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Online Tests
ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers
Question # 1
The process of formation of spectrum is called:
Choose an answer
Interference
Spectroscopy
Dispersion
Reflection
Botha (A) and (D)
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Question # 2
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 # 3
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 # 4
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 # 5
Photons must have energy equal to
Choose an answer
ev
En
hf
None of these
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Question # 6
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 # 7
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 # 8
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 # 9
The holes created in the L and M shells are occupied by transitions of:
Choose an answer
Electrons from lower states
Electrons from higher state
Positrons from higher states
Electrons from K shell
Both (A) and (B)
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Question # 10
Graph of Black body radiation is example of
Choose an answer
Band spectra
Continuo's spectra
Line spectra
All
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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
The shell closer to the nucleus is called:
Choose an answer
N shell
L shell
K shell
M shell
O shell
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Question # 13
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 # 14
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 # 15
Balmer series was identified in:
Choose an answer
1685
1785
1885
1985
1585
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Question # 16
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 # 17
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 # 18
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 # 19
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 # 20
A metastable stae:
Choose an answer
Is an excited state
Is that in which excited electron is stable
Is that in which excited electron is usually unstable
Means a time interval of 10
-8
second
Both (A) and (C)
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Question # 21
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 # 22
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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