer
ev
En
hf
None of these
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Question # 17
Graph of Black body radiation is example of
Choose an answer
Band spectra
Continuo's spectra
Line spectra
All
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Question # 18
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 # 19
The life time of metastable state is equal to
Choose an answer
Life time of excited state
Greater than by excited state
Zero
Less than by excited state
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Question # 20
The value of the metastable state for Neon is
Choose an answer
20.66eV
20.61eV
19.23eV
18.70eV
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Question # 21
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 # 22
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 # 23
The first shell near the neucles is
Choose an answer
L-shell
X-shell
N-shell
M-shell
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Question # 24
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 # 25
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
Choose an answer
Ultra red region
Visible region
Ultraviolet region
Any of these
None of these
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Question # 26
The photocopying process is called:
Choose an answer
Geography
Sonography
Xerography
Zerography
None of these
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Question # 27
Selenium is:
Choose an answer
An insulator
A conductor
Both A and B
Excellent conductor
None of these
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Question # 28
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 # 29
The range of wavelengths of colurs in the visible colours is
Choose an answer
140 nm to 456 nm
10 nm to 56 nm
410 nm to 656 nm
910 nm to 956 nm
None of these
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Question # 30
An electron of the hydrogen atom in the second orbit is called its:
Choose an answer
Ground state
Excited state
Ionized state
Any of these
None of these
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